CN105357624B - Loudspeaker replaying double-track signal processing method, device and system - Google Patents
Loudspeaker replaying double-track signal processing method, device and system Download PDFInfo
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- CN105357624B CN105357624B CN201510812091.3A CN201510812091A CN105357624B CN 105357624 B CN105357624 B CN 105357624B CN 201510812091 A CN201510812091 A CN 201510812091A CN 105357624 B CN105357624 B CN 105357624B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
Abstract
The invention provides a loudspeaker replaying double-track signal processing method, a device and a system and belongs to the sound processing technology field. The double-track signal processing method comprises steps that, a crosstalk elimination step, recursion feedback processing on an inputted stereo sound signal is carried out to eliminate crosstalk transmitted from a different-side loudspeaker, and a tone quality reduction step, tone quality reduction processing on the signal after crosstalk elimination processing is carried out to restore change on tone quality after the crosstalk elimination step. The double-track signal processing device comprises a crosstalk elimination unit used for carrying out crosstalk elimination processing on the sound signal and a tone quality reduction unit used for carrying out tone quality reduction for the sound signal, and the double-track signal processing system is constructed by the double-track signal processing device. Through the method, the device and the system, the stereo sound signal after being processed is replayed in a double-track player, crosstalk interference elimination and tone quality reduction for loss caused by crosstalk elimination processing can be effectively realized, an effective hearing zone can be expanded, and the sound space sense is enhanced.
Description
Technical field
The present invention relates to Audio Signal Processing technical field, specifically, it is related to what a kind of two loudspeaker speaker stereo was reset
Binaural signal processing method, apparatus and system.
Background technology
In the acoustic image of stereo or virtual particular orientation of being reset using twin loudspeaker, we always expect that left ear is only hearing
The sound that left speaker is played, auris dextra is only hearing the sound that right loudspeaker is played.However, can there is institute when playing in twin loudspeaker
" string sound " problem of meaning, i.e., left ear can hear the sound that left speaker is played, and the sound that right loudspeaker is played can be heard again, instead
It is as the same.This presence for intersecting string sound so that acoustic image is limited between two-loudspeaker, has a strong impact on the acoustic image of playback sound
The degree of accuracy.
In order that the sound that left speaker is broadcasted can only be heard by left ear, the sound that right loudspeaker is played can only be listened by auris dextra
Arrive, string sound cancellation element need to be introduced in the stereophonic reproducing system of twin loudspeaker, for the influence of the string sound that eliminates or decay, energy
Acoustic image orientation is effectively corrected, to strengthen the space multistory sense of sound.
Notification number is eliminated between two loudspeakers and audience's ears to disclose one kind in the patent document of CN1942017A
The device of cross-talk, i.e. binaural signal processing unit, it includes the first signal processing unit and secondary signal processing unit.First
Signal processing unit is used for the sound channel signal of cross-mixing first, second with first, second sound channel adjusted by gain and time delay
Signal.Secondary signal processing unit includes the first filter cell and the second filter cell；First filter cell is head phase
The inverse form of propagation function HRTF is closed, for adjusting the frequency of the signal of the first adder unit mixing in the first signal processing unit
Rate characteristic；Second filter cell is an inverse form of associated propagation function HRTF, in adjusting the first signal processing unit
The frequency characteristic of the signal of the second adder unit mixing.
Although the processing method of the string sound cancellation element is simplified to traditional string sound removing method, passed related to head
Broadcast function（HRTF）The convolution number of times of inverse form is reduced to 2 times by 4 times, but also relies on an associated propagation function (HRTF）,
HRTF be in space a certain sound to left-right ear impulse response function, after have selected HRTF, loudspeaker and auditor's phase
It is consistent with selected HRTF to position, greatly limit the scope of effective listening zone.Also, the fortune of left and right acoustic channels and inverse HRTF convolution
Calculation amount is larger, it is necessary to do convolution twice compared with macrooperation, the amount of calculation for causing entirely string sound to eliminate process remains unchanged not small.
The content of the invention
The main object of the present invention is to provide a kind of tone color for effectively eliminating string acoustic jamming and improving output acoustical signal
The binaural signal processing method of speaker playback；
It is a further object of the present invention to provide a kind of tone color for effectively eliminating string acoustic jamming and improving output acoustical signal
The binaural signal processing unit of speaker playback；
Another object of the present invention is to provide more than one speaker playbacks for stating binaural signal processing unit structure
Binaural signal processing system.
In order to realize above-mentioned main purpose, the binaural signal processing method of the speaker playback that the present invention is provided includes string
Sound removal process and tone color reduction step, tone color is carried out by tone color reduction step to the acoustical signal processed through string sound removal process
Reduction.String sound removal process includes that the elimination of string sound is carried out to left channel input signal obtains the first left channel signals, and to right sound
Road input signal carries out the elimination of string sound and obtains the first right-channel signals；Wherein, the string sound of left channel input signal is eliminated be by
First right-channel signals time delay and the first cross talk cancellation signal is obtained with predetermined gain decay, and subtracted from left channel input signal
First cross talk cancellation signal obtains the first left channel signals；String sound elimination to right channel input signal is by the first L channel letter
Number time delay and the second cross talk cancellation signal is obtained with predetermined gain decay, subtracting the second string sound from right channel input signal eliminates letter
Number obtain the first right-channel signals.
From above scheme, the elimination of recursive feedback formula string sound is carried out to acoustical signal in string sound removal process, it is not
Depend on an associated propagation function（HRTF）, compared with prior art, the robustness to listener location is more preferable, effective audition model
Enclose bigger.And any convolution algorithm need not be done so that the method amount of calculation is more much smaller than the amount of calculation of prior art.
Specific scheme is that tone color reduction step is included entering the first left channel signals line delay and decayed with predetermined gain
The first tone color recovering signal is obtained, subtracting the first tone color recovering signal from the first left channel signals obtains the second left channel signals；
Energy to the predetermined frequency band signal in the second left channel signals carries out lifting treatment, obtains left channel output signal；And to
One right-channel signals enter line delay and obtain the second tone color recovering signal with predetermined gain decay, are subtracted from the first right-channel signals
Second tone color recovering signal obtains the second right-channel signals；Energy to the predetermined frequency band signal in the second right-channel signals is carried out
Lifting is processed, and obtains right channel output signal.Lifted by the time delay in tone color reduction step, decay and frequency band energy, to entering
Row tone color is reduced, and the loss for causing acoustical signal tone color is eliminated to supplement string sound.
One more specifically scheme is in string sound removal process, to the first left channel signals and the first right-channel signals
Delay time is equal；In tone color reduction step, the delay time to the first left channel signals and the first right-channel signals is string
The twice of delay time in sound removal process.Due to the delay time in tone color reduction step be string sound removal process in time delay when
Between twice, make to form the frequency response curve opposite with string sound removal process in tone color reduction step, and then elimination string sound
The tone color that removal process is brought changes, to reach the effect of tone color reduction.
Another more specifically scheme is in string sound removal process, to the first left channel signals and the first right-channel signals
Fading gain it is equal；In tone color reduction step, to the fading gain phase of the first left channel signals and the first right-channel signals
Deng.
Preferred scheme is that the energy of the predetermined frequency band signal in the second left channel signals and the second right-channel signals is entered
Row lifting is processed as, and the signal energy in the tonal range higher than 300 hertz and less than 5000 hertz in sound channel signal is carried
Rise 3 decibels.The frequency band acoustical signal energy for comparing audience concern is lifted, i.e., to the acoustical signal of energy collection midband in voice
Energy lift is carried out, so as to be compensated to produced energy loss in string sound removal process, to reduce tone color.
In order to realize above-mentioned another object, the binaural signal processing unit of the speaker playback that the present invention is provided includes string
Sound eliminates unit and tone color reduction unit, the L channel input and R channel input of tone color reduction unit accordingly with string sound
Eliminate L channel output end and R channel the output end connection of unit.String sound eliminate unit include L channel string sound cancellation module and
R channel string sound cancellation module, L channel string sound cancellation module includes the first delay circuit, the first attenuator and the first subtracter,
R channel string sound cancellation module includes the second delay circuit, the second attenuator and the second subtracter；The input of the first delay circuit
End is connected with the output end of the second subtracter, and output end is connected with the input of the first attenuator；The positive of the first subtracter is defeated
Enter end to be connected with the L channel input of string sound elimination unit, negative-phase input is connected with the output end of the first attenuator, output
The L channel output end for eliminating unit with string sound is held to be connected；The output end of the input of the second delay circuit and the first subtracter connects
Connect, output end is connected with the input of the second attenuator；The normal phase input end of the second subtracter eliminates the right sound of unit with string sound
Road input connection, negative-phase input is connected with the output end of the second attenuator, and output end eliminates the R channel of unit with string sound
Output end is connected.
From above scheme, eliminate unit using the string sound of recursive feedback network type carries out Processing for removing to string sound, with
Existing string sound cancellation element is compared, and the robustness to listener location is more preferable, and effective audition scope is bigger.And need not appoint
What convolution algorithm so that the amount of calculation of the device processing procedure is more much smaller than existing apparatus.
Specific scheme is that tone color reduction unit includes the 3rd delay circuit, the 3rd attenuator, the 3rd subtracter, the first frequency
Tape lifter, the 4th delay circuit, the 4th attenuator, the 4th subtracter and second band lifter.3rd delay circuit it is defeated
Enter end to be connected with the L channel input of tone color reduction unit, output end is connected with the input of the 3rd attenuator；3rd subtraction
The normal phase input end of device is connected with the L channel input of tone color reduction unit, the output end of negative-phase input and the 3rd attenuator
Connection, output end is connected with the input of first band lifter；The output end of first band lifter and tone color reduction unit
L channel output end connection；The input of the 4th delay circuit is connected with the R channel input of tone color reduction unit, output
End is connected with the input of the 4th attenuator；The normal phase input end of the 4th subtracter and the R channel input of tone color reduction unit
Connection, negative-phase input is connected with the output end of the 4th attenuator, and output end is connected with the input of second band lifter；The
The output end of two frequency band lifters is connected with the R channel output end of tone color reduction unit.
One more specifically scheme be the first delay circuit delay time it is equal with the delay time of the second delay circuit.
The delay time of the 3rd delay circuit is that the delay time of the delay circuit of twice the 4th of the delay time of the first delay circuit is
The twice of the delay time of the second delay circuit.Because the delay time in tone color reduction unit is time delay in string sound elimination unit
The twice of time, makes forming the frequency response curve opposite with the elimination of string sound, and then the sound elimination of elimination string during tone color is reduced
The tone color brought changes, to reach the effect of tone color reduction.
Another more specifically scheme be the first attenuator fading gain it is equal with the fading gain of the second attenuator；The
The fading gain of three attenuators is equal with the fading gain of the 4th attenuator.
In order to realize above-mentioned a further object, the two-channel processing system of the speaker playback that the present invention is provided includes two-channel
Signal processing apparatus, left speaker and right loudspeaker, dual-channel processing device to left speaker export left channel output signal and
The right channel output signal of loudspeaker output to the right.Wherein, dual-channel processing device is the two-channel described by any of the above-described scheme
Processing unit.
Brief description of the drawings
Fig. 1 is the structured flowchart of the binaural signal processing unit embodiment of speaker playback of the present invention;
Fig. 2 is the workflow diagram of the binaural signal processing method embodiment of speaker playback of the present invention.
Below in conjunction with specific embodiment and its accompanying drawing, the present invention is further illustrated.
Specific embodiment
The binaural signal processing unit embodiment of speaker playback
Referring to Fig. 1, there is the binaural signal processing unit of speaker playback string sound to eliminate unit 101 with tone color reduction list
Unit 102, for the left channel input signal L in stereoin(n) and right channel input signal RinN () is carried out at string sound elimination
Left channel output signal L is exported after reason and tone color reduction treatmentout(n) and right channel output signal Rout(n), when wherein n is represented
Between sequence.
String sound eliminates unit 101 and is made up of with R channel string sound cancellation module L channel string sound cancellation module, wherein, Zuo Sheng
Road string sound cancellation module is made up of the first delay circuit 62, the first attenuator 72 and the first subtracter 11, and R channel string sound is eliminated
Module is made up of the second delay circuit 61, the second attenuator 71 and the second subtracter 12.
The input of the first delay circuit 62 is connected with the output end of the second subtracter 12, output end and the first attenuator 72
Input connection.The normal phase input end of the first subtracter 11 is the L channel input that string sound eliminates unit 101, negative input
End is connected with the output end of the first attenuator 72, and output end is the L channel output end that string sound eliminates unit 101；Second time delay electricity
The input on road 61 is connected with the output end of the first subtracter 11, and output end is connected with the input of the second attenuator 71；Second
The normal phase input end of subtracter is the R channel input that string sound eliminates unit 101, negative-phase input and the second attenuator 71
Output end is connected, and output end is the R channel output end that string sound eliminates unit 101.
The process that string sound elimination unit 101 carries out string sound Processing for removing is as follows：
String sound eliminates 101 couples of left channel input signal L of input of unitin(n) and right channel input signal Rin(n) carry out
The first left channel signals L is exported after string sound Processing for removing1(n) and the first right-channel signals R1(n)。
L channel string sound cancellation module is to left channel input signal LinN the string sound Processing for removing process of () is, the first time delay
The attenuator 72 of circuit 62 and first the first right-channel signals R successively to being input into1N () enters line delay and attenuation processing, output is used
In to left channel input signal LinN the first string sound that () carries out string sound elimination eliminates signal G1×R1(n-D1), the first subtracter
The 11 left channel input signal L that will be input intoinN () eliminates signal G with the first string sound1×R1(n-D1) subtract each other, export the first L channel
Signal L1N (), obtains：
L1(n)= Lin(n)- G1×R1(n-D1)
Wherein, G1It is the fading gain of the first attenuator 72, span is usually -3 decibels to -2 decibels, the present embodiment
Elect -2.1 decibels as；D1It is the delay time of the first delay circuit 62, is the time difference that two-loudspeaker reaches same ear, value
60 microseconds to 100 microseconds are generally in the range of, the present embodiment elects 68 microseconds as.
R channel string sound cancellation module is to right channel input signal RinN the string sound Processing for removing process of () is, the second time delay
The attenuator 71 of circuit 61 and second the first left channel signals L successively to being input into1N () enters line delay and attenuation processing, output is used
In to right channel input signal RinN the first string sound that () carries out string sound elimination eliminates signal G2×L1(n-D2), the second subtracter
The 12 right channel input signal R that will be input intoinN () eliminates signal G with the second string sound2×L1(n-D2) subtract each other, export the first R channel
Signal R1N (), obtains：
R1(n)= Rin(n)- G2×L1(n-D2)
Wherein, G2It is the fading gain G of the fading gain of the second attenuator 71, value and the first attenuator 721It is identical；D2
It is the delay time of the second delay circuit 61, is the time difference that two-loudspeaker reaches same ear, value and the first delay circuit
62 delay time D1It is identical.
Due to string sound eliminate unit 101 be a recursive feedback network type circuit, compared with prior art, its can eliminate compared with
String sound in big region, effectively expands effective listening zone, i.e., also have in the certain area of dispersed parameters setting position compared with
Good string sound eradicating efficacy.
Tone color reduction unit 102 is carried by the 3rd delay circuit 21, the 3rd attenuator 31, the 3rd subtracter 41, first band
Rise device 51, the 4th delay circuit 22, the 4th attenuator 32, the 4th subtracter 42 and second band lifter 52 to constitute, for right
The acoustical signal after unit 101 is processed is eliminated through string sound carries out tone color reduction treatment, i.e., for the first left channel signals L1(n)
With the first right-channel signals R1N () carries out tone color reduction treatment after, left channel output signal L is exportedoutN () exports with R channel
Signal Rout(n)。
The input of the 3rd delay circuit 21 is the L channel input of tone color reduction unit, output end and the 3rd attenuator
31 input connection；The normal phase input end of the 3rd subtracter 41 is the L channel input of tone color reduction unit 102, and negative is defeated
Enter end to be connected with the output end of the 3rd attenuator 31, output end is connected with the input of first band lifter 51；First band
The output end of lifter 51 is the L channel output end of tone color reduction unit 102；The input of the 4th delay circuit 22 is tone color
The R channel input of reduction unit 102, output end is connected with the input of the 4th attenuator 32；The positive of the 4th subtracter 42
Input is the R channel input of tone color reduction unit, and negative-phase input is connected with the output end of the 4th attenuator 32, is exported
End is connected with the input of second band lifter 52；The output end of second band lifter 52 is tone color reduction unit 102
R channel output end.
In the present embodiment, first band lifter 51 avenges not wave filter with second band lifter 52 by two high frequencies
It is in series.The cut-off frequency of first high frequency snow not wave filter is 300 hertz, and gain is 3 decibels, for by acoustical signal intermediate frequency
Acoustical signal energy lift 3 decibel of the rate more than 300 hertz.The cut-off frequency of second high frequency snow not wave filter is 5000 hertz,
Gain is -3 decibels, high to offset first for 3 decibels of the acoustical signal energy reduction by frequency in acoustical signal more than 5000 hertz
Frequency avenges the lifting of not acoustical signal energy of the wave filter to frequency more than 5000 hertz, i.e., audience is only compared the part sound letter of concern
Number energy carry out 3 decibels of lifting, compensation string sound eliminates the energy loss that unit 101 carries out produced by string sound Processing for removing.
The process that tone color reduction unit carries out tone color reduction treatment is as follows：
3rd delay circuit 21 and the 3rd attenuator 31 the first left channel signals L successively to being input into1(n) enter line delay and
Attenuation processing, exports for the first left channel signals L1N () carries out the first tone color recovering signal G of tone color reduction3×L2(n-
D3), the first left channel signals L that the 3rd subtracter 41 will be input into1(n) and the first tone color recovering signal G3×L1(n-D3) subtract each other,
Export the second left channel signals L2N (), obtains：
L2(n)= L1(n)- G3×L1(n-D3)
Wherein, G3It is the fading gain of the 3rd attenuator 31, span is usually -4 decibels to -3 decibels, the present embodiment
Elect -3 decibels as；D3It is the delay time of the 3rd delay circuit 21, value is the delay time D of the first delay circuit 621Twice,
I.e. it can produce and eliminate the opposite frequency response curve of unit with string sound, with to generation during string sound elimination cell processing
Tone color loss carries out first time compensation.
51 couples of the second left channel signals L of input of first band lifter2N () carries out frequency band energy lifting treatment, frequency
3 decibels of band signal energy lift of the rate between 300 hertz to 5000 hertz, output left channel output signal Lout(n)。
Comparing audience the tone color loss of generation during string sound eliminates cell processing of concern frequency band carries out second compensation.
4th delay circuit 22 and the 4th attenuator 32 the first right-channel signals R successively to being input into1(n) enter line delay and
Attenuation processing, exports for the first right-channel signals R1N () carries out the second tone color recovering signal G of tone color reduction4×R1(n-
D4), the first right-channel signals R that the 4th subtracter 42 will be input into1(n) and the second tone color recovering signal G4×R1(n-D4) subtract each other,
Export the second right-channel signals R2N (), obtains：
R2(n)= R1(n)- G4×R1(n-D4)
Wherein, G4It is the fading gain G of the fading gain of the 4th attenuator 32, value and the 3rd attenuator 313It is identical；D4
It is the delay time of the 4th delay circuit 22, value is the delay time D of the second delay circuit 612Twice.
52 couples of the second right-channel signals R of input of second band lifter2N () carries out frequency band energy lifting treatment, frequency
3 decibels of the energy lift of frequency band of the rate between 300 hertz to 5000 hertz, output right channel output signal Rout(n)。
The binaural signal processing system embodiment of speaker playback
The binaural signal processing system of speaker playback has binaural signal processing unit, left speaker and right side
Loudspeaker, loudspeaker exports left channel output signal to binaural signal processing unit and loudspeaker exports right sound to the right to the left
Road output signal.
Binaural signal processing unit is the binaural signal treatment dress in above-mentioned binaural signal processing unit embodiment
Put.
The binaural signal processing method embodiment of speaker playback
Referring to Fig. 2, the binaural signal processing method of speaker playback has string sound removal process S1 and tone color recovery step
Rapid S2, for the left channel input signal L in stereoin(n) and right channel input signal RinN () is carried out at string sound elimination
Left channel output signal L is exported after reason and tone color reduction treatmentout(n) and right channel output signal Rout(n), when wherein n is represented
Between sequence.
The concrete processing procedure of string sound removal process is as follows：
String sound removal process has to left channel input signal LinN () carries out string sound Processing for removing and obtains the first L channel letter
Number L1The step of (n) and to right channel input signal RinN () carries out string sound Processing for removing and obtains the first right-channel signals R1(n)
Step, to eliminate the string sound between two loudspeakers and audience's ears.
To left channel input signal LinN process that () carries out string sound elimination is, by the first right-channel signals R1N () is with time delay
Time D1Enter line delay, and with fading gain G1Decayed, obtained for left channel input signal LinN () carries out string sound and disappears
Except the first string sound eliminate signal G1×R1(n-D1), from left channel input signal LinThe first string sound is subtracted in (n) and eliminates signal
G1×R1(n-D1), obtain the first left channel signals L1N (), obtains：
L1(n)= Lin(n)- G1×R1(n-D1)
Wherein, fading gain G1Span be usually -3 decibels to -2 decibels, the present embodiment elects -2.1 decibels as；Prolong
When time D1The time difference of same ear is reached for two-loudspeaker, span is usually 60 microseconds to 100 microseconds, the present embodiment
Elect 68 microseconds as.
To right channel input signal RinN process that () carries out string sound elimination is, by the first left channel signals L1N () is prolonging
When time D2Enter line delay, and with fading gain G2Decayed, obtained for right channel input signal RinN () carries out string sound
First string sound of elimination eliminates signal G2×L1(n-D2), from right channel input signal RinThe second string sound is subtracted in (n) and eliminates letter
Number G2×L1(n-D2), obtain the first right-channel signals R1N (), obtains：
R1(n)= Rin(n)- G2×L1(n-D2)
Wherein, fading gain G2Value and fading gain G1It is identical；D2The time of same ear is reached for two-loudspeaker
Difference, value and delay time D1It is identical.
Due to using recursive feedback formula processing mode, compared with prior art, it can eliminate the string sound in large area,
Effectively expand effective listening zone, i.e., also there is preferable string sound to eliminate effect in the certain area of dispersed parameters setting position
Really.
The concrete processing procedure of tone color reduction step is as follows：
To the first left channel signals L1N () is with delay time D3Enter line delay, and with fading gain G3Decayed, obtained
For to the first left channel signals L1N () carries out the first tone color recovering signal G of tone color reduction3×L1(n-D3), from the first left sound
Road signal L1The first tone color recovering signal G is subtracted in (n)3×L1(n-D3), obtain the second left channel signals L2N (), obtains：
L2(n)= L1(n)- G3×L1(n-D3)
Wherein, fading gain G3Span be usually -4 decibels to -3 decibels, the present embodiment elects -3 decibels as；Time delay
Time D3Value is delay time D1Twice.
To the second left channel signals L2N () carries out energy lift, frequency of the frequency between 300 hertz to 5000 hertz
3 decibels of the energy lift of band, obtains left channel output signal Lout(n)。
To the first right-channel signals R1N () is with delay time D4Enter line delay, and with fading gain G4Decayed, obtained
For to the first right-channel signals R1N () carries out the second tone color recovering signal G of tone color reduction4×R1(n-D4), from the first right sound
Road signal R1The second tone color recovering signal G is subtracted in (n)4×R1(n-D4), obtain the second right-channel signals R2N (), obtains：
R2(n)= R1(n)- G4×R1(n-D4)
Wherein, fading gain G4Value and fading gain G3It is identical, delay time D4It is delay time D2Twice.
To the second right-channel signals R2N () carries out energy lift, frequency of the frequency between 300 hertz to 5000 hertz
3 decibels of the energy lift of band, obtains right channel output signal Rout(n)。
Central scope of the invention is to eliminate string sound by using recursive feedback formula processing mode, and at through string sound elimination
Acoustical signal after reason carries out tone color reduction, and while effective listening zone is expanded, the tone color for producing loss is eliminated to string sound to be carried out
Repair.According to this design, the value of structure and delay time, fading gain, the energy lift frequency band of frequency band lifter etc. is not
Above-described embodiment is confined to, according to the actual requirements, also various obvious changes.
Claims (8)
1. the binaural signal processing method of speaker playback, including string sound removal process and tone color reduction step；
The tone color reduction step carries out tone color reduction to the acoustical signal processed through the string sound removal process；
The string sound removal process includes that the elimination of string sound is carried out to left channel input signal obtains the first left channel signals, and to the right side
Channel input signal carries out the elimination of string sound and obtains the first right-channel signals；
The string sound of the left channel input signal is eliminated is decayed by first right-channel signals time delay and with predetermined gain
To the first cross talk cancellation signal, subtract first cross talk cancellation signal from the left channel input signal and obtain first left side
Sound channel signal；
The string sound of the right channel input signal is eliminated is decayed by first left channel signals time delay and with predetermined gain
To the second cross talk cancellation signal, subtract the second string sound elimination signal from the right channel input signal and obtain first right side
Sound channel signal；
The tone color reduction step includes entering first left channel signals line delay and obtains first with predetermined gain decay
Tone color recovering signal, subtracts the first tone color recovering signal and obtains the second left channel signals from first left channel signals,
Energy to the predetermined frequency band signal in second left channel signals is lifted, and obtains left channel output signal；And to institute
State the first right-channel signals to enter line delay and obtain the second tone color recovering signal with predetermined gain decay, from first R channel
Signal subtracts the second tone color recovering signal and obtains the second right-channel signals, to the predetermined frequency in second right-channel signals
The energy of band signal is lifted, and obtains right channel output signal.
2. binaural signal processing method according to claim 1, it is characterised in that：
In the string sound removal process, to first left channel signals and the delay time phase of first right-channel signals
Deng；
In the tone color reduction step, the delay time to first left channel signals and first right-channel signals is
The twice of the delay time in the string sound removal process.
3. binaural signal processing method according to claim 1, it is characterised in that：
In the string sound removal process, to the fading gain phase of first left channel signals and first right-channel signals
Deng；
In the tone color reduction step, to the fading gain phase of first left channel signals and first right-channel signals
Deng.
4. the binaural signal processing method according to any one of claims 1 to 3, it is characterised in that：
Energy to the predetermined frequency band signal in second left channel signals and second right-channel signals is carried out at lifting
Manage and be, the signal energy in the tonal range higher than 300 hertz and less than 5000 hertz in sound channel signal is lifted 3 decibels.
5. the binaural signal processing unit of speaker playback, including string sound eliminates unit and tone color reduction unit；
The L channel input and R channel input of the tone color reduction unit accordingly eliminate a left side for unit with the string sound
Sound channel output end and R channel output end are connected；
The string sound eliminates unit includes L channel string sound cancellation module and R channel string sound cancellation module, the L channel string sound
Cancellation module includes the first delay circuit, the first attenuator and the first subtracter, and the R channel string sound cancellation module includes the
Two delay circuits, the second attenuator and the second subtracter；
The input of first delay circuit is connected with the output end of second subtracter, and output end and described first decays
The input connection of device；
The L channel input that the normal phase input end of first subtracter eliminates unit with the string sound is connected, negative-phase input
Output end with first attenuator is connected, and the L channel output end that output end eliminates unit with the string sound is connected；
The input of second delay circuit is connected with the output end of first subtracter, and output end and described second decays
The input connection of device；
The R channel input that the normal phase input end of second subtracter eliminates unit with the string sound is connected, negative-phase input
Output end with second attenuator is connected, and the R channel output end that output end eliminates unit with the string sound is connected；
The tone color reduction unit includes the 3rd delay circuit, the 3rd attenuator, the 3rd subtracter, first band lifter, the
Four delay circuits, the 4th attenuator, the 4th subtracter and second band lifter；
The input of the 3rd delay circuit is connected with the L channel input of the tone color reduction unit, output end with it is described
The input connection of the 3rd attenuator；
The normal phase input end of the 3rd subtracter is connected with the L channel input of the tone color reduction unit, negative-phase input
Output end with the 3rd attenuator is connected, and output end is connected with the input of the first band lifter；
The output end of the first band lifter is connected with the L channel output end of the tone color reduction unit；
The input of the 4th delay circuit is connected with the R channel input of the tone color reduction unit, output end with it is described
The input connection of the 4th attenuator；
The normal phase input end of the 4th subtracter is connected with the R channel input of the tone color reduction unit, negative-phase input
Output end with the 4th attenuator is connected, and output end is connected with the input of the second band lifter；
The output end of the second band lifter is connected with the R channel output end of the tone color reduction unit.
6. binaural signal processing unit according to claim 5, it is characterised in that：
The delay time of first delay circuit is equal with the delay time of second delay circuit, the 3rd time delay electricity
The delay time on road is the twice of the delay time of first delay circuit, and the delay time of the 4th delay circuit is institute
State the twice of the delay time of the second delay circuit.
7. binaural signal processing unit according to claim 5, it is characterised in that：
The fading gain of first attenuator is equal with the fading gain of second attenuator；
The fading gain of the 3rd attenuator is equal with the fading gain of the 4th attenuator.
8. the binaural signal processing system of speaker playback, including binaural signal processing unit, left speaker and the right side are raised one's voice
Device；
It is characterized in that：
The dual-channel processing device is binaural signal processing unit described in any one of claim 5 to 7；
The L channel output end of the binaural signal processing unit is connected with the left speaker, R channel output end with it is described
Right loudspeaker connection.
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