CN117198264A - Active noise reduction processing method, system, readable storage medium and computer equipment - Google Patents
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Abstract
The application provides an active noise reduction processing method, an active noise reduction processing system, a readable storage medium and computer equipment, wherein the method comprises the following steps: acquiring a first audio signal of a current environment and a second audio signal of the first audio signal subjected to physical sound insulation in real time; sequentially amplifying and converting the first audio signal and the second audio signal to obtain a first digital audio signal and a second digital audio signal; combining the first digital audio signal and the second digital audio signal to obtain a combined audio signal; and performing noise suppression and elimination processing on the combined audio signal to obtain a target audio signal meeting the requirements. According to the application, the feedforward control loop is utilized to perform acoustic wave interference cancellation on the first audio signal, and feedback control is performed on the second audio signal, so that stable balance is realized, and the two audio signals are summarized and comprehensively operated, so that the cancellation of waves opposite to noise is calculated, and the effect of noise reduction is achieved.
Description
Technical Field
The present application relates to the field of audio signal processing technologies, and in particular, to an active noise reduction processing method, an active noise reduction processing system, a readable storage medium, and a computer device.
Background
With the rapid development of technology and the improvement of the comprehensive level of high-technology informatization, the demand for video/audio services has been exponentially increasing. When people are doing video/audio services, for example: headphones are often worn for voice calls, video calls, listening to music, etc., and as the usage of headphones increases, the audio optimization effect of headphones becomes more and more important.
When people wear headphones to carry out video/audio service, if people are in a noisy environment, the use comfort of the video/audio service can be affected, in the prior art, noise control technology comprises two control methods of sound insulation and noise reduction, along with development of electronic technology, noise reduction technology is mature gradually, the current noise reduction technology mainly adopts a feedforward active noise reduction mode, noise signals picked up by feedforward microphones are filtered and phase-shifted to obtain anti-phase signals, voltage signals after power amplification are converted into sound pressure through receivers, and the sound pressure and primary noise sound pressure are destructively interfered with each other in a noise reduction space, so that a noise suppression area is formed, and the effects of noise reduction or noise reduction are achieved.
As known from the feedforward control principle, the gain and the frequency bandwidth of the amplifier are determined once designed, so that the effective amplitude and the effective frequency range of the sound wave restored by the receiver are fixed, the effective amplitude and the proper frequency range of the noise are reduced, namely, the effective amplitude and the effective frequency range of the noise are fixed, and the noise reduction effect is influenced after the amplitude or the frequency of the noise is changed. Therefore, the scheme is only suitable for the occasion that the noise amplitude and the frequency are relatively stable. For noise source noise characteristics change greatly or random noise environment, noise reduction effect is easy to be poor or system is easy to be disturbed in a runaway way.
Disclosure of Invention
Based on this, an object of the present application is to provide an active noise reduction processing method, system, readable storage medium and computer device, so as to at least solve the above-mentioned disadvantages in the related art.
The application provides an active noise reduction processing method, which comprises the following steps:
acquiring a first audio signal of a current environment and a second audio signal of the first audio signal subjected to physical sound insulation in real time;
sequentially amplifying and converting the first audio signal and the second audio signal to obtain a first digital audio signal and a second digital audio signal;
combining the first digital audio signal and the second digital audio signal to obtain a combined audio signal;
and performing noise suppression and elimination processing on the combined audio signal to obtain a target audio signal meeting the requirements.
Further, the step of sequentially amplifying and converting the first audio signal and the second audio signal to obtain a first digital audio signal and a second digital audio signal includes:
the first audio signal is subjected to signal amplification through a PGA amplifier, and the second audio signal is subjected to error amplification through the PGA amplifier;
the first audio signal after signal amplification and the second audio signal after error amplification are respectively subjected to digital-to-analog conversion to obtain a first digital audio signal and a second digital audio signal.
Further, the step of performing noise suppression cancellation processing on the combined audio signal includes:
filtering the combined audio signal, and performing phase compensation on the filtered combined audio signal to obtain a compensated combined audio signal;
and carrying out power amplification on the compensated combined audio signal, and carrying out noise elimination on the combined audio signal subjected to power amplification so as to obtain the target audio signal.
Further, the calculation formula for performing filtering processing on the combined audio signal is as follows:
；
；
wherein E (Z) represents the second digital audio signal, Y (Z) is the signal generated by the filter, S (Z) represents the filter parameters, Z represents the domain,the reference input representing the ambient noise as a filter, d (n) representing the output timing signal, c (n) representing the input time domain signal, sm being the coefficient of the M-order FIR filter, y (n-M) representing the time domain delay signal, and n representing time.
Further, the step of performing noise cancellation on the power amplified combined audio signal includes:
outputting an inverted signal based on the power amplified combined audio signal, and performing inverted superposition on the inverted signal and the power amplified combined audio signal to reduce noise of the power amplified combined audio signal.
The application also provides an active noise reduction processing system, which comprises:
the audio signal acquisition module is used for acquiring a first audio signal of the current environment and a second audio signal of the first audio signal after physical sound insulation in real time;
the first processing module is used for sequentially amplifying and converting the first audio signal and the second audio signal to obtain a first digital audio signal and a second digital audio signal;
the signal combination module is used for combining the first digital audio signal and the second digital audio signal to obtain a combined audio signal;
and the noise suppression module is used for performing noise suppression and elimination processing on the combined audio signal so as to obtain a target audio signal meeting the requirements.
Further, the first processing module includes:
an audio signal processing unit for amplifying the first audio signal by a PGA amplifier and amplifying the second audio signal by an error by the PGA amplifier;
the digital-to-analog conversion unit is used for respectively carrying out digital-to-analog conversion on the first audio signal after signal amplification and the second audio signal after error amplification so as to obtain a first digital audio signal and a second digital audio signal.
Further, the noise suppression module includes:
the phase compensation unit is used for carrying out filtering processing on the combined audio signal and carrying out phase compensation on the filtered combined audio signal so as to obtain a compensated combined audio signal;
and the noise elimination unit is used for carrying out power amplification on the compensated combined audio signal and carrying out noise elimination on the combined audio signal subjected to power amplification so as to obtain the target audio signal.
Further, the noise cancellation unit is further configured to:
outputting an inverted signal based on the power amplified combined audio signal, and performing inverted superposition on the inverted signal and the power amplified combined audio signal to reduce noise of the power amplified combined audio signal.
The application also proposes a readable storage medium having stored thereon a computer program which, when executed by a processor, implements the active noise reduction processing method described above.
The application also provides a computer device which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the active noise reduction processing method when executing the computer program.
Compared with the prior art, the application has the beneficial effects that: picking up external environmental noise, namely a first audio signal, performing physical sound insulation on the first audio signal to obtain a second audio signal, performing signal amplification and signal conversion processing on the acquired first audio signal and the second audio signal to obtain corresponding digital audio signals, combining the two digital audio signals, and performing noise suppression and elimination on the combined audio signals to achieve the effect of noise reduction; specifically, the feedforward control loop is utilized to perform acoustic wave interference cancellation on the first audio signal, and feedback control is performed on the second audio signal, so that stable balance is realized, and the two audio signals are summarized and comprehensively operated, so that the cancellation of waves opposite to noise is calculated, and the noise reduction effect is achieved.
Drawings
FIG. 1 is a flowchart of an active noise reduction processing method according to a first embodiment of the present application;
FIG. 2 is a detailed flowchart of step S102 in FIG. 1;
FIG. 3 is a schematic diagram illustrating an overall scheme of an active noise reduction method according to a first embodiment of the present application;
FIG. 4 is a detailed flowchart of step S104 in FIG. 1;
FIG. 5 is a diagram of a filter according to a first embodiment of the present application;
fig. 6 is a block diagram of an FIR filter according to the first embodiment of the present application;
FIG. 7 is a block diagram illustrating an active noise reduction processing system according to a second embodiment of the present application;
fig. 8 is a block diagram showing the construction of a computer device according to a third embodiment of the present application.
The application will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Several embodiments of the application are presented in the figures. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, an active noise reduction processing method according to a first embodiment of the present application is shown, and the method specifically includes steps S101 to S104:
s101, acquiring a first audio signal of a current environment and a second audio signal of the first audio signal subjected to physical sound insulation in real time;
the active noise reduction is also called Active Noise Control (ANC) technology, and is based on the principle of destructive interference of sound waves or suppression of sound wave radiation, and a control circuit is used for generating a secondary sound source with the same size and opposite phase to the noise to be counteracted (primary sound source) in a noise reduction space (auditory canal) and the primary noise source interfere with each other in the noise reduction space, so that the purpose of eliminating or reducing noise in the noise reduction space is achieved.
The embodiment is applied to an active noise reduction earphone, two small sound pickups (namely a feedforward microphone and a feedback microphone) are designed and installed at the rear cavity of an eardrum and the entrance of an auditory canal of the active noise reduction earphone, the feedforward microphone picks up external environmental noise, and acoustic wave interference cancellation is carried out in the auditory canal through a feedforward control loop; the feedback microphone picks up the error sound signal after interference cancellation, and feedback control is performed to realize stable balance. The two sound pick-up devices play roles at the same time, so that noise, especially low intermediate frequency noise, is eliminated;
the active noise reduction earphone is characterized in that a sound insulation cavity for physical sound insulation is further formed in the active noise reduction earphone, the feedback microphone is arranged in the sound insulation cavity, the noise value of a first audio signal can be primarily reduced through the sound insulation cavity, then the full-frequency-band noise in the auditory canal is reduced, when the active noise reduction earphone is in specific implementation, the feedforward microphone is utilized to acquire a noise signal (namely, the first audio signal) in the current environment in real time, and the feedback microphone is utilized to acquire a primary noise signal (namely, the second audio signal) after the first audio signal is subjected to physical sound insulation through the sound insulation cavity in real time.
S102, respectively carrying out signal amplification and signal conversion processing on the first audio signal and the second audio signal in sequence to obtain a first digital audio signal and a second digital audio signal;
further, referring to fig. 2, the step S102 specifically includes steps S1021 to S1022:
s1021, amplifying the first audio signal through a PGA amplifier, and amplifying the second audio signal through a PGA amplifier;
s1022, the first audio signal after signal amplification and the second audio signal after error amplification are respectively subjected to digital-to-analog conversion to obtain a first digital audio signal and a second digital audio signal.
In specific implementation, as shown in fig. 3, the first audio signal is amplified by the PGA amplifier, and the first audio signal after the signal amplification is converted into a digital signal, i.e., a first digital audio signal by digital-to-analog conversion (D/a);
meanwhile, the second audio signal is subjected to error amplification through the PGA amplifier, the signal meeting the noise requirement in the second audio signal is amplified, the second audio signal after the signal amplification is converted into a digital signal through digital-to-analog conversion (D/A), namely, the second digital audio signal, and the audio signal is converted into the digital signal, so that the feedforward and feedback circuit can conveniently process the audio signal.
S103, combining the first digital audio signal and the second digital audio signal to obtain a combined audio signal;
in a specific implementation, the digital audio signals obtained above are combined to obtain combined audio data, so that noise suppression processing is performed on the combined audio signals.
S104, performing noise suppression and elimination processing on the combined audio signal to obtain a target audio signal meeting the requirements.
Further, referring to fig. 4, the step S104 specifically includes steps S1041 to S1042:
s1041, performing filtering processing on the combined audio signal, and performing phase compensation on the filtered combined audio signal to obtain a compensated combined audio signal;
s1042, power amplifying the compensated combined audio signal, and noise eliminating the power amplified combined audio signal to obtain the target audio signal.
In the active noise reduction system, a combination of digital-to-analog (D/a), signal method circuits, analog-to-digital (a/D), filter circuits, electronic devices such as a receiver and a microphone, and physical channels such as an actual pipe between the receiver and the microphone is called a secondary channel. An adaptive filter in the active noise reduction system estimates the secondary channel. When the transfer function is a time-varying function, an online identification algorithm is adopted, namely, the secondary channel is estimated while the active noise reduction system is running. The output of the adaptive filter is introduced into the line identification system as input to the LMS algorithm. Meanwhile, comparing the values obtained after the residual noise signals in the system are estimated by the secondary channel, using the obtained errors as excitation of an LMS algorithm, adjusting parameters, continuously approaching the transfer function of the secondary channel, and completing real-time online identification of the secondary channel;
in the implementation, the receiver and the pickup are arranged in the earphone in a short distance, normal sound signals can directly enter the receiver, the pickup collects sound signals which are normally played and environmental noise signals which penetrate through the earphone and enter human ears, the sound signals are fed back to the digital filter G with gain and phase compensation functions, if the digital filter G is adopted singly, the low-frequency part of the sound signals is damaged, and therefore the filter M capable of carrying out gain compensation is added, and signals generated by the filter G are real reverse signals of the environmental noise. The filter is an adaptive filter, and can automatically filter out relevant signals in input by adjusting impulse response according to any signals or noise, and has the capability of adaptive signal processing under unsteady state conditions.
Adaptive filter model as shown in fig. 5, the ambient noise is expressed in the Z-domain as the reference input x (n) of the filter:
wherein E (Z) represents an audio signal (second digital audio signal) in the earphone collected by the pickup, S (Z) represents a filter parameter, Z represents a domain, Y (Z) is a signal generated by the filter, and an x (n) reference signal can be synthesized by using FXLMS algorithm:
where Sm is the coefficient of the M-order FIR filter,the reference input of the filter is represented by ambient noise, d (n) represents the output timing signal, c (n) represents the input time domain signal, y (n-m) represents the time domain delay signal, and n represents time.
The implementation of the FIR filter mainly comprises three components of a delay unit, a multiplier and an adder, as shown in fig. 6:
in the active noise reduction method, besides the self-adaptive filtering algorithm, a protection mechanism is added, so that stability is enhanced. In this embodiment, the effect of noise reduction in a period of time is automatically analyzed and evaluated, the currently used digital filter parameters are backed up, if the noise reduction effect is better than that in the previous period of time in the next stage, the stored filter parameters are automatically updated, if the effect is poor, the stored parameters are reloaded, and if the noise reduction effect is poor for a long period of time, the current filter parameters are reset and reset.
The embodiment adopts a feedforward and feedback mixed mode active noise reduction (ANC) control technology, and based on the principle of sound wave destructive interference or sound wave radiation inhibition, utilizes an additional secondary sound source to generate a control sound field to interact with the original noise field so as to reduce the space noise.
In this embodiment, after the mic_ff (feedforward microphone) picks up the environmental noise, the environmental noise is conditioned and filtered and amplified by the PGA, and then output by the receiver through power amplification, and the noise is superimposed with the environmental noise sound wave in the ear shell cavity in an inverted manner, so as to form a noise reduction sound field, and realize an active noise reduction function, which is feedforward control.
Furthermore, in order to obtain the noise reduction effects of high volume, wide frequency range, high response speed and high stability, the feedforward and feedback dual-mode control circuit is adopted for realizing. The feedback control loop picks up the noise-reduced sound signal by MIC_FB (feedback microphone), and after filtering and error amplification, the noise-reduced sound signal is fed back to the signal processor for self-adaptive processing to form closed-loop control, so that the efficient, broadband, stable and reliable noise reduction function is realized, and the optimal noise reduction effect is achieved.
Referring to fig. 3, in this embodiment, ambient noise is transmitted into the rear cavity of the earphone through the damping hole, the echo hole, the sound guiding hole and the ABS sound insulation structure of the bottom shell of the earphone, the feedforward Mic picks up the mixed sound wave signal, performs amplitude self-adaptive adjustment processing through AGC amplification, then performs programmable amplification (PGA) to implement user programming debugging, then performs phase compensation on the processed signal through a filter network to enable the phase of the signal in the frequency range of 200 Hz-4 KHz to meet the requirements of ANC control (phase opposition), and the normalized signal is reduced to a sound wave with the amplitude approximately equal to and phase approximately opposite to that of the noise sound wave transmitted to the front cavity of the earphone through the SPK after power amplification, so that the noise cancellation or attenuation is achieved.
After the subtracted front cavity sound wave is picked up by the feedback Mic, noise is further subtracted by the AGC, PGA, error amplification, phase compensation, mixed superposition and power amplification and then sent to the SPK, and stable closed-loop control is achieved, and the feedback control can realize the active noise reduction performance of 50 Hz-800 Hz.
The embodiment is realized by adopting a feedforward and feedback dual-mode control circuit. In the mixed noise reduction mode, noise can be suppressed in a wider frequency range and errors can be corrected, and the noise reduction effects of high volume, wide frequency range, high response speed and high stability can be obtained. The MIC_FF picks up the environmental noise, the processed signal is amplified by the adder and then reduced by the SPK to sound waves with the amplitude approximately equal to and the phase approximately opposite to that of the noise sound wave transmitted to the front cavity of the earphone, so that the sound waves are added with the noise sound wave transmitted to the front cavity of the earphone, and the purpose of canceling or weakening the noise is achieved. After conditioning, filtering and amplifying by PGA, the noise-reducing sound field is formed by outputting by a receiver through power amplification and reversely superposing the noise-reducing sound field with the environmental noise sound wave in the cavity of the ear shell, and the active silencing function is realized, which is feedforward control. The feedback control loop picks up the noise-reduced sound signal by MIC_FB, and after filtering and error amplification, the noise-reduced sound signal is fed back to the signal processor for self-adaptive processing to form closed-loop control, so that the efficient, broadband, stable and reliable noise reduction function is realized, and the optimal noise reduction effect is achieved.
In summary, in the active noise reduction processing method in the above embodiment of the present application, external environmental noise, that is, a first audio signal is picked up, and the first audio signal is subjected to physical sound insulation to obtain a second audio signal, and the obtained first audio signal and second audio signal are subjected to signal amplification and signal conversion processing to obtain corresponding digital audio signals, and the two digital audio signals are combined, and noise suppression and cancellation are performed on the combined audio signals, so as to achieve the noise reduction effect; specifically, the feedforward control loop is utilized to perform acoustic wave interference cancellation on the first audio signal, and feedback control is performed on the second audio signal, so that stable balance is realized, and the two audio signals are summarized and comprehensively operated, so that the cancellation of waves opposite to noise is calculated, and the noise reduction effect is achieved.
Example two
In another aspect, referring to fig. 7, an active noise reduction processing system according to a second embodiment of the present application is shown, where the system includes:
the audio signal acquisition module 11 is configured to acquire, in real time, a first audio signal of a current environment and a second audio signal of the first audio signal after physical sound insulation;
a first processing module 12, configured to sequentially perform signal amplification and signal conversion processing on the first audio signal and the second audio signal, so as to obtain a first digital audio signal and a second digital audio signal;
further, the first processing module 12 includes:
an audio signal processing unit for amplifying the first audio signal by a PGA amplifier and amplifying the second audio signal by an error by the PGA amplifier;
the digital-to-analog conversion unit is used for respectively carrying out digital-to-analog conversion on the first audio signal after signal amplification and the second audio signal after error amplification so as to obtain a first digital audio signal and a second digital audio signal.
A signal combination module 13, configured to combine the first digital audio signal and the second digital audio signal to obtain a combined audio signal;
and the noise suppression module 14 is used for performing noise suppression and elimination processing on the combined audio signal so as to obtain a target audio signal meeting requirements.
Further, the noise suppression module 14 includes:
the phase compensation unit is used for carrying out filtering processing on the combined audio signal and carrying out phase compensation on the filtered combined audio signal so as to obtain a compensated combined audio signal;
and the noise elimination unit is used for carrying out power amplification on the compensated combined audio signal and carrying out noise elimination on the combined audio signal subjected to power amplification so as to obtain the target audio signal.
In some alternative embodiments, the noise cancellation unit is further configured to:
outputting an inverted signal based on the power amplified combined audio signal, and performing inverted superposition on the inverted signal and the power amplified combined audio signal to reduce noise of the power amplified combined audio signal.
The functions or operation steps implemented when the above modules and units are executed are substantially the same as those in the above method embodiments, and are not described herein again.
The active noise reduction processing system provided by the embodiment of the present application has the same implementation principle and technical effects as those of the foregoing method embodiment, and for brevity, reference may be made to the corresponding content in the foregoing method embodiment where the system embodiment portion is not mentioned.
Example III
The present application also proposes a computer device, referring to fig. 8, which shows a computer device according to a third embodiment of the present application, including a memory 10, a processor 20, and a computer program 30 stored in the memory 10 and capable of running on the processor 20, where the processor 20 implements the active noise reduction processing method when executing the computer program 30.
The memory 10 includes at least one type of readable storage medium including flash memory, a hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc. Memory 10 may in some embodiments be an internal storage unit of a computer device, such as a hard disk of the computer device. The memory 10 may also be an external storage device in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), etc. Further, the memory 10 may also include both internal storage units and external storage devices of the computer apparatus. The memory 10 may be used not only for storing application software installed in a computer device and various types of data, but also for temporarily storing data that has been output or is to be output.
The processor 20 may be, in some embodiments, an electronic control unit (Electronic Control Unit, ECU), a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor, or other data processing chip, for executing program codes or processing data stored in the memory 10, such as executing an access restriction program, or the like.
It should be noted that the structure shown in fig. 8 does not constitute a limitation of the computer device, and in other embodiments, the computer device may include fewer or more components than shown, or may combine certain components, or may have a different arrangement of components.
The embodiment of the application also provides a readable storage medium, on which a computer program is stored, which when executed by a processor implements the active noise reduction processing method as described above.
Those of skill in the art will appreciate that the logic and/or steps represented in the flow diagrams or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. An active noise reduction processing method is characterized by comprising the following steps:
acquiring a first audio signal of a current environment and a second audio signal of the first audio signal subjected to physical sound insulation in real time;
sequentially amplifying and converting the first audio signal and the second audio signal to obtain a first digital audio signal and a second digital audio signal;
combining the first digital audio signal and the second digital audio signal to obtain a combined audio signal;
and performing noise suppression and elimination processing on the combined audio signal to obtain a target audio signal meeting the requirements.
2. The active noise reduction processing method according to claim 1, wherein the step of sequentially performing signal amplification and signal conversion processing on the first audio signal and the second audio signal, respectively, to obtain a first digital audio signal and a second digital audio signal comprises:
the first audio signal is subjected to signal amplification through a PGA amplifier, and the second audio signal is subjected to error amplification through the PGA amplifier;
the first audio signal after signal amplification and the second audio signal after error amplification are respectively subjected to digital-to-analog conversion to obtain a first digital audio signal and a second digital audio signal.
3. The active noise reduction processing method according to claim 1, wherein the step of performing noise suppression cancellation processing on the combined audio signal includes:
filtering the combined audio signal, and performing phase compensation on the filtered combined audio signal to obtain a compensated combined audio signal;
and carrying out power amplification on the compensated combined audio signal, and carrying out noise elimination on the combined audio signal subjected to power amplification so as to obtain the target audio signal.
4. The active noise reduction processing method according to claim 3, wherein a calculation formula for performing the filtering processing on the combined audio signal is:
；
；
wherein E (Z) represents the second digital audio signal, Y (Z) is the signal generated by the filter, S (Z) represents the filter parameters, Z represents the domain,the reference input representing the ambient noise as a filter, d (n) representing the output timing signal, c (n) representing the input time domain signal, sm being the coefficient of the M-order FIR filter, y (n-M) representing the time domain delay signal, and n representing time.
5. The active noise reduction processing method according to claim 3, wherein the step of noise canceling the power amplified combined audio signal comprises:
outputting an inverted signal based on the power amplified combined audio signal, and performing inverted superposition on the inverted signal and the power amplified combined audio signal to reduce noise of the power amplified combined audio signal.
6. An active noise reduction processing system, comprising:
the audio signal acquisition module is used for acquiring a first audio signal of the current environment and a second audio signal of the first audio signal after physical sound insulation in real time;
the first processing module is used for sequentially amplifying and converting the first audio signal and the second audio signal to obtain a first digital audio signal and a second digital audio signal;
the signal combination module is used for combining the first digital audio signal and the second digital audio signal to obtain a combined audio signal;
and the noise suppression module is used for performing noise suppression and elimination processing on the combined audio signal so as to obtain a target audio signal meeting the requirements.
7. The active noise reduction processing system of claim 6, wherein the first processing module comprises:
an audio signal processing unit for amplifying the first audio signal by a PGA amplifier and amplifying the second audio signal by an error by the PGA amplifier;
the digital-to-analog conversion unit is used for respectively carrying out digital-to-analog conversion on the first audio signal after signal amplification and the second audio signal after error amplification so as to obtain a first digital audio signal and a second digital audio signal.
8. The active noise reduction processing system of claim 6, wherein the noise suppression module comprises:
the phase compensation unit is used for carrying out filtering processing on the combined audio signal and carrying out phase compensation on the filtered combined audio signal so as to obtain a compensated combined audio signal;
and the noise elimination unit is used for carrying out power amplification on the compensated combined audio signal and carrying out noise elimination on the combined audio signal subjected to power amplification so as to obtain the target audio signal.
9. A readable storage medium having stored thereon a computer program, which when executed by a processor implements the active noise reduction processing method according to any one of claims 1 to 5.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the active noise reduction processing method according to any of claims 1 to 5 when executing the computer program.
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