CN104267287A - Multi-channel audio device crosstalk coefficient measuring method and device - Google Patents
Multi-channel audio device crosstalk coefficient measuring method and device Download PDFInfo
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Abstract
The invention provides a multi-channel audio device crosstalk coefficient measuring method and device. The method comprises the steps that by sending stimulation signals to multiple input channels of a measured device, output signals of all output channels of the measured device are collected to obtain collected signals, and a signal frequency spectrum of all the channels is calculated according to the collected signals; the signal frequency spectrum of all the channels is corrected to obtain accurate parameters of the collected signals; by comparing corresponding parameters of the collected signals and the stimulation signals, the crosstalk coefficient of a corresponding type between the channels is calculated. By the adoption of the method for calculating the crosstalk coefficient between the channels, whether the audio device is a qualified product or not can be judged by judging whether the crosstalk coefficient meets related national standards.
Description
Technical field
Audio analysis field of the present invention, especially relates to a kind of measuring method and device of crosstalk coefficient of multi-channel audio equipment.
Background technology
Crosstalk coefficient is the standard judging that whether audio frequency apparatus is qualified.Crosstalk within the specific limits allows existence, and the audio frequency apparatus that crosstalk coefficient exceedes this scope is then substandard product.
The method of current measurement crosstalk coefficient uses audio analyzer, audio analyzer is integrated with sound signal generating means and power amplifier device etc., obtain spectrum information by signal sampling and Fourier transform, carry out audio analysis by spectrum analysis and according to the crosstalk coefficient of Analysis result calculation.But current audio analyzer is mainly used in the crosstalk of duplex channel, the technology measured for crosstalk between hyperchannel is also immature.
Summary of the invention
Based on this, be necessary measuring method and the system of the hyperchannel crosstalk that a kind of audio frequency apparatus is provided.
A measuring method for the crosstalk coefficient of multi-channel audio equipment, comprises the following steps:
Multiple input channels to equipment under test send pumping signal;
Collection signal is collected to the output signal of each output channel of equipment under test, calculates the signal spectrum of each passage according to collection signal;
Correct the signal spectrum of each passage, obtain collection signal parameter accurately;
By comparing the corresponding parameter of collection signal and pumping signal, calculate the crosstalk coefficient of interchannel respective type.
Wherein in a kind of embodiment, the parameter of collection signal, comprises frequency, phase place and amplitude.
Wherein in a kind of embodiment, the step that the multiple input channels to equipment under test send pumping signal specifically comprises the following steps:
Accept the selection of pumping signal type and the selection of passage;
According to selection, the multiple input channels to equipment under test send pumping signal, and the pumping signal of multiple input channel forms a pumping signal collection;
The parameter of all pumping signals that record sends and passage corresponding to pumping signal, the parameter of pumping signal comprises the amplitude of signal, frequency and first phase.
Wherein in a kind of embodiment, the system of selection of pumping signal comprises: the difference of frequency of the pumping signals of any two inputs is greater than the frequency resolution of predetermined number, and frequency resolution is frequency resolution when doing fast fourier transform to collection signal.
Wherein in a kind of embodiment, collect collection signal to the output signal of each output channel of equipment under test, the step calculating the signal spectrum peak value of each passage according to collection signal specifically comprises the following steps:
Collection signal is collected to the output signal of each output channel of equipment under test;
Calculate the signal spectrum peak value of each passage according to collection signal, and record frequency corresponding to each peak value.
Wherein in a kind of embodiment, calculate the signal spectrum peak value of each passage according to collection signal, and the algorithm recording frequency corresponding to each peak value is:
The collection signal of each passage does fast fourier transform, obtains the signal spectrum of each passage;
The signal spectrum delivery value of right each passage, finds out all peak values of frequency spectrum modulus value;
Preset a peak threshold, give up the peak value of the frequency spectrum modulus value being less than this peak threshold, obtain the peak value of final frequency spectrum modulus value, and record frequency corresponding to each peak value.
Wherein in a kind of embodiment, correct the collection signal of each passage, obtain collection signal parameter step accurately, specifically comprise:
Collection signal is divided into two sections, isometric front and back, the fast fourier transform of counting such as makes respectively, obtain frequency spectrum;
Respectively on two sections of frequency spectrums, find frequency to equal frequency corresponding to above-mentioned spectrum peak, calculate the phase place of the spectrum of each frequency;
To each frequency, by poor for the phase place that two sections of frequency spectrums are tried to achieve;
Calculate preliminary frequency correction amount;
Adjust preliminary frequency comparatively positive quantity;
On the frequency spectrum of collection signal, the frequency correction amount after Use Adjustment corrects the frequency of this frequency, phase place and amplitude;
Correct the frequency of all frequencies, phase place and amplitude successively, obtain the frequency spectrum after collection signal correction.
Wherein in a kind of embodiment, by comparing the corresponding parameter of sampled signal and pumping signal, calculating the method for the crosstalk coefficient of interchannel respective type, specifically comprising the following steps:
With one of them passage for examination passage, concentrate the pumping signal of the input channel of removing examination passage in pumping signal, obtain pumping signal complementary set;
The frequency after having the frequency of the pumping signal in pumping signal complementary set to correct with the collection signal of examination passage more successively the peak value of frequency spectrum is corresponding is close;
According to comparative result, calculate crosstalk coefficient;
Successively using each passage as examination passage, calculate the crosstalk coefficient of any passage to other any passage.
Wherein in a kind of embodiment, calculate the step of crosstalk coefficient according to comparative result to comprise: if one of them frequency that in pumping signal complementary set, frequency and the collection signal of examination passage of one of them pumping signal corrects the peak value of frequency spectrum afterwards corresponding is close, then judge that this pumping signal place passage exists crosstalk to examination passage, then this amplitude close to spectrum corresponding to frequency on examination channel frequency spectrum and this are caused the amplitude com parison of the pumping signal of crosstalk, obtain the crosstalk coefficient of amplitude-frequency response type;
Or, by this causes the first of the pumping signal of crosstalk to be compared close to the first phase that frequency is corresponding with this on examination channel frequency spectrum, obtain the crosstalk coefficient of phase-frequency response type;
If any one is all kept off in the frequency of one of them pumping signal and the peak value respective frequencies of the rear frequency spectrum of collection signal correction of examination passage in pumping signal complementary set, then judge that the crosstalk coefficient of this pumping signal place passage to examination passage is as 0.
A measurement mechanism for the crosstalk coefficient of multi-channel audio equipment, comprises with lower module:
Signal transmitting module, sends pumping signal for the multiple input channels to equipment under test;
Gather computing module, the output signal for each output channel to equipment under test collects collection signal, calculates the signal spectrum of each passage according to collection signal;
Correction module, for correcting each channel signal frequency spectrum, obtains collection signal parameter accurately;
Crosstalk coefficient computing module, for the corresponding parameter by comparing collection signal and pumping signal, calculates the crosstalk coefficient of interchannel respective type.
The present invention sends pumping signal by the multiple input channels to equipment under test, the signal of output channel is gathered, carry out Spectrum Conversion, and corrected spectrum, obtain the accurate parameter of collection signal, by comparing the corresponding parameter of collection signal and pumping signal, calculate the crosstalk coefficient of each interchannel respective type.Above method is adopted to calculate interchannel crosstalk coefficient, according to judging whether this crosstalk coefficient can judge in concerned countries standard whether this audio frequency apparatus is specification product.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the hyperchannel crosstalk measuring method of audio frequency apparatus of the present invention;
Fig. 2 is the method flow diagram of the multiple input ends transmission pumping signals to equipment under test;
Fig. 3 is the method flow diagram of the spectrum peak calculating each passage;
Fig. 4 is the method flow diagram of the specific algorithm adopting phase difference method corrected spectrum peak information;
Fig. 5 is the method flow diagram calculating hyperchannel crosstalk coefficient;
Fig. 6 is the module map of the hyperchannel crosstalk measurement mechanism of audio frequency apparatus of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below in conjunction with accompanying drawing, the invention will be further described, and as shown in Figure 1, the hyperchannel crosstalk measuring method of audio frequency apparatus comprises the following steps:
S100: the multiple input channels to equipment under test send pumping signal, and all pumping signals form a pumping signal collection.What adopt in the present embodiment is single frequency sinusoidal signal.As shown in Figure 2, the concrete following sub-step of step to multiple input ends transmission pumping signals of equipment under test comprises:
S110: the selection accepting selection to pumping signal type and passage.Equipment under test has signal input part and input end, and the input end of equipment under test and the output terminal corresponding with input end form passage, and accordingly, a passage has input channel and output channel.When sending pumping signal to multiple input channel simultaneously, the frequency of any two signals must be distinguished comparatively large, and distinguishing larger criterion is: the difference of the frequency of the pumping signal of any two inputs is greater than the frequency resolution of predetermined number, such as 10.Frequency resolution when this frequency resolution does fast fourier transform (FFT) to collection signal exactly.Single frequency sinusoidal signal demand has certain signal to noise ratio (S/N ratio), is such as greater than 10dB, or specifies that its amplitude can not be less than a certain setting, signal and noise range can be separated than being easier in succeeding spectral analysis.
S120: according to selection, the multiple input channels to equipment under test send pumping signal.
S130: the parameter of all pumping signals that record sends and passage corresponding to described pumping signal.The parameter of pumping signal comprises: the amplitude of sinusoidal signal, frequency and first phase.
S200: collect collection signal to the output signal of each output channel of equipment under test, calculates the signal spectrum peak value of each passage according to collection signal.Pumping signal, through equipment under test process, is called collection signal at the signal of equipment under test output terminal collection.As shown in Figure 3, this step comprises following sub-step:
S210: collection signal is collected to the output signal of each output channel of equipment under test.The collections of counting such as the signals collecting for each output channel is, counting, it is fixed to get as required, count desirable 2 integral number power.
S220: the signal spectrum peak value calculating each passage according to collection signal, and record frequency corresponding to each peak value.Specific algorithm is: first, and the collection signal of each passage does the fast fourier transform of certain point number (FFT), as the fast fourier transform that collection signal self is counted, obtains the signal spectrum of each passage.Secondly, to the signal spectrum delivery value of each passage, finding out all peak values of frequency spectrum modulus value, look for the method for peak value in frequency spectrum modulus value, can be the method using any judgement local to be worth most, as region is worth search procedure most.Because smaller peak value may be noise peak, therefore, finally set a peak threshold, give up the peak value of the frequency spectrum modulus value being less than this peak threshold, obtain the peak value of final frequency spectrum modulus value, and record frequency corresponding to each peak value.The spectrum that these frequencies are corresponding on frequency spectrum is spectrum peak.
S300: the signal spectrum correcting each passage, obtains collection signal parameter accurately.The parameter correction of collection signal comprises frequency, phase place and amplitude.Bearing calibration adopts phase difference correction method, also can adopt other bearing calibration.As shown in Figure 4, adopt phase difference method to correct the signal spectrum of each passage, the specific algorithm obtaining collection signal parameter accurately comprises the following steps:
S310: collection signal is divided into two sections, isometric front and back, the fast fourier transform of counting such as to make respectively, obtains frequency spectrum; In the present embodiment, can also before the fast fourier transform that two sections of collection signal works etc. are counted, can also add the window functions of counting such as identical to two sections of collection signals respectively, when not adding, acquiescence such as all to add at the rectangular window of counting.
S320: respectively on two sections of frequency spectrums, finds frequency to equal frequency corresponding to above-mentioned spectrum peak, calculates the phase place of the spectrum of frequency;
S330: to each frequency, by poor for the phase place that two sections of frequency spectrums are tried to achieve;
S340: calculate preliminary frequency correction amount: the phase difference value of above-mentioned steps being tried to achieve, divided by 2pi, obtains preliminary frequency correction amount;
S350: comparatively positive quantity of adjusting frequency, if the frequency obtained comparatively positive quantity be greater than 0.5 or be less than-0.5, then need adjust frequency correcting value thus obtain final frequency correction amount.Concrete method of adjustment is: if frequency correction amount is less than-0.5, then its value adds 1; If frequency correction amount is greater than 0.5, then value subtracts 1, if frequency correction amount is between-0.5 to 0.5, is then worth constant;
S360: on the frequency spectrum of collection signal, the frequency correction amount after Use Adjustment corrects the frequency of this frequency, phase place and amplitude.
The formula of frequency correction is: f=(k+ Δ k) Δ f, and wherein f is the final frequency estimated, k is corresponding the counting of this frequency on sampled signal frequency spectrum, and Δ f is the frequency resolution of FFT conversion, i.e. fs/N, wherein fs is sampling rate, and N is that conversion is counted.
Phase correction: correcting value is:
updating formula: θ=θ
k0+ Δ k π, wherein, θ is final phase estimation, θ
k0for the phasing degree that this frequency on sampled signal frequency spectrum is corresponding.
Amplitude rectification:
wherein A is the spectral magnitude that correction of a final proof obtains, y
kbe the amplitude that on sampled signal frequency spectrum, this frequency is corresponding, function f is the frequency spectrum modular function of signal institute windowed function, if signal non-windowing before doing Fast Fourier Transform (FFT), then this functional value is Δ k.
S370: adopt said method, corrected the frequency of all frequencies, phase place and amplitude successively, obtains the frequency spectrum after collection signal correction.
By correcting, sampled signal frequency, amplitude and phase place accurately can be obtained.
S400: by comparing sampled signal and the corresponding parameter of pumping signal, calculate the crosstalk coefficient of interchannel respective type.As shown in Figure 5, concrete computing method comprise the following steps:
S410: with one of them passage for examination passage, concentrate the pumping signal of the input channel of this examination passage of removing in pumping signal, obtain pumping signal complementary set, if this input channel is no signal, then pumping signal complementary set is constant.For each signal in pumping signal complementary set, there are an input channel and the output channel corresponding with input channel.
S420: the frequency that the peak value of the frequency spectrum after more whether having the frequency of the pumping signal in pumping signal complementary set to correct with the collection signal of examination passage is successively corresponding is close.Concrete, compared with the frequency that after the frequency of pumping signal each in pumping signal complementary set being corrected with the collection signal of examination passage successively, all peak values of frequency spectrum are corresponding, judge whether close.Determination frequency is close, usually pre-sets a threshold value, and after exciting signal frequency and the collection signal of examination passage correct, the difference of the frequency that the peak value of frequency spectrum is corresponding is less than this threshold value, then think close, otherwise for keeping off.
S430: if one of them frequency that in pumping signal complementary set, frequency and the collection signal of examination passage of one of them pumping signal corrects the peak value of afterwards frequency spectrum corresponding is close, then judge that this pumping signal place passage exists crosstalk to examination passage, calculate crosstalk coefficient.Circular is: the amplitude com parison this of this examination passage being caused crosstalk pumping signal close to spectral magnitude corresponding to frequency and this, obtain the crosstalk coefficient of amplitude-frequency response type, or, cause the first of the pumping signal of crosstalk to be compared close to the frequency spectrum first phase that frequency is corresponding with this this of this examination passage, obtain the crosstalk coefficient of phase-frequency response type.
S431: if any one is all kept off in the frequency of one of them pumping signal and the peak value respective frequencies of the rear frequency spectrum of collection signal correction of examination passage in pumping signal complementary set, then judge that the crosstalk coefficient of this pumping signal place passage to examination passage is as 0.
Successively using each passage as examination passage, calculate the crosstalk coefficient of any passage to other any passage according to above-mentioned steps.
Adopt above method, the crosstalk coefficient of all passages corresponding to pumping signal complementary set to examination passage can be obtained.Above measuring method is adopted to measure to each output channel, can in the hope of the crosstalk coefficient of any passage to other any passage.By changing frequency content and the channel case of pumping signal, then can measure the crosstalk of different situations.Such as, the most simply, a passage is fixed on to signal, all give different frequency at every turn, then can record output channel corresponding to this input channel to the crosstalk of other output channels on these frequencies, select suitable frequency, even can obtain crosstalk curve by modes such as matchings.Adopt above method according to the crosstalk coefficient calculated, can judge whether this crosstalk coefficient can judge in concerned countries standard that whether this audio frequency apparatus is qualified.
The present invention also provides a kind of hyperchannel crosstalk measurement mechanism of audio frequency apparatus, comprises with lower module:
Signal transmitting module 100, send pumping signal for the multiple input channels to equipment under test, all pumping signals form a pumping signal collection.What adopt in the present embodiment is single frequency sinusoidal signal.Signal transmitting module 100 comprises:
Selection unit: for accepting the selection of selection to pumping signal type and passage.Equipment under test has signal input part and input end, and the input end of equipment under test and the output terminal corresponding with input end form passage, and accordingly, a passage has input channel and output channel.When sending pumping signal to multiple input channel simultaneously, the frequency of any two signals must be distinguished comparatively large, and distinguishing larger criterion is: the difference of the frequency of the pumping signal of any two inputs is greater than the frequency resolution of predetermined number, such as 10.Frequency resolution does fast fourier transform (FFT) frequency resolution to collection signal exactly.Single frequency sinusoidal signal demand has certain signal to noise ratio (S/N ratio), is such as greater than 10dB, or specifies that its amplitude can not be less than a certain setting, signal and noise range can be separated than being easier in succeeding spectral analysis.
Transmitting element: for according to selection, to multiple input channels transmission pumping signals of equipment under test
Record cell: the passage that parameter and described pumping signal for recording all pumping signals of transmission are corresponding.Pumping signal parameter comprises: the amplitude of sinusoidal signal, frequency and first phase.
Gather computing module 200: the output signal for each output channel to equipment under test collects collection signal, calculates the spectrum peak of each passage according to collection signal.Pumping signal, through equipment under test process, is called collection signal at the signal of equipment under test output terminal collection.Gather computing module 200 specifically to comprise:
Collecting unit: the output signal for each output channel to equipment under test collects collection signal.The collections of counting such as the signals collecting for each output channel is, counting, it is fixed to get as required, count desirable 2 integral number power.
Spectrum peak computing unit, for calculating the signal spectrum peak value of each passage according to collection signal, and records frequency corresponding to each peak value.Specific algorithm is: first, each passage do the fast fourier transform (FFT) that collection signal does certain point number, as the fast fourier transform that collection signal self is counted, obtain the signal spectrum of each passage.Secondly, to the signal spectrum delivery value of each passage, finding out all peak values of frequency spectrum modulus value, look for the method for peak value in frequency spectrum modulus value, can be the method using any judgement local to be worth most, as region is worth search procedure most.Because smaller peak value may be noise peak, therefore, finally set a peak threshold, the peak value giving up the frequency spectrum modulus value being less than this peak threshold obtains the peak value of final frequency spectrum modulus value, and records frequency corresponding to each peak value.The spectrum that these frequencies are corresponding on frequency spectrum is spectrum peak.
Correction module 300: for correcting the signal spectrum of each passage, obtains collection signal parameter accurately.The parameter correction of collection signal comprises frequency, phase place and amplitude.Bearing calibration adopts phase difference correction method, also can adopt other bearing calibration.Adopt phase difference method to correct the signal spectrum of each passage, the specific algorithm obtaining collection signal parameter accurately comprises the following steps:
S310: collection signal is divided into two sections, isometric front and back, the fast fourier transform of counting such as to make respectively, obtains frequency spectrum; In the present embodiment, can also before the fast fourier transform that two sections of collection signal works etc. are counted, can also add the window functions of counting such as identical to two sections of collection signals respectively, when not adding, acquiescence such as all to add at the rectangular window of counting.
S320: respectively on two sections of frequency spectrums, finds frequency to equal frequency corresponding to this spectrum peak, calculates the phase place of the spectrum of frequency; S330: to each frequency, by poor for the phase place that two sections of frequency spectrums are tried to achieve;
S340: calculate preliminary frequency correction amount: the phase difference value of above-mentioned steps being tried to achieve, divided by 2pi, obtains preliminary frequency correction amount;
S350: comparatively positive quantity of adjusting frequency, if the frequency obtained comparatively positive quantity be greater than 0.5 or be less than-0.5, then need adjust frequency correcting value thus obtain final frequency correction amount.Concrete method of adjustment is: if frequency correction amount is less than-0.5, then its value adds 1; If frequency correction amount is greater than 0.5, then value subtracts 1, if frequency correction amount is between-0.5 to 0.5, is then worth constant;
S360: on the frequency spectrum of collection signal, the frequency correction amount after Use Adjustment corrects the frequency of this frequency, phase place and amplitude;
The formula of frequency correction is: f=(k+ Δ k) Δ f, and wherein f is the final frequency estimated, k is corresponding the counting of this frequency on sampled signal frequency spectrum, and Δ f is the frequency resolution of FFT conversion, i.e. fs/N, wherein fs is sampling rate, and N is that conversion is counted.
Phase correction: correcting value is:
updating formula: θ=θ
k0+ Δ k π, wherein, θ is final phase estimation, θ
k0for the phasing degree that this frequency on sampled signal frequency spectrum is corresponding.
Amplitude rectification:
wherein A is the spectral magnitude that correction of a final proof obtains, and yk is the amplitude that on sampled signal frequency spectrum, this frequency is corresponding, and function f is the frequency spectrum modular function of signal institute windowed function, if signal non-windowing before doing Fast Fourier Transform (FFT), then this functional value is Δ k.
S370: adopt said method, corrected the frequency of all frequencies, phase place and amplitude successively, obtains the frequency spectrum after collection signal correction.
By correcting, sampled signal frequency, amplitude and phase place accurately can be obtained.
Crosstalk coefficient computing module 400: for comparing sampled signal and the corresponding parameter of pumping signal, calculate the crosstalk coefficient of interchannel respective type.Crosstalk coefficient computing module 400 comprises:
Examination channel unit: for one of them passage for examination passage, concentrate the pumping signal of input channel of this examination passage of removing in pumping signal, obtain pumping signal complementary set, if this input channel is no signal, then pumping signal complementary set is constant.For each signal in pumping signal complementary set, there are an input channel and the output channel corresponding with input channel.
Comparing unit: one of them frequency for more whether there being the frequency of one of them pumping signal in pumping signal complementary set corresponding with the peak value of frequency spectrum after the collection signal calibration of the input channel of examination passage is successively close.Concrete, the frequency that after the frequency of pumping signal each in pumping signal complementary set being corrected with the collection signal of examination passage successively, the peak value of all frequency spectrums is corresponding compares, and judges whether close.Determination frequency is close, can pre-set a threshold value, and after exciting signal frequency and the collection signal of examination passage correct, the difference of the frequency that spectrum peak is corresponding is less than this threshold value, then think close, otherwise for keeping off.
Calculate crosstalk coefficient unit: for the comparative result according to comparing unit, calculate crosstalk coefficient.Concrete, if one of them frequency that in pumping signal complementary set, frequency and the collection signal of examination passage of one of them pumping signal corrects the peak value of afterwards frequency spectrum corresponding is close, then judge that this pumping signal place passage exists crosstalk to examination passage, calculate crosstalk coefficient.Circular is: the amplitude com parison this of this examination passage being caused crosstalk pumping signal close to spectral magnitude corresponding to frequency and this, obtain the crosstalk coefficient of amplitude-frequency response type, or, cause the first of the pumping signal of crosstalk to be compared close to the frequency spectrum first phase that frequency is corresponding with this this of this examination passage, obtain the crosstalk coefficient of phase-frequency response type.
If any one is all kept off in the frequency of one of them pumping signal and the peak value respective frequencies of the rear frequency spectrum of collection signal correction of examination passage in pumping signal complementary set, then judge that the crosstalk coefficient of this pumping signal place passage to examination passage is as 0.
Adopt above device, the crosstalk coefficient of all passages corresponding to pumping signal complementary set to examination passage can be obtained.Above measurement mechanism is adopted to measure to each passage, can in the hope of the crosstalk coefficient of any passage to other any passage.By changing frequency content and the channel case of pumping signal, then can measure the crosstalk of different situations.Such as, the most simply, a passage is fixed on to signal, all give different frequency at every turn, then can record output channel corresponding to this input channel to the crosstalk of other output channels on these frequencies, select suitable frequency, even can obtain crosstalk curve by modes such as matchings.Adopt above method according to the crosstalk coefficient calculated, can judge whether this crosstalk coefficient can judge in concerned countries standard that whether this audio frequency apparatus is qualified.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a measuring method for the crosstalk coefficient of multi-channel audio equipment, is characterized in that, comprises the following steps:
Multiple input channels to equipment under test send pumping signal;
Collection signal is collected to the output signal of each output channel of equipment under test, calculates the signal spectrum of each passage according to described collection signal;
Correct the signal spectrum of each passage, obtain collection signal parameter accurately;
By comparing the corresponding parameter of collection signal and pumping signal, calculate the crosstalk coefficient of interchannel respective type.
2. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 1, is characterized in that the parameter of described collection signal comprises frequency, phase place and amplitude.
3. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 2, is characterized in that, the step that described multiple input channels to equipment under test send pumping signal specifically comprises the following steps:
Accept the selection of pumping signal type and the selection of passage;
According to selection, the multiple input channels to equipment under test send pumping signal, and the pumping signal of described multiple input channel forms a pumping signal collection;
The parameter of all pumping signals that record sends and passage corresponding to described pumping signal, the parameter of described pumping signal comprises the amplitude of signal, frequency and first phase.
4. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 3, it is characterized in that, the system of selection of described pumping signal comprises: the difference of frequency of the pumping signals of any two inputs is greater than the frequency resolution of predetermined number, and described frequency resolution is the frequency resolution of collection signal when doing fast fourier transform.
5. as the measuring method of the crosstalk coefficient of the multi-channel audio equipment of claim 1 or 4, it is characterized in that, the output signal of described each output channel to equipment under test collects collection signal, and the step calculating the signal spectrum peak value of each passage according to collection signal specifically comprises the following steps:
Collection signal is collected to the output signal of each output channel of equipment under test;
Calculate the signal spectrum peak value of each passage according to described collection signal, and record frequency corresponding to each peak value.
6. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 5, it is characterized in that, calculate the signal spectrum peak value of each passage according to described collection signal, and the algorithm recording frequency corresponding to each peak value is:
The collection signal of each passage does fast fourier transform, obtains the signal spectrum of each passage;
To the signal spectrum delivery value of described each passage, find out all peak values of frequency spectrum modulus value;
Preset a peak threshold, give up the peak value of the frequency spectrum modulus value being less than this peak threshold, obtain the peak value of final frequency spectrum modulus value, and record frequency corresponding to each peak value.
7. the measuring method of the crosstalk coefficient of multi-channel audio equipment as claimed in claim 1, is characterized in that the signal spectrum of each passage of described correction obtains collection signal parameter step accurately, specifically comprises:
Described collection signal is divided into two sections, isometric front and back, the fast fourier transform of counting such as makes respectively, obtain frequency spectrum;
Respectively on two sections of frequency spectrums, find frequency to equal frequency corresponding to described spectrum peak, calculate the phase place of the spectrum of described frequency;
To frequency described in each, by poor for the phase place that two sections of frequency spectrums are tried to achieve;
Calculate preliminary frequency correction amount;
Adjust described preliminary frequency comparatively positive quantity;
On collection signal frequency spectrum, the frequency correction amount after described adjustment is used to correct the frequency of described frequency, phase place and amplitude;
Correct the frequency of all frequencies, phase place and amplitude successively, obtain the frequency spectrum after collection signal correction.
8. the measuring method of the crosstalk coefficient of the multi-channel audio equipment as described in claim 1 or 7, it is characterized in that, the described corresponding parameter by comparing sampled signal and pumping signal, calculates the method for the crosstalk coefficient of interchannel respective type, specifically comprises the following steps:
With one of them passage for examination passage, concentrate the pumping signal of the input channel removing described examination passage in pumping signal, obtain pumping signal complementary set;
The frequency that the peak value of the frequency spectrum after more whether having the frequency of the pumping signal in pumping signal complementary set to correct with the collection signal of examination passage is successively corresponding is close;
According to comparative result, calculate crosstalk coefficient;
Successively using each passage as examination passage, calculate the crosstalk coefficient of any passage to other any passage.
9. the measuring method of the crosstalk coefficient of a kind of multi-channel audio equipment as claimed in claim 8, is characterized in that:
Describedly calculate the step of crosstalk coefficient according to comparative result and comprise: if one of them frequency that in pumping signal complementary set, frequency and the collection signal of examination passage of one of them pumping signal corrects the peak value of frequency spectrum afterwards corresponding is close, then judge that described pumping signal place passage exists crosstalk to described examination passage, then by the amplitude of the spectrum corresponding close to frequency described on described examination channel frequency spectrum and the described amplitude com parison causing the pumping signal of the input channel of crosstalk, obtain the crosstalk coefficient of amplitude-frequency response type;
Or, cause the first of the pumping signal of the input channel of crosstalk to be compared with described the first phase corresponding close to frequency described on described examination channel frequency spectrum, obtain the crosstalk coefficient of phase-frequency response type;
If any one is all kept off in the frequency of one of them pumping signal and the peak value respective frequencies of the rear frequency spectrum of collection signal correction of examination passage in pumping signal complementary set, then judge that the crosstalk coefficient of the passage of this pumping signal to examination passage is as 0.
10. a measurement mechanism for the crosstalk coefficient of multi-channel audio equipment, is characterized in that, comprises with lower module:
Signal transmitting module, sends pumping signal for the multiple input channels to equipment under test;
Gather computing module, the output signal for each output channel to equipment under test collects collection signal, calculates the signal spectrum of each passage according to described collection signal;
Correction module, for correcting each channel signal frequency spectrum, obtains collection signal parameter accurately;
Crosstalk coefficient computing module, for the corresponding parameter by comparing collection signal and pumping signal, calculates the crosstalk coefficient of interchannel respective type.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| 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 |
| CN115824394A (en) * | 2023-01-06 | 2023-03-21 | 山东省科学院海洋仪器仪表研究所 | Weak signal phase alignment method in noise measurement |
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