CN112669871A - Signal processing method, electronic device and storage device - Google Patents

Abstract

The application discloses a signal processing method, an electronic device and a storage device, wherein the method comprises the following steps: acquiring at least one first signal acquired by a signal acquisition device; decomposing the first signal into a plurality of first subband signals in the frequency domain; wherein the plurality of first subband signals have different center frequencies; respectively carrying out non-target signal elimination on the first sub-band signals to obtain second sub-band signals; wherein the second subband signal retains at least part of the non-target signal; respectively eliminating the target signals of the second sub-band signals to obtain third sub-band signals; synthesizing the corresponding second sub-band signal and the third sub-band signal to obtain a fourth sub-band signal; the plurality of fourth subband signals are synthesized to obtain a second signal. According to the scheme, mutual interference among the plurality of first sub-band signals during signal processing can be reduced, and the enhancement effect on the target signal in the second signal is improved.

Description

Signal processing method, electronic device, and storage device

technical field

The present application relates to the technical field of signal processing, and in particular, to a signal processing method, electronic equipment, and storage device.

Background technique

With the continuous development of smart devices and the wider application of human-computer interaction technology, the accuracy requirements for signal processing are also gradually increasing. Therefore, the signal needs to be processed to filter out the non-target signal in the signal, so as to achieve the effect of enhancing the target signal in the signal.

In the existing signal processing method, after obtaining multiple signals, short-time Fourier transform is performed on each signal. When performing short-time Fourier transform, considering the signal delay, a longer window length cannot be selected. The spectral leakage between the frequency bands corresponding to the signal is relatively large, and any subsequent filtering operation will affect the adjacent frequency bands, which will also affect the target signal in the adjacent frequency band. In view of this, how to improve the signal processing method has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The main technical problem to be solved by the present application is to provide a signal processing method, electronic equipment, and storage device, which can decompose the first signal collected by the signal acquisition device into multiple first subband signals in the frequency domain, and then analyze the multiple first subband signals. A sub-band signal is processed and then synthesized to obtain a second signal, thereby reducing mutual interference between multiple first sub-band signals during signal processing.

In order to solve the above technical problem, a first aspect of the present application provides a signal processing method, including: acquiring at least one first signal collected by a signal collecting device; decomposing the first signal into a plurality of first subbands in the frequency domain signal; wherein, the plurality of first subband signals have different center frequencies; respectively perform non-target signal cancellation on the first subband signals to obtain a second subband signal; wherein, the second subband signals The signal retains at least part of the non-target signal; the target signal cancellation is performed on the second subband signal respectively to obtain a third subband signal; the corresponding second subband signal and the third subband signal are processed. synthesizing to obtain a fourth subband signal; and synthesizing a plurality of the fourth subband signals to obtain a second signal.

In order to solve the above technical problem, a second aspect of the present application provides an electronic device, comprising a memory and a processor coupled to each other, the memory stores program instructions, and the processor is configured to execute the program instructions to realize the above-mentioned first step. The signal processing method in one aspect.

In order to solve the above technical problem, a third aspect of the present application provides a storage device, where the storage device stores program instructions that can be executed by a processor, and the program instructions are used to implement the signal processing method in the first aspect.

In the above scheme, the at least one first signal collected by the signal acquisition device is decomposed into a plurality of first subband signals with different center frequencies in the frequency domain, and the first subband signals are respectively subjected to non-target signal elimination to obtain some remaining non-target signals. The second subband signal of the target signal, and then the target signal cancellation is performed on the second subband signal to obtain a third subband signal, then the third subband signal is a signal other than the target signal in the second subband signal, Synthesize the corresponding second subband signal and the third subband signal to obtain a fourth subband signal, and obtain a second signal after synthesizing a plurality of fourth subband signals, so that the second signal mainly includes the target signal . Therefore, by decomposing the first signal into a plurality of first sub-band signals, and performing signal processing in units of the first sub-band signals, the spectral aliasing of the first sub-band signals in each frequency band is reduced, and the The mutual interference during signal processing among the multiple first subband signals improves the enhancement effect on the target signal in the second signal.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort. in:

1 is a schematic flowchart of an embodiment of a signal processing method of the present application;

2 is a schematic diagram of a first subband signal response curve corresponding to step S12 in FIG. 1;

3 is a schematic flowchart of another embodiment of the signal processing method of the present application;

FIG. 4 is a schematic frame diagram of an embodiment corresponding to FIG. 3;

5 is a schematic diagram of a framework of an embodiment of an electronic device of the present application;

FIG. 6 is a schematic diagram of a framework of an embodiment of a storage device of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship. Also, "multiple" herein means two or more than two.

Please refer to FIG. 1 . FIG. 1 is a schematic flowchart of an embodiment of a signal processing method of the present application. Specifically, the following steps can be included:

Step S11: Acquire at least one first signal collected by the signal collection device.

Specifically, the signal collection device has a preset position, and the signal collection device is used to collect signals within a preset range, and the preset range can be any angle from 0 to 360°.

Further, if the signal acquisition device acquires the first signal, wherein, the signal sent by the target signal source is the target signal, and the first signal usually includes the non-target signal composed of the target signal and the interference signal. The positional relationship between the preset positions of the signal acquisition device is to obtain the relative position of the signal acquisition device and the target signal source.

In an implementation scenario, the signal collection device is a microphone, and the microphone is used to collect sound data. After the microphone collects the first signal, the first signal may be sound data including the target signal sent by the user and part of the interference signal, wherein, The user is the target signal source that sends out the target signal, that is, the target sound source. The interference signal in the sound data is noise. The relative position of the target sound source and the microphone can be obtained by measuring the positional relationship between the target sound source and the microphone.

Step S12: Decompose the first signal into multiple first subband signals in the frequency domain, wherein the multiple first subband signals have different center frequencies.

Specifically, the first signal is decomposed in the frequency domain to obtain first subband signals corresponding to multiple frequency bands, and the center frequencies of the multiple first subband signals on their corresponding response curves are different, When decomposing the first signal, if the first signal includes the target signal and the non-target signal, both the target signal and the non-target signal in the first signal are decomposed in the frequency domain.

In an implementation scenario, please refer to FIG. 2. FIG. 2 is a schematic diagram of the response curve of the first subband signal corresponding to step S12 in FIG. 1. After the first signal is decomposed into multiple first subband signals, the multiple frequency bands On the response curves of the corresponding first sub-band signals, the center frequencies ω ₀ , ω ₁ , ω ₂ . . . of different first sub-band signals are different. The response curves corresponding to the adjacent center frequencies are frequency shifted in the frequency domain.

Step S13: Performing non-target signal cancellation on the first sub-band signal respectively to obtain a second sub-band signal, wherein the second sub-band signal retains at least part of the non-target signal.

Specifically, the first subband signal is filtered to filter out at least part of the non-target signal in the first subband signal to obtain the second subband signal, and then the preliminary filtering of the first subband signal is performed to eliminate at least part of the non-target signal in the first subband signal. Some untargeted signals.

In an implementation scenario, a corresponding reference beam filter is designed for the first subband signal, and the direction corresponding to the relative position of the signal acquisition device and the target signal source is set as the target direction, and its angle is θ ₀ , and the center of each frequency band is set as the target direction. The frequency prevails, the target direction steering vector d _m (θ ₀ ) and the diffuse field coherence matrix Γ _m of each frequency band are obtained, and the reference beam filter w _m corresponding to the first subband signal in each frequency band is calculated with the following optimization and constraints :

w _m ^H d _m (θ ₀ )=1 (2)

Among them, σ _thr is the lower limit constraint of white noise gain, and when formula (2) and formula (3) are satisfied, obtain the corresponding reference beam filter w _m when L(ω) in formula (1) is the maximum value.

It can be understood that the center frequency of each first subband signal is different, therefore, the target direction steering vector d _m (θ ₀ ) and the diffusion field coherence matrix Γ _m corresponding to different first subband signals are also different. , and the obtained reference beam filters w _m respectively correspond to the first subband signals.

Further, since there is a corresponding relationship between the reference beam filter w _m and the first sub-band signal, the reference beam filter w _m corresponding to the first sub-band signal is used to filter out at least part of the non-target signals, which can improve the filtering effect of the first sub-band signal. Accuracy of non-target signals in a subband signal.

Step S14: Perform target signal cancellation on the second subband signal respectively to obtain a third subband signal.

Specifically, the signal at the relative position of the signal acquisition device and the target signal source in the second subband signal is suppressed, and then the target signal in the second subband signal is eliminated to obtain the third subband signal.

In one implementation scenario, matrix decomposition is used to solve the linear complement space of the second subband signal to obtain the third subband signal outside the relative position.

In another implementation scenario, a blocking beam with complementary spatial angle in the relative position direction is designed, in which, only the signal in the relative position direction is suppressed in the blocking beam, and the gains in other directions except the relative position are set as 1, and then process the second subband signal through an adaptive filter and a blocking beam to obtain a third subband signal after eliminating the target signal.

Step S15: Synthesize the corresponding second subband signal and the third subband signal to obtain a fourth subband signal.

Specifically, the second subband signal includes the target signal at the relative position of the signal acquisition device and the target signal source, and the non-target signal outside the relative position. If the target signal is eliminated in the third subband signal, the third subband signal is the non-target signal outside the relative position, and the third subband signal is used to cancel the relative position of the corresponding second subband signal. out-of-target signals, so as to obtain a plurality of fourth subband signals.

Step S16: Synthesize a plurality of fourth subband signals to obtain a second signal.

Specifically, multiple fourth subband signals are synthesized to splicing multiple frequency bands to obtain a second signal. The second signal mainly includes the target signal at the relative position of the signal acquisition device and the target signal source.

It should be noted that, since the first signal is decomposed in the frequency domain in this embodiment, a plurality of first subband signals are obtained, and the spectral aliasing of the first subband signal is reduced, which is different from that of the full frequency domain. Signal processing. When filtering a signal in the full frequency domain, any filtering operation will affect adjacent frequency bands, resulting in nonlinear distortion. This embodiment effectively reduces the impact of filtering on the current frequency band on other frequency bands. The influence of , improves the accuracy of filtering the non-target signal, so that the second signal is enhanced compared to the way of processing the signal in the full frequency domain.

In the above scheme, the at least one first signal collected by the signal acquisition device is decomposed into a plurality of first subband signals with different center frequencies in the frequency domain, and the first subband signals are respectively subjected to non-target signal elimination to obtain some remaining non-target signals. The second subband signal of the target signal, and then the target signal cancellation is performed on the second subband signal to obtain a third subband signal, then the third subband signal is a signal other than the target signal in the second subband signal, Synthesize the corresponding second subband signal and the third subband signal to obtain a fourth subband signal, and obtain a second signal after synthesizing a plurality of fourth subband signals, so that the second signal mainly includes the target signal . Therefore, by decomposing the first signal into a plurality of first sub-band signals, and performing signal processing in units of the first sub-band signals, the spectral aliasing of the first sub-band signals in each frequency band is reduced, and the The mutual interference during signal processing among the multiple first subband signals improves the enhancement effect on the target signal in the second signal.

Please refer to FIG. 3 , which is a schematic flowchart of another embodiment of the signal processing method of the present application. Specifically, the following steps can be included:

Step S31: Acquire at least one first signal collected by the signal collection device.

Specifically, the signal collection device may include multiple signal collection units, and the above step S31 specifically includes: acquiring multiple first signals collected by the multiple signal collection units.

In an implementation scenario, in response to the plurality of first signals being collected by the plurality of signal collection units, the positional relationship between the target signal source and the center position of the signal collection device is obtained, so as to obtain the relative position of the signal collection device and the target signal source, and then Improve the efficiency of signal processing.

In another implementation scenario, in response to the plurality of first signals collected by the plurality of signal collection units, the positional relationship between the signal collection units and the target signal source is obtained respectively, and then the angle between the plurality of signal collection units and the target signal source is obtained. The first average value is used to generate the relative position of the signal acquisition device and the target signal source based on the first average value, thereby improving the accuracy of the relative position.

Step S32: Decompose the first signal into multiple first subband signals in the frequency domain, wherein the multiple first subband signals have different center frequencies.

Subband decomposition is performed on the first signal to decompose the first signal into a plurality of first subband signals in the frequency domain.

Specifically, it may include: performing spectrum shifting on a preset low-pass filter; and filtering the first signal by using a plurality of frequency-shifted low-pass filters respectively. Through the above process, the first signal can be decomposed in the frequency domain to obtain a plurality of first subband signals, so that the first subband signals can be separated in the frequency domain. The above process is expressed as follows using formula (4):

以获得第m个抽取滤波器。其中，预设的低通滤波器可以是巴特沃斯滤波器、切比雪夫滤波器、椭圆函数滤波器和线性相位滤波器中的任一种，上述预设的低通滤波器分别对应通带内最平坦、通带内有等幅波纹起伏、通带和阻带内都有等幅波纹起伏、通带内有线性相位4种响应的情形。Wherein, x _i (t) is the first signal, and h _proto (t) is the preset low-pass filter. When the value of m changes, the preset low-pass filter is extracted according to the intermediate frequency interval. Perform spectrum shifting, that is, in the above formula (4)

to obtain the mth decimation filter. The preset low-pass filter may be any one of a Butterworth filter, a Chebyshev filter, an elliptic function filter, and a linear phase filter, and the preset low-pass filters correspond to passbands respectively. There are four types of responses: the flattest in the interior, the equal-amplitude ripple in the pass-band, the equal-amplitude ripple in the pass-band and the stop-band, and the linear phase in the pass-band.

Further, a plurality of decimation filters are used to filter the first signal to obtain a plurality of first subband signals, wherein the difference between the center frequencies of the adjacent first subband signals is equal and is a preset value ω ₀ , the center frequency of the m-th first subband signal is mω ₀ , the first signal is decomposed in the frequency domain through a decimation filter, so as to completely and orderly decompose the first signal into multiple first subband signals , reducing the spectral aliasing in the frequency band between the first subband signals.

Step S33: Perform down-sampling on the plurality of first sub-band signals, wherein the sampling interval of the down-sampling is less than or equal to the number of the plurality of first sub-band signals.

Specifically, the first sub-band signals are down-sampled respectively, so as to reduce the influence of signal redundancy, thereby reducing the amount of computation and improving the efficiency of signal processing. The above-mentioned step S33 is specifically expressed as follows using formula (5):

x _{i, m} (n)= _{xi, m} (t) | _t=n*D , n=0, 1, 2...(5)

Among them, the sampling interval of downsampling is D, the sampling interval D is less than the number of multiple first sub-band signals, and the number of sampling points is n, where the value of n is related to the signal attenuation of the first sub-band signal. A subband signal is downsampled until the signal decays to no sampling point.

In an implementation scenario, the sampling interval is half of the number of the first subband signals, so that the interval between sampling points is kept in a reasonable range, which can not only feedback the characteristics of the first subband signal but also greatly reduce the operation quantity.

In another implementation scenario, the sampling interval is equal to the number of the first subband signals, so as to expand the interval between sampling points, and reduce the amount of computation as much as possible on the basis of feeding back the characteristics of the first subband signals.

Step S34: Perform non-target signal cancellation on the first subband signal respectively to obtain a second subband signal. Wherein, the second subband signal retains at least part of the non-target signal.

Specifically, it may include: performing non-target signal cancellation on the down-sampled first subband signal. After the first subband signal is down-sampled, untargeted signal cancellation is performed on the first subband signal, that is, untargeted signal cancellation is performed on the signal corresponding to the sampling point, thereby improving processing efficiency.

Further, non-target signal elimination is performed on the first subband signal by using the reference beam filter corresponding to the first subband signal, wherein the part of the reference beam filter can refer to the above-mentioned step S13, and details are not repeated here. The above process is expressed as follows using formula (6):

y _{F, m} (n) = w _m ^T x _m (n) (6)

Wherein, x _m (n) is a signal matrix corresponding to a plurality of first subband signals, and x _m (n) specifically includes x _m (n)=[x _{0, m} (n),...x _{I-1, m} (n)] ^T , the reference beam filter corresponding to the first sub-band signal and the first sub-band signal are in one-to-one correspondence and filtered to obtain the second sub-band signal obtained after the first sub-band signal is eliminated from the non-target signal Band signal, wherein, the reference beam filter performs preliminary filtering on non-target signals in all directions to eliminate most of the interference signals in the relative position of the signal acquisition device and the target signal source, so that the target signal in the relative position direction is more accurate. Approaching the original signal sent by the target signal source, at the same time, the reference beam filter performs preliminary filtering on the non-target signal outside the relative position to eliminate part of the non-target signal to obtain the second subband signal. Some non-target signals still remain.

Step S35: Perform target signal cancellation on the second subband signal respectively to obtain a third subband signal.

Specifically, when there are still some non-target signals outside the relative position in the second sub-band signal, in order to obtain a purer target signal, theoretically, the target signal in the second sub-band signal is firstly eliminated to obtain The third sub-band signal, and then using the third sub-band signal to cancel part of the signal in the second sub-band signal can obtain a purer target signal.

In an implementation scenario, a blocking beam is designed, in which only the signals at the above-mentioned relative positions are suppressed, that is, the blocking beam is used to suppress the target signal. The second subband signal is processed by using the adaptive filter corresponding to each second subband signal and the above-mentioned blocking beam. When any second subband signal includes the target signal, the parameters of the adaptive filter corresponding to the corresponding second subband signal are fixed. Wherein, the initial parameter of the adaptive filter is set to 0, when any second subband signal does not include the target signal, the adaptive filter corresponding to the corresponding second subband signal is adaptively adjusted so as to be more Accurately track non-target signals.

Specifically, the above-mentioned process of using the adaptive filter corresponding to each second sub-band signal and the above-mentioned blocking beam to process the second sub-band signal is expressed as follows using formula (7):

y _{B, m} (n) = a _m ^T B _m ^T x _m (n) (7)

Among them, y _{B, m} (n) is the third sub-band signal, _{am is the adaptive filter corresponding to each second sub-band signal, B m is} the blocking beam, and x _m (n) is a plurality of second sub-band signals The signal matrix corresponding to the band signal. The second subband signals are processed respectively by using the adaptive filter a _m corresponding to each second subband signal and the blocking beam B _m to obtain a plurality of third subband signals. Since the target in the second subband signal The signal is suppressed by the blocking beam _Bm , therefore, only non-target signals are included in the third subband signal.

Further, when the above-mentioned any second subband signal does not include the target signal, the process of updating the adaptive filter corresponding to the corresponding second subband signal is expressed as follows using formula (8):

w _m ^T x _m (n) - a _m ^T B _m ^T x _m (n)→0 (8)

Wherein, when the target signal is not included in the second subband signal, in order to improve the accuracy of tracking the non-target signal, the adaptive filter am is adaptively adjusted, so that the second subband signal w _m ^T x _m ( _n ) and the third subband signal _am ^T B _m ^T x _m (n), the signal obtained by superimposing tends to zero.

Step S36: Synthesize the corresponding second subband signal and the third subband signal to obtain a fourth subband signal.

Specifically, the third sub-band signal is used to cancel part of the corresponding second sub-band signal to obtain the fourth sub-band signal, and then the fourth sub-band signal basically only includes the corresponding first sub-band signal in the sampling point on the target signal. The above process is expressed as follows using formula (9):

y _m (n)=y _{F, m} (n)-y _{B, m} (n) (9)

Among them, y _m (n) is the fourth subband signal, y _{F, m} (n) is the second subband signal obtained in formula (6), y _{B, m} (n) is obtained in formula (7) For the third subband signal, the third subband signal is inversely superimposed on the corresponding second subband signal to obtain a corresponding fourth subband signal.

It should be noted that, in the above step S35, updating the adaptive filter corresponding to the corresponding second subband signal is to perform adaptive adjustment on the third subband signal.

Specifically, the direction corresponding to the relative position of the signal acquisition device and the target signal source is set as the target direction. When the signal acquisition device receives the signal of the target signal source, most of the signals in the first signal will be concentrated in the target direction, That is, most of the signals in the first signal are target signals.

Further, for the decomposed first subband signal and the second subband signal obtained after processing the first subband signal, if the target signal is included in the first subband signal and the second subband signal, most of the signal All are concentrated in the target direction. If the frequency band corresponding to the first subband signal has no target signal, there is also no target signal in the corresponding second subband signal.

Specifically, the second subband signal is processed by using the adaptive filter corresponding to the second subband signal and the blocking beam to obtain the third subband signal, and the degree of coincidence between the second subband signal and the third subband signal is compared, If the target signal is included in the second subband signal, since the target signal is suppressed, the degree of coincidence between the second subband signal and the third subband signal will be very low. If the target signal is not included in the second subband signal, the The coincidence degree of the second subband signal and the third subband signal will be very high. When the coincidence degree of the second subband signal and the third subband signal reaches more than 90%, it is determined that the target signal is not included in the second subband signal.

Further, in response to the second sub-band signal not including the target signal, the above-mentioned step of respectively performing target signal cancellation on the second sub-band signal further includes: adaptively adjusting the third sub-band signal, so that the first sub-band signal is adaptively adjusted. When the subband signal does not have the target signal, the fourth subband signal tends to zero.

Specifically, please refer to the above formula (8) again, when the second subband signal does not include the target signal, in order to improve the accuracy of tracking the non-target signal, the adaptive filter _am is adaptively updated, so that the second subband signal does not include the target signal. The fourth sub-band signal obtained by superimposing the sub-band signal and the third sub-band signal tends to zero, so that when the target signal is not included in the second sub-band signal, the adaptive filter a _m has no effect on the non-target signal. Tracking works best.

Further, since the second subband signal is obtained by decomposing in the frequency domain, the frequency bands of the adaptive filters corresponding to the plurality of second subband signals are separated from each other when updating, which reduces the interference, the adaptive filter corresponding to each second subband signal does not need to uniformly update and stop all frequency bands, it only needs to stop updating when there is a target signal in the current second subband signal, and other second subbands If there is no target signal in the signal, it can be updated, so that the non-target signal can be tracked faster and the ability to suppress the non-target signal can be enhanced.

Step S37: Set the fourth subband signals corresponding to other first subband signals other than the sampling point to zero.

Specifically, when the first sub-band signal is down-sampled in the above step S33, before the fourth sub-band signal is synthesized, the fourth sub-band signal corresponding to the other first sub-band signals other than the sampling point Set to zero to ensure the integrity of the entire first subband signal, the above process is expressed as follows using formula (10):

Among them, the fourth sub-band signal at the sampling point t=n*D is obtained by superposing the second sub-band signal and the third sub-band signal in formula (9), using t≠n*D outside the point, the first The four subband signals are set to 0 to obtain the fourth subband signals of all points, ensuring the integrity of the corresponding first subband signals.

Step S38: Synthesize a plurality of fourth subband signals to obtain a second signal.

Specifically, it may include: using multiple frequency-shifted low-pass filters to filter the corresponding fourth subband signals respectively, thereby obtaining the second signal. The above process is expressed as follows using formula (11):

与公式4中每个第一子带信号对应的抽取滤波器相同，在上述步骤S37中，将采样点以外的其他第一子带信号所对应的第四子带信号设置为零，在获得第一子带信号对应的第四子带信号时，采样点之外的第四子带信号可能存在镜像的干扰信号，因此，再次利用多个频率搬移后的低通滤波器分别对对应的第四子带信号进行滤波，进而将获得的第四子带信号进行合成获得的第二信号，降低第二信号中目标信号的失真度，提高第二信号的精度。in,

The same as the decimation filter corresponding to each first subband signal in Equation 4, in the above step S37, the fourth subband signal corresponding to other first subband signals other than the sampling point is set to zero, after obtaining the first subband signal. When a sub-band signal corresponds to the fourth sub-band signal, the fourth sub-band signal outside the sampling point may have mirrored interference signals. Therefore, multiple frequency-shifted low-pass filters are used again to The sub-band signal is filtered, and then the obtained fourth sub-band signal is synthesized to obtain a second signal, so as to reduce the distortion degree of the target signal in the second signal and improve the accuracy of the second signal.

Further, please refer to FIG. 4. FIG. 4 is a schematic diagram of the framework of an embodiment corresponding to FIG. 3. When the signal acquisition device includes multiple signal acquisition units and acquires multiple first signals collected by the multiple signal acquisition units, then It is necessary to decompose a plurality of first signals respectively, and each first signal corresponds to a plurality of first subband signals, group the first subband signals according to their respective frequency bands, and then perform the first subband signals on the same frequency band. deal with.

In an implementation scenario, the signal acquisition device includes a plurality of signal acquisition units arranged in an array. The step of decomposing the first signal into a plurality of first subband signals in the frequency domain includes: decomposing the first signals corresponding to the plurality of signal acquisition units into a plurality of first subband signals respectively.

Specifically, please refer to FIG. 3 and FIG. 4 in combination, when 1 first signal is obtained, the 1 first signal is decomposed into M first subband signals respectively, and the M first subband signals corresponding to each first signal are The sub-band signals are classified according to the corresponding frequency bands to obtain I first sub-band signals corresponding to each frequency band, and then each first sub-band signal is down-sampled.

Further, before the step of performing non-target signal elimination on the first subband signals respectively, the method further includes: synthesizing a plurality of first subband signals with the same center frequency in the plurality of first signals into one first subband signal.

Specifically, after the corresponding first subband signals in each frequency band are classified into corresponding subbands, the first subband signals in each frequency band are synthesized to obtain the synthesized first subband corresponding to each frequency band. a subband signal, and then enter step S34 in FIG. 3 to complete the subsequent steps in FIG. 3 , and then obtain the second signal y(t).

It can be understood that, after obtaining the corresponding first subband signal on each frequency band, the first subband signal is synthesized and then processed for subsequent processing, which is beneficial to greatly reduce the signal processing accuracy in the application scenario where the accuracy of the signal processing is relatively low. The amount of computation increases the efficiency of signal processing.

In another implementation scenario, the signal acquisition device includes a plurality of signal acquisition units arranged in an array. The step of decomposing the first signal into a plurality of first subband signals in the frequency domain includes: decomposing the first signals corresponding to the plurality of signal acquisition units into a plurality of first subband signals respectively.

Specifically, please refer to FIG. 3 and FIG. 4 in combination, when 1 first signal is obtained, the 1 first signal is decomposed into M first subband signals respectively, and the M first subband signals corresponding to each first signal are The sub-band signals are classified according to the corresponding frequency bands to obtain I first sub-band signals corresponding to each frequency band, and then each first sub-band signal is down-sampled.

Further, in FIG. 3 , the step of respectively performing untargeted signal cancellation on the first subband signals includes: respectively performing untargeted signal cancellation on the first subband signals decomposed into the plurality of first signals.

Specifically, the non-target signal elimination is performed on the corresponding first subband signals in each frequency band, respectively, and then the subsequent steps in FIG. 3 are entered to process the first subband signals respectively.

Further, the step of synthesizing the plurality of fourth subband signals includes: synthesizing the fourth subband signals corresponding to the plurality of first signals.

Specifically, before outputting the corresponding fourth subband signal in each frequency band, the multiple fourth subband signals obtained after processing in the frequency band are synthesized to obtain a synthesized fourth subband signal y _m (t ), where m=0, 1, 2...M-1, that is, the first subband signals corresponding to each frequency band are processed separately, and then after multiple fourth subband signals are obtained, the Multiple fourth subband signals on each frequency band are synthesized to obtain a synthesized fourth subband signal, and then M fourth subband signals are synthesized to obtain a second signal y(t).

It can be understood that, after obtaining the first subband signal corresponding to each frequency band, the first subband signal corresponding to each frequency band is processed respectively to obtain a plurality of fourth subband signals. The fourth subband signal corresponding to the above is synthesized, and in the application scenario where the precision of the signal processing is high, it is beneficial to improve the precision of the signal processing, so that the target signal in the second signal is more pure.

In a specific implementation scenario, the signal collection device is a microphone array, and the microphone array includes a plurality of microphones arranged in an array. After acquiring the first signals collected by the multiple microphones, the first signals are processed in the manner in any of the above implementation scenarios, wherein the first signal is sound data, the target signal source is the target sound source, and the target signal is the target sound source data. The second signal is obtained after the first signal is processed accordingly, and the target signal in the first signal is further enhanced, so that the second signal mainly includes target sound data corresponding to the target sound source.

Please refer to FIG. 5 , which is a schematic diagram of a framework of an embodiment of an electronic device of the present application. The electronic device 50 includes a memory 51 and a processor 52 coupled to each other, the memory 51 stores program instructions, and the processor 52 is configured to execute the program instructions to implement the steps in any of the above signal processing method embodiments.

Specifically, the processor 52 is used to control itself and the memory 51 to implement the steps in any of the above signal processing method embodiments. The processor 52 may also be referred to as a CPU (Central Processing Unit, central processing unit). The processor 52 may be an integrated circuit chip with signal processing capability. The processor 52 may also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or other Programming logic devices, discrete gate or transistor logic devices, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. In addition, the processor 52 may be jointly implemented by a plurality of integrated circuit chips.

In this embodiment, the processor 52 is configured to acquire at least one first signal collected by the signal collection device; the processor 52 decomposes the first signal into multiple first subband signals in the frequency domain; The band signals have different center frequencies; the processor 52 respectively performs non-target signal cancellation on the first sub-band signal to obtain a second sub-band signal; wherein, the second sub-band signal retains at least part of the non-target signal; the processor 52 The second subband signal is respectively subjected to target signal cancellation to obtain the third subband signal; the processor 52 synthesizes the corresponding second subband signal and the third subband signal to obtain the fourth subband signal; the processor 52 synthesizes the plurality of fourth subband signals to obtain a second signal.

In the above scheme, the at least one first signal collected by the signal acquisition device is decomposed into a plurality of first subband signals with different center frequencies in the frequency domain, and the first subband signals are respectively subjected to non-target signal elimination to obtain some remaining non-target signals. The second subband signal of the target signal, and then the target signal cancellation is performed on the second subband signal to obtain a third subband signal, then the third subband signal is a signal other than the target signal in the second subband signal, Synthesize the corresponding second subband signal and the third subband signal to obtain a fourth subband signal, and obtain a second signal after synthesizing a plurality of fourth subband signals, so that the second signal mainly includes the target signal . Therefore, by decomposing the first signal into a plurality of first sub-band signals, and performing signal processing in units of the first sub-band signals, the spectral aliasing of the first sub-band signals in each frequency band is reduced, and the The mutual interference during signal processing among the multiple first subband signals improves the enhancement effect on the target signal in the second signal.

In some embodiments, the processor 52 is configured to perform spectrum shifting on the preset low-pass filter; the processor 52 is configured to filter the first signal respectively by using a plurality of frequency shifted low-pass filters.

Different from the foregoing embodiments, the preset low-pass filter is spectrally shifted to obtain extraction filters corresponding to different frequency bands, and the first signal is decomposed into a plurality of first subbands in a complete and orderly manner by the extraction filters. signal, reducing the spectral aliasing in the frequency band between the first subband signals.

In some embodiments, the processor 52 is configured to filter the corresponding fourth subband signals respectively by using a plurality of frequency shifted low-pass filters.

Different from the foregoing embodiments, the corresponding fourth subband signals are filtered by a plurality of frequency-shifted low-pass filters, and then the obtained fourth subband signals are synthesized to obtain the second signal, which reduces the second signal. The degree of distortion of the target signal in the signal.

In some embodiments, the processor 52 is used for down-sampling the plurality of first sub-band signals; wherein, the sampling interval of the down-sampling is less than or equal to the number of the plurality of first sub-band signals; the processor 52 is used for down-sampling The sampled first subband signal is subjected to non-target signal cancellation.

Different from the foregoing embodiments, the first sub-band signal is down-sampled, so that the sampled first sub-band signal can not only feed back the characteristics of the first sub-band signal, but also reduce the amount of computation and improve the efficiency of signal processing.

In some embodiments, the processor 52 is configured to set fourth subband signals corresponding to other first subband signals other than the sampling points to zero.

Different from the foregoing embodiments, the fourth subband signals corresponding to other first subband signals other than the sampling point are set to zero to ensure the integrity of the entire first subband signal and improve the accuracy of the signal.

In some embodiments, the processor 52 is configured to adaptively adjust the third sub-band signal, so that the fourth sub-band signal tends to zero when the target signal does not exist in the first sub-band signal.

Different from the foregoing embodiments, because the first signal is decomposed in the frequency domain, the frequency bands corresponding to the second sub-band signal obtained after processing are separated from each other, which reduces mutual interference, and the third sub-band signal is separated from each other. Adaptive adjustment of band signals does not require uniform updating and stopping of all frequency bands. The third sub-band signal corresponding to each frequency band can be adaptively adjusted, so that non-target signals can be tracked more quickly, and non-target signals can be enhanced and suppressed. Ability.

In some embodiments, the signal acquisition apparatus includes a plurality of signal acquisition units arranged in an array; the processor 52 is configured to respectively decompose the first signals corresponding to the plurality of signal acquisition units into a plurality of first subband signals; The processor 52 is configured to synthesize a plurality of first subband signals with the same center frequency in the plurality of first signals into one first subband signal.

Different from the foregoing embodiments, the first subband signal is synthesized and then processed for subsequent processing, which is beneficial to greatly reduce the amount of computation, improve the efficiency of signal processing, and has the advantage of faster processing speed in scenarios where signal processing accuracy is relatively low.

In some embodiments, the signal acquisition apparatus includes a plurality of signal acquisition units arranged in an array; the processor 52 is configured to respectively decompose the first signals corresponding to the plurality of signal acquisition units into a plurality of first subband signals; The processor 52 is configured to perform untargeted signal cancellation on the first subband signals decomposed into the multiple first signals respectively; the processor 52 is configured to synthesize the fourth subband signals corresponding to the multiple first signals.

Different from the foregoing embodiments, multiple first subband signals corresponding to the same frequency band are separately processed to obtain multiple fourth subband signals, and then multiple fourth subband signals corresponding to the same frequency band are synthesized to obtain multiple fourth subband signals. The synthesized fourth sub-band signal is obtained, and then the synthesized fourth sub-band signal is synthesized to obtain a second signal, so that the target signal in the second signal is more pure, which is suitable for high precision signal processing requirements. in application scenarios.

Please refer to FIG. 6 , which is a schematic diagram of a framework of an embodiment of the storage device of the present application. The storage device 60 stores program instructions 600 that can be executed by the processor, and the program instructions 600 are used to implement the steps in any of the above signal processing method embodiments.

The above solution can reduce the mutual interference between the first subband signals and improve the enhancement effect on the target signal in the second signal.

In the several embodiments provided in this application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the apparatus implementations described above are only illustrative, for example, the division of modules or units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this implementation manner.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

Claims (10)

1. A method of signal processing, the method comprising:

acquiring at least one first signal acquired by a signal acquisition device;

decomposing the first signal into a plurality of first subband signals in the frequency domain; wherein the plurality of first subband signals have different center frequencies;

respectively carrying out non-target signal elimination on the first sub-band signals to obtain second sub-band signals; wherein the second subband signal is reserved with at least part of non-target signals;

respectively carrying out target signal elimination on the second sub-band signals to obtain third sub-band signals;

synthesizing the corresponding second sub-band signal and the third sub-band signal to obtain a fourth sub-band signal;

synthesizing a plurality of said fourth subband signals to obtain a second signal.

2. The method of claim 1, wherein the step of decomposing the first signal into a plurality of first subband signals in the frequency domain comprises:

carrying out frequency spectrum shifting on a preset low-pass filter;

and filtering the first signal by using the low-pass filters with shifted frequencies respectively.

3. The method according to claim 2, wherein said step of synthesizing a plurality of said fourth subband signals comprises:

and filtering the corresponding fourth sub-band signals by using the plurality of frequency-shifted low-pass filters.

4. The method of claim 1, wherein the step of performing non-target signal cancellation on the first subband signals respectively further comprises:

down-sampling the plurality of first subband signals; wherein a sampling interval of the downsampling is less than or equal to a number of the plurality of first subband signals;

the step of performing non-target signal cancellation on the first subband signals respectively comprises:

and carrying out non-target signal elimination on the first sub-band signal after down sampling.

5. The method of claim 4, wherein the step of synthesizing the plurality of fourth subband signals is preceded by the step of:

and setting the fourth sub-band signals corresponding to the first sub-band signals except the sampling points to be zero.

6. The method of claim 1, wherein the step of performing target signal cancellation on the second subband signals respectively comprises:

adaptively adjusting the third subband signal such that the fourth subband signal tends to be zero in the absence of the target signal from the first subband signal.

7. The method of claim 1, wherein the signal acquisition device comprises a plurality of signal acquisition units arranged in an array;

the step of decomposing the first signal into a plurality of first subband signals in the frequency domain comprises:

decomposing the first signals corresponding to the plurality of signal acquisition units into a plurality of first sub-band signals respectively;

before the step of performing non-target signal cancellation on the first subband signals respectively, the method further includes:

and synthesizing a plurality of first sub-band signals with the same center frequency in a plurality of first signals into one first sub-band signal.

8. The method of claim 1, wherein the signal acquisition device comprises a plurality of signal acquisition units arranged in an array;

the step of decomposing the first signal into a plurality of first subband signals in the frequency domain comprises:

decomposing the first signals corresponding to the plurality of signal acquisition units into a plurality of first sub-band signals respectively;

the step of performing non-target signal cancellation on the first subband signals respectively comprises:

performing non-target signal cancellation on the first subband signals into which the plurality of first signals are decomposed, respectively;

said step of synthesizing a plurality of said fourth subband signals comprises:

and synthesizing the fourth sub-band signals corresponding to the plurality of first signals.

9. An electronic device, comprising a memory and a processor coupled to each other, wherein the memory stores program instructions, and the processor is configured to execute the program instructions to implement the signal processing method according to any one of claims 1 to 8.

10. A storage device, characterized by program instructions executable by a processor for implementing the signal processing method of any one of claims 1 to 8.

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