CN101094421A - Method and device for detecting types of subcarrier of SECAM video signal - Google Patents
Method and device for detecting types of subcarrier of SECAM video signal Download PDFInfo
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Abstract
The method comprises: using FM ratio demodulation circuit to demodulate the current row-scan-line color sync signals; according to the demodulation result, getting the frequency of current row-scan-line color sync signals; getting the intermediate frequency between the subcarrier corresponding to the red color difference signal and the subcarrier corresponding to the blue color difference signal; comparing the frequency of current row-scan-line color sync signal with said intermediate frequency; according to the comparison result, determining the type of current row-scan-line subcarrier. The invention also reveals an apparatus thereof.
Description
Technical field
The present invention relates to TV technology, relate in particular to the detection method and the device of SECAM video signal subcarrier type.
Background technology
SECAM (S é quential Couleur a M é moire, order transmits colored and storage) standard is a kind of in the simulation color television system, be with the difference of other simulation color television system, transmit red color difference signal (R-Y) and blue difference signal (B-Y) line by line successively.Because the same time has only a kind of color difference signal to exist in transmission channel, therefore avoided color difference signal to go here and there the generation of phenomenon mutually.
Because red color difference signal (R-Y) and blue difference signal (B-Y) use the subcarrier of different frequency to carry out the FM modulation respectively, red color difference signal (R-Y) frequency of utilization is the subcarrier F of 440MHz
ORCarry out the FM modulation, blue difference signal (B-Y) frequency of utilization is the subcarrier F of 425MHz
OBCarry out the FM modulation, because each horizontal scanning line only transmits a kind of color difference signal, transmit red color difference signal (R-Y) and blue difference signal (B-Y) line by line successively again, therefore, the type of SECAM video signal subcarrier has two kinds: frequency is the subcarrier F of 440MHz
ORWith frequency be the subcarrier F of 425MHz
OB
Because each horizontal scanning line of normal video signal all includes red color difference signal (R-Y) and blue difference signal (B-Y), and in the Sequential Color and Memory system formula, red color difference signal (R-Y) and blue difference signal (B-Y) transmit line by line successively, therefore, receiving terminal is after receiving the line scan signals that transmits red color difference signal (R-Y) and blue difference signal (B-Y) line by line successively, if which kind of color difference signal what do not know the transmission of current line scan line is, then can't recover normal video signal.
Receiving terminal can adopt analog codec method or digital decoding method when decoding, determine the type of subcarrier during detection by the frequency that detects subcarrier.The quality of traditional analog codec method decoding is relatively poor relatively.Digital decoding method is compared with the analog codec method, has overcome analog circuit and can produce null offset, and the defective of hot benefit has reduced the distortion factor of signal to a certain extent, and signal is not subject to disturb during processing, has improved the quality of decoding relatively.The inventor is in realizing process of the present invention, complexity when the coding/decoding method of discovery prior art is realized is higher: because analog codec method and digital decoding method are determined the type of subcarrier by the frequency that detects subcarrier when detecting, therefore, the analog codec method needs complicated adjusting usually; Digital decoding method uses the Hilbert filter of CORDIC processor and differentiating stage to carry out the FM demodulation usually, and in demodulating process, utilizes the bias effect of hybrid frequency to discern the types of subcarrier of scan line, and complexity is also higher during realization.
Summary of the invention
The embodiment of the invention provides a kind of detection method and device of SECAM video signal subcarrier type, to solve prior art when detecting the types of subcarrier of SECAM vision signal, the complexity problem of higher.
The embodiment of the invention provides a kind of detection method of SECAM video signal subcarrier type, and the method comprising the steps of:
Utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtain the frequency of current line scan line burst signal according to demodulation result;
Obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence;
The frequency and the described intermediate frequency of current line scan line burst signal are compared;
Determine the type of current line scan line subcarrier according to comparative result.
In the said method, described demodulation result is meant: the instantaneous frequency of the current line scan line burst signal that demodulation obtains;
The frequency that obtains current line scan line burst signal according to demodulation result is meant: by calculating the mean value of current line scan line burst signal instantaneous frequency, obtain the frequency of current line scan line burst signal.
The type of determining current line scan line subcarrier according to comparative result comprises:
According to comparative result, during less than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of blue difference signal correspondence in the frequency of current line scan line burst signal;
During greater than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of red color difference signal correspondence in the frequency of current line scan line burst signal.
Determine after the type of current line scan line subcarrier, further comprise:, determine the type of each horizontal scanning line subcarrier in the piece image according to the rule of the type of current line scan line subcarrier, adjacent two horizontal scanning line types of subcarrier alternate between the types of subcarrier of the types of subcarrier of red color difference signal correspondence and blue difference signal correspondence.
The embodiment of the invention also provides a kind of checkout gear of SECAM video signal subcarrier type, comprising:
Demodulation module is used to utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtains the frequency of current line scan line burst signal according to demodulation result;
Acquisition module is used to obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence;
Comparison module is used for the frequency and the described intermediate frequency of current line scan line burst signal are compared;
First determination module is used for determining according to comparative result the type of current line scan line subcarrier.
In the said apparatus, described demodulation module comprises:
Demodulating unit is used to utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtains the instantaneous frequency of current line scan line burst signal;
Computing unit is used for obtaining the frequency of current line scan line burst signal by calculating the mean value of current line scan line burst signal instantaneous frequency.
Described first determination module comprises:
First determining unit is used for according to comparative result, and during less than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of blue difference signal correspondence in the frequency of current line scan line burst signal;
Second determining unit is used for according to comparative result, and during greater than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of red color difference signal correspondence in the frequency of current line scan line burst signal.
Described device also comprises:
Second determination module, the rule that is used for the type according to current line scan line subcarrier, adjacent two horizontal scanning line types of subcarrier alternate between the types of subcarrier of the types of subcarrier of red color difference signal correspondence and blue difference signal correspondence is determined the type of each horizontal scanning line subcarrier in the piece image.
In the embodiment of the invention, utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtain the frequency of current line scan line burst signal according to demodulation result, in addition, obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence again, compare by frequency and described intermediate frequency current line scan line burst signal, just can determine the type of current line scan line subcarrier according to comparative result, therefore when SECAM video signal subcarrier type is detected, greatly reduce the complexity of detection, simple during realization, have very strong practicality.
Description of drawings
Fig. 1 is the structural representation of FM demodulation circuit commonly used in the embodiment of the invention;
Fig. 2 is the structural representation of FM ratio demodulator circuit in the embodiment of the invention;
Fig. 3 is the process chart that detects SECAM video signal subcarrier type in the embodiment of the invention;
Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d are the structural representation of the checkout gear of SECAM video signal subcarrier type in the embodiment of the invention.
Embodiment
In the embodiment of the invention, utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtain the frequency of current line scan line burst signal according to demodulation result, and the intermediate frequency of the corresponding subcarrier of the subcarrier that this frequency is corresponding with the red color difference signal that obtains and blue difference signal compares, determine the type of current line scan line subcarrier according to comparative result, thereby reduce the complexity that detects.
Embodiment of the invention method is based on following consideration:
The SECAM vision signal is in when transmission, the subcarrier that each horizontal scanning line is corresponding a type, if a horizontal scanning line transmits red color difference signal (R-Y), and this horizontal scanning line respective frequencies subcarrier F that is 440MHz then
ORIf a horizontal scanning line transmits blue difference signal (B-Y), this horizontal scanning line respective frequencies subcarrier F that is 425MHz then
OB
The section start of each horizontal scanning line has all that one section subcarrier is unmodulated any color difference signal, modulates red color difference signal (R-Y) or blue difference signal (B-Y) on the subcarrier after this.This section is unmodulated to have the subcarrier of any color difference signal to be called burst signal (Color Burst).Can learn that burst signal is that frequency is the subcarrier F of 440MHz
OR, or frequency is the subcarrier F of 425MHz
OBBecause this subcarrier of two types is modulated red color difference signal (R-Y) and blue difference signal (B-Y) respectively, therefore, burst signal can be regarded as a row order identification signal, its function sends receiver to for the information of color difference signal which rubescent color difference signal of encoder and which are turned blue, so that can recover normal video signal when decoding.
This shows that embodiment of the invention method can be determined the types of subcarrier of SECAM vision signal by detecting the types of subcarrier of burst signal in the aberration modulation signal.
On the other hand, utilize FM ratio (FM Ratio) demodulator circuit can directly demodulate the instantaneous frequency of burst signal.FM ratio demodulator circuit is with the different of using always of FM demodulation circuit, can adopts rule of three directly to demodulate the instantaneous frequency of aberration modulation signal.
As shown in Figure 1, FM demodulation circuit commonly used utilizes the CORDIC processor to realize, earlier the SECAM vision signal is carried out light tone separating treatment (Y/C separation) during processing, from the SECAM vision signal, isolate aberration modulation signal and luminance signal, thereby make follow-up when handling, can only handle the interference of avoiding luminance signal that testing result is caused to the aberration modulation signal; And, according to the subcarrier of external circuit, the subcarrier of exporting is carried out 90 degree phase shifts handle the result of determination output respective type of current line scan line types of subcarrier; Further, subcarrier signal after the phase shift and the aberration modulation signal of exporting through the light tone separating treatment are multiplied each other; Utilize the CORDIC processor that the gained result that multiplies each other is handled at last, obtain color difference signal.
That is to say, when utilizing FM demodulation circuit commonly used to obtain color difference signal, need depend on the result of determination of external circuit, thereby this result of determination is handled the acquisition color difference signal the scan line types of subcarrier.
As shown in Figure 2, FM ratio demodulator circuit carries out light tone separating treatment (Y/C separation) to the SECAM vision signal earlier, from the SECAM vision signal, isolate aberration modulation signal and luminance signal, thereby make follow-up when handling, can only handle the interference of avoiding luminance signal that testing result is caused to the aberration modulation signal; After the aberration modulation signal is separated from the SECAM vision signal, send into two-way FIR filter respectively, to suppress the non-linear of FM modulation, use linear approximation to replace trigonometric function.Filtering result after two-way FIR filter process again through a divider obtaining its ratio, thereby the approximate instantaneous frequency f that obtains the aberration modulation signal
t
Because FM ratio demodulator circuit partly carries out demodulation to the burst signal of aberration modulation signal earlier, the part that the effective video signal section is promptly modulated color difference signal is carried out demodulation again, the instantaneous frequency of the burst signal that therefore, demodulates earlier promptly is the instantaneous frequency of current line scan line subcarrier.
In addition, because red color difference signal (R-Y) and blue difference signal correspond respectively to the subcarrier F that frequency is 440MHz
ORWith frequency be the subcarrier F of 425MHz
OB, the centre frequency f of this two classes subcarrier
0Value be (440MHz+425MHz)/2=432.5MHz; In the embodiment of the invention, the frequency of the current line scan line burst signal that consideration will obtain, the i.e. frequency of current line scan line subcarrier and centre frequency f
0Compare, obtain the type of current line scan line subcarrier according to comparative result.
As shown in Figure 2, the frequency of the current line scan line burst signal that the demodulation of FM ratio demodulator circuit is obtained is by a comparator and centre frequency f during enforcement
0Compare, comparative result is together sent into the decision circuit that Y/C separates with the line frequency signal, determine the type of current line scan line subcarrier according to comparative result.And then can select the corresponding subcarrier F of output by the type of selector according to current line scan line subcarrier
OROr F
OB, follow-up in the effective video stage of aberration modulation signal, utilize the instantaneous frequency f of frequency deviation arithmetic unit with the aberration modulation signal
tDeduct corresponding subcarrier frequency, and the processing of postemphasising, just can recover frequency difference, thereby obtain color difference signal.
This shows, FM ratio demodulator circuit need not to depend on external circuit to the result of determination of scan line types of subcarrier obtaining color difference signal, but can be directly frequency and intermediate frequency f by burst signal that demodulation is obtained
0Compare, and then the scan line types of subcarrier is judged.
As shown in Figure 3, among the embodiment, the handling process that detects SECAM video signal subcarrier type is as follows:
The intermediate frequency of the subcarrier of step 31, the subcarrier that obtains the red color difference signal correspondence and blue difference signal correspondence.
In step 30, utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, demodulation gained result comprises the instantaneous frequency of current line scan line burst signal, among the embodiment, can be directly with the instantaneous frequency of the current line scan line burst signal of demodulation gained frequency as current line scan line burst signal, carry out follow-up comparison process.Preferable, more accurate in order to make comparative result, the instantaneous frequency calculating mean value of the current line scan line burst signal that can obtain demodulation with the frequency of this mean value as current line scan line burst signal, carries out follow-up comparison process.
In step 31, obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence, promptly calculate F
ORAnd F
OBIntermediate frequency: f
0=(440MHz+425MHz)/2=432.5MHz.Certainly, step 31 also can be exchanged order with step 30, does not influence the concrete enforcement of the embodiment of the invention.
In step 32, the result that the frequency and the intermediate frequency of current line scan line burst signal compared comprises: the frequency of current line scan line burst signal is less than intermediate frequency; The frequency of current line scan line burst signal is greater than intermediate frequency.This be because, the frequency of current line scan line burst signal is the frequency of current line scan line subcarrier, has two kinds of value: 440MHz and 425MHz, corresponds respectively to red color difference signal and blue difference signal.
In step 33, the type of determining current line scan line subcarrier according to comparative result can comprise: according to comparative result, in the frequency of current line scan line burst signal during less than intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of blue difference signal correspondence, promptly at the frequency 425MHz＜f of current line scan line burst signal
0In the time of (432.5MHz), the type that can determine current line scan line subcarrier is F
OBDuring greater than intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of red color difference signal correspondence in the frequency of current line scan line burst signal, promptly at the frequency 440MHz MHz＞f of current line scan line burst signal
0In the time of (432.5MHz), the type that can determine current line scan line subcarrier is F
OR
On the other hand, the SECAM vision signal is in when transmission, the subcarrier that each horizontal scanning line is corresponding a type, and promptly respective frequencies is the subcarrier F of 440MHz
OR, or frequency is the subcarrier F of 425MHz
OB, and the types of subcarrier of every adjacent two horizontal scanning lines is at F
ORAnd F
OBBetween alternate.For example, have in modulation during the effective scanning line of vision signal, if a horizontal scanning line transmits red color difference signal (R-Y), this horizontal scanning line respective frequencies subcarrier F that is 440MHz then
ORAnd another adjacent with it horizontal scanning line transmits blue difference signal (B-Y), and respective frequencies is the subcarrier F of 425MHz
OB
After the type that detects current line scan line subcarrier, further, can be according to the type of current line scan line subcarrier, adjacent two horizontal scanning line types of subcarrier types of subcarrier F in the red color difference signal correspondence
ORTypes of subcarrier F with the blue difference signal correspondence
OBBetween the rule of alternate, determine the types of subcarrier of each horizontal scanning line in the piece image.
Certainly, if the burst signal of each horizontal scanning line in the piece image is carried out demodulation, and then obtain the frequency and the intermediate frequency f of each horizontal scanning line burst signal
0Compare, determine the type of each horizontal scanning line subcarrier can obtain result more accurately according to comparative result.
Based on same inventive concept, the embodiment of the invention also provides a kind of checkout gear of SECAM video signal subcarrier type, shown in Fig. 4 a, comprising: demodulation module 40, acquisition module 41, comparison module 42, first determination module 43; Wherein, demodulation module 40 is used to utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtains the frequency of current line scan line burst signal according to demodulation result; Acquisition module 41 is used to obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence; Comparison module 42 is used for the frequency and the intermediate frequency of current line scan line burst signal are compared; First determination module 43 is used for determining according to comparative result the type of current line scan line subcarrier.
Among the embodiment, shown in Fig. 4 b, in the checkout gear shown in Fig. 4 a, demodulation module 40 can comprise: demodulating unit 400, computing unit 401; Wherein, demodulating unit 400 is used to utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtains the instantaneous frequency of current line scan line burst signal; Computing unit 401 is used to calculate the mean value of current line scan line burst signal instantaneous frequency, obtains the frequency of current line scan line burst signal.
Among the embodiment, shown in Fig. 4 c, in the checkout gear shown in Fig. 4 a, first determination module 43 comprises: first determining unit 430, second determining unit 431; Wherein, first determining unit 430 is used for according to comparative result, and during less than intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of blue difference signal correspondence in the frequency of current line scan line burst signal; Second determining unit 431 is used for according to comparative result, and during greater than intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of red color difference signal correspondence in the frequency of current line scan line burst signal.
Among the embodiment, shown in Fig. 4 d, checkout gear shown in Fig. 4 a can also comprise: second determination module 44, the rule that is used for the type according to current line scan line subcarrier, adjacent two horizontal scanning line types of subcarrier alternate between the types of subcarrier of the types of subcarrier of red color difference signal correspondence and blue difference signal correspondence is determined the type of each horizontal scanning line subcarrier in the piece image.
One of ordinary skill in the art will appreciate that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
In the embodiment of the invention, utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtain the frequency of current line scan line burst signal according to demodulation result, in addition, obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence again, compare by frequency and intermediate frequency current line scan line burst signal, just can determine the type of current line scan line subcarrier according to comparative result, therefore when SECAM video signal subcarrier type is detected, greatly reduce the complexity of detection, simple during realization, have very strong practicality.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1, a kind of detection method of SECAM video signal subcarrier type is characterized in that the method comprising the steps of:
Utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtain the frequency of current line scan line burst signal according to demodulation result;
Obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence;
The frequency and the described intermediate frequency of current line scan line burst signal are compared;
Determine the type of current line scan line subcarrier according to comparative result.
2, the method for claim 1 is characterized in that, described demodulation result is meant: the instantaneous frequency of the current line scan line burst signal that demodulation obtains;
The frequency that obtains current line scan line burst signal according to demodulation result is meant: by calculating the mean value of current line scan line burst signal instantaneous frequency, obtain the frequency of current line scan line burst signal.
3, the method for claim 1 is characterized in that, determines that according to comparative result the type of current line scan line subcarrier comprises:
According to comparative result, during less than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of blue difference signal correspondence in the frequency of current line scan line burst signal;
During greater than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of red color difference signal correspondence in the frequency of current line scan line burst signal.
4, as claim 1,2 or 3 described methods, it is characterized in that, determine after the type of current line scan line subcarrier, further comprise:, determine the type of each horizontal scanning line subcarrier in the piece image according to the rule of the type of current line scan line subcarrier, adjacent two horizontal scanning line types of subcarrier alternate between the types of subcarrier of the types of subcarrier of red color difference signal correspondence and blue difference signal correspondence.
5, a kind of checkout gear of SECAM video signal subcarrier type is characterized in that, comprising:
Demodulation module is used to utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtains the frequency of current line scan line burst signal according to demodulation result;
Acquisition module is used to obtain the intermediate frequency of the subcarrier of the subcarrier of red color difference signal correspondence and blue difference signal correspondence;
Comparison module is used for the frequency and the described intermediate frequency of current line scan line burst signal are compared;
First determination module is used for determining according to comparative result the type of current line scan line subcarrier.
6, device as claimed in claim 5 is characterized in that, described demodulation module comprises:
Demodulating unit is used to utilize FM ratio demodulator circuit that current line scan line burst signal is carried out demodulation, obtains the instantaneous frequency of current line scan line burst signal;
Computing unit is used for obtaining the frequency of current line scan line burst signal by calculating the mean value of current line scan line burst signal instantaneous frequency.
7, device as claimed in claim 5 is characterized in that, described first determination module comprises:
First determining unit is used for according to comparative result, and during less than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of blue difference signal correspondence in the frequency of current line scan line burst signal;
Second determining unit is used for according to comparative result, and during greater than described intermediate frequency, the type of determining current line scan line subcarrier is the types of subcarrier of red color difference signal correspondence in the frequency of current line scan line burst signal.
8, as claim 5,6 or 7 described devices, it is characterized in that described device also comprises:
Second determination module, the rule that is used for the type according to current line scan line subcarrier, adjacent two horizontal scanning line types of subcarrier alternate between the types of subcarrier of the types of subcarrier of red color difference signal correspondence and blue difference signal correspondence is determined the type of each horizontal scanning line subcarrier in the piece image.
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| CN 200710119706 CN101094421A (en) | 2007-07-30 | 2007-07-30 | Method and device for detecting types of subcarrier of SECAM video signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223503A (en) * | 2010-04-13 | 2011-10-19 | 新港传播媒介公司 | SECAM line identification and PAL switch |
| CN102655601A (en) * | 2011-03-01 | 2012-09-05 | 深圳艾科创新微电子有限公司 | SECAM (Sequential Colour and Memory) system detection method and device |
-
2007
- 2007-07-30 CN CN 200710119706 patent/CN101094421A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223503A (en) * | 2010-04-13 | 2011-10-19 | 新港传播媒介公司 | SECAM line identification and PAL switch |
| CN102223503B (en) * | 2010-04-13 | 2013-07-31 | 新港传播媒介公司 | SECAM line identification and PAL switch |
| CN102655601A (en) * | 2011-03-01 | 2012-09-05 | 深圳艾科创新微电子有限公司 | SECAM (Sequential Colour and Memory) system detection method and device |
| CN102655601B (en) * | 2011-03-01 | 2015-11-25 | 深圳艾科创新微电子有限公司 | A kind of Sequential Color and Memory system formula detection method and device |
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