CN104267287B - The method and apparatus of multi-channel audio equipment crosstalk coefficient measurement - Google Patents
The method and apparatus of multi-channel audio equipment crosstalk coefficient measurement Download PDFInfo
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Abstract
The present invention provides the measuring method and device of a kind of crosstalk coefficient of multi-channel audio equipment, and this method includes：By sending pumping signal to multiple input channels of equipment under test；The output signal of each output channel of equipment under test is acquired and obtains gathering signal, according to the signal spectrum of collection each passage of signal of change；The signal spectrum of each passage is corrected, obtains gathering the accurate parameter of signal；By comparing the corresponding parameter of collection signal and pumping signal, the crosstalk coefficient of interchannel respective type is calculated.The crosstalk coefficient of interchannel is calculated using above method, according to judging whether the crosstalk coefficient can interpolate that whether the audio frequency apparatus is qualified products in concerned countries standard.
Description
Technical field
Audio analysis field of the present invention, more particularly, to a kind of measuring method of the crosstalk coefficient of multi-channel audio equipment and
Device.
Background technology
Crosstalk coefficient is a standard for judging whether audio frequency apparatus is qualified.Crosstalk within the specific limits is to allow to exist
, the audio frequency apparatus that crosstalk coefficient exceedes the scope is then substandard product.
The method of measurement crosstalk coefficient is to use audio analyzer at present, and audio analyzer is integrated with audio signal and filled
Put with power amplifier device etc., spectrum information is obtained by signal sampling and Fourier transform, audio is carried out by spectrum analysis
Analyze and according to the crosstalk coefficient of Analysis result calculation.However, current audio analyzer is mainly used in the crosstalk of duplex channel,
The technology measured for crosstalk between multichannel is also immature.
The content of the invention
Based on this, it is necessary to provide the measuring method and system of a kind of multichannel crosstalk of audio frequency apparatus.
A kind of measuring method of the crosstalk coefficient of multi-channel audio equipment, comprises the following steps：
Pumping signal is sent to multiple input channels of equipment under test；
The output signal of each output channel of equipment under test is acquired and obtains gathering signal, according to collection signal of change
The signal spectrum of each passage；
The signal spectrum of each passage is corrected, obtains gathering the accurate parameter of signal；
By comparing the corresponding parameter of collection signal and pumping signal, the crosstalk coefficient of interchannel respective type is calculated.
In wherein a kind of embodiment, the parameter of signal, including frequency, phase and amplitude are gathered.
In wherein a kind of embodiment, the step of sending pumping signal to multiple input channels of equipment under test is specifically wrapped
Include following steps：
Receive the selection and the selection of passage to pumping signal type；
According to selection, pumping signal, the pumping signal of multiple input channels are sent to multiple input channels of equipment under test
Constitute a pumping signal collection；
The parameter and the corresponding passage of pumping signal of all pumping signals sent are recorded, the parameter of pumping signal includes
Amplitude, frequency and the first phase of signal.
In wherein a kind of embodiment, the system of selection of pumping signal includes：The pumping signal of any two input
The difference of frequency is more than the frequency resolution of predetermined number, and frequency resolution is frequency when FFT is done to collection signal
Rate resolution ratio.
In wherein a kind of embodiment, the output signal of each output channel of equipment under test is acquired and gathered
Signal, following steps are specifically included according to the step of the signal spectrum peak value of collection each passage of signal of change：
The output signal of each output channel of equipment under test is acquired and obtains gathering signal；
According to the signal spectrum peak value of collection each passage of signal of change, and record the corresponding frequency of each peak value.
In wherein a kind of embodiment, according to the signal spectrum peak value of collection each passage of signal of change, and each peak is recorded
The algorithm for being worth corresponding frequency is：
The collection signal of each passage does FFT, obtains the signal spectrum of each passage；
To each passage signal spectrum Modulus of access, find out all peak values of frequency spectrum modulus value；
A peak threshold is preset, gives up the peak value of the frequency spectrum modulus value less than the peak threshold, obtains final frequency spectrum mould
The peak value of value, and record the corresponding frequency of each peak value.
In wherein a kind of embodiment, the collection signal of each passage is corrected, obtains gathering the accurate parameter step of signal,
Specifically include：
Will collection signal be divided into it is isometric before and after two sections, respectively make etc. points FFT, obtain frequency spectrum；
Respectively on two sections of frequency spectrums, frequency is found equal to the corresponding frequency of above-mentioned spectrum peak, the spectrum of each frequency is calculated
Phase；
To each frequency, the phase tried to achieve on two sections of frequency spectrums is made poor；
Calculate preliminary frequency correction amount；
The preliminary frequency of adjustment is compared with positive quantity；
On the frequency spectrum of collection signal, the frequency of this frequency, phase and amplitude are corrected using the frequency correction amount after adjustment；
Frequency, the phase and amplitude of all frequencies have been corrected successively, obtain gathering the frequency spectrum after signal correction.
In wherein a kind of embodiment, by comparing the corresponding parameter of sampled signal and pumping signal, interchannel is calculated
The method of the crosstalk coefficient of respective type, specifically includes following steps：
Using one of passage as examination passage, the excitation letter for the input channel for removing examination passage is concentrated in pumping signal
Number, obtain pumping signal complementary set；
More whether there is the frequency of the pumping signal in pumping signal complementary set successively and examine or check the collection signal correction of passage
The corresponding frequency of the peak value of frequency spectrum is close afterwards；
According to comparative result, crosstalk coefficient is calculated；
Successively using each passage as examination passage, crosstalk coefficient of any passage to other any passages is calculated.
In wherein a kind of embodiment, the step of calculating crosstalk coefficient according to comparative result includes：If more than pumping signal
Concentrate one of pumping signal frequency and examination passage collection signal correction after frequency spectrum peak value it is corresponding one of them
Frequency is close, then judges that passage where this pumping signal has crosstalk to examination passage, then this will connect on examination channel frequency spectrum
The amplitude of the nearly corresponding spectrum of frequency and this cause crosstalk pumping signal amplitude com parison, obtain the crosstalk of amplitude-frequency response type
Coefficient；
Or, by examine or check channel frequency spectrum on this close to the corresponding first phase of frequency and this cause crosstalk pumping signal first phase
Compare, obtain the crosstalk coefficient of phase-frequency response type；
If frequency spectrum after the collection signal correction of the frequency of one of pumping signal and examination passage in pumping signal complementary set
Peak value respective frequencies in either of which keep off, then judge passage where this pumping signal to examining or check the crosstalk coefficient of passage
For 0.
A kind of measurement apparatus of the crosstalk coefficient of multi-channel audio equipment, including with lower module：
Signal transmitting module, for sending pumping signal to multiple input channels of equipment under test；
Computing module is gathered, the output signal for each output channel to equipment under test, which is acquired, obtains collection letter
Number, according to the signal spectrum of collection each passage of signal of change；
Correction module, for correcting each channel signal frequency spectrum, obtains gathering the accurate parameter of signal；
Crosstalk coefficient computing module, for the corresponding parameter by comparing collection signal and pumping signal, calculates interchannel
The crosstalk coefficient of respective type.
The present invention is adopted by sending pumping signal to multiple input channels of equipment under test to the signal of output channel
Collection, carries out Spectrum Conversion, and corrected spectrum, obtains gathering the accurate parameter of signal, by comparing collection signal and pumping signal
Corresponding parameter, calculate the crosstalk coefficient of each interchannel respective type.The crosstalk coefficient of interchannel, root are calculated using above method
It is judged that whether the crosstalk coefficient can interpolate that whether the audio frequency apparatus is qualified products in concerned countries standard.
Brief description of the drawings
Fig. 1 is the flow chart of the multichannel crosstalk measuring method of the audio frequency apparatus of the present invention；
Fig. 2 is the method flow diagram that pumping signal is sent to multiple inputs of equipment under test；
Fig. 3 is the method flow diagram for the spectrum peak for calculating each passage；
Fig. 4 is the method flow diagram of the specific algorithm using phase difference method corrected spectrum peak information；
Fig. 5 is the method flow diagram for calculating multichannel crosstalk coefficient；
Fig. 6 is the module map of the multichannel crosstalk measurement apparatus of the audio frequency apparatus of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The invention will be further described below in conjunction with the accompanying drawings, as shown in figure 1, the multichannel crosstalk measurement side of audio frequency apparatus
Method comprises the following steps：
S100：Pumping signal is sent to multiple input channels of equipment under test, all pumping signals constitute an excitation
Signal collection.Employed in the present embodiment for single frequency sinusoidal signal.As shown in Fig. 2 being sent to multiple inputs of equipment under test
The step of pumping signal, specific following sub-step included：
S110：Receive the selection and the selection of passage to pumping signal type.Equipment under test has signal input part and input
End, the input of equipment under test and output end corresponding with input constitute passage, and accordingly, a passage has input channel
And output channel.When sending pumping signal to multiple input channels simultaneously, the frequency of any two signal must distinguish between it is larger,
Distinguishing larger criterion is：The difference of the frequency of the pumping signal of any two input is greater than the frequency discrimination of predetermined number
Rate, such as 10.This frequency resolution is exactly frequency resolution when FFT (FFT) is to collection signal.
Single frequency sinusoidal signal needs certain signal to noise ratio, such as more than 10dB, or provides that its amplitude can not be less than a certain setting,
To be easier to distinguish signal and noise in succeeding spectral analysis.
S120：According to selection, pumping signal is sent to multiple input channels of equipment under test.
S130：Record the parameter and the corresponding passage of the pumping signal of all pumping signals sent.Pumping signal
Parameter include：Amplitude, frequency and the first phase of sinusoidal signal.
S200：The output signal of each output channel of equipment under test is acquired and obtains gathering signal, is believed according to collection
Number calculate the signal spectrum peak value of each passage.Pumping signal is handled through equipment under test, the signal gathered in equipment under test output end
Referred to as gather signal.As shown in figure 3, the step includes following sub-step：
S210：The output signal of each output channel of equipment under test is acquired and obtains gathering signal.For each defeated
The signal acquisition for going out passage is all to wait points collection, and it is fixed that points take as needed, the integral number power of points desirable 2.
S220：According to the signal spectrum peak value of collection each passage of signal of change, and record the corresponding frequency of each peak value.Specifically
Algorithm is：First, the collection signal of each passage does the FFT (FFT) of certain point number, such as collection signal itself
The FFT of points, obtains the signal spectrum of each passage.Secondly, to the signal spectrum Modulus of access of each passage, find out
All peak values of frequency spectrum modulus value, the method that peak value is looked in frequency spectrum modulus value can be the method being most worth using any judgement part,
As region is most worth search method.Because smaller peak value is probably noise peak, therefore, a last set peak threshold is given up
Less than the peak value of the frequency spectrum modulus value of the peak threshold, the peak value of final frequency spectrum modulus value is obtained, and records the corresponding frequency of each peak value.
These frequencies corresponding spectrum on frequency spectrum is spectrum peak.
S300：The signal spectrum of each passage is corrected, obtains gathering the accurate parameter of signal.Gather the parameter correction bag of signal
Include frequency, phase and amplitude.Bearing calibration uses phase difference correction method, it would however also be possible to employ other bearing calibrations.As shown in figure 4,
The signal spectrum of each passage is corrected using phase difference method, obtaining gathering the specific algorithm of the accurate parameter of signal includes following step
Suddenly：
S310：Will collection signal be divided into it is isometric before and after two sections, respectively make etc. points FFT, obtain frequency
Spectrum；In the present embodiment, can also be before the FFT to points such as two sections of collection signals works, can also be right respectively
Two sections collection signals add identical etc. count window function, in the case of being not added with, acquiescence all plus etc. points rectangular window.
S320：Respectively on two sections of frequency spectrums, frequency is found equal to the corresponding frequency of above-mentioned spectrum peak, the spectrum of frequency is calculated
The phase of value；
S330：To each frequency, the phase tried to achieve on two sections of frequency spectrums is made poor；
S340：Calculate preliminary frequency correction amount：The phase difference value divided by 2pi that above-mentioned steps are tried to achieve, obtain preliminary
Frequency correction amount；
S350：Frequency is adjusted compared with positive quantity, if obtained frequency is more than 0.5 or less than -0.5 compared with positive quantity, adjustment frequency is needed
Rate correcting value is so as to obtain final frequency correction amount.Specifically method of adjustment is：If frequency correction amount is less than -0.5, its value adds
1；If frequency correction amount is more than 0.5, value subtracts 1, if frequency correction amount is between -0.5 to 0.5, is worth constant；
S360：On the frequency spectrum of collection signal, using the frequency correction amount after adjustment correct the frequency of this frequency, phase and
Amplitude.
The formula of frequency correction is：(k+ Δ k) Δ f, wherein f are the frequency finally estimated to f=, and k is sampled signal frequency spectrum
The corresponding points of this upper frequency, Δ f is the frequency resolution of FFT, i.e. fs/N, wherein fs are sample rate, and N is change point
Number.
Phasing：Correcting value is：Updating formula：θ=θk0+ Δ k π, wherein, θ is final
Phase estimation, θk0For the corresponding phase angle of this frequency on sampled signal frequency spectrum.
Amplitude rectification：Wherein A is the spectral magnitude that correction of a final proof is obtained, ykIt is on sampled signal frequency spectrum
The corresponding amplitude of this frequency, function f is the frequency spectrum modular function of signal institute windowed function, if signal is done before Fast Fourier Transform (FFT) not
Adding window, then this functional value is Δ k.
S370：Using the above method, frequency, the phase and amplitude of all frequencies have been corrected successively, obtain collection signal school
Frequency spectrum after just.
By correction, the accurate frequency of sampled signal, amplitude and phase can be obtained.
S400：By comparing sampled signal parameter corresponding with pumping signal, the crosstalk coefficient of interchannel respective type is calculated.
As shown in figure 5, specific computational methods comprise the following steps：
S410：Using one of passage as examination passage, the input channel for removing the examination passage is concentrated in pumping signal
Pumping signal, obtain pumping signal complementary set, if this input channel is no signal, pumping signal complementary set is constant.For excitation
Each signal in signal complementary set, there is an input channel and output channel corresponding with input channel.
S420：More whether there is the frequency of the pumping signal in pumping signal complementary set successively and examine or check the collection signal of passage
The corresponding frequency of peak value of frequency spectrum after correction is close.Specifically, successively by the frequency of each pumping signal in pumping signal complementary set
Rate judges whether close compared with the corresponding frequency of all peak values of frequency spectrum after the collection signal correction of examination passage.Judge
Frequency is approached, and generally pre-sets a threshold value, the frequency spectrum after collection signal correction of exciting signal frequency and examination passage
The difference of the corresponding frequency of peak value is less than this threshold value, then it is assumed that close, otherwise to keep off.
S430：If the frequency of one of pumping signal is with examining or check after the collection signal correction of passage in pumping signal complementary set
The corresponding one of frequency of peak value of frequency spectrum is close, then passage where judging this pumping signal exists to examination passage goes here and there
Disturb, calculate crosstalk coefficient.Circular is：This by the examination passage is led close to the corresponding spectral magnitude of frequency with this
The amplitude com parison of crosstalk pumping signal is caused, the crosstalk coefficient of amplitude-frequency response type is obtained, or, this by the examination passage is approached
The corresponding frequency spectrum first phase of frequency causes the first of pumping signal of crosstalk to compare with this, obtains the crosstalk system of phase-frequency response type
Number.
S431：If in pumping signal complementary set after the collection signal correction of the frequency of one of pumping signal and examination passage
Either of which is kept off in the peak value respective frequencies of frequency spectrum, then crosstalk of the passage to examination passage where judging this pumping signal
Coefficient is 0.
Each passage is calculated into any passage to other any passages as examination passage according to above-mentioned steps successively
Crosstalk coefficient.
Using above method, crosstalk coefficient of the corresponding all passages of pumping signal complementary set to examination passage can be obtained.
Each output channel is measured using above measuring method, crosstalk that can be in the hope of any passage to other any passages
Coefficient.By changing the frequency situation and channel case of pumping signal, then the crosstalk of different situations can be measured.Such as, it is most simple
Single, a passage is fixed on to signal, every time to different frequency, then can measure the corresponding output channel of this input channel
To crosstalk of other output channels on these frequencies, suitable frequency is selected, it might even be possible to obtain crosstalk with modes such as fittings
Curve.Using above method can according to the crosstalk coefficient of calculating, judge the crosstalk coefficient whether in concerned countries standard energy
Enough judge whether the audio frequency apparatus is qualified.
The present invention also provides a kind of multichannel crosstalk measurement apparatus of audio frequency apparatus, including with lower module：
Signal transmitting module 100, for sending pumping signal, all excitation letters to multiple input channels of equipment under test
Number constitute a pumping signal collection.Employed in the present embodiment for single frequency sinusoidal signal.Signal transmitting module 100 includes：
Select unit：For receiving the selection to pumping signal type and the selection of passage.Equipment under test has signal input
End and input, the input of equipment under test and output end corresponding with input constitute passage, and accordingly, a passage has
Input channel and output channel.When sending pumping signal to multiple input channels simultaneously, the frequency of any two signal is necessary
Difference is larger, and distinguishing larger criterion is：The difference of the frequency of the pumping signal of any two input is greater than predetermined number
Frequency resolution, such as 10.Frequency resolution is exactly to do FFT (FFT) frequency discrimination to collection signal
Rate.Single frequency sinusoidal signal needs certain signal to noise ratio, such as more than 10dB, or provides that its amplitude can not be less than a certain regulation
Value, to be easier to distinguish signal and noise in succeeding spectral analysis.
Transmitting element：For according to selection, pumping signal to be sent to multiple input channels of equipment under test
Recording unit：Parameter and the corresponding passage of the pumping signal for recording all pumping signals sent.
Pumping signal parameter includes：Amplitude, frequency and the first phase of sinusoidal signal.
Gather computing module 200：Output signal for each output channel to equipment under test, which is acquired, to be gathered
Signal, according to the spectrum peak of collection each passage of signal of change.Pumping signal is handled through equipment under test, in equipment under test output end
The signal of collection is referred to as gathering signal.Collection computing module 200 is specifically included：
Collecting unit：Output signal for each output channel to equipment under test, which is acquired, to be obtained gathering signal.It is right
It is to wait points collection in the signal acquisition of each output channel, it is fixed that points take as needed, the integral number power of points desirable 2.
Spectrum peak computing unit, for the signal spectrum peak value according to collection each passage of signal of change, and records each peak
It is worth corresponding frequency.Specific algorithm is：First, doing for each passage gathers the FFT that signal does certain point number
(FFT), such as the FFT of collection signal itself points, the signal spectrum of each passage is obtained.Secondly, to each passage
Signal spectrum Modulus of access, finds out all peak values of frequency spectrum modulus value, the method that peak value is looked in frequency spectrum modulus value, can be use it is any
Judge the local method being most worth, such as region is most worth search method.Because smaller peak value is probably noise peak, therefore, finally set
A fixed peak threshold, the peak value for giving up the frequency spectrum modulus value less than the peak threshold obtains the peak value of final frequency spectrum modulus value, and remembers
Record the corresponding frequency of each peak value.These frequencies corresponding spectrum on frequency spectrum is spectrum peak.
Correction module 300：Signal spectrum for correcting each passage, obtains gathering the accurate parameter of signal.Gather signal
Parameter correction include frequency, phase and amplitude.Bearing calibration uses phase difference correction method, it would however also be possible to employ other correction sides
Method.The signal spectrum of each passage is corrected using phase difference method, obtains gathering the specific algorithm of the accurate parameter of signal including following
Step：
S310：Will collection signal be divided into it is isometric before and after two sections, respectively make etc. points FFT, obtain frequency
Spectrum；In the present embodiment, can also be before the FFT to points such as two sections of collection signals works, can also be right respectively
Two sections collection signals add identical etc. count window function, in the case of being not added with, acquiescence all plus etc. points rectangular window.
S320：Respectively on two sections of frequency spectrums, frequency is found equal to the corresponding frequency of the spectrum peak, the spectrum of frequency is calculated
Phase；S330：To each frequency, the phase tried to achieve on two sections of frequency spectrums is made poor；
S340：Calculate preliminary frequency correction amount：The phase difference value divided by 2pi that above-mentioned steps are tried to achieve, obtain preliminary
Frequency correction amount；
S350：Frequency is adjusted compared with positive quantity, if obtained frequency is more than 0.5 or less than -0.5 compared with positive quantity, adjustment frequency is needed
Rate correcting value is so as to obtain final frequency correction amount.Specifically method of adjustment is：If frequency correction amount is less than -0.5, its value adds
1；If frequency correction amount is more than 0.5, value subtracts 1, if frequency correction amount is between -0.5 to 0.5, is worth constant；
S360：On the frequency spectrum of collection signal, using the frequency correction amount after adjustment correct the frequency of the frequency, phase and
Amplitude；
The formula of frequency correction is：(k+ Δ k) Δ f, wherein f are the frequency finally estimated to f=, and k is sampled signal frequency spectrum
The corresponding points of this upper frequency, Δ f is the frequency resolution of FFT, i.e. fs/N, wherein fs are sample rate, and N is change point
Number.
Phasing：Correcting value is：Updating formula：θ=θk0+ Δ k π, wherein, θ is final
Phase estimation, θk0For the corresponding phase angle of this frequency on sampled signal frequency spectrum.
Amplitude rectification：Wherein A is the spectral magnitude that correction of a final proof is obtained, and yk is on sampled signal frequency spectrum
The corresponding amplitude of this frequency, function f is the frequency spectrum modular function of signal institute windowed function, if signal is done before Fast Fourier Transform (FFT) not
Adding window, then this functional value is Δ k.
S370：Using the above method, frequency, the phase and amplitude of all frequencies have been corrected successively, obtain collection signal school
Frequency spectrum after just.
By correction, the accurate frequency of sampled signal, amplitude and phase can be obtained.
Crosstalk coefficient computing module 400：For comparing sampled signal parameter corresponding with pumping signal, interchannel is calculated corresponding
The crosstalk coefficient of type.Crosstalk coefficient computing module 400 includes：
Examine or check channel unit：For using one of passage as examination passage, concentrating the removing examination to lead in pumping signal
The pumping signal of the input channel in road, obtains pumping signal complementary set, if this input channel is no signal, pumping signal complementary set is not
Become.For each signal in pumping signal complementary set, there are an input channel and output channel corresponding with input channel.
Comparing unit：For more whether having the frequency of one of pumping signal and examination in pumping signal complementary set successively
The corresponding one of frequency of peak value of frequency spectrum is close after the collection signal calibration of the input channel of passage.Specifically, successively will
The frequency of each pumping signal is corresponding with the peak value of all frequency spectrums after the collection signal correction of examination passage in pumping signal complementary set
Frequency compare, judge whether close.Determination frequency is approached, and can pre-set a threshold value, when exciting signal frequency and examining
The difference for looking into the corresponding frequency of spectrum peak after the collection signal correction of passage is less than this threshold value, then it is assumed that close, otherwise not connect
Closely.
Calculate crosstalk coefficient unit：For the comparative result according to comparing unit, crosstalk coefficient is calculated.If specifically, swashing
Encourage the frequency of one of pumping signal in signal complementary set corresponding with the peak value of frequency spectrum after the collection signal correction of examination passage
One of frequency is close, then passage where judging this pumping signal has crosstalk to examination passage, calculates crosstalk coefficient.
Circular is：By the examination passage this close to the corresponding spectral magnitude of frequency and this cause the width of crosstalk pumping signal
Value compares, and obtains the crosstalk coefficient of amplitude-frequency response type, or, by the examination passage this close to the corresponding frequency spectrum first phase of frequency
First with the pumping signal for causing crosstalk compares, and obtains the crosstalk coefficient of phase-frequency response type.
If frequency spectrum after the collection signal correction of the frequency of one of pumping signal and examination passage in pumping signal complementary set
Peak value respective frequencies in either of which keep off, then judge passage where this pumping signal to examining or check the crosstalk coefficient of passage
For 0.
Using apparatus above, crosstalk coefficient of the corresponding all passages of pumping signal complementary set to examination passage can be obtained.
Each passage is measured using above measurement apparatus, can be in the hope of crosstalk system of any passage to other any passages
Number.By changing the frequency situation and channel case of pumping signal, then the crosstalk of different situations can be measured.Such as, most simply
, a passage is fixed on to signal, every time to different frequency, then can measure the corresponding output channel pair of this input channel
Crosstalk of other output channels on these frequencies, selects suitable frequency, it might even be possible to which it is bent to obtain crosstalk with modes such as fittings
Line.It can judge whether the crosstalk coefficient can in concerned countries standard according to the crosstalk coefficient of calculating using above method
Judge whether the audio frequency apparatus is qualified.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of measuring method of the crosstalk coefficient of multi-channel audio equipment, it is characterised in that comprise the following steps：
Pumping signal is sent to multiple input channels of equipment under test, and records parameter and the institute of all pumping signals of transmission
The corresponding passage of pumping signal is stated, the parameter of the pumping signal includes amplitude, frequency and the first phase of signal, wherein, any two
The difference of the frequency of the pumping signal of individual input is greater than the frequency resolution of predetermined number, and the frequency resolution is that collection is believed
Number do frequency resolution during FFT；
The output signal of each output channel of equipment under test is acquired and obtains gathering signal, according to the collection signal of change
The signal spectrum of each passage；
Correct the signal spectrum of each passage, obtain gather the accurate parameter of signal, the parameter of the collection signal, including frequency,
Phase and amplitude；
By comparing the corresponding parameter of collection signal and pumping signal, the crosstalk coefficient of interchannel respective type is calculated.
2. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 1, it is characterised in that described to quilt
Multiple input channels of measurement equipment send pumping signal, and record the parameter and excitation letter of all pumping signals of transmission
The step of number corresponding passage, specifically includes following steps：
Receive the selection and the selection of passage to pumping signal type；
According to selection, pumping signal is sent to multiple input channels of equipment under test；
Record the parameter and the corresponding passage of the pumping signal of all pumping signals sent.
3. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 1, it is characterised in that described to quilt
The output signal of each output channel of measurement equipment, which is acquired, to be obtained gathering signal, according to the signal of collection each passage of signal of change
The step of frequency spectrum, specifically includes following steps：
The output signal of each output channel of equipment under test is acquired and obtains gathering signal；
According to the signal spectrum peak value of collection each passage of signal of change, and record the corresponding frequency of each peak value.
4. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 3, it is characterised in that according to described
The signal spectrum peak value of each passage of signal of change is gathered, and records the algorithm of the corresponding frequency of each peak value and is：
The collection signal of each passage does FFT, obtains the signal spectrum of each passage；
To the signal spectrum Modulus of access of described each passage, all peak values of frequency spectrum modulus value are found out；
A peak threshold is preset, gives up the peak value of the frequency spectrum modulus value less than the peak threshold, obtains final frequency spectrum modulus value
Peak value, and record the corresponding frequency of each peak value.
5. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 3, it is characterised in that the correction
The signal spectrum of each passage, obtains gathering the accurate parameter step of signal, specifically includes：
By it is described collection signal be divided into it is isometric before and after two sections, respectively make etc. points FFT, obtain frequency spectrum；
Respectively on two sections of frequency spectrums, frequency is found equal to the corresponding frequency of the spectrum peak, the spectrum of the frequency is calculated
Phase；
To frequency each described, the phase tried to achieve on two sections of frequency spectrums is made poor；
Calculate preliminary frequency correction amount；
The preliminary frequency is adjusted compared with positive quantity；
On collection signal spectrum, frequency, the phase and amplitude of the frequency are corrected using the frequency correction amount after the adjustment；
Frequency, the phase and amplitude of all frequencies have been corrected successively, obtain gathering the frequency spectrum after signal correction.
6. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 5, it is characterised in that the multiple
The pumping signal of input channel constitutes a pumping signal collection；
The corresponding parameter by comparing sampled signal and pumping signal, calculates the side of the crosstalk coefficient of interchannel respective type
Method, specifically includes following steps：
Using one of passage as examination passage, the excitation letter for the input channel for removing the examination passage is concentrated in pumping signal
Number, obtain pumping signal complementary set；
More whether there are the frequency of the pumping signal in pumping signal complementary set and gathering after signal correction for examination passage successively
The corresponding frequency of peak value of frequency spectrum is close；
According to comparative result, crosstalk coefficient is calculated；
Successively using each passage as examination passage, crosstalk coefficient of any passage to other any passages is calculated.
7. a kind of measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 6, it is characterised in that：
It is described according to comparative result, the step of calculating crosstalk coefficient includes：If one of pumping signal in pumping signal complementary set
Collection signal correction of the frequency with examining or check passage after the corresponding one of frequency of peak value of frequency spectrum be close, then judge described in
There is crosstalk in passage where pumping signal, then will be described close to frequency correspondence on the examination channel frequency spectrum to the examination passage
Spectrum amplitude and the input channel for causing crosstalk pumping signal amplitude com parison, obtain the string of amplitude-frequency response type
Disturb coefficient；
Or, will be described close to the corresponding first phase of frequency and the input channel for causing crosstalk on the examination channel frequency spectrum
The first of pumping signal compares, and obtains the crosstalk coefficient of phase-frequency response type；
If the peak for gathering frequency spectrum after signal correction of the frequency of one of pumping signal and examination passage in pumping signal complementary set
Either of which is kept off in value respective frequencies, then judges the passage of this pumping signal to examining or check the crosstalk coefficient of passage as 0.
8. a kind of measurement apparatus of the crosstalk coefficient of multi-channel audio equipment, it is characterised in that including with lower module：
Signal transmitting module, swashs for sending pumping signal to multiple input channels of equipment under test, and recording all of transmission
The parameter and the corresponding passage of the pumping signal of signal are encouraged, the parameter of the pumping signal includes the amplitude of signal, frequency
And first phase, wherein, the difference of the frequency of the pumping signal of any two input is greater than the frequency resolution of predetermined number, the frequency
Rate resolution ratio is frequency resolution when FFT is done to collection signal；
Computing module is gathered, the output signal for each output channel to equipment under test, which is acquired, to be obtained gathering signal, root
According to the signal spectrum of collection each passage of signal of change；
Correction module, for correcting each channel signal frequency spectrum, obtains gathering the accurate parameter of signal, the ginseng of the collection signal
Number, including frequency, phase and amplitude；
Crosstalk coefficient computing module, for the corresponding parameter by comparing collection signal and pumping signal, calculates interchannel corresponding
The crosstalk coefficient of type.
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| US10545182B2 (en) * | 2016-03-17 | 2020-01-28 | Texas Instruments Incorporated | Crosstalk calibration for multi-channel systems |
| CN105699769A (en) * | 2016-03-31 | 2016-06-22 | 南京工程学院 | Power grid frequency acquisition device and power grid frequency acquisition method applied in voice evidence obtaining |
| CN107656758A (en) * | 2016-07-25 | 2018-02-02 | 中兴通讯股份有限公司 | Reduce crosstalk method, device and system |
| GB201801412D0 (en) * | 2018-01-29 | 2018-03-14 | National Univ Of Ireland | Characterising radio frequency signal processing paths |
| CN108899048A (en) * | 2018-05-10 | 2018-11-27 | 广东省智能制造研究所 | A kind of voice data classification method based on signal Time-frequency Decomposition |
| CN111479207A (en) * | 2020-03-17 | 2020-07-31 | 深圳市金锐显数码科技有限公司 | Crosstalk detection method and system and audio analyzer |
| CN115824394B (en) * | 2023-01-06 | 2023-05-05 | 山东省科学院海洋仪器仪表研究所 | A Weak Signal Phase Alignment Method in Noise Measurement |
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