CN112954547A - Active noise reduction method, system and storage medium thereof - Google Patents
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Abstract
The application relates to a method, a system and a storage medium thereof for active noise reduction, wherein the method comprises the steps of establishing data connection between a first computing end with an audio acquisition module and a second computing end connected with an audio player; acquiring a noise audio signal in a preset space through a first calculation end, analyzing and processing the noise audio signal, and generating a noise reduction signal which has the same frequency and amplitude as those of the noise audio signal and has a phase difference of 180 degrees and is used for suppressing noise from the noise audio signal; and transmitting the noise reduction signal to a second computing end, and playing the noise reduction signal and the audio signal to be played through an audio player after the second computing end is coupled with the noise reduction signal. The method and the device have the advantages that transmission delay is reduced, noise generated after calculation and used for offsetting the noise is well offset and changed in real time, and therefore the effect of active noise reduction is improved.
Description
Technical Field
The present application relates to the field of noise reduction, and in particular, to an active noise reduction method, system and storage medium thereof.
Background
At present, noise of an automobile mainly comes from road noise, tire noise, wind noise, engine noise and the like, noise control in an automobile compartment is an important part in automobile technology, noise, vibration and harshness (NVH) is called NVH for short, and is a comprehensive problem for measuring automobile manufacturing quality, and the noise is most direct and surface to automobile users. The NVH problem of vehicles is one of the concerns of various large vehicle manufacturing enterprises and component enterprises in the international automotive industry.
The existing noise suppression in the automobile compartment is mainly realized by improving the sealing performance of the compartment, a damping system of a chassis, the sound insulation effect of an engine compartment, a silent tire and the like. The above techniques all belong to passive noise reduction techniques, which can reduce the noise decibels in the vehicle cabin, but the noise reduction degree is limited, and especially when the automobile runs at high speed, the noise in the vehicle cabin is still strong. The existing noise improvement means are passive noise reduction, the noise frequency band for noise reduction is limited, and the noise reduction of a wide frequency band cannot be realized, so that an active noise reduction technology is generated. The existing active noise reduction technology is to utilize a second computing end with a collecting microphone, such as a mobile phone in a vehicle, to collect noise audio, and then use a preset player to play sound waves for canceling noise according to the noise audio, so as to realize active noise reduction.
For the above related technologies, the inventor thinks that there are a plurality of APPs running simultaneously in the background of the second computing terminal having the collecting microphone, such as a mobile phone in a vehicle, and the second computing terminal having the collecting microphone, such as a mobile phone, is not a system with strictly managed program time allocation, so that transmission delay is caused between sound collection and sound transmission due to thread blockage or process blockage of other codes, and if the transmission delay is caused, the sound wave generated by the preset player to cancel the noise cannot well cancel the noise changing in real time, so the active noise reduction effect needs to be improved.
Disclosure of Invention
In order to reduce the decrease of the active noise reduction effect caused by the transmission delay of sound collection ends such as mobile phones, the application provides an active noise reduction method, an active noise reduction system and a storage medium thereof.
In a first aspect, the present application provides an active noise reduction method, which adopts the following technical scheme:
a method of active noise reduction comprising the steps of:
establishing data connection between a first computing end with an audio acquisition module and a second computing end connected with an audio player;
acquiring a noise audio signal in a preset space through a first calculation end, analyzing and processing the noise audio signal, and generating a noise reduction signal which has the same frequency and amplitude as those in the noise audio signal and has a phase difference of 180 degrees and is used for suppressing noise from the noise audio signal; and the number of the first and second groups,
transmitting the noise reduction signal to the second computing terminal, wherein the first computing terminal computes the noise reduction signal into a first differential signal and a second differential signal through a differential algorithm, the first differential signal and the second differential signal are restored through simple operation to obtain the noise reduction signal, the first differential signal and the second differential signal are wirelessly transmitted to the second computing terminal through two frequency channels, and the second computing terminal restores the noise reduction signal after receiving the first differential signal and the second differential signal; and the number of the first and second groups,
and the second computing terminal is coupled with the noise reduction signal and the audio signal to be played and then plays the audio signal through an audio player.
By adopting the technical scheme, under the normal condition, the number of the APP running in the background of the first computing end is far smaller than that of the APP running in the background of the second computing end, so that the utilization rate of the computing resources of the background of the first computing end is also far smaller than that of the computing resources of the background of the second computing end. The method comprises the steps that an audio acquisition module of a first computing end is utilized, a microphone on the audio acquisition module acquires noise inside a preset space, a processor of the first computing end is utilized for processing, a noise reduction signal is obtained through calculation, the noise reduction signal is sent to a second computing end, the second computing end plays the noise through an audio player, the second computing end does not need to acquire the audio and calculate, and therefore transmission delay caused by thread blockage or process blockage of other codes except a noise reduction algorithm of the second computing end between sound acquisition and sound sending of the second computing end is reduced, transmission delay is reduced, noise waves for offsetting the noise generated after calculation can well offset noise changing in real time, and therefore the active noise reduction effect is improved. The noise reduction signal is calculated into a first differential signal and a second differential signal through a differential algorithm, so that the anti-electromagnetic interference performance of the noise reduction signal can be improved when the noise reduction signal is transmitted by using two channels, the wireless transmission accuracy is improved, the signal transmitted by the channels can be more fidelity, the loss degree of the noise reduction signal is reduced, and the noise reduction effect is improved.
Preferably, the method further comprises:
detecting the number of background running processes of a first computing end and the number of background running processes of a second computing end, and sending the number of the background running processes of the second computing end to the first computing end by the second computing end;
if the number of the background running processes of the first computing end is larger than that of the background running processes of the second computing end, the first computing end analyzes and processes half-segment signals in the noise audio signals to obtain first noise reduction sub-signals;
the first computing terminal sends the remaining half-segment signals in the noise audio signals to the second computing terminal, the second computing terminal analyzes and processes the received remaining half-segment signals to obtain second noise reduction sub-signals, and the first noise reduction sub-signals are transmitted to the second computing terminal while the second computing terminal analyzes and processes the second noise reduction sub-signals; and the number of the first and second groups,
and the second computing terminal couples the received first noise reduction sub-signal and the second noise reduction sub-signal according to a set algorithm to obtain a coupled noise reduction signal, and the second computing terminal plays the coupled noise reduction signal through an audio player.
By adopting the technical scheme, if the number of the background running processes of the first computing end is greater than that of the background running processes of the second computing end once, the half-section signal is sent to the second computing end for processing, so that the first computing end is added with a process for sending the signal, the second computing end only increases the computing resources for processing the half-section signal, and the computing allocation of the second computing end and the first computing end to the current noise signal is in a relatively balanced state. If the second computing end is allowed to process all the noise signals, the background process for computing the noise reduction signals is added to the background of the second computing end, the background process for computing the noise reduction signals is reduced by the first computing end, the process for sending the signals is added, the relatively balanced state in the computing distribution of the current noise signals is broken, and the method for processing the current noise signals is changed again, so that the increase of extra processing time can be reduced.
Preferably, the method further comprises:
the second computing end and the first computing end are in data connection with the audio player through wireless, and data connection between the first computing end and the audio player is established;
the first computing terminal sends the noise reduction signal to the audio player; and the number of the first and second groups,
and the audio player couples the noise reduction signal with the audio signal received by the audio player from the second computing terminal and plays the coupled noise reduction signal.
By adopting the technical scheme, the first computing end directly sends the noise reduction signal to the audio player, the audio player performs coupling, and compared with the case that the first computing end sends the noise reduction signal to the second computing end and the second computing end is sent to the audio player after being coupled, the transmission time is shortened, and errors or signal loss in the transmission process is reduced.
Preferably, the method further comprises:
detecting a first connection signal loss between the second computing terminal and the first computing terminal, detecting a connection signal loss between the audio player and the second computing terminal and a connection signal loss between the audio player and the first computing terminal, and calculating an average value of the two connection signal losses as a second connection signal loss; and the number of the first and second groups,
and if the loss of the first connection signal is less than that of the second connection signal, the first computing end sends the noise reduction signal to the second computing end, and the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing.
By adopting the technical scheme, if the computing power of the audio player is insufficient, the computing power of wireless transmission cannot be guaranteed, so that the second connection signal loss is large, the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing, the computing burden of the audio player is reduced, and the noise reduction experience is improved.
In a second aspect, the present application provides an active noise reduction system, which adopts the following technical solutions:
an active noise reduction system comprises a first calculation end arranged in a preset space and a second calculation end in data connection with the first calculation end;
the first computing end comprises:
the audio acquisition module is configured to acquire a noise sound source in a preset space and output a noise audio signal;
the audio processing module is configured to be in signal connection with the audio acquisition module and is used for receiving the noise audio signal and analyzing and calculating the noise audio signal to obtain a noise frequency spectrum;
a noise reduction signal generation module configured to be in data connection with the audio processing module, receive the noise frequency spectrum, and generate a noise reduction signal with the same frequency and amplitude as the noise frequency spectrum and a phase difference of 180 degrees for suppressing noise according to the noise frequency spectrum, wherein the first calculation end calculates the noise reduction signal into a first differential signal and a second differential signal through a differential algorithm, the first differential signal and the second differential signal are restored through simple operation to obtain the noise reduction signal, and the first differential signal and the second differential signal are wirelessly transmitted to the second calculation end through two frequency channels; and the number of the first and second groups,
the noise reduction signal output module is configured to be in data connection with the preset player, receive the noise reduction signal and output the noise reduction signal to a second computing end;
the second computing terminal comprises:
a noise reduction signal receiving module, configured to receive the noise reduction signal, where the second computing terminal receives the first differential signal and the second differential signal and then restores the first differential signal and the second differential signal to the noise reduction signal; and; and the number of the first and second groups,
and the coupling noise reduction signal module is used for coupling the noise reduction signal with an audio signal to be played and then playing the audio signal through an audio player.
By adopting the technical scheme, the processor of the first computing end is utilized for processing, the noise reduction signal is obtained through computing, the noise reduction signal is sent to the second computing end, the second computing end is played through the audio player, the audio is not required to be collected and computed by the second computing end, transmission delay is reduced, the noise waves generated after computing and used for offsetting the noise well offset the noise changing in real time, and therefore the active noise reduction effect is improved.
Preferably, the first computing end and the second computing end each include:
the detection process module is used for detecting the number of the background running processes;
the second computing end sends the background running process number of the second computing end to the first computing end;
the first computing end further comprises:
the comparison process module is used for comparing if the number of the background running processes of the first computing end is larger than that of the background running processes of the second computing end, and the first computing end analyzes and processes the half-section signal in the noise audio signal to obtain a first noise reduction sub-signal;
the first computing terminal sends the remaining half-segment signals in the noise audio signals to the second computing terminal, the second computing terminal analyzes and processes the received remaining half-segment signals to obtain second noise reduction sub-signals, and the first noise reduction sub-signals are transmitted to the second computing terminal while the second computing terminal analyzes and processes the second noise reduction sub-signals;
and the second computing terminal couples the received first noise reduction sub-signal and the second noise reduction sub-signal according to a set algorithm to obtain a coupled noise reduction signal, and the second computing terminal plays the coupled noise reduction signal through an audio player.
By adopting the technical scheme, if the number of the background running processes of the first computing end is greater than that of the background running processes of the second computing end, the half-section signal is sent to the second computing end for processing, and the increase of extra processing time can be reduced.
Preferably, the second computing end and the first computing end are both in data connection with the audio player through wireless, and data connection between the first computing end and the audio player is established;
the first computing terminal sends the noise reduction signal to the audio player;
the audio player includes:
a noise reduction signal receiving module for receiving the noise reduction signal; and the number of the first and second groups,
and the coupling noise reduction signal module is used for coupling the noise reduction signal with the audio signal received from the second computing terminal and then playing the coupled noise reduction signal.
By adopting the technical scheme, the transmission time is shortened, and errors or signal loss in the transmission process are reduced.
Preferably, the first calculating end and the second calculating end are both provided with:
the signal loss detection module is used for detecting the connection signal loss between two devices connected by data;
the signal loss detection module detects a first connection signal loss between the second calculation end and the first calculation end, detects a connection signal loss between the audio player and the second calculation end and a connection signal loss between the audio player and the first calculation end, and calculates an average value of the two connection signal losses as a second connection signal loss;
and if the loss of the first connection signal is less than that of the second connection signal, the first computing end sends the noise reduction signal to the second computing end, and the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing.
By adopting the technical scheme, the calculation burden of the audio player is reduced, and the noise reduction experience is improved.
In a third aspect, the present application provides a computer storage medium, which adopts the following technical solutions:
a computer readable storage medium storing a computer program that can be loaded by a processor and that can perform any of the above methods of active noise reduction.
The application has at least one of the following beneficial effects:
1. the noise reduction method comprises the steps that an audio acquisition module of a first computing end is used for acquiring and processing noise in a preset space to obtain a noise reduction signal, the noise reduction signal is sent to a second computing end, the second computing end plays the noise reduction signal through an audio player, and the second computing end is not required to acquire audio and calculate, so that transmission delay between sound acquired by the second computing end and sound sent by the second computing end is reduced, transmission delay is reduced, and noise waves generated after calculation and used for offsetting the noise well offset noise changing in real time;
2. and sending the half-segment signal to a second computing end for processing, so that the first computing end is added with a process for sending the signal, the second computing end only increases computing resources for processing the half-segment signal, and under the condition that the number of background running processes of the first computing end is greater than that of the background running processes of the second computing end, the computing distribution of the current noise signal between the second computing end and the first computing end is in a relatively balanced state.
Drawings
Fig. 1 is a schematic method flow diagram of the active noise reduction method of the present application.
Fig. 2 is a system structure block diagram of the active noise reduction system of the present application.
Fig. 3 is a block diagram of the structure of the modules in the active noise reduction system of the present application.
Reference numerals: 1. a detection progress module; 2. an audio acquisition module; 3. an audio processing module; 4. a noise reduction signal generation module; 5. a noise reduction signal receiving module; 6. a noise reduction signal module is coupled; 7. a comparison progress module; 8. a noise reduction signal output module; 9. and a signal loss detection module.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiments of the present application will be described in further detail with reference to the drawings attached hereto.
The embodiment of the application discloses an active noise reduction method, as shown in fig. 1, comprising the following steps:
and establishing data connection between a first computing terminal with the audio acquisition module 2 and a second computing terminal connected with an audio player. The first computing end can adopt a vehicle-mounted computer or a traveling computer, the vehicle-mounted computer is provided with a wireless connection module, such as a WIFI module or a Bluetooth module, the second computing end can be a smart phone, the audio player can be a wireless audio player, and the first computing end, the second computing end and the audio player can be connected in pairs. For example, the second computing terminal is interconnected with the first computing terminal through WIFI, the second computing terminal is interconnected with the audio player through bluetooth, and the first computing terminal is interconnected with the audio player through bluetooth.
The noise audio signal in the preset space is collected through the first computing end, analyzed and processed, the noise audio signal is analyzed, and a noise reduction signal which is identical to the noise audio signal in frequency and amplitude and has a phase difference of 180 degrees and used for suppressing noise is generated. The first computing end computes the noise reduction signal into a first differential signal and a second differential signal through a differential algorithm, the first differential signal and the second differential signal are restored through simple operation to obtain the noise reduction signal, meanwhile, the first differential signal and the second differential signal are wirelessly sent to the second computing end by using two frequency channels, and the second computing end restores the noise reduction signal after receiving the first differential signal and the second differential signal. The noise reduction signal is calculated into a first differential signal and a second differential signal through a differential algorithm, so that the anti-electromagnetic interference performance of the noise reduction signal can be improved when the noise reduction signal is transmitted by using two channels, the wireless transmission accuracy is improved, the signal transmitted by the channels can be more fidelity, the loss degree of the noise reduction signal is reduced, and the noise reduction effect is improved.
And transmitting the noise reduction signal to a second computing end, and playing the noise reduction signal and the audio signal to be played through an audio player after the second computing end is coupled with the noise reduction signal and the audio signal to be played.
Non-adaptive feedforward ANC can be adopted, ambient noise is recorded in real time through an external microphone, the recorded sound is filtered through a designed feedforward filter, the phase is inverted by 180 degrees, and then the sound is played through an audio player loudspeaker. The method can be used in intelligent homes, the first computing end can be intelligent hardware, the second computing end can be a mobile end, and the audio player can be an intelligent sound box; the method can also be used in an automobile scheme, the first computing end can be a vehicle-mounted computer, the second computing end can be a mobile end, and the audio player can be an earphone.
And detecting the number of the background running processes of the first computing end and the number of the background running processes of the second computing end, and sending the number of the background running processes of the second computing end to the first computing end by the second computing end. And if the number of the background running processes of the first computing end is larger than that of the background running processes of the second computing end, the first computing end analyzes and processes the half-segment signal in the noise audio signal to obtain a first noise reduction sub-signal. The first computing end background and the second computing end background are internally provided with programs for counting the number of background running processes, and generally, a user does not use the first computing end to browse or entertain the network but uses a second computing end such as a mobile phone, a tablet and the like, so that the number of the background running processes of the second computing end is larger than that of the background running processes of the first computing end.
The first computing terminal sends the remaining half-segment signals in the noise audio signals to the second computing terminal, the second computing terminal analyzes and processes the received remaining half-segment signals to obtain second noise reduction sub-signals, and the first noise reduction sub-signals are transmitted to the second computing terminal while the second computing terminal analyzes and processes the second noise reduction sub-signals. And the second computing terminal couples the received first noise reduction sub-signal and the second noise reduction sub-signal according to a set algorithm to obtain a coupled noise reduction signal, and the second computing terminal plays the coupled noise reduction signal through an audio player. During actual operation, the first computing terminal sends the half-segment signal with the duration not longer than half second to the second computing terminal for processing, the first computing terminal processes the remaining half-segment signal by itself, and the sum of the transmission time and the processing time of the signal is preferably not longer than one second, so that the signal processing time is not longer than one second.
The second computing end and the first computing end are in data connection with the audio player through wireless, and data connection between the first computing end and the audio player is established. The first computing terminal sends the noise reduction signal to the audio player. And the audio player couples the noise reduction signal with the audio signal received by the audio player from the second computing terminal and plays the coupled noise reduction signal. And detecting the first connection signal loss between the second calculation end and the first calculation end, detecting the connection signal loss between the audio player and the second calculation end and the connection signal loss between the audio player and the first calculation end, and calculating the average value of the two connection signal losses as the second connection signal loss. And if the loss of the first connection signal is less than that of the second connection signal, the first computing end sends the noise reduction signal to the second computing end, and the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing.
In other cases, for example, the second computing end is not enough to allocate computing resources, and the time required for computing or transmission is long, the first computing end may directly send the noise reduction signal to the audio player, the audio player has a built-in computing chip, and the audio player couples the noise reduction signal and the sound signal, compared with the case where the first computing end sends the noise reduction signal to the second computing end and the second computing end is coupled and then sends the noise reduction signal to the audio player, the transmission time is shortened, and errors or signal loss in the transmission process is reduced. If the computing power of the audio player is insufficient, the computing power of wireless transmission cannot be guaranteed, so that the second connection signal loss is large, the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing, the computing burden of the audio player is reduced, and the noise reduction experience is improved.
The application process of the scheme is as follows: under normal conditions, the number of the APPs running in the background of the first computing end is far smaller than that of the APPs running in the background of the second computing end, so that the utilization rate of the computing resources in the background of the first computing end is also far smaller than that of the computing resources in the background of the second computing end. By utilizing the audio acquisition module 2 provided by the first computing end, the audio acquisition module 2 is internally provided with a microphone surrounding the inner wall of the preset space to acquire the noise in the preset space. The first computing end processes the collected noise through a processor, a noise reduction signal is obtained through computing, the noise reduction signal is sent to the second computing end, the second computing end couples the sound signal to be played with the noise reduction signal and then plays the sound signal through an audio player, and active noise reduction is achieved. The second computing end is not required to collect audio and calculate, so that transmission delay between sound collected by the second computing end and sound sent by the second computing end due to thread blockage or process blockage of other codes except for the noise reduction algorithm of the second computing end is reduced, the transmission delay is reduced, noise waves generated after calculation and used for offsetting noise well offset noise changing in real time, and the active noise reduction effect is improved.
If the software on the second computing end does not occupy too many backstage, or the second computing end clears the backstage, so that the number of the running processes of the backstage of the first computing end is larger than that of the running processes of the backstage of the second computing end, the first computing end sends the half-section signal to the second computing end for processing, so that the first computing end is added with a process for sending the signal, the second computing end only increases the computing resource for processing the half-section signal, and the computing allocation of the current noise signal between the second computing end and the first computing end is in a relatively balanced state. If the second computing end is allowed to process all the noise signals, the background process for computing the noise reduction signals is added to the background of the second computing end, the background process for computing the noise reduction signals is reduced by the first computing end, the process for sending the signals is added, the relatively balanced state in the computing distribution of the current noise signals is broken, and the method for processing the current noise signals is changed again, so that the increase of extra processing time can be reduced.
The embodiment of the present application further discloses an active noise reduction system, as shown in fig. 2 and 3, including a first computing end disposed in the preset space and a second computing end in data connection with the first computing end;
the first computing end comprises:
and the process detection module 1 is used for detecting the number of the processes running in the background.
And the audio acquisition module 2 is configured to acquire a noise sound source inside the preset space and output a noise audio signal.
And the audio processing module 3 is configured to be in signal connection with the audio acquisition module 2 and is used for receiving the noise audio signal and analyzing and calculating the noise spectrum.
And the noise reduction signal generation module 4 is configured to be in data connection with the audio processing module 3, receive the noise spectrum and generate a noise reduction signal which has the same frequency and amplitude as the noise and has a phase difference of 180 degrees and is used for suppressing the noise according to the noise spectrum. The first computing end computes the noise reduction signal into a first differential signal and a second differential signal through a differential algorithm, the first differential signal and the second differential signal are restored through simple operation to obtain the noise reduction signal, and meanwhile the first differential signal and the second differential signal are wirelessly sent to the second computing end through two frequency channels.
And the comparison process module 7 is configured to compare the first computing end and the second computing end to obtain a first noise reduction component signal if the number of the background running processes of the first computing end is greater than the number of the background running processes of the second computing end.
And the noise reduction signal output module 8 is configured to be in data connection with a preset player, receive the noise reduction signal and output the noise reduction signal to the second computing terminal.
The second calculation end comprises:
and the process detection module 1 is used for detecting the number of the processes running in the background. And the second computing terminal sends the background running process number of the second computing terminal to the first computing terminal.
And the noise reduction signal receiving module 5 is configured to receive a noise reduction signal, where the second computing terminal receives the first differential signal and the second differential signal and then restores the first differential signal and the second differential signal to the noise reduction signal.
And the coupling noise reduction signal module 6 is used for coupling the noise reduction signal with the audio signal to be played and then playing the audio signal through an audio player.
The first computing terminal sends the remaining half-segment signals in the noise audio signals to the second computing terminal, the second computing terminal analyzes and processes the received remaining half-segment signals to obtain second noise reduction sub-signals, and the first noise reduction sub-signals are transmitted to the second computing terminal while the second computing terminal analyzes and processes the second noise reduction sub-signals.
The second computing terminal couples the received first noise reduction sub-signal with the received second noise reduction sub-signal according to a set algorithm to obtain a coupled noise reduction signal, and the second computing terminal plays the coupled noise reduction signal through an audio player.
The audio player includes:
and the receiving noise reduction signal module 5 is used for receiving the noise reduction signal.
And the coupling noise reduction signal module 6 is used for coupling the noise reduction signal with the audio signal received from the second computing terminal and then playing the coupled noise reduction signal.
In order to shorten the transmission time and reduce errors or signal loss in the transmission process, the second computing end and the first computing end can be wirelessly connected with the audio player in a data mode, the data connection between the first computing end and the audio player is established, and the first computing end sends the noise reduction signal to the audio player.
In order to reduce the calculation burden of the audio player, the noise reduction experience is improved. The first calculation end and the second calculation end are provided with:
and the signal loss detection module 9 is configured to detect a connection signal loss between two devices connected by data.
The signal loss detection module 9 detects a first connection signal loss between the second calculation terminal and the first calculation terminal, and the signal loss detection module 9 detects a connection signal loss between the audio player and the second calculation terminal and a connection signal loss between the audio player and the first calculation terminal and calculates an average value of the two connection signal losses as a second connection signal loss.
And if the loss of the first connection signal is less than that of the second connection signal, the first computing end sends the noise reduction signal to the second computing end, and the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing.
The implementation process is as follows: the first computing end is used for processing the noise reduction signal through a processor, the noise reduction signal is obtained through calculation, the noise reduction signal is sent to the second computing end, the second computing end is played through the audio player, the second computing end is not needed to collect audio and calculate, transmission delay is reduced, noise waves generated after calculation and used for offsetting noise well offset noise changing in real time, and therefore the active noise reduction effect is improved. If the number of the background running processes of the first computing end is greater than that of the background running processes of the second computing end, the half-section signal is sent to the second computing end for processing, and the increase of extra processing time can be reduced.
The embodiment of the present application further discloses a computer readable storage medium, which stores a computer program that can be loaded by a processor and execute the above-mentioned active noise reduction method.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A method of active noise reduction, characterized by: the method comprises the following steps:
establishing data connection between a first computing end with an audio acquisition module (2) and a second computing end connected with an audio player;
acquiring a noise audio signal in a preset space through a first calculation end, analyzing and processing the noise audio signal, and generating a noise reduction signal which has the same frequency and amplitude as those in the noise audio signal and has a phase difference of 180 degrees and is used for suppressing noise from the noise audio signal;
transmitting the noise reduction signal to the second computing terminal, wherein the first computing terminal computes the noise reduction signal into a first differential signal and a second differential signal through a differential algorithm, the first differential signal and the second differential signal are restored through simple operation to obtain the noise reduction signal, the first differential signal and the second differential signal are wirelessly transmitted to the second computing terminal through two frequency channels, and the second computing terminal restores the noise reduction signal after receiving the first differential signal and the second differential signal; and the number of the first and second groups,
and the second computing terminal is coupled with the noise reduction signal and the audio signal to be played and then plays the audio signal through an audio player.
2. The method of claim 1, wherein: the method further comprises the following steps:
detecting the number of background running processes of a first computing end and the number of background running processes of a second computing end, and sending the number of the background running processes of the second computing end to the first computing end by the second computing end;
if the number of the background running processes of the first computing end is larger than that of the background running processes of the second computing end, the first computing end analyzes and processes half-segment signals in the noise audio signals to obtain first noise reduction sub-signals;
the first computing terminal sends the remaining half-segment signals in the noise audio signals to the second computing terminal, the second computing terminal analyzes and processes the received remaining half-segment signals to obtain second noise reduction sub-signals, and the first noise reduction sub-signals are transmitted to the second computing terminal while the second computing terminal analyzes and processes the second noise reduction sub-signals; and the number of the first and second groups,
and the second computing terminal couples the received first noise reduction sub-signal and the second noise reduction sub-signal according to a set algorithm to obtain a coupled noise reduction signal, and the second computing terminal plays the coupled noise reduction signal through an audio player.
3. The method of claim 1, wherein: the method further comprises the following steps:
the second computing end and the first computing end are in data connection with the audio player through wireless, and data connection between the first computing end and the audio player is established;
the first computing terminal sends the noise reduction signal to the audio player; and the number of the first and second groups,
and the audio player couples the noise reduction signal with the audio signal received by the audio player from the second computing terminal and plays the coupled noise reduction signal.
4. The method of claim 3, wherein: the method further comprises the following steps:
detecting a first connection signal loss between the second computing terminal and the first computing terminal, detecting a connection signal loss between the audio player and the second computing terminal and a connection signal loss between the audio player and the first computing terminal, and calculating an average value of the two connection signal losses as a second connection signal loss; and the number of the first and second groups,
and if the loss of the first connection signal is less than that of the second connection signal, the first computing end sends the noise reduction signal to the second computing end, and the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing.
5. An active noise reduction system, comprising: the system comprises a first calculation end arranged in a preset space and a second calculation end in data connection with the first calculation end;
the first computing end comprises:
the audio acquisition module (2) is configured to acquire a noise sound source in a preset space and output a noise audio signal;
the audio processing module (3) is configured to be in signal connection with the audio acquisition module (2) and is used for receiving the noise audio signal and analyzing and calculating the noise frequency spectrum;
a noise reduction signal generation module (4) configured to be in data connection with the audio processing module (3), receive the noise reduction signal, and generate a noise reduction signal for suppressing noise with the same noise frequency and amplitude and a phase difference of 180 degrees according to the noise spectrum, wherein the first calculation end calculates the noise reduction signal into a first differential signal and a second differential signal through a differential algorithm, the first differential signal and the second differential signal are restored through simple operation to obtain the noise reduction signal, and the first differential signal and the second differential signal are wirelessly transmitted to the second calculation end by using two frequency channels respectively; and the number of the first and second groups,
the noise reduction signal output module (8) is configured to be in data connection with the preset player, receive the noise reduction signal and output the noise reduction signal to a second computing end;
the second computing terminal comprises:
a noise reduction signal receiving module (5) configured to receive the noise reduction signal, wherein the second computing terminal receives the first differential signal and the second differential signal and then restores the first differential signal and the second differential signal to the noise reduction signal; and the number of the first and second groups,
and the coupling noise reduction signal module (6) is used for coupling the noise reduction signal and the audio signal to be played and then playing the audio signal through an audio player.
6. The system of claim 5, wherein: the first computing end and the second computing end both comprise:
the detection process module (1) is used for detecting the number of the background running processes;
the second computing end sends the background running process number of the second computing end to the first computing end;
the first computing end further comprises:
a comparison process module (7) for comparing, if the number of the background running processes of the first computing end is greater than the number of the background running processes of the second computing end, the first computing end analyzes and processes the half-segment signal in the noise audio signal to obtain a first noise reduction sub-signal;
the first computing terminal sends the remaining half-segment signals in the noise audio signals to the second computing terminal, the second computing terminal analyzes and processes the received remaining half-segment signals to obtain second noise reduction sub-signals, and the first noise reduction sub-signals are transmitted to the second computing terminal while the second computing terminal analyzes and processes the second noise reduction sub-signals;
and the second computing terminal couples the received first noise reduction sub-signal and the second noise reduction sub-signal according to a set algorithm to obtain a coupled noise reduction signal, and the second computing terminal plays the coupled noise reduction signal through an audio player.
7. The system of claim 5, wherein: the second computing end and the first computing end are in data connection with the audio player through wireless, and data connection between the first computing end and the audio player is established;
the first computing terminal sends the noise reduction signal to the audio player;
the audio player includes:
a receive noise reduction signal module (5) for receiving the noise reduction signal; and the number of the first and second groups,
and the coupling noise reduction signal module (6) is used for coupling the noise reduction signal with the audio signal received from the second computing terminal and then playing the coupled noise reduction signal.
8. The system of claim 7, wherein: the first calculating end and the second calculating end are provided with:
a signal loss detection module (9) for detecting a connection signal loss between two devices of the data connection;
the signal loss detection module (9) detects a first connection signal loss between the second computing terminal and the first computing terminal, the signal loss detection module (9) detects a connection signal loss between the audio player and the second computing terminal and a connection signal loss between the audio player and the first computing terminal and calculates an average value of the two connection signal losses as a second connection signal loss;
and if the loss of the first connection signal is less than that of the second connection signal, the first computing end sends the noise reduction signal to the second computing end, and the second computing end couples the received noise reduction signal with the audio signal to be played and then sends the coupled noise reduction signal to the audio player for playing.
9. A computer-readable storage medium characterized by: a computer program which can be loaded by a processor and which executes the method according to any of claims 1 to 4.
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