CN103581663A - Method and system for testing circuit board - Google Patents
Method and system for testing circuit board Download PDFInfo
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Abstract
The invention discloses a method and device for testing a circuit board. The circuit board is suitable for demodulating a received television signal to obtain an audio output signal and a video output signal. The testing method comprises the steps of sending a preset television signal to the circuit board, wherein the preset television signal is obtained by demodulating a preset image signal and a preset audio signal; testing the audio output signal output by the circuit board by the utilization of the preset audio signal; testing the video output signal output by the circuit board by the utilization of the preset image signal. By means of the technical scheme, automated testing is achieved, testing efficiency is improved, testing coverage is enlarged, and testing cost is lowered.
Description
Technical field
The present invention relates to technical field of measurement and test, relate in particular to a kind of method of testing and system of circuit board.
Background technology
Along with scientific and technological progress, increasing electronic product has possessed the function of playing simulated television or Digital Television.Such as: mobile phone, MP4, mobile unit, handheld device, palmtop PC etc.Electronic product passes through its built-in TV chip, as: digital television chip or simulated television chip carry out TV reception.In general, other chips of TV chip and electronic product (control chip, processor) can be integrated on a circuit board, take mobile phone as example, the digital television chip of mobile phone and its baseband chip are integrated on a circuit board conventionally, digital television chip is realized the demodulation to TV signal, and transfer to baseband chip to carry out follow-up processing the signal after demodulation, and as: the TV signal by baseband chip after to demodulation is decoded etc.
During electronic product batch production, in production scene, can test the function of electronic product or performance, whether the electronic product of being produced with checking reaches prospective quality requirement, also can find that the problem that exists in production process and product are in the defect of function, aspect of performance, as whether rosin joint, inefficacy etc. of chip simultaneously.The circuit board that is integrated with TV chip is no exception, also needs it to test.
In prior art, conventionally by following two kinds of modes, to being integrated with the circuit board of TV chip, test:
The first: television signal generator is connected with circuit-under-test plate by RF cable or wireless mode, and whether the data that the main control chip by computer by circuit-under-test plate reads in the interior related register of TV chip (simulated television chip or digital television chip) are normal in function aspects such as received television signal intensity, demodulates television signals to detect TV chip.Thereby whether the TV functions that judges circuit-under-test plate is normal.The performance that testing circuit board both can testing circuit board in this way also can testing circuit board function, and more accurate for the test of TV chip radio-frequency performance, whole test process can automatically complete under the control of computer.But television signal generator is expensive, cause testing cost too high, and adopt this method of testing cannot Accurate Determining TV chip with main control chip between be connected when the transmit image data signal whether correct.
The second: adopt manual type to test, particularly, by manual operation, as: button operation etc. allow, tested circuit board receives the TV signal that TV station sends, make circuit-under-test plate enter " televising " state, whether the TV functions of the mode artificial judgment circuit board by eye-observation image, people's ear listening is normal.Although adopt which to test, saved the required cost of configuration television signal generator, but while adopting manual testing, test coverage and testing efficiency is lower, test result is inaccurate on the one hand, on the other hand along with the increase of circuit board quantity to be tested, tester also needs corresponding increase, also can cause to a certain extent the increase of testing cost.
Therefore,, for being integrated with the circuit board of TV chip, how can provide that a kind of testing cost is low, testing efficiency and the high method of testing of coverage rate become one of current problem demanding prompt solution.
Other correlation techniques about TV chip can also be US2009190656A1 referring to publication number, and denomination of invention is the U.S. Patent application of TV chip (Television Functionality on a Chip).
Summary of the invention
The problem that the present invention solves is to provide method of testing and the system of a kind of testing efficiency and the circuit board that test coverage is high and testing cost is low.
In order to address the above problem, the invention provides a kind of method of testing of circuit board, the TV signal that described circuit board is suitable for receiving is carried out demodulation process, to obtain audio output signal and video output signals; Described method of testing comprises: send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal; Utilize described predetermined audio signal to test the audio output signal of described circuit board output; Utilize described predetermined image signal to test the video output signals of described circuit board output.
Optionally, describedly utilize described predetermined audio signal that the audio output signal of described circuit board output is tested and comprised: described audio output signal is converted into frequency domain by time domain; The energy of useful signal and the energy of noise signal in audio output signal described in frequency acquisition based on described predetermined audio signal; Calculate the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal; More described signal to noise ratio and default snr threshold.
Optionally, describedly utilize described predetermined image signal that the video output signals of described circuit board output is tested and comprised: to utilize the pixel parameter of described predetermined image signal to test described video output signals.
Optionally, the described pixel parameter of described predetermined image signal of utilizing is tested and is comprised described video output signals: the pixel parameter based on a two field picture in described video output signals is determined error parameter with pixel parameter corresponding in described predetermined image signal; More described error parameter and default error threshold.
Optionally, describedly utilize described predetermined image signal that the video output signals of described circuit board output is tested and comprised: to utilize the characteristic parameter of described predetermined image signal to test described video output signals.
Optionally, the described characteristic parameter of described predetermined image signal that utilizes is tested and is comprised described video output signals: adopt image recognition algorithm to identify word and/or the figure of a two field picture in described vision signal; The word that identifies of coupling and/or figure and word and/or figure corresponding in described predetermined image signal.
For addressing the above problem, the present invention also provides a kind of test macro of circuit board, and the TV signal that described circuit board is suitable for receiving is carried out demodulation process, to obtain audio output signal and video output signals; Described test macro comprises: transmitting element, and for sending scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal; Audio-frequency test unit, for utilizing described predetermined audio signal to test the audio output signal of described circuit board output; Video measurement unit, for utilizing described predetermined image signal to test the video output signals of described circuit board output.
Compared with prior art, technical scheme of the present invention has the following advantages:
Circuit board receives the scheduled television signal being obtained by predetermined image signal and the modulation of predetermined audio signal, and then to utilize described predetermined audio signal be that the audio output signal that known audio signal is exported after to predetermining circuit signal described in circuit board demodulation process is tested, utilizing described predetermined video signal is that the video output signals that known vision signal is exported after to predetermining circuit signal described in circuit board demodulation process is tested, to realize the test to the audio frequency and video function of circuit board.Due to without producing TV signal by television signal generator, therefore reduced to a great extent testing cost.And due to without come the function of decision circuitry plate whether normal by artificial mode, realized the test of automation, also improved testing efficiency and test coverage simultaneously.
While utilizing predetermined image signal to test the video output signals of circuit board output, both can carry out testing circuit board by the parameter error of comparison video image and predetermined image, again can by match video image and predetermined image feature circuit board is tested, improved the flexibility of test.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of method of testing of the circuit board of embodiment of the present invention;
Fig. 2 is the structural representation of test macro of the circuit board of embodiment of the present invention;
Fig. 3 is the schematic flow sheet of method of testing of the circuit board of the embodiment of the present invention one;
Fig. 4 is the structural representation of test macro of the circuit board of the embodiment of the present invention one;
Fig. 5 is the schematic flow sheet of method of testing of the circuit board of the embodiment of the present invention two;
Fig. 6 is the structural representation of test macro of the circuit board of the embodiment of the present invention two.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that.Therefore the present invention is not subject to the restriction of following public embodiment.
Just as described in the background art, while adopting existing method of testing Test integration to have the circuit board of TV chip, testing cost is high, and testing efficiency and test coverage are lower.Therefore, inventor considers, whether can not adopt television signal generator to produce predetermined TV signal to reduce testing cost, and utilize predetermined TV signal to test circuit board under test outgoing television signal, and then when realizing automatic test, improve testing efficiency and test coverage.
Refer to Fig. 1, the schematic flow sheet of the method for testing of the circuit board of embodiment of the present invention, in present embodiment, the TV signal that described circuit board is suitable for receiving is carried out demodulation process, to obtain audio output signal and video output signals; The method of testing of described circuit board comprises:
Step S11: send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal;
Step S12: utilize described predetermined audio signal to test the audio output signal of described circuit board output;
Step S13: utilize described predetermined image signal to test the video output signals of described circuit board output.
In present embodiment, described predetermined image signal has known parameter information, such as the pixel value of pixel in image, chromatic value, brightness value etc.; Described predetermined audio signal has known parameter information, such as the frequency of signal, energy (intensity) etc.Described predetermined image signal and predetermined audio signal can produce by electronic equipments such as VCD, DVD, computers.Described predetermined audio signal can be monophonic audio signal, can be also touch-tone signal; Described predetermined image signal can be still image signal, can be also dynamic image signal.Described predetermined image signal and predetermined audio signal be through TV signal transmitter, as: after TV signal transmitter modulation to obtain scheduled television signal and to be sent to circuit board to be measured.
Corresponding to the method for testing of the circuit board of embodiment of the present invention, embodiment of the present invention also provides a kind of test macro of circuit board, and the TV signal that described circuit board is suitable for receiving is carried out demodulation process, to obtain audio output signal and video output signals; The structural representation of the test macro of the circuit board of embodiment of the present invention shown in Figure 2, the test macro of described circuit board comprises:
Transmitting element 11, for sending scheduled television signal to described circuit board 10, described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal;
Audio-frequency test unit 12, for utilizing described predetermined audio signal to test the audio output signal of described circuit board 10 outputs;
In present embodiment, described circuit board 10 can be arranged in mobile terminal, also can be arranged in MP4, mobile unit, handheld device, palmtop PC etc.Described transmitting element 11, can communicate by wireless or wired mode between described circuit board 10 and described audio-frequency test unit 12, video measurement unit 13 by antenna sending and receiving TV signal with described circuit board 10.Described transmitting element 11 can comprise: audio-video signal source and TV signal transmitting apparatus, and described audio-video signal source can be DVD, VCD etc., described TV signal transmitting apparatus can be TV signal reflector.Circuit board 10 receives after the scheduled television signal of described transmitting element 11 transmissions, it is carried out to demodulation, decoding etc. and process with output audio output signal and video output signals.The audio output signal of 12 pairs of described audio-frequency test unit circuit board, 10 outputs is tested, and the video output signals of 13 pairs of video measurement unit circuit board, 10 outputs is tested.Described audio-frequency test unit 12, video measurement unit 13 can be integrated in computer.
For technical scheme of the present invention is described better, below by specific embodiment, the method for testing of the circuit board of technical solution of the present invention and test macro are described in detail.In following examples, the mobile terminal with TV functions of take is example (described circuit board is arranged in mobile terminal), and particularly, the described circuit board of take is integrated with TV chip and main control chip and illustrates accordingly as example.
Embodiment mono-
Refer to Fig. 3, the schematic flow sheet of the method for testing of the circuit board of the embodiment of the present invention one, wherein, step S121～step S124 correspondence the step S12 of Fig. 1, for the audio frequency processing capacity of testing circuit board; Step S131a～step S132a is the corresponding step S13 of Fig. 1, for the video processing function of testing circuit board.The test of audio frequency processing capacity and the test of video processing function can be carried out simultaneously.
First, execution step S111, sends scheduled television signal to described circuit board, and described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal; In the present embodiment, can pass through audio-video signal source, as DVD produces predetermined image signal and predetermined audio signal, and via TV signal transmitting apparatus, as being sent to circuit board under test after TV signal transmitter modulation.In order to reduce the complexity of test, in the present embodiment, described predetermined audio signal is monophonic audio signal, and described predetermined image signal is still image signal.
Circuit board to be measured receives described scheduled television signal, by integrated TV chip thereon, described scheduled television signal is carried out to demodulation, then by main control chip, carries out follow-up processing, isolates audio output signal and video output signals.Described main control chip comprises baseband chip.
Execution step S121, is converted into frequency domain by the audio output signal of described circuit board output by time domain.In the present embodiment, if the audio signal of circuit board under test output is simulated audio signal, described step S121 also comprises: the simulated audio signal of circuit board under test output is converted to digital audio and video signals, as: adopt analog to digital converter (ADC, Analog-to-Digital Converter), with by described simulated audio signal digitlization, the audio signal that is converted into frequency domain by time domain is digital audio and video signals.By analog signal figure, so that follow-up, can adopt Digital Signal Processing mode to realize test automation.
Audio output signal is converted into frequency domain by time domain, can first in time domain, to described digital audio and video signals, be multiplied by a window function, then by fast Fourier transform (FFT, Fast FourierTransformation), digital audio and video signals after windowing is converted into frequency domain, obtain frequency domain information, according to the method for signal processing, can reduce the frequency spectrum secondary lobe of signal as far as possible.
Then perform step S122, the energy of useful signal and the energy of noise signal in audio output signal described in the frequency acquisition based on described predetermined audio signal.Because the frequency of predetermined audio signal is known, therefore in the spectrogram of digital audio and video signals, the energy that the energy of getting the signal within the scope of the frequency main lobe of described predetermined audio signal is useful signal, the energy that the energy of getting the signal outside the frequency range of described predetermined audio signal is noise signal.
Then perform step S123, calculate the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal.Energy by the energy of useful signal divided by noise signal, obtains signal to noise ratio.
Then perform step S124, more described signal to noise ratio and default snr threshold.In general, if the normally functioning words of circuit board to be measured, the signal to noise ratio of the audio output signal of circuit board should be higher, for example, be greater than default snr threshold.In actual applications, default snr threshold can be set based on the actual application requirements, higher to the requirement of audio quality, and snr threshold can be set greatlyr, by the signal to noise ratio and the snr threshold that relatively calculate, to detect the audio frequency processing capacity of circuit board under test.In the present embodiment, described snr threshold is 10dB, when the signal to noise ratio of the audio output signal of circuit board under test output is more than or equal to 10dB, can think that the audio frequency processing capacity of circuit board under test is normal.
Execution step S131a: in the video output signals based on described circuit board output, the pixel parameter of a two field picture is determined error parameter with pixel parameter corresponding in described predetermined image signal; Then step S132a: more described error parameter and default error threshold, to detect the video processing function of circuit board under test.Wherein, a two field picture in video output signals can be any two field picture in video output signals, by computer, from video flowing (video output signals), captured a frame video image, the pixel parameter of this two field picture is compared with the pixel parameter of corresponding predetermined image, can be obtained error parameter.
Described pixel parameter comprises: at least one in the integrated value of the pixel value of pixel, the integrated value of pixel column and pixel column, accordingly, described error parameter comprises: at least one in pixel value maximum absolute error, pixel value mean square error, row integrated value maximum absolute error, row integrated value mean square error, row integrated value maximum absolute error and row integrated value mean square error; Accordingly, described error threshold comprises: at least one in pixel value maximum absolute error threshold value, pixel value mean square error threshold value, row integrated value maximum absolute error threshold value, row integrated value mean square error threshold value, row integrated value maximum absolute error threshold value and row integrated value mean square error threshold value.
The maximum of the pixel value that wherein, described pixel value maximum absolute error is the pixel of a two field picture in described vision signal and the pixel value absolute error of the corresponding pixel points in described predetermined image signal.
The mean value of the difference of the pixel value of the corresponding pixel points in the pixel value that described pixel value mean square error is the pixel of a two field picture in described vision signal and described predetermined image signal square.
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal.
The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the respective rows of pixels in described predetermined image signal.
The mean value of the difference of the row integrated value of the pixel column that described row integrated value mean square error is a two field picture in described vision signal and the integrated value of the respective rows of pixels in described predetermined image signal square.
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal.
The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the row of the respective pixel in described predetermined image signal.
The mean value of the difference of the integrated value of the row integrated value of the pixel column that described row integrated value mean square error is a two field picture in described vision signal and the respective pixel in described predetermined image signal row square.
Particularly, if described pixel parameter comprises the pixel value of pixel, error parameter comprises at least one in pixel value maximum absolute error and pixel value mean square error.For instance, in video output signals, the pixel value of each pixel of a two field picture is respectively: p
1, p
2, p
3..., p
n, in predetermined image, the pixel value of corresponding pixel is respectively: p
10, p
20, p
30..., p
n0, n is the sum of pixel in a two field picture, works as the absolute error of all pixels: | p
1– p
10|, | p
2– p
20|, | p
3– p
30| ..., | p
n– p
n0| in maximum while being less than pixel value maximum absolute error threshold value T1; Or, when pixel value mean square error: [(p
1– p
10)
2+ (p
2– p
20)
2+ (p
3– p
30)
2+ ... + (p
n– p
n0)
2when]/n is less than pixel value mean square error threshold value T2, can determine that the video processing function of circuit board under test is normal.Or, can be to be also less than pixel value maximum absolute error threshold value T1 and pixel value mean square error is less than pixel value mean square error threshold value T2 when pixel value maximum absolute error, determine that the video processing function of circuit board under test is normal.Wherein, described pixel value maximum absolute error threshold value, pixel value mean square error threshold value are determined by practical application and detection demand, and for example, the span of T1 can be that the span of 5 ~ 30, T2 can be 10 ~ 100.
If described pixel parameter comprises the integrated value of pixel column, error parameter comprises at least one in row integrated value maximum absolute error and row integrated value mean square error.For instance, in video output signals, the integrated value of each row pixel of a two field picture is respectively: I
1, I
2, I
3..., I
j, in predetermined image, the integrated value of respective rows of pixels is respectively: I
10, I
20, I
30..., I
j0, j is the line number of a two field picture, works as the absolute error of all pixel columns: | I
1– I
10|, | I
2– I
20|, | I
3– I
30| ..., | I
j– I
j0| in maximum while being less than row integrated value maximum absolute error threshold value T3; Or, when row integrated value mean square error: [(I
1– I
10)
2+ (I
2– I
20)
2+ (I
3– I
30)
2+ ... + (I
j– I
j0)
2when]/j is less than row integrated value mean square error threshold value T4, can determine that the video processing function of circuit board under test is normal.Or, can be to be also less than row integrated value maximum absolute error threshold value T3 and row integrated value mean square error is less than row integrated value mean square error threshold value T4 when row integrated value maximum absolute error, determine that the video processing function of circuit board under test is normal.Wherein, described row integrated value worst error threshold value, row integrated value mean square error threshold value are determined by practical application and detection demand, and for example, the span of T3 can be 5*M ~ 30*M, the span of T4 can be 10*M ~ 100*M, total number that wherein M is one-row pixels.
If described pixel parameter comprises the integrated value of pixel column, error parameter comprises at least one in row integrated value maximum absolute error and row integrated value mean square error.For instance, in video output signals, the integrated value of each row pixel of a two field picture is respectively: K
1, K
2, K
3..., K
m, in predetermined image, the integrated value of respective pixel row is respectively: K
10, K
20, K
30..., K
m0, m is the columns of a two field picture, works as the absolute error of all pixel columns: | K
1– K
10|, | K
2– K
20|, | K
3– K
30| ..., | K
m– K
m0| in maximum while being less than row integrated value maximum absolute error threshold value T5; Or, when row integrated value mean square error: [(K
1– I
10)
2+ (K
2– K
20)
2+ (K
3– K
30)
2+ ... + (K
m– K
m0)
2when]/m is less than row integrated value mean square error threshold value T6, can determine that the video processing function of circuit board under test is normal.Or, can be to be also less than row integrated value maximum absolute error threshold value T5 and row integrated value mean square error is less than row integrated value mean square error threshold value T6 when row integrated value maximum absolute error, determine that the video processing function of circuit board under test is normal.Wherein, described row integrated value maximum absolute error threshold value, row integrated value mean square error threshold value are determined by practical application and detection demand, and for example, the span of T5 can be 5*J ~ 30*J, the span of T6 can be 10*J ~ 100*J, and wherein J is total number of a row pixel.
By the audio output signal of step S121～S124 test circuit board under test output, the video output signals of step S131a～S132a test circuit board under test output, whether TV chip, the main control chip that can test on circuit board under test lost efficacy, whether the welding of TV chip, main control chip there is rosin joint, whether the connection between TV chip and main control chip has problems, and has also realized being integrated with the test of the circuit board of TV chip.
Corresponding to the method for testing of above-mentioned circuit board, the structure of the test macro of the circuit board of the present embodiment as shown in Figure 4, comprising: transmitting element 11, audio-frequency test unit 12, video measurement unit 13.Described transmitting element 11, audio-frequency test unit 12, video measurement unit 13 are all connected with circuit board 10.
Wherein, described transmitting element 11 comprises:
Audio-video signal source 110, for generation of predetermined image signal and predetermined audio signal;
TV signal transmitting apparatus 111, is connected with described audio-video signal source 110, for described predetermined image signal and predetermined audio signal are modulated to obtain scheduled television signal and be sent to described circuit board 10.
In the present embodiment, described audio-video signal source 110 can be DVD, VCD etc., and described TV signal transmitting apparatus 111 can be TV signal reflector.
Described audio-frequency test unit 12 comprises:
Converting unit 121, for being converted into frequency domain by described audio output signal by time domain;
Acquiring unit 122, is connected with described converting unit 121, for the energy of audio output signal useful signal described in the frequency acquisition based on described predetermined audio signal and the energy of noise signal;
The first comparing unit 124, calculates described signal to noise ratio and default snr threshold for more described computing unit 123.
In the present embodiment, if the audio signal of described circuit board output is simulated audio signal, described audio-frequency test unit 12 also comprises: AD conversion unit (not shown), for simulated audio signal described in digitlization to obtain digital audio and video signals; Described converting unit is for being converted into frequency domain by described digital audio and video signals by time domain.Described converting unit adopts FFT that described digital audio and video signals is converted into frequency domain.
In the present embodiment, described video measurement unit 13 utilizes the pixel parameter of described predetermined image signal to test the video output signals of described circuit board output.Particularly, described video measurement unit 13 comprises:
The second comparing unit 132a, for more described error parameter and default error threshold.
Optionally, described pixel parameter comprises: the pixel value of pixel; Described error parameter comprises: pixel value maximum absolute error; Described error threshold comprises: pixel value maximum absolute error threshold value; The maximum of the pixel value absolute error of the corresponding pixel points in the pixel value that described pixel value maximum absolute error is the pixel of a two field picture in described vision signal and described predetermined image signal.
Optionally, described pixel parameter comprises: the pixel value of pixel; Described error parameter comprises: pixel value mean square error; Described error threshold comprises: pixel value mean square error threshold value; Described pixel value is just all the mean value of the pixel value of pixel of a two field picture and the difference of the pixel value of the corresponding pixel points in described predetermined image signal square in vision signal described in error.
Optionally, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal; The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the respective rows of pixels in described predetermined image signal.
Optionally, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal; The mean value of the difference of the integrated value of the integrated value that described row integrated value mean square error is the pixel column of a two field picture in described vision signal and the respective rows of pixels in described predetermined image signal square.
Optionally, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal; The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the row of the respective pixel in described predetermined image signal.
Optionally, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal; The mean value of the difference of the integrated value of the integrated value that described row integrated value mean square error is the pixel column of a two field picture in described vision signal and the respective pixel in described predetermined image signal row square.
Below in conjunction with Fig. 4, the course of work of the test macro of the circuit board of the present embodiment is carried out to simple explanation.In the present embodiment, the audio-video signal source 110 of transmitting element 11, produce predetermined image signal and predetermined audio signal, TV signal transmitting apparatus 111 is sent to circuit board to be measured 10 by the scheduled television signal obtaining after described predetermined image signal and the modulation of predetermined audio signal.Circuit board 10 to be measured receives after scheduled television signal, and it is carried out to corresponding processing with acquisition audio output signal and video output signals.The signal to noise ratio of the frequency acquisition audio output signal of audio-frequency test unit 12 based on predetermined audio signal, judge whether described signal to noise ratio is greater than default snr threshold, if described signal to noise ratio is greater than snr threshold, the test of the Audio Signal Processing of circuit board to be measured is passed through.A frame video image in the video output signals of video measurement unit 13 crawl circuit board outputs, pixel parameter based on this video image is determined error parameter with the corresponding pixel parameter of predetermined image, judge whether described error parameter is less than default error threshold, if described error parameter is less than error threshold, the vision signal of circuit board to be measured is processed to test and is passed through.
Embodiment bis-
In the present embodiment, identical with embodiment mono-to the test of the audio output signal of circuit board output, different from embodiment mono-to the test of the video output signals of circuit board output.In the present embodiment, utilize described predetermined image signal test and comprise and utilize the video output signals that the characteristic parameter of described predetermined image signal is exported described circuit board to test the video output signals of described circuit board output.In addition, it should be noted that, in other embodiments, also can be in conjunction with the embodiments one and embodiment bis-, utilize pixel parameter and the characteristic parameter of predetermined image signal to test video output signals, with the video processing function of testing circuit board.
The schematic flow sheet of the method for testing of the circuit board of the embodiment of the present invention two shown in Figure 5, the method for testing of described circuit board comprises:
Step S111: send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal;
Step S121: the audio output signal of described circuit board output is converted into frequency domain by time domain;
Step S122: the energy of useful signal and the energy of noise signal in audio output signal described in the frequency acquisition based on described predetermined audio signal;
Step S123: calculate the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal;
Step S124: more described signal to noise ratio and default snr threshold;
Step S131b: adopt image recognition algorithm to identify word and/or the figure of a two field picture in described video output signals;
Step S132b: the word that identifies of coupling and/or figure and word and/or figure corresponding in described predetermined image signal.
In the present embodiment, step S121～step S124 correspondence the step S12 shown in Fig. 1, step S131b～step S132b is corresponding step S13 shown in Fig. 1.Below step S131b～step S132b is described in detail.
Execution step S131b, adopts image recognition algorithm to identify word and/or the figure of a two field picture in described video output signals.For the word in a two field picture, before word is identified, first need character area to extract, be exactly to carry out text detection and Text segmentation particularly, in the present embodiment, can adopt the existing detection algorithm based on edge, detection algorithm based on texture, detection algorithm based on region etc. detects word, adopt existing threshold method, method based on statistical model, without supervision clustering method etc., the word detecting is cut apart, then adopt optical character identification (OCR, Optical Character Recognition) technology is identified the word in the character area extracting.
For the figure in a two field picture, can adopt existing stencil matching algorithm, Bayesian Classification Arithmetic, the test pattern algorithm based on Hough transform etc. to identify the figure in image.
When reality is implemented, can identify the word in a two field picture, or identify the figure in a two field picture, or not only identify the word in a two field picture but also identified the figure of a two field picture.
Execution step S132b, the word that identifies of coupling and/or figure and word and/or figure corresponding in described predetermined image signal, namely, judge whether the word and/or the figure that identify mate with word and/or figure corresponding in predetermined image.Particularly, can adopt prior art, modes such as Gray-scale Matching, characteristic matching is mated with word, figure corresponding in described predetermined image signal the word of identifying in step S131b, figure, to determine whether word, the figure of the two field picture in the vision signal identifying conforms to word, the figure of corresponding two field picture in predetermined image signal.If conform to (coupling), the video processing function of circuit board under test is normal.
Accordingly, the structure of the test macro of the circuit board of the present embodiment as shown in Figure 6, comprising: transmitting element 11, audio-frequency test unit 12, video measurement unit 13 '.Described transmitting element 11, audio-frequency test unit 12, video measurement unit 13 ' be all connected with circuit board 10.
Wherein, similar in described transmitting element 11, audio-frequency test unit 12 and embodiment mono-, specifically can, referring to the description to it in embodiment mono-, repeat no more herein.
In the present embodiment, described video measurement unit 13 ' utilize the characteristic parameter of described predetermined image signal to test the video output signals of described circuit board output.Described video measurement unit 13 ' comprising: recognition unit 131b, for adopting image recognition algorithm to identify word and/or the figure of described video output signals one two field picture; Matching unit 132b, for mating word and/or figure word and/or the figure corresponding with described predetermined image signal identifying.
Below in conjunction with Fig. 6, the course of work of the test macro of the circuit board of the present embodiment is carried out to simple explanation.In the present embodiment, the audio-video signal source 110 of transmitting element 11, produce predetermined image signal and predetermined audio signal, TV signal transmitting apparatus 111 is sent to circuit board to be measured 10 by the scheduled television signal obtaining after described predetermined image signal and the modulation of predetermined audio signal.Circuit board 10 to be measured receives after scheduled television signal, and it is carried out to corresponding processing with acquisition audio output signal and video output signals.The signal to noise ratio of the frequency acquisition audio output signal of audio-frequency test unit 12 based on predetermined audio signal, judge whether described signal to noise ratio is greater than default snr threshold, if described signal to noise ratio is greater than snr threshold, the audio frequency of circuit board to be measured is processed to test and is passed through.A frame video image in the video output signals of video measurement unit 13 ' crawl circuit board output, word in this video image is mated with the specific character in predetermined image, figure in this video image is mated with the special pattern in predetermined image, judge and in video image, whether include specific character or the figure in predetermined image, if so, the test of the Video processing of circuit board to be measured is passed through.
To sum up, the method of testing of the circuit board that embodiment of the present invention provides and test macro have been realized the automatic test to circuit board, testing efficiency that circuit board is tested and test coverage and flexibility have been improved high, reduce testing cost, also reduced the difficulty of the test macro of realizing circuit board simultaneously.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible change and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.
Claims (30)
1. a method of testing for circuit board, the TV signal that described circuit board is suitable for receiving is carried out demodulation process, to obtain audio output signal and video output signals; It is characterized in that, comprising:
Send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal;
Utilize described predetermined audio signal to test the audio output signal of described circuit board output;
Utilize described predetermined image signal to test the video output signals of described circuit board output.
2. the method for testing of circuit board as claimed in claim 1, is characterized in that, the described audio output signal that utilizes described predetermined audio signal to export described circuit board is tested and comprised:
Described audio output signal is converted into frequency domain by time domain;
The energy of useful signal and the energy of noise signal in audio output signal described in frequency acquisition based on described predetermined audio signal;
Calculate the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal;
More described signal to noise ratio and default snr threshold.
3. the method for testing of circuit board as claimed in claim 2, it is characterized in that, the audio output signal of described circuit board output is simulated audio signal, and the described audio output signal that utilizes described predetermined audio signal to export described circuit board is also tested and comprised: simulated audio signal described in digitlization before described audio output signal is converted into frequency domain by time domain.
4. the method for testing of circuit board as claimed in claim 1, it is characterized in that, the described video output signals that utilizes described predetermined image signal to export described circuit board is tested and is comprised: utilize the pixel parameter of described predetermined image signal to test described video output signals.
5. the method for testing of circuit board as claimed in claim 4, is characterized in that, the described pixel parameter of described predetermined image signal of utilizing is tested and comprised described video output signals:
Pixel parameter based on a two field picture in described video output signals is determined error parameter with pixel parameter corresponding in described predetermined image signal;
More described error parameter and default error threshold.
6. the method for testing of circuit board as claimed in claim 5, is characterized in that, described pixel parameter comprises: the pixel value of pixel; Described error parameter comprises: pixel value maximum absolute error; Described error threshold comprises: pixel value maximum absolute error threshold value;
The maximum of the pixel value absolute error of the corresponding pixel points in the pixel value that described pixel value maximum absolute error is the pixel of a two field picture in described vision signal and described predetermined image signal.
7. the method for testing of circuit board as claimed in claim 5, is characterized in that, described pixel parameter comprises: the pixel value of pixel; Described error parameter comprises: pixel value mean square error; Described error threshold comprises: pixel value mean square error threshold value;
The mean value of the difference of the pixel value of the corresponding pixel points in the pixel value that described pixel value mean square error is the pixel of a two field picture in described vision signal and described predetermined image signal square.
8. the method for testing of circuit board as claimed in claim 5, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the respective rows of pixels in described predetermined image signal.
9. the method for testing of circuit board as claimed in claim 5, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
The mean value of the difference of the integrated value of the integrated value that described row integrated value mean square error is the pixel column of a two field picture in described vision signal and the respective rows of pixels in described predetermined image signal square.
10. the method for testing of circuit board as claimed in claim 5, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the row of the respective pixel in described predetermined image signal.
The method of testing of 11. circuit boards as claimed in claim 5, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
The mean value of the difference of the integrated value of the integrated value that described row integrated value mean square error is the pixel column of a two field picture in described vision signal and the respective pixel in described predetermined image signal row square.
The method of testing of 12. circuit boards as claimed in claim 1, it is characterized in that, the described video output signals that utilizes described predetermined image signal to export described circuit board is tested and is comprised: utilize the characteristic parameter of described predetermined image signal to test described video output signals.
The method of testing of 13. circuit boards as claimed in claim 12, is characterized in that, the described characteristic parameter of described predetermined image signal that utilizes is tested and comprised described video output signals:
Adopt image recognition algorithm to identify word and/or the figure of a two field picture in described video output signals;
The word that identifies of coupling and/or figure and word and/or figure corresponding in described predetermined image signal.
The method of testing of 14. circuit boards as claimed in claim 1, is characterized in that, described predetermined image signal is still image signal.
The method of testing of 15. circuit boards as claimed in claim 1, is characterized in that, described predetermined audio signal is monophonic audio signal.
The test macro of 16. 1 kinds of circuit boards, the TV signal that described circuit board is suitable for receiving is carried out demodulation process, to obtain audio output signal and video output signals; It is characterized in that, comprising:
Transmitting element, for sending scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and the modulation of predetermined audio signal;
Audio-frequency test unit, for utilizing described predetermined audio signal to test the audio output signal of described circuit board output;
Video measurement unit, for utilizing described predetermined image signal to test the video output signals of described circuit board output.
The test macro of 17. circuit boards as claimed in claim 16, is characterized in that, described audio-frequency test unit comprises:
Converting unit, for being converted into frequency domain by described audio output signal by time domain;
Acquiring unit, for the energy of audio output signal useful signal described in the frequency acquisition based on described predetermined audio signal and the energy of noise signal;
Computing unit, for calculating the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal;
The first comparing unit, for more described signal to noise ratio and default snr threshold.
The test macro of 18. circuit boards as claimed in claim 17, is characterized in that, the audio output signal of described circuit board output is simulated audio signal, and described audio-frequency test unit also comprises:
AD conversion unit, for simulated audio signal described in digitlization to obtain digital audio and video signals;
Described converting unit, for being converted into frequency domain by described digital audio and video signals by time domain.
The test macro of 19. circuit boards as claimed in claim 16, is characterized in that, the pixel parameter of predetermined image signal is tested described video output signals described in described video measurement unit by using.
The test macro of 20. circuit boards as claimed in claim 19, is characterized in that, described video measurement unit comprises:
Error determining unit, determines error parameter for the pixel parameter based on described video output signals one two field picture with pixel parameter corresponding in described predetermined image signal;
The second comparing unit, for more described error parameter and default error threshold.
The test macro of 21. circuit boards as claimed in claim 20, is characterized in that, described pixel parameter comprises: the pixel value of pixel; Described error parameter comprises: pixel value maximum absolute error; Described error threshold comprises: pixel value maximum absolute error threshold value;
The maximum of the pixel value absolute error of the corresponding pixel points in the pixel value that described pixel value maximum absolute error is the pixel of a two field picture in described vision signal and described predetermined image signal.
The test macro of 22. circuit boards as claimed in claim 20, is characterized in that, described pixel parameter comprises: the pixel value of pixel; Described error parameter comprises: pixel value mean square error; Described error threshold comprises: pixel value mean square error threshold value;
The mean value of the difference of the pixel value of the corresponding pixel points in the pixel value that described pixel value mean square error is the pixel of a two field picture in described vision signal and described predetermined image signal square.
The test macro of 23. circuit boards as claimed in claim 20, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the respective rows of pixels in described predetermined image signal.
The test macro of 24. circuit boards as claimed in claim 20, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
The mean value of the difference of the integrated value of the integrated value that described row integrated value mean square error is the pixel column of a two field picture in described vision signal and the respective rows of pixels in described predetermined image signal square.
The test macro of 25. circuit boards as claimed in claim 20, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
The maximum of the integrated value absolute error of the integrated value that described row integrated value maximum absolute error is the pixel column of a two field picture in described vision signal and the row of the respective pixel in described predetermined image signal.
The test macro of 26. circuit boards as claimed in claim 20, is characterized in that, described pixel parameter comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
The mean value of the difference of the integrated value of the integrated value that described row integrated value mean square error is the pixel column of a two field picture in described vision signal and the respective pixel in described predetermined image signal row square.
The test macro of 27. circuit boards as claimed in claim 16, is characterized in that, the characteristic parameter of predetermined image signal is tested described video output signals described in described video measurement unit by using.
The test macro of 28. circuit boards as claimed in claim 27, is characterized in that, described video measurement unit comprises:
Recognition unit, for adopting image recognition algorithm to identify word and/or the figure of described video output signals one two field picture;
Matching unit, for mating word and/or figure word and/or the figure corresponding with described predetermined image signal identifying.
The test macro of 29. circuit boards as claimed in claim 16, is characterized in that, described predetermined image letter is still image signal.
The test macro of 30. circuit boards as claimed in claim 16, is characterized in that, described predetermined audio letter is monophonic audio signal.
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Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: 2018990000163 Date of cancellation: 20210301 |
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Application publication date: 20140212 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinxin Finance Leasing (Xiamen) Co.,Ltd. Contract record no.: X2021110000010 Denomination of invention: Test method and system of circuit board Granted publication date: 20150729 License type: Exclusive License Record date: 20210317 |
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Effective date of registration: 20230713 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech park, Spreadtrum Center Building 1, Lane 2288 Patentee after: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Address before: 361012 unit 05, 8 / F, building D, Xiamen international shipping center, 97 Xiangyu Road, Xiamen area, China (Fujian) pilot Free Trade Zone, Xiamen City, Fujian Province Patentee before: Xinxin Finance Leasing (Xiamen) Co.,Ltd. |