CN103517183A - Method and device for strengthening subwoofer signals - Google Patents
Method and device for strengthening subwoofer signals Download PDFInfo
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Abstract
The invention discloses a method and device for strengthening subwoofer signals. Left input sound track signals and right input sound track signals are combined and then input into a low-pass filter for low-pass filtering, low-frequency-band signals are extracted and input into a harmonic generation module, the generated harmonic signals of each time are fed into a band-pass filter to be controlled, then the harmonic signals of each time are input into a harmonic signal control module to be subjected to harmonic amplitude control and regulation of the ratio of the harmonic signals of each time, the subwoofer signals are output through a first output end, the harmonic signals of each time are output through a second output end and output to the harmonic generation module through a feedback module, and generation of the harmonic signals of each time is controlled in a self-adaptation mode. The method and device for the strengthening subwoofer signals adopt full-time-domain processing and fixed-point calculation, and occupies a few hardware resources, a loudness control module for harmonic signals and the like adopts self-adaptation Q-value calibration adjustment, the output subwoofer signals avoid overflowing, and the maximum accuracy of the output subwoofer signals is guaranteed. The control over the loudness and the sound type is optimized, a smoothing filtering module carries out smoothing filtering on the adjusted harmonic signals, and therefore the sound effect sounds more natural and continuous.
Description
Technical field
The present invention relates to Audio Signal Processing technology, relate in particular to method and device that a kind of bass signal strengthens.
Background technology
Audio frequency is the important component part of multimedia equipment, the sound not had, better image, more also imperfection of the multimedia equipment of many application.Development along with multimedia equipment, in consumer electronics product, especially hand-hold electronic equipments, panel TV, restriction due to volume and profile, the size-constrained harmonic frequency of loudspeakers that caused of loud speaker is higher, cannot give off the signal component lower than its resonance frequency, cause the disappearance of bass in audio-frequency unit.
The method that existing techniques in realizing bass is play comprises: directly use subwoofer audio amplifier, improve bass compensation and adopt power back-off filter.Subwoofer audio amplifier power is low, and cost is higher, cannot be integrated in the hand-hold electronic equipments, panel TV of day by day frivolous demand; Improve bass compensation and adopt the method efficiency of power back-off filter low, distortion is larger, and effect is limited.Therefore, all cannot realize accurate reduction bass on small-medium size loud speaker, the enjoyment of requirements at the higher level can not be provided to consumer.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the present invention is for solving prior art defect and deficiency, propose a kind of bass signal enhancing technology and realize the broadcasting in small-medium size loud speaker baritone, the harmonic sequence by bass signal fundamental frequency reproduces the common small-medium size loud speaker bass tone that is beyond one's reach in people's ear.
The technical scheme that technical solution problem of the present invention adopts is as follows:
An intensifier, exports loud speaker for left and right input channel signals being carried out to filtering processing to produce bass signal, and this device comprises low pass filter, harmonic wave generation module, band pass filter, harmonic wave control module and feedback module; The input of described low pass filter is electrically connected to left and right sound channels, and output is electrically connected to the first input end of described harmonic wave generation module; The output of described harmonic wave generation module is electrically connected to the input of described band pass filter; The output of described band pass filter is electrically connected to the input of described harmonic wave control module, the first input end of described feedback module; The output of described feedback module is electrically connected to the second input of described harmonic wave generation module; The first output of described harmonic wave control module is connected with the second input of described feedback module; Bass signal after the second output output filtering of described harmonic wave control module is processed is to loud speaker.
Described harmonic wave control module comprises loudness control modules such as calculating harmonic wave envelope module, harmonic wave and level and smooth filtration module, the input of described calculating harmonic wave envelope module is electrically connected to the output of described band pass filter, the output of described calculating envelope module is electrically connected to the input of the loudness control modules such as described harmonic wave, the output of the loudness control modules such as described harmonic wave is electrically connected to the input of described smothing filtering module, and the output of described smothing filtering module is electrically connected to first and second output of described harmonic wave control module.
Further, this device also comprises left and right sound channels high pass filter, and input receives respectively left and right input channel signals; The synthetic output packet of bass signal that the output of left and right sound channels high pass filter produces with the second output of described harmonic wave control module is respectively containing the voice signal of bass signal.
Described harmonic wave generation module adopts feedback multiplication loop to produce each harmonic signal.
Described low pass filter, high pass filter and band pass filter adopt infinite impulse response filter.
A kind of method that the present invention also provides bass signal to strengthen, realizes based on above-mentioned bass signal enhancing system, comprises the steps:
Described left and right input channel signals is inputted after synthetic to low pass filter and carried out low-pass filtering extraction low band signal input harmonics generation module;
Described harmonic wave generation module receives each fundamental frequency signal generation each harmonic signal of the low band signal of low pass filter and sends into band pass filter;
Described band pass filter is controlled the each harmonic signal of described harmonic wave generation module, controls high order harmonic component signal and intermodulation distortion, then each harmonic signal is inputted to described harmonic wave control module and described feedback module;
Described harmonic wave control module is carried out the adjustment of harmonic amplitude control and each harmonic signal proportion according to the each harmonic signal of described band pass filter input, and by the first output output bass signal, and export each harmonic signal to described feedback module by the second output;
After described feedback module is synthetic according to the each harmonic signal of described band pass filter and the input of described harmonic wave control module, feed back to described harmonic wave generation module.
Further, described harmonic wave generation module adopts feedback multiplication loop to produce each harmonic signal.
The adjustment that described harmonic wave control module is carried out harmonic amplitude control and each harmonic signal proportion according to the each harmonic signal of described band pass filter input completes by loudness control modules such as described calculating harmonic wave envelope module and harmonic waves.
In described harmonic wave control module, according to the each harmonic signal of described band pass filter input, carry out also comprising and by described smothing filtering module, the each harmonic signal after adjusting being carried out to smothing filtering and carry out gain control system output bass signal after the adjustment of harmonic amplitude control and each harmonic signal proportion.
Further, the inventive method further arrange left and right sound channels high pass filter receive respectively left and right input channel signals carry out high-pass filtering extract high-frequency band signals respectively with described harmonic wave control the bass signal of output synthetic after output sound signal.
Compared with prior art, the method that bass signal of the present invention strengthens and device are according to the physiologic characteristic of people's ear, extract the bass signal in left and right input sound channel, by harmonic wave generation module, band pass filter, harmonic wave control module and feedback module, produce the harmonic sequence of bass signal fundamental frequency, and to this harmonic sequence control high order harmonic component, feedback harmonic signal carries out self adaptation adjusting to harmonic wave generation module, finally in people's ear, reproduces the middle-size and small-size loud speaker drummy speech that is beyond one's reach.Apparatus of the present invention adopt the processing of full-time territory, fixed-point calculation, shared hardware resource is few, the loudness control modules such as harmonic wave adopt the calibration of self adaptation Q value to regulate, make the bass signal of output avoid overflowing and having guaranteed maximal accuracy, optimized the control of loudness and figure, smothing filtering module is carried out smothing filtering to the harmonic wave of adjusting, and makes audio sound more naturally continuous.
Accompanying drawing explanation
Fig. 1 is the structural principle block diagram of bass signal intensifier of the present invention.
Fig. 2 is the structure principle chart of harmonic wave generation module in bass signal intensifier of the present invention.
Fig. 3 is the structure principle chart of harmonic wave control module in bass signal intensifier of the present invention.
Fig. 4 is the main flow chart of bass signal Enhancement Method of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, the invention provides a kind of bass signal and strengthen system, for left and right input channel signals being carried out to filtering processing, to produce bass signal, export loud speaker to, this system comprises low pass filter 10, harmonic wave generation module 20, band pass filter 30, harmonic wave control module 40 and feedback module 50; The input 101 of described low pass filter 10 is electrically connected to left and right input sound channel, the input signal of left and right input sound channel is inputted the input 101 of low pass filter 10 after adder is added composite signal, and output 102 is electrically connected to the first input end 201 of described harmonic wave generation module 20; The output 202 of described harmonic wave generation module 20 is electrically connected to the input 301 of described band pass filter 30; The output 302 of described band pass filter 30 is electrically connected to the first input end 501 of the input 401 of described harmonic wave control module 40, described feedback module 50; The output 503 of described feedback module 50 is electrically connected to the second input 203 of described harmonic wave generation module 20; The first output 402 of described harmonic wave control module 40 is connected with the second input 502 of described feedback module 50; Bass signal after the second output 403 output filterings of described harmonic wave control module 40 are processed is to loud speaker.
In the lump in conjunction with Fig. 3, described harmonic wave control module 40 comprises calculates harmonic wave envelope module 41, the loudness control modules such as harmonic wave 42 and level and smooth filtration module 43, the input of described calculating harmonic wave envelope module 41 is electrically connected to the input 401 of described harmonic wave control module 40, the output of described calculating harmonic wave envelope module 41 is electrically connected to the input of the loudness control modules 42 such as described harmonic wave, the output of the loudness control modules 42 such as described harmonic wave is electrically connected to the input of described smothing filtering module 43, the output of described smothing filtering module 43 is electrically connected to the first output 402 of described harmonic wave control module, simultaneously, harmonic signal after the described band pass filter of the harmonic signal after the output the disposal of gentle filter of smothing filtering module 43 and 401 inputs of described harmonic wave control module input is processed multiplies each other by the second output 403 output bass signals of described harmonic wave control module.
In order to make apparatus of the present invention output bass signal, this device also comprises L channel high pass filter 60 and R channel high pass filter 70, and the input of left and right sound channels high pass filter receives respectively left and right input channel signals; The synthetic output packet of bass signal that the output of left and right sound channels high pass filter produces with the second output 403 of described harmonic wave control module is respectively containing the voice signal of bass signal, be specially the signal of the bass signal of the second output 403 generations and 60 outputs of L channel high pass filter is outputed to left output channels after adder is added composite signal, the bass signal that the second output 403 is produced and the signal of R channel high pass filter 70 outputs output to right output channels after adder addition composite signal.
Particularly, described harmonic wave generation module 20 adopts feedback multiplication loop as shown in Figure 2 to produce each harmonic signal, as shown in Figure 2, the fundamental frequency signal f0 of the low-frequency band being produced by low pass filter of being inputted by the input 201 of harmonic wave generation module 20, through harmonic wave generation module, produce the each harmonic burst f0 of fundamental frequency signal f0, f2, f3, f4 ...According to feedback multiplication loop, produce harmonic signal and belong to prior art, be not repeated herein
In order to reduce the operand of filter, the low pass filter in said apparatus, high pass filter and band pass filter all adopt infinite impulse response filter (IIR) structure, and structure exponent number is little, and feasibility is high.
The method that bass signal of the present invention strengthens, realizes based on above-mentioned bass signal enhancing system, and its specific implementation step is as follows:
Step S100 inputs described left and right input channel signals low pass filter and carries out low-pass filtering extraction low band signal input harmonics generation module after synthetic;
Step S200, described harmonic wave generation module receives each fundamental frequency signal generation each harmonic signal of the low band signal of low pass filter and sends into band pass filter; Harmonic wave generation module produces each harmonic burst can be with reference to figure 2, this harmonic wave generation module adopts feedback loop to realize, the fundamental frequency signal f0 of the low-frequency band being produced by low pass filter of being inputted by the input 201 of harmonic wave generation module 20, through harmonic wave generation module, produce the each harmonic burst f0 of fundamental frequency signal f0, f2, f3, f4 ...For example, the fundamental frequency f0=50Hz of input, the each harmonic signal f0=50Hz producing by described humorous wave generation device, f2=100Hz, f3=150Hz, the each harmonic signal of f4=200Hz etc.;
Step S300, described band pass filter is controlled the each harmonic signal of described harmonic wave generation module, controls high order harmonic component signal and intermodulation distortion, then each harmonic signal is inputted to described harmonic wave control module and described feedback module; Adopt the object of band pass filter to be to control unwanted high order harmonic component signal in each harmonic signal, band pass filter can be good at controlling the number of times of harmonic wave, effectively reduces the energy consumption of low frequency and the interference of high order harmonic component signal.For example, for the loud speaker of low-frequency cut-off frequency fc=200Hz, cannot playback lower than the low frequency signal of f0=50Hz, need to promote the 4th, 5,6 subharmonic of f0; And for the low frequency signal of f0=80Hz, need to promote 3,4 subharmonic; For the low frequency signal of f0=100Hz, need to promote the 2nd, 3 subharmonic; Fixing 2,3,4 subharmonic that promote fundamental frequency that adopt, can cause supper bass to get a promotion, and medium and low frequency part excessively promote compared to existing technology, very large on the tone color impact of original bass.The lifting of above harmonic number need to be determined according to the low-frequency cut-off frequency of loud speaker, when harmonic wave generation module produces after the each harmonic signal input tape bandpass filter of low frequency, by band pass filter, controls high order harmonic component, realizes the control to harmonic number;
Step S400, described harmonic wave control module is carried out the adjustment of harmonic amplitude control and each harmonic signal proportion according to the each harmonic signal of described band pass filter input, and by the first output output bass signal, and export each harmonic signal to described feedback module by the second output;
Step S500, feeds back to described harmonic wave generation module after described feedback module is synthetic according to the each harmonic signal of described band pass filter and the input of described harmonic wave control module.Feedback module and harmonic wave generation module form feedback loop jointly, so that harmonic signal is controlled.
Particularly, the adjustment that above-mentioned harmonic wave control device carries out harmonic amplitude control and each harmonic signal proportion according to the each harmonic signal of described band pass filter input completes by loudness control modules such as described calculating harmonic wave envelope module and harmonic waves.Owing to adopting fixed-point calculation, adopt a reduction that distinct issues are precision of fixed-point calculation, general low frequency signal value is less, processes bad bass audio and is difficult to out, and easily occur self-excitation.For better addressing this problem, the loudness control module such as harmonic wave adopts the calibration of self adaptation Q value, according to harmonic wave envelope signal and etc. the conversion of loudness match value, self adaptation adjusting Q value.According to analysis, the dynamic range of the variable that audio signal is controlled in loudness such as harmonic waves is larger, roughly between [0.001,160], for 16bit fixed-point number, corresponding Q value dynamic range is at [Q15, Q7], be generally to avoid overflowing and get Q=Q7, but according to signal characteristic, making a big chunk value very little has been even zero, and subwoofer part has just suppressed like this.But analyzing internal data computing feature, according to signal adaptive, adjust Q value, make output not only avoid completely overflowing but also keeping to greatest extent precision, is also that loudness and figure control obtain optimization.And because existing division arithmetic, inside makes Output rusults Q primary system one.
By each harmonic signal being carried out after harmonic amplitude control and the adjustment of each harmonic signal proportion, also by described smothing filtering module, the each harmonic signal after adjusting carried out to smothing filtering and carry out gain control system output bass signal, can make like this audio of the bass signal generation of output sound more naturally continuous.
In order to export bass signal by loud speaker, also need to arrange left and right sound channels high pass filter receive respectively left and right input channel signals carry out high-pass filtering extract high-frequency band signals synthetic with the bass signal of described harmonic wave control module output respectively after output sound signal.
The present invention can not increase under hardware cost condition, and the bass audio that makes to play the middle-size and small-size loudspeaker of bass composition is effectively promoted, and makes audience can get at the subwoofer of simple and honest broadness.This device hardware spending is smaller, can process by the real-time audio of fixed-point implementation.
Should be understood that; the foregoing is only preferred embodiment of the present invention; be not sufficient to limit technical scheme of the present invention; for those of ordinary skills; within the spirit and principles in the present invention; can be increased and decreased according to the above description, replaced, converted or be improved, and all these increases and decreases, replace, conversion or improve after technical scheme, all should belong to the protection range of claims of the present invention.
Claims (10)
1. a bass signal intensifier, for left and right input channel signals being carried out to filtering processing, to produce bass signal, export loud speaker to, it is characterized in that, this device comprises low pass filter, harmonic wave generation module, band pass filter, harmonic wave control module and feedback module; The input of described low pass filter is electrically connected to left and right input sound channel, and output is electrically connected to the first input end of described harmonic wave generation module; The output of described harmonic wave generation module is electrically connected to the input of described band pass filter; The output of described band pass filter is electrically connected to the input of described harmonic wave control module, the first input end of described feedback module; The output of described feedback module is electrically connected to the second input of described harmonic wave generation module; The first output of described harmonic wave control module is connected with the second input of described feedback module; Bass signal after the second output output filtering of described harmonic wave control module is processed is to loud speaker.
2. bass signal intensifier according to claim 1, it is characterized in that, described harmonic wave control module comprises calculates harmonic wave envelope module, the loudness control modules such as harmonic wave and level and smooth filtration module, the input of described calculating harmonic wave envelope module is electrically connected to the output of described band pass filter, the output of described calculating envelope module is electrically connected to the input of the loudness control modules such as described harmonic wave, the output of the loudness control modules such as described harmonic wave is electrically connected to the input of described smothing filtering module, first of the output of described smothing filtering module and described harmonic wave control module, two outputs are electrically connected to.
3. bass signal intensifier according to claim 1, is characterized in that, also comprises left and right sound channels high pass filter, and input receives respectively left and right input channel signals; The synthetic output packet of bass signal that the output of left and right sound channels high pass filter produces with the second output of described harmonic wave control module is respectively containing the voice signal of bass signal.
4. according to the bass signal intensifier described in claims 1 to 3 any one, it is characterized in that, described harmonic wave generation module adopts feedback multiplication loop to produce each harmonic signal.
5. according to right, want the bass signal intensifier described in 4, it is characterized in that, described low pass filter, high pass filter and band pass filter adopt infinite impulse response filter.
6. the method that bass signal strengthens, is characterized in that, comprises the steps:
Described left and right input channel signals is inputted after synthetic to low pass filter and carried out low-pass filtering extraction low band signal input harmonics generation module;
Described harmonic wave generation module receives each fundamental frequency signal generation each harmonic signal of the low band signal of low pass filter and sends into band pass filter;
Described band pass filter is controlled the each harmonic signal of described harmonic wave generation module, controls high order harmonic component signal and intermodulation distortion, then each harmonic signal is inputted to described harmonic wave control module and described feedback module;
Described harmonic wave control module is carried out the adjustment of harmonic amplitude control and each harmonic signal proportion according to the each harmonic signal of described band pass filter input, and by the first output output bass signal, and export each harmonic signal to described feedback module by the second output;
After described feedback module is synthetic according to the each harmonic signal of described band pass filter and the input of described harmonic wave control module, feed back to described harmonic wave generation module.
7. the method that bass signal according to claim 6 strengthens, is characterized in that, described harmonic wave generation module adopts feedback multiplication loop to produce each harmonic signal.
8. the method that bass signal according to claim 6 strengthens, it is characterized in that, the adjustment that described harmonic wave control module is carried out harmonic amplitude control and each harmonic signal proportion according to the each harmonic signal of described band pass filter input completes by loudness control modules such as described calculating harmonic wave envelope module and harmonic waves.
9. the method that bass signal according to claim 8 strengthens, it is characterized in that, in described harmonic wave control module, according to the each harmonic signal of described band pass filter input, carry out also comprising and by described smothing filtering module, the each harmonic signal after adjusting being carried out to smothing filtering and carry out gain control system output bass signal after the adjustment of harmonic amplitude control and each harmonic signal proportion.
10. the method strengthening according to the bass signal described in claim 6 to 9 any one claim, is characterized in that, also comprises the steps:
Arrange left and right sound channels high pass filter receive respectively left and right input channel signals carry out high-pass filtering extract high-frequency band signals synthetic with the bass signal of described harmonic wave control module output respectively after output sound signal.
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