CN103517183B - Method and device for strengthening subwoofer signals - Google Patents
Method and device for strengthening subwoofer signals Download PDFInfo
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- CN103517183B CN103517183B CN201210378978.2A CN201210378978A CN103517183B CN 103517183 B CN103517183 B CN 103517183B CN 201210378978 A CN201210378978 A CN 201210378978A CN 103517183 B CN103517183 B CN 103517183B
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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, the enhanced method and device of more particularly, to a kind of bass signal.
Background technology
Audio frequency is the important component part of multimedia equipment, the sound not had, better image, more matchmakers of many applications
Body equipment also imperfection.With the development of multimedia equipment, in consumer electronics product, especially hand-hold electronic equipments, flat
Plate TV, due to the restriction of volume and profile, speaker size-constrained cause harmonic frequency of loudspeakers higher it is impossible to radiation
Go out the component of signal less than its resonant frequency, lead to the disappearance of bass in audio-frequency unit.
The method that prior art realizes bass broadcasting includes: directly uses subwoofer audio amplifier, improves bass compensation and employing
Power back-off wave filter.Subwoofer audio amplifier power is low, relatively costly it is impossible to the handheld electronic being integrated into increasingly frivolous demand sets
In standby, flat panel TV；Improve bass compensation and using power back-off wave filter method efficiency low, distortion is larger, and effect is limited.
Therefore, accurate reproduction bass on small-medium size speaker cannot all be realized it is impossible to provide the enjoyment of requirements at the higher level to consumer.
Therefore, prior art has yet to be improved and developed.
Content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, the present invention is to solve prior art defect and deficiency, propose a kind of low
Sound Signal Enhanced Technology, to realize the broadcasting in small-medium size speaker baritone, is existed by the harmonic sequence of bass signal fundamental frequency
Reproduce common small-medium size speaker in human ear to be beyond one's reach low bass tones.
The technical scheme that present invention solution technical problem is adopted is as follows:
A kind of bass signal intensifier, for being filtered to left and right input channel signals processing to produce bass letter
Number export to speaker, this device includes low pass filter, harmonic wave generation module, band filter, harmonic controling module and anti-
Feedback module；The input of described low pass filter is electrically connected with left and right sound channels, outfan and the first of described harmonic wave generation module
Input electrically connects；The outfan of described harmonic wave generation module is electrically connected with the input of described band filter；Described band logical
The outfan of wave filter is electrically connected with the input of described harmonic controling module, the first input end of described feedback module；Described
The outfan of feedback module is electrically connected with the second input of described harmonic wave generation module；The first of described harmonic controling module is defeated
Go out end to be connected with the second input of described feedback module；After second outfan output Filtering Processing of described harmonic controling module
Bass signal to speaker.
Described harmonic controling module includes calculating loudness control module and the smothing filtering moulds such as harmonic envelope module, harmonic wave
Block, the input of described calculating harmonic envelope module is electrically connected with the outfan of described band filter, described calculating envelope mould
The outfan of block is electrically connected with the input of the loudness control modules such as described harmonic wave, the output of the loudness control module such as described harmonic wave
End electrically connects with the input of described smothing filtering module, the outfan of described smothing filtering module and described harmonic controling module
First and second outfan electrical connection.
Further, this device also includes left and right sound channels high pass filter, and input receives left and right input sound channel respectively
Signal；The bass that the outfan of left and right sound channels high pass filter is produced with the second outfan of described harmonic controling module respectively
Signal synthesis output comprises the acoustical signal of bass signal.
Described harmonic wave generation module to produce each harmonic signal using feedback multiplication loop.
Described low pass filter, high pass filter and band filter adopt infinite impulse response filter.
The present invention also provides a kind of bass signal enhanced method, is realized based on above-mentioned bass signal strengthening system, bag
Include following steps:
By described left and right input channel signals through synthesis after input low pass filter carry out low-pass filtering extract low frequency take a message
Number input harmonics generation module；
Each fundamental frequency signal that described harmonic wave generation module receives the low band signal of low pass filter produces each harmonic letter
Number feeding band filter；
Described band filter controls each harmonic signal of described harmonic wave generation module, controls higher hamonic wave signal and mutually
Adjust distortion, then by harmonic controling module described in each harmonic signal input and described feedback module；
Described harmonic controling module carries out harmonic amplitude control according to each harmonic signal that described band filter inputs
And the adjustment of each harmonic signal proportion, and bass signal is exported by the first outfan, and each by the second outfan output
Rd harmonic signal is to described feedback module；
Described feedback module closes according to each harmonic signal of described band filter and the input of described harmonic controling module
Described harmonic wave generation module is fed back to after one-tenth.
Further, described harmonic wave generation module to produce each harmonic signal using feedback multiplication loop.
Described harmonic controling module carries out harmonic amplitude control according to each harmonic signal that described band filter inputs
And the adjustment of each harmonic signal proportion is completed by loudness control modules such as described calculating harmonic envelope module harmonics.
In described harmonic controling module, harmonic amplitude control is carried out according to each harmonic signal that described band filter inputs
Also include by described smothing filtering module to each harmonic signal after adjustment after the adjustment of system and each harmonic signal proportion
Carry out smothing filtering and carry out gain control output bass signal.
Further, the inventive method arranges left and right sound channels high pass filter further and receives left and right input sound channel respectively
Signal carries out high-pass filtering and extracts output sound after high-frequency band signals are synthesized with the bass signal of described harmonic controling output respectively
Signal.
Compared with prior art, the enhanced method and device of bass signal of the present invention is according to the physiologic characteristic of human ear,
Extract the bass signal in left and right input sound channel, by harmonic wave generation module, band filter, harmonic controling module and feedback
Module produce bass signal fundamental frequency harmonic sequence, and this harmonic sequence is controlled higher hamonic wave, feedback harmonic signal to
Harmonic wave generation module carries out Automatic adjusument, finally reproduces middle-size and small-size speaker in human ear and is beyond one's reach drummy speech.This
Invention device adopts full Time Domain Processing, fixed-point calculation, and shared hardware resource is few, and the loudness control module such as harmonic wave adopts self adaptation q
Value calibration adjusts so that the bass signal of output avoids spilling and ensure that maximal accuracy, optimizes loudness and the control of figure
System, smothing filtering module carries out smothing filtering to the harmonic wave of adjustment, makes audio sound more naturally continuous.
Brief description
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 controling 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.
Specific embodiment
For making the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention further describes.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and without
In the restriction present invention.
As shown in figure 1, the invention provides a kind of bass signal strengthening system, for entering to left and right input channel signals
Row Filtering Processing is exported to speaker with producing bass signal, and this system includes low pass filter 10, harmonic wave generation module 20, band
Bandpass filter 30, harmonic controling module 40 and feedback module 50；Input 101 and the left and right input of described low pass filter 10
Sound channel electrically connects, and the input signal of left and right input sound channel inputs the defeated of low pass filter 10 after adder additional combining signal
Enter end 101, outfan 102 is electrically connected with the first input end 201 of described harmonic wave generation module 20；Described harmonic wave generation module 20
Outfan 202 electrically connect with the input 301 of described band filter 30；The outfan 302 of described band filter 30 with
The input 401 of described harmonic controling module 40, the first input end 501 of described feedback module 50 electrically connect；Described feedback mould
The outfan 503 of block 50 is electrically connected with the second input 203 of described harmonic wave generation module 20；Described harmonic controling module 40
First outfan 402 is connected with the second input 502 of described feedback module 50；Second output of described harmonic controling module 40
Bass signal after the output Filtering Processing of end 403 is to speaker.
From the point of view of in the lump with reference to Fig. 3, described harmonic controling module 40 includes calculating the loudness controls such as harmonic envelope module 41, harmonic wave
Molding block 42 and smooth filtration module 43, the described input calculating harmonic envelope module 41 and described harmonic controling module 40
Input 401 electrically connects, and the outfan of described calculating harmonic envelope module 41 is defeated with the loudness control modules 42 such as described harmonic wave
Enter end electrical connection, the outfan of the loudness control module such as described harmonic wave 42 is electrically connected with the input of described smothing filtering module 43
Connect, the outfan of described smothing filtering module 43 is electrically connected with the first outfan 402 of described harmonic controling module, put down meanwhile
Harmonic signal after the outfan the disposal of gentle filter of sliding filtration module 43 and described harmonic controling module input 401 input
After harmonic signal multiplication after described band filter process, the second outfan 403 through described harmonic controling module exports bass
Signal.
In order that apparatus of the present invention output bass signal, it is high with R channel that this device also includes L channel high pass filter 60
Bandpass filter 70, the input of left and right sound channels high pass filter receives left and right input channel signals respectively；Left and right sound channels high pass
The bass signal synthesis output that the outfan of wave filter is produced with second outfan 403 of described harmonic controling module respectively comprises
The acoustical signal of bass signal, specially will be defeated with L channel high pass filter 60 for bass signal that the second outfan 403 produces
The signal going out exports left output channels after adder additional combining signal, the bass signal that the second outfan 403 is produced
Export right output channels with the signal of R channel high pass filter 70 output after adder additional combining signal.
Specifically, described harmonic wave generation module 20 to produce each harmonic using feedback multiplication loop as shown in Figure 2
Signal, as shown in Fig. 2 the base of the low-frequency band being produced by low pass filter being inputted by the input 201 of harmonic wave generation module 20
Frequency signal f0, produces each harmonic signal sequence f0, the f2 of fundamental frequency signal f0, f3, f4 ... through harmonic wave generation module.According to
Feedback multiplication loop produces harmonic signal and belongs to prior art, will not be described here
In order to reduce the operand of wave filter, low pass filter in said apparatus, high pass filter and band filter
All using infinite impulse response filter (iir) structure, structure exponent number is little, and feasibility is high.
The enhanced method of bass signal of the present invention, is realized based on above-mentioned bass signal strengthening system, and it is specifically real
Existing step is as follows:
Step s100, by described left and right input channel signals, after synthesis, input low pass filter carries out low-pass filtering and carries
Take low band signal input harmonics generation module；
Step s200, each fundamental frequency signal that described harmonic wave generation module receives the low band signal of low pass filter produces respectively
Rd harmonic signal sends into band filter；Harmonic wave generation module produces each harmonic signal sequence and may be referred to Fig. 2, and this harmonic wave produces
Raw module to be realized using feedback circuit, by being produced by low pass filter of inputting of the input 201 of harmonic wave generation module 20
The fundamental frequency signal f0 of low-frequency band, through harmonic wave generation module produce fundamental frequency signal f0 each harmonic signal sequence f0, f2, f3,
f4…….For example, the fundamental frequency f0=50hz of input, then pass through each harmonic signal f0=that described harmonic wave generator produces
The each harmonic signal of 50hz, f2=100hz, f3=150hz, f4=200hz etc.；
Step s300, described band filter controls each harmonic signal of described harmonic wave generation module, controls high order humorous
Ripple signal and intermodulation distortion, then by harmonic controling module described in each harmonic signal input and described feedback module；Using band logical
The purpose of wave filter is to control unwanted higher hamonic wave signal in each harmonic signal, and band filter can be good at controlling
The number of times of harmonic wave processed, effectively reduces the energy expenditure of low frequency and the interference of higher hamonic wave signal.For example, for low-frequency cut-off frequency
The speaker of fc=200hz, the low frequency signal less than f0=50hz cannot play back, then need to be lifted the 4th, 5,6 times of f0 humorous
Ripple；And the low frequency signal for f0=80hz, then need to lift 3,4 subharmonic；For the low frequency signal of f0=100hz, then need
Lift the 2nd, 3 subharmonic；Fixing 2,3,4 subharmonic using lifting fundamental frequency compared to existing technology, can lead to the supper bass cannot
Get a promotion, and medium and low frequency is partly excessively lifted, the tone color of original bass is affected very big.The lifting of above overtone order needs
Low-frequency cut-off frequency according to speaker determining, when harmonic wave generation module produces each harmonic signal input band logical filter of low frequency
After ripple device, higher hamonic wave is controlled by band filter, to realize the control to overtone order；
Step s400, described harmonic controling module carries out harmonic wave according to each harmonic signal that described band filter inputs
Amplitude control and the adjustment of each harmonic signal proportion, and bass signal is exported by the first outfan, and export by second
End output each harmonic signal is to described feedback module；
Step s500, described feedback module according to described band filter and described harmonic controling module input each time humorous
Described harmonic wave generation module is fed back to after the synthesis of ripple signal.Feedback module and harmonic wave generation module collectively form feedback circuit, with
Harmonic signal is controlled.
Specifically, above-mentioned harmonic controling device carries out harmonic wave according to each harmonic signal that described band filter inputs
Amplitude controls and the adjustment of each harmonic signal proportion is to control mould by loudness such as described calculating harmonic envelope module harmonics
Block completes.Due to adopting fixed-point calculation, using fixed-point calculation distinct issues be precision reduction, general low frequency letter
Number value is less, processes bad bass audio and is difficult to out, and self-excitation easily.Solve this problem for more preferable, harmonic wave etc. rings
Degree control module adopts the calibration of self adaptation q value, according to harmonic envelope signal and the conversion that waits loudness match value, Automatic adjusument q
Value.The dynamic range ratio of the variable being controlled in loudness such as harmonic waves according to analysis, audio signal is larger, substantially in [0.001,160]
Between, for 16bit fixed-point number, then corresponding q value dynamic range, at [q15, q7], usually avoids spilling to take q=q7, but root
According to signal characteristic so that being greatly worth very little even zero, such subwoofer part may refrain from.But the internal number of analysis
According to computing feature, q value is adjusted according to signal adaptive so that output not only completely avoid spilling but also keeps essence to greatest extent
Spend, namely loudness and figure control obtain optimization.And make output result q primary system one because inside has division arithmetic.
After each harmonic signal is carried out with harmonic amplitude control and the adjustment of each harmonic signal proportion, also by described
Smothing filtering module carries out smothing filtering and carries out gain control output bass signal, so to each harmonic signal after adjustment
The audio that the bass signal of output produces can be made to sound more naturally continuous.
In order to by speaker export bass signal in addition it is also necessary to setting left and right sound channels high pass filter receive respectively left and right
Input channel signals carry out high-pass filtering and extract the bass signal conjunction respectively with the output of described harmonic controling module for the high-frequency band signals
Acoustical signal is exported after one-tenth.
The present invention can make to play the middle-size and small-size loudspeaker of bass contribution under the conditions of not increasing hardware cost
Bass audio is effectively lifted, and enables audience to get at the subwoofer of simple and honest broadness.This device hardware spending is smaller, Neng Gouding
Point realizes real-time audio effect processing.
It should be appreciated that the foregoing is only presently preferred embodiments of the present invention, it e insufficient to limit the present invention's
Technical scheme, for those of ordinary skills, within the spirit and principles in the present invention, can add according to the above description
To increase and decrease, to replace, to convert or to improve, and the technical scheme after all these increase and decrease, replacement, conversion or improvement, all should belong to this
The protection domain of invention claims.
Claims (10)
1. a kind of bass signal intensifier, for being filtered to left and right input channel signals processing to produce bass signal
Export to speaker it is characterised in that this device includes low pass filter, harmonic wave generation module, band filter, harmonic controling
Module and feedback module；The input of described low pass filter is electrically connected with left and right input sound channel, and outfan is produced with described harmonic wave
The first input end electrical connection of raw module；The outfan of described harmonic wave generation module and the input of described band filter are electrically connected
Connect；The input of the outfan of described band filter and described harmonic controling module, the first input end of described feedback module
Electrical connection；The outfan of described feedback module is electrically connected with the second input of described harmonic wave generation module；Described harmonic controling
First outfan of module is connected with the second input of described feedback module；Second outfan of described harmonic controling module is defeated
Go out the bass signal after Filtering Processing to speaker；
Described harmonic controling module carries out harmonic amplitude control and each according to each harmonic signal that described band filter inputs
The adjustment of rd harmonic signal ratio；Described feedback module according to described band filter and described harmonic controling module input each
Described harmonic wave generation module is fed back to after rd harmonic signal synthesis.
2. bass signal intensifier according to claim 1 is it is characterised in that described harmonic controling module includes calculating
The loudness control module such as harmonic envelope module, harmonic wave and smooth filtration module, the input of described calculating harmonic envelope module with
The outfan electrical connection of described band filter, the described outfan calculating envelope module and the loudness control modules such as described harmonic wave
Input electrical connection, the outfan of the loudness control module such as described harmonic wave is electrically connected with the input of described smothing filtering module
Connect, the outfan of described smothing filtering module is electrically connected with first and second outfan of described harmonic controling module.
3. bass signal intensifier according to claim 1 is it is characterised in that also include left and right sound channels high-pass filtering
Device, input receives left and right input channel signals respectively；The outfan of left and right sound channels high pass filter respectively with described harmonic wave
The acoustical signal that the bass signal synthesis output that second outfan of control module produces comprises bass signal.
4. the bass signal intensifier according to any one of claims 1 to 3 is it is characterised in that described harmonic wave produces mould
Block to produce each harmonic signal using feedback multiplication loop.
5. bass signal intensifier described in 4 is wanted it is characterised in that described low pass filter, high pass filter according to right
Adopt infinite impulse response filter with band filter.
6. a kind of enhanced method of bass signal Ji Yu described bass signal intensifier as arbitrary in claim 1 ~ 5, its
It is characterised by, comprise the steps:
By described left and right input channel signals through synthesis after input low pass filter carry out low-pass filtering extract low band signal defeated
Enter harmonic wave generation module；
Each fundamental frequency signal generation each harmonic signal that described harmonic wave generation module receives the low band signal of low pass filter send
Enter band filter；
Described band filter controls each harmonic signal of described harmonic wave generation module, controls higher hamonic wave signal and intermodulation abnormal
Become, then by harmonic controling module described in each harmonic signal input and described feedback module；
Described harmonic controling module carries out harmonic amplitude control and each according to each harmonic signal that described band filter inputs
The adjustment of rd harmonic signal ratio, and by first outfan export bass signal, and by second outfan export each time humorous
Ripple signal is to described feedback module；
Described harmonic controling module includes calculating loudness control module and the smooth filtration modules such as harmonic envelope module, harmonic wave；
After described feedback module is according to each harmonic signal synthesis of described band filter and the input of described harmonic controling module
Feed back to described harmonic wave generation module.
7. the enhanced method of bass signal according to claim 6 is it is characterised in that described harmonic wave generation module is using anti-
Present multiplication loop to produce each harmonic signal.
8. the enhanced method of bass signal according to claim 6 is it is characterised in that described harmonic controling module is according to institute
Stating each harmonic signal of band filter input, to carry out harmonic amplitude control and the adjustment of each harmonic signal proportion be to pass through
The loudness control modules such as described calculating harmonic envelope module harmonic complete.
9. the enhanced method of bass signal according to claim 6 it is characterised in that described harmonic controling module according to
The each harmonic signal of described band filter input is gone back after carrying out harmonic amplitude control and the adjustment of each harmonic signal proportion
Including by described smothing filtering module, each harmonic signal after adjustment is carried out by smothing filtering and carries out gain control output
Bass signal.
10. the enhanced method of bass signal according to claim 6 to 9 any one claim is it is characterised in that also wrap
Include following steps:
Setting left and right sound channels high pass filter receive respectively left and right input channel signals carry out high-pass filtering extract high frequency take a message
Number respectively export acoustical signal with after the bass signal synthesis of described harmonic controling module output.
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| CN105632509B (en) * | 2014-11-07 | 2019-07-19 | Tcl集团股份有限公司 | A kind of audio-frequency processing method and apparatus for processing audio |
| CN106558298A (en) * | 2015-09-29 | 2017-04-05 | 广州酷狗计算机科技有限公司 | A kind of audio analogy method and apparatus and system |
| CN105491478A (en) * | 2015-12-30 | 2016-04-13 | 东莞爱乐电子科技有限公司 | Subwoofer with volume being controlled by television sound envelope line |
| CN105677288B (en) * | 2015-12-30 | 2021-08-17 | 联想(北京)有限公司 | System and method for realizing simultaneous driving of internal and external audio output devices |
| CN107302740A (en) * | 2016-04-15 | 2017-10-27 | 美律电子(深圳)有限公司 | Have the sound source signal processing method and its device of the common cavity type back of the body case design speaker system of phase reversal attenuation characteristic |
| FR3052951B1 (en) * | 2016-06-20 | 2020-02-28 | Arkamys | METHOD AND SYSTEM FOR OPTIMIZING THE LOW FREQUENCY AUDIO RENDERING OF AN AUDIO SIGNAL |
| CN106101925B (en) * | 2016-06-27 | 2020-02-21 | 联想(北京)有限公司 | Control method and electronic equipment |
| US11477601B2 (en) | 2018-10-16 | 2022-10-18 | Dolby Laboratories Licensing Corporation | Methods and devices for bass management |
| CN115346542A (en) * | 2021-05-14 | 2022-11-15 | 广州视源电子科技股份有限公司 | Audio signal processing method, device and storage medium |
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