CN109089203A - The multi-channel signal conversion method and car audio system of car audio system - Google Patents
The multi-channel signal conversion method and car audio system of car audio system Download PDFInfo
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- CN109089203A CN109089203A CN201811072927.0A CN201811072927A CN109089203A CN 109089203 A CN109089203 A CN 109089203A CN 201811072927 A CN201811072927 A CN 201811072927A CN 109089203 A CN109089203 A CN 109089203A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
Abstract
The present invention relates to a kind of car audio system and its multi-channel signal conversion methods to have preferable utility model and operability specifically for interior Multi-channel loudspeaker system.The multi-channel signal conversion method, comprising: through acoustical signal and background acoustical signal are handled by hybrid matrix A, generate the multi channel signals in interior multiple channels；B, the multi channel signals in each channel are filtered, generate the signal of each loudspeaker unit；C, to the signal of each loudspeaker unit by position correction filter to due to loudspeaker unit and LisPos distance it is different caused by drive loudspeaker unit after the progress position correction of sense of hearing difference；Or, driving each loudspeaker unit sounding after further carrying out height correction to sense of hearing difference caused by the height difference due to loudspeaker unit by height correction filter.
Description
Technical field
The present invention relates to car audio system fields, and in particular to a kind of stereo converting multi-channel of car audio system
The method of signal.
Background technique
In car audio system, the performance of sound system can be increased using more loudspeaker, improve interior drive
The comfort of personnel.But most of music signal is all stereo double-channel signal at present, it is therefore desirable to will be stereo
Signal is converted into multi channel signals.But most of stereo methods for being converted into multi channel signals are both for family at present
The systems such as front yard movie theatre, Soundbar, in such systems, listener position and the distance between each loudspeaker are substantially equal
, and for car audio system, listener position is not optimum position, no matter which LisPos always to have one group to raise at
Sound device distance is recently.And due to the limitation by interior space, the installation site of loudspeaker is not highly desirable, it is therefore desirable to
For the particularity of interior space, using the method for the stereo conversion multi channel signals for being suitable for environment inside car, to improve vehicle
The sound playback performance of interior sound system.
The United States Patent (USP) US6697491B1 of Hamann company uses Time-Domain algorithm, according to four direction all around, with 45 degree
Eight regions are divided into for interval, signal is re-assigned in five loudspeakers according to the energy relationship between the channel of left and right.
But calculating process is more complicated to the division in eight regions.
The method that United States Patent (USP) US6496584B2 and Chinese patent ZL01802081.X is based on principal component analysis (PCA), is adopted
The weighted factor that left and right channel is calculated with LMSE method, isolates phonetic sound and background sound, by calculating left and right channel
Between related coefficient, determine under three-dimensional coordinate acoustical signal vector correlation, then according to energy conservation principle by phonetic sound with
Background sound is divided into left, center, right and around four signal, then by decorrelation filters circular signal be divided into it is left back and right after ring
Around the conversion of realization binary channels to 5 channels.This method is calculated from time domain, and method is simple, and arithmetic speed is fast, still
One can only be isolated around signal by PCA analysis, and using decorrelation filters separate it is left back and right after circular method
Certain error can be generated.
Voice signal is transformed into frequency domain by Short Time Fourier Transform by United States Patent (USP) US8295493B2, using minimum equal
The method of square error estimates through acoustical signal and background acoustical signal, then according to the spatial position of playback loudspeaker, to original
The space angle of left and right speakers such as carries out at point processing, through acoustical signal is distributed to the loudspeaker newly increased, to guarantee space
The accurate positionin of acoustic image.This method may be implemented the low voice speaking of any number of loudspeakers and put, and can also be applied in WFS system.But
Calculating process is complex, and the method for this angle bisecting can not effectively determine sound source position, easily cause acoustic image
Position error.
Current most of patents both for the stereo conversion multi channel signals under conventional environment method, for car
Method under particular surroundings compares shortage.
Summary of the invention
In view of the above-mentioned problems, the present invention is directed to propose a kind of multi-channel signal conversion method of car audio system, specially
For interior Multi-channel loudspeaker system, there is preferable utility model and operability.The present invention, which also aims to, proposes a kind of base
In the car audio system of the multi-channel signal conversion method of the car audio system.
According to the first aspect of the invention, the technical solution adopted by the present invention are as follows:
A kind of multi-channel signal conversion method of car audio system, includes the following steps:
A, through acoustical signal and background acoustical signal are handled by hybrid matrix, generates the multichannel letter in interior multiple channels
Number；
B, the multi channel signals in each channel are filtered, generate the signal of each loudspeaker unit；
C, to the signal of each loudspeaker unit by position correction filter to due to loudspeaker unit and LisPos away from
Loudspeaker unit is driven after carrying out position correction from sense of hearing difference caused by difference；Or, to the signal of each loudspeaker unit
Position school is carried out to the sense of hearing difference due to caused by loudspeaker unit is different from LisPos distance by position correction filter
Height correction is carried out to sense of hearing difference caused by the height difference due to loudspeaker unit by height correction filter again after just
Afterwards, each loudspeaker unit sounding is driven.
In one embodiment, in the step A, the multi channel signals in interior eight channels, including left front signal x are generatedFL
(n), front signal xFR(n), left rear signal xRL(n), right rear signal xRR(n), left around signal xSL(n), right surround signal xsR
(n), center signal xCEN(n), subwoofer signal xSUB(n)。
Specifically, the multi channel signals are shown below,
Wherein, W indicates conversion coefficient matrix, ω1、ω2、…ω18Conversion coefficient is respectively indicated,Indicate direct sound wave letter
Number,Indicate L channel background acoustical signal,Indicate right channel background acoustical signal.
In one embodiment, in the step B, high pass, band logical and low are carried out respectively to the multi channel signals in each channel
Messenger filtering, generates the signal of each high pitch, middle pitch and woofer unit.
In one embodiment, in the step C, the position correction filter uses all-pass system, to each loudspeaker list
The phase of the signal of member is adjusted.
Specifically, all-pass system HAP(z) it is defined as follows:
|HAP(ejω) |=A
Wherein, HAP(ejω) indicate all-pass system frequency-domain expression, e, j, ω respectively indicate natural constant, imaginary unit,
Angular frequency, real constant A are the gains of all-pass system；
In order to meet above-mentioned definition, HAP(z) each pole has a paired conjugation inverse zero point, reasonable complete
Way system has following general type:
Wherein, z, p, k respectively indicate complex variable, zero pole point quantity, digit, | ak| < 1, if there is a pole
In z=ak, then just there is a zero point to exist
In one embodiment, in the step C, the height correction filter is filtered using peak filter or waveform
Device.
In one embodiment, the through acoustical signal in the step A and background acoustical signal are from stereo binaural signal
The through acoustical signal of middle separationL channel background acoustical signalWith right channel background acoustical signalMore sound
Road signal conversion method further includes direct sound wave and background sound extraction step.
Preferably, the direct sound wave and background sound extraction step:
S1, respectively by left channel signals xL(n) and right-channel signals xR(n) progress Short Time Fourier Transform obtains right respectively
Answer the X of left channel signals and right-channel signalsL(m, k) and XR(m, k), wherein n indicates time domain sampling point, m and k respectively indicate from
Dissipate time and discrete frequency；
S2, introduce steric factor, by background sound signal representation be a signal by the different transmission paths in room and
The signal of generation, and respectively to XL(m, k) and XR(m, k) carries out energy estimation, obtains the energy P of left and right acoustic channelsL(m, k) and PR
(m,k)；
S3, the value for setting steric factor carry out the estimation that Signal separator obtains the through acoustical signal of time-frequency domain
The estimation of L channel background acoustical signalWith the estimation of right channel background acoustical signal
S4, the through acoustical signal that time domain is obtained by inverse Fourier transformL channel background acoustical signalThe right side and
Sound channel background acoustical signal
In step S1,
Wherein, there are J through sound sources, s in J representation spacej(n) through acoustical signal sometime is indicated,Respectively indicate the coefficient that through acoustical signal distributes to left and right channel signal, nL(n) and nR(n) left side is respectively indicated
The background signal in right channel；
Wherein, Sj(m, k) indicates the through acoustical signal of time-frequency domain,Respectively indicate direct sound wave letter
Number distribute to the time-frequency domain expression formula of the coefficient of left and right channel signal, NL(m, k) and NR(m, k) respectively indicates the back in left and right channel
The time-frequency domain expression formula of scape signal.
Step S2 is specifically included:
S21, in sometime m and a certain frequency range k, only exist a sound source Si, then
Wherein, AL、ARRespectively indicate the coefficient that through acoustical signal distributes to left and right channel signal；
S22, steric factor B is introducedL(m, k) and BR(m, k) obtains following expression NL(m, k)=BL(m, k) N (m, k),
NR(m, k)=BR(m, k) N (m, k),
Wherein, N (m, k) indicates the background signal of time-frequency domain, bL(m, k), bR(m, k) respectively indicate left and right channel space because
The amplitude of son,Respectively indicate the phase of the left and right channel space factor；
Then, XL(m, k) and XR(m, k) simplifies respectively are as follows:
XL(m, k)=AL(m, k) S (m, k)+BL(m, k) N (m, k)
XR(m, k)=AR(m, k) S (m, k)+BR(m, k) N (m, k)
Related coefficient between left and right sound track signals
Wherein, E { } indicates the expectation of signal；
S23, from energy point of view it can be concluded that the energy P of left and right acoustic channelsL(m, k) and PR(m, k) is respectively as follows:
Step S3 is specifically included: setting the value b of steric factorL(m, k)=bR(m, k)=1,Obtain PS(m, k), PN(m, k), AL(m, k), ARThe analytic solutions of (m, k), calculate following formula
(1) and (2)
By steric factor BL(m, k) and BR(m, k) is substituted into formula (2) respectively, is obtainedWith
According to the second aspect of the invention, the technical solution adopted by the present invention are as follows:
A kind of car audio system further includes believing for executing the multichannel of multi-channel signal conversion method as described above
Number conversion equipment.
The present invention uses above scheme, has the advantages that compared with prior art
(1) due to any position in the car, always there is one group of loudspeaker nearest from LisPos, cause acoustic image can be to this
Direction deflection, is corrected this group of loudspeaker by position correction filter, to correct acoustic image caused by short distance loudspeaker
Deflection；
(2) car audio system inconsistent to loudspeaker mounting height, when installation in the car due to loudspeaker, respectively
A loudspeaker mounting height is different, and if woofer is in door-plate bottom, in the middle part of door-plate, voice unit exists Squawker
A column or the positions such as instrument board and windshield junction, the difference of each loudspeaker mounting height will lead to the height of sound not
It is enough, loudspeaker can be modified using height correction filter, improve the height of sound；
(3) specifically for interior Multi-channel loudspeaker system, there is better practicability and operability.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical solution of the present invention
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of multi-channel signal conversion method according to the present invention；
Fig. 2 is the schematic diagram of stereo conversion Multi-channel loudspeaker array signal；
Fig. 3 is internal loudspeaker cell position and LisPos schematic diagram；
Fig. 4 is the signal processing flow figure of direct sound wave and background sound extraction step；
Fig. 5 shows left and right sound track signals；
Fig. 6 shows left and right sound track signals in related coefficient sometime；
Fig. 7 a, 7b, 7c respectively illustrate through acoustical signal, L channel background acoustical signal, right channel background sound after separation
Signal.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be understood by the person skilled in the art.It should be noted that the explanation for these embodiments is used to help
Understand the present invention, but and does not constitute a limitation of the invention.In addition, involved in the various embodiments of the present invention described below
And to technical characteristic can be combined with each other as long as they do not conflict with each other.
The present embodiment provides a kind of multi-channel signal conversion method of car audio system, detailed process referring to Fig. 1 and with
Lower description.
1, stereosonic left and right channel signal generates through acoustical signal after direct sound wave and background sound separating step
Background acoustical signalWith
2, direct sound wave and background acoustical signal generate the signal in interior eight channels, including left front letter after hybrid matrix
Number xFL(n), front signal xFR(n), left rear signal xRL(n), right rear signal xRR(n), left around signal xSL(n), right surround is believed
Number xSR(n), center signal xCEN(n), subwoofer signal xSUB(n)。
Wherein, several multi channel signals of generation are only related with two adjacent signals, such as front left channel signal xFLOnly
With left channel background signalWith through acoustical signalIt is related, and with right channel backgroundIt is unrelated；And center signal and subwoofer are believed
Number then there is relationship with left and right channel background acoustical signal and through acoustical signal.The hybrid matrix used in the present invention such as above formula.It is existing
Have to have in technology and have the generating mode for specifically describing hybrid matrix in some documents or patent, which is not described herein again.
3, after generating multi channel signals, each channel signal is filtered, to generate the signal of each loudspeaker.Tool
Body carries out high pass, band logical and low-pass signal to the multi channel signals in each channel respectively and filters, generate each high pitch, middle pitch and
The signal of woofer unit.Left front signal x is exemplarily only shown in Fig. 1FLFilter process, it is other more than seven
The filter process and left front signal x of channel signalFLFilter process it is identical, be not specifically illustrated herein.Such as Fig. 1 institute
Show, to left front signal xFLHigh pass, band logical and low-pass signal filtering are carried out, high pitch, middle pitch and woofer unit are respectively obtained
Signal.
4, in household audio and video system or loudspeaker array, the position of each loudspeaker is in straight line or same
In height, as shown in Figure 2.In this case, if comprising being located at P in stereo signal0Acoustic image, then with loudspeaker battle array
Column carry out playback time, it is only necessary to y4And y5Loudspeaker is assured that positioned at P0Acoustic image.But for car audio system, respectively
A loudspeaker unit is different apart from LisPos distance, and height is also different, it is therefore desirable to be modified to each loudspeaker.
(1), it is listened caused by different using position correction filter due to loudspeaker unit and LisPos first
Sense difference is corrected, and here for the effect of unified presentation correcting filter, has passed through position to each loudspeaker unit
Correcting filter.Position correction filter can use all-pass system, be adjusted to the phase of signal, without influencing amplitude.
All-pass system HAP(Z) it is defined as follows:
|HAP(ejω) |=A
The gain of all-pass system is real constant A.
In order to meet above-mentioned definition, HAP(z) each pole has a paired conjugation inverse zero point.It is reasonable complete
Way system has following general type:
Wherein, | ak| < 1.If there is a pole is in z=ak, then just there is a zero point to existFor example, having
One pole is in ak=rejθ, then a paired zero point must exists
(2), secondly using height correction filter it is different to the height due to loudspeaker unit caused by sense of hearing difference into
Row correction, here for the effect of unified presentation correcting filter, has passed through height correction filtering to each loudspeaker unit
Device.Height correction filter can use peak filter or domatic filter, handle some frequency range in signal, with
Promote the sense of hearing height of sound.
Position correction and height correction is illustrated in example as shown in connection with fig. 3.Fig. 3 shows interior front row
Speaker system (including left front high pitch and bass unit, it is right before high pitch and bass unit and center loudspeaker), in figure
Dashed circle position can regard sweet spot as, almost the same at a distance from each loudspeaker unit, but in the car
This position is as LisPos in space, and common LisPos are (the passenger side) positions before left front (master drive) and the right side
It sets, as shown in circle in figure, the two LisPos are all different at a distance from each loudspeaker unit, always there is one group of loudspeaker
It is nearest from LisPos.For example right front speaker is more closer from front right position than left loudspeaker from (the passenger side) position before the right side, at this time
In front right position audition, acoustic image front direction can be deflected to the right.Similarly, in front left position, since the distance of left loudspeaker is closer,
Acoustic image front direction can deflect to the left.Therefore the signal to each loudspeaker unit is needed to be modified to reach and preferably listen audio
Fruit.Each loudspeaker unit is modified by using position correction filter and height correction filter, can be made not
By on which position (before the left front or right side), acoustic image is stable in a fixed position.
In addition, the through acoustical signal and background acoustical signal in the present embodiment are straight to separate from stereo binaural signal
Up to acoustical signalL channel background acoustical signalWith right channel background acoustical signalIt is above-mentioned straight referring to shown in Fig. 4
It is specifically included up to sound and background sound separating step:
S1, respectively by left channel signals xL(n) and right-channel signals xR(n) Short Time Fourier Transform (STFT) is carried out to obtain
Respectively correspond the X of left channel signals and right-channel signalsL(m, k) and XR(m, k), wherein n indicates time domain sampling point, m and k difference
Indicate discrete time and discrete frequency；
S2, introduce steric factor, by background sound signal representation be a signal by the different transmission paths in room and
The signal of generation, and respectively to XL(m, k) and XR(m, k) carries out energy estimation, obtains the energy P of left and right acoustic channelsL(m, k) and PR
(m,k)；
S3, the value for setting steric factor carry out the estimation that Signal separator obtains the through acoustical signal of time-frequency domain
The estimation of L channel background acoustical signalWith the estimation of right channel background acoustical signal
S4, the through acoustical signal of time domain is obtained by inverse Fourier transform (ISTFT)L channel background acoustical signalWith right channel background acoustical signal
As shown in figure 5, left and right sound channels signal is respectively as follows:
Wherein, sj(n) through acoustical signal sometime is indicated,Indicate that through acoustical signal distributes to a left side
The coefficient of right channel signal, nL(n) and nR(n) background signal in left and right channel is indicated.
S1, after Short Time Fourier Transform (STFT), obtain
Wherein, m and k respectively indicate time and frequency.
S2, there are two assume:
S21, in some time m and some frequency range k, only exist a sound source Si, i.e.,Therefore
S22, steric factor B is introduced, is a signal by the different transmission paths in room by background sound signal representation
And the signal generated, similar to the expression way of through acoustical signal, i.e. NL(m, k)=BL(m, k) N (m, k), NR(m, k)=BR
(m, k) N (m, k)
In this way, above-mentioned formula can simplify for
XL(m, k)=AL(m, k) S (m, k)+BL(m, k) N (m, k)
XR(m, k)=AR(m, k) S (m, k)+BR(m, k) N (m, k)
Related coefficient (as shown in Figure 6) between left and right sound track signals is defined as
S23, from energy point of view it can be concluded that the energy in left and right channel is respectively as follows:
S3, under normal circumstances, background acoustic energy are less than through acoustic energy, andSo traditional method is
Ignore PN(m, k), i.e.,
It is assumed herein that the value of steric factor is bL=bR=1,Do not ignore PN(m,k)
Contribution, thus obtain PS(m, k), PN(m, k), AL(m, k), ARThe analytic solutions of (m, k).
Thus it is possible to calculate S (m, k), N (m, k)
Again by steric factor BL(m, k) and BR(m, k) is substituted into wherein it is possible to obtain NL(m, k), NR(m,k)。
S4, finally by inverse Fourier transform the through acoustical signal such as Fig. 7 a, 7b, 7c shown in respectively is obtainedBackground sound
SignalWith
In the extraction step, (1) is believed by defining the steric factor variable between left and right sound track signals with characterizing background sound
Difference number during acoustic propagation between the left and right channel due to caused by the factors such as RMR room reverb, space size；(2) can divide
The background acoustical signal in left and right channel is separated out, and conventional method can only isolate a background signal；(3) after steric factor being added
Calculating process is fairly simple, the analytic solutions of available direct sound wave and background sound.
The present embodiment also provides a kind of car audio system, including for executing multi-channel signal conversion side as described above
The multi-channel signal conversion equipment of method.As shown in connection with fig. 1, the extraction element specifically include direct sound wave and background sound separation module,
The hybrid matrix module being connected with the direct sound wave with background sound separation module, the hybrid matrix module and multiple groups filter phase
Even, multiple groups filter is corresponding with the multi channel signals in the multiple channel, (as shown in Figure 1 eight).Every group of filter point
Not Bao Kuo high-pass filter, bandpass filter and low-pass filter, and high-pass filter, bandpass filter and low-pass filter point
It is not connected with the hybrid matrix module, each high-pass filter is connected with a position correction filter respectively, each position
Correcting filter is connected with a height correction filter respectively, and the multi channel signals after output calibration
Deng.
Direct sound wave and background sound separation module specifically include STFT module, energy estimation block, signal separation module and
ISTFT module.Wherein, the input of STFT module is left channel signals xL(n) and right-channel signals xR(n), Fourier in short-term is carried out
The X of corresponding left channel signals and right-channel signals is exported after transformationL(m, k) and XR(m,k)；Energy estimation block receives STFT mould
The X of block outputL(m, k) and XR(m, k), and steric factor is introduced, it is a signal by room by background sound signal representation
Different transmission paths and the signal generated, and respectively to XL(m, k) and XR(m, k) carries out energy estimation, obtains the energy of left and right acoustic channels
Measure PL(m, k) and PR(m, k) and AL、ARAnd it exports to signal separation module；Signal separation module also sets steric factor
Value carries out Signal separator and obtainsWithAnd it exports to ISTFT module；ISTFT module respectively into
Row inverse Fourier transform exports through acoustical signalL channel background acoustical signalWith right channel background acoustical signal
The above embodiments merely illustrate the technical concept and features of the present invention, is a kind of preferred embodiment, and purpose exists
It cans understand the content of the present invention and implement it accordingly in person skilled in the art, protection of the invention can not be limited with this
Range.
Claims (10)
1. a kind of multi-channel signal conversion method of car audio system, which comprises the steps of:
A, through acoustical signal and background acoustical signal are handled by hybrid matrix, generates the multi channel signals in interior multiple channels；
B, the multi channel signals in each channel are filtered, generate the signal of each loudspeaker unit；
C, to the signal of each loudspeaker unit by position correction filter to due to loudspeaker unit and LisPos distance not
Loudspeaker unit is driven after carrying out position correction with caused sense of hearing difference；Or, passing through to the signal of each loudspeaker unit
Position correction filter to due to loudspeaker unit and LisPos distance it is different caused by after the progress position correction of sense of hearing difference
After carrying out height correction to sense of hearing difference caused by the height difference due to loudspeaker unit by height correction filter again, drive
Move each loudspeaker unit sounding.
2. multi-channel signal conversion method according to claim 1, which is characterized in that in the step A, generate car eight
The multi channel signals in a channel, including left front signal xFL(n), front signal xFR(n), left rear signal xRL(n), right rear signal xRR
(n), left around signal xsL(n), right surround signal xSR(n), center signal xCEN(n), subwoofer signal xSUB(n)。
3. multi-channel signal conversion method according to claim 2, which is characterized in that the multi channel signals such as following formula institute
Show,
Wherein, W indicates conversion coefficient matrix, ω1、ω2、…ω18Conversion coefficient is respectively indicated,The through acoustical signal of expression,Indicate L channel background acoustical signal,Indicate right channel background acoustical signal.
4. multi-channel signal conversion method according to claim 1, which is characterized in that in the step B, to each channel
Multi channel signals carry out respectively high pass, band logical and low-pass signal filtering, generate each high pitch, middle pitch and woofer unit
Signal.
5. multi-channel signal conversion method according to claim 1, which is characterized in that in the step C, the position school
Positive filter uses all-pass system, is adjusted to the phase of the signal of each loudspeaker unit.
6. multi-channel signal conversion method according to claim 5, which is characterized in that all-pass system HAP(z) it is defined as follows:
|HAP(ejω) |=A
Wherein, HAP(ejω) indicate all-pass system frequency-domain expression, e, j, ω respectively indicate natural constant, imaginary unit, angular frequency
Rate, real constant A are the gains of all-pass system；
In order to meet above-mentioned definition, HAP(z) each pole has a paired conjugation inverse zero point, reasonable all-pass system
System has following general type:
Wherein, z, p, k respectively indicate complex variable, zero pole point quantity, digit, | ak| < 1, if there is a pole is in z=
ak, then just there is a zero point to exist
7. multi-channel signal conversion method according to claim 1, which is characterized in that in the step C, the height school
Positive filter uses peak filter or mode filter.
8. multi-channel signal conversion method according to claim 1, which is characterized in that the direct sound wave letter in the step A
Number and background acoustical signal be the through acoustical signal separated from stereo binaural signalL channel background acoustical signalWith right channel background acoustical signalThe multi-channel signal conversion method further includes that direct sound wave and background sound are extracted and walked
Suddenly.
9. multi-channel signal conversion method according to claim 8, which is characterized in that the direct sound wave and background sound extract
Step includes:
S1, respectively by left channel signals xL(n) and right-channel signals xR(n) Short Time Fourier Transform is carried out to obtain respectively corresponding a left side
The X of sound channel signal and right-channel signalsL(m, k) and XR(m, k), wherein n indicates time domain sampling point, when m and k respectively indicate discrete
Between and discrete frequency；
S2, steric factor is introduced, background sound signal representation is generated for a signal by the different transmission paths in room
Signal, and respectively to XL(m, k) and XR(m, k) carries out energy estimation, obtains the energy P of left and right acoustic channelsL(m, k) and PR(m,
k)；
S3, the value for setting steric factor carry out the estimation that Signal separator obtains the through acoustical signal of time-frequency domainL channel
The estimation of background acoustical signalWith the estimation of right channel background acoustical signal
S4, the through acoustical signal that time domain is obtained by inverse Fourier transformL channel background acoustical signalAnd right channel
Background acoustical signal
10. a kind of car audio system, which is characterized in that including for executing such as the described in any item more sound of claim 1-9
The multi-channel signal conversion equipment of road signal conversion method.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811072927.0A CN109089203B (en) | 2018-09-17 | 2018-09-17 | Multi-channel signal conversion method of automobile sound system and automobile sound system |
| PCT/CN2019/075369 WO2020057051A1 (en) | 2018-09-17 | 2019-02-18 | Multi-channel signal conversion method for vehicle audio system and, vehicle audio system |
Applications Claiming Priority (1)
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| CN110475180A (en) * | 2019-08-23 | 2019-11-19 | 科大讯飞(苏州)科技有限公司 | Vehicle multi-sound area audio processing system and method |
| CN110677771A (en) * | 2019-11-05 | 2020-01-10 | 常州听觉工坊智能科技有限公司 | Wireless multi-channel sound system and automatic sound channel calibration method thereof |
| WO2020057051A1 (en) * | 2018-09-17 | 2020-03-26 | 中科上声（苏州）电子有限公司 | Multi-channel signal conversion method for vehicle audio system and, vehicle audio system |
| CN111918175A (en) * | 2020-07-10 | 2020-11-10 | 瑞声新能源发展(常州)有限公司科教城分公司 | Control method and device of vehicle-mounted immersive sound field system and vehicle |
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| WO2020057051A1 (en) | 2020-03-26 |
| CN109089203B (en) | 2020-10-02 |
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