CN113973254A - Noise reduction system of automobile audio power amplifier - Google Patents
Noise reduction system of automobile audio power amplifier Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
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Abstract
The invention discloses a noise reduction system of an automobile audio power amplifier, which comprises a recording unit, a primary descending processing unit, an intercepting unit, a secondary descending unit, a data real acquisition unit, a distributed processing unit, a data collection unit, an MCU (microprogrammed control unit), a management unit and an execution unit, wherein the recording unit is used for recording data; the recording unit is an in-vehicle microphone and is used for recording the real-time audio of a vehicle owner and transmitting the real-time audio to the first descending processing unit, and the first descending processing unit receives the real-time audio transmitted by the recording unit; the real-time audio of the car owner is recorded through the recording unit, transmitted to the initial drop processing unit and intercepted by the intercepting unit; the initial drop processing unit can carry out initial denoising processing on the source audio to obtain an initial drop audio; therefore, the interference of the audio played in the waiting car on the voice is realized when the audio in the car is collected.
Description
Technical Field
The invention belongs to the field of automobile audio noise reduction, relates to a noise reduction technology, and particularly relates to a noise reduction system of an automobile audio power amplifier.
Background
Patent publication No. CN107481730A discloses a noise reduction method and system for a car sound pickup system, where the car sound pickup system includes a main sound pickup for picking up human-computer interaction voice and an auxiliary sound pickup for picking up noise, and the method includes: reading audio signals picked up by the main sound pick-up and the auxiliary sound pick-up; filtering a background noise spectrum included in a spectrum of an audio signal picked up by the secondary microphone to update the spectrum of the audio signal picked up by the secondary microphone; judging whether the audio intensity difference between the audio signal picked up by the main sound pick-up and the audio signal picked up by the auxiliary sound pick-up is larger than or equal to a preset value; if so, filtering the updated frequency spectrum of the audio signal picked up by the auxiliary sound pick-up from the frequency spectrum of the audio signal picked up by the main sound pick-up, and further carrying out band-pass filtering of a preset frequency band so as to update the frequency spectrum of the audio signal picked up by the main sound pick-up. The method can reduce the noise of the real-time voice noise and the inherent noise of the automobile, and improves the noise reduction effect of the automobile pickup system.
However, when an instruction is issued by interacting with an automobile in the driving process of the automobile, a lot of noises exist or the effect of the interactive audio is affected by the playing sound source in other automobiles; to solve this problem, a solution is now provided.
Disclosure of Invention
The invention aims to provide a noise reduction system of an automobile audio power amplifier.
The purpose of the invention can be realized by the following technical scheme:
a noise reduction system of an automobile audio power amplifier comprises a recording unit, a primary drop processing unit, an intercepting unit, a secondary drop unit, a data real acquisition unit, a distributed processing unit, a data collection unit, an MCU, a management unit and an execution unit;
the recording unit is an in-vehicle microphone and is used for recording the real-time audio of a vehicle owner and transmitting the real-time audio to the first descending processing unit, and the first descending processing unit receives the real-time audio transmitted by the recording unit;
the intercepting unit is used for intercepting the source audio of the in-vehicle playing source; the intercepting unit is used for transmitting the source audio of the in-vehicle playing source to the initial drop processing unit, and the initial drop processing unit is used for carrying out initial denoising processing on the source audio to obtain the initial drop audio;
the primary drop processing unit is used for transmitting the primary drop audio to the secondary drop unit, and the secondary drop unit receives the primary drop audio transmitted by the primary drop processing unit;
the data collection unit comprises a speed synchronization module, a noise monitoring module and a rainfall monitoring module which are arranged in the automobile; the data collection unit is used for establishing a stray noise model by combining the distributed processing unit;
the data real-time acquisition unit is used for acquiring the real-time speed and the real-time rainfall of the automobile when the initial falling audio is generated and transmitting the real-time speed and the real-time rainfall to the secondary falling unit, and the secondary falling unit is used for carrying out secondary falling processing on the initial falling audio by combining the distributed processing unit to obtain the approved audio;
the secondary descending unit is used for transmitting the approved audio to the MCU, the MCU receives the approved audio transmitted by the secondary descending unit and transmits the approved audio to the execution unit, and the execution unit receives the approved audio transmitted by the MCU and gives feedback according to an operation instruction in the approved audio;
the management unit is used for recording all preset values and is in communication connection with the MCU.
Further, the preliminary denoising processing specifically comprises the following steps:
the method comprises the following steps: acquiring real-time audio;
step two: then extracting source audio, and taking the source audio as background sound;
step three: removing background sound from the real-time audio, and marking the obtained audio as a first-falling audio;
step four: the source audio is audio played in real time and comprises a sound source accessed from a third party device and carried by the automobile; the third-party device is specifically a mobile phone connected to the automobile.
Further, the spurious noise model is specifically established in the following manner:
s1: acquiring real-time noise of the automobile by means of a noise monitoring module;
s2: acquiring a wave-spectrum diagram of real-time noise, and distinguishing and dividing the wave-spectrum diagram to obtain a selected section;
s3: continuously performing the processing step of the step S2, and performing stage extraction on the residual real-time noise after the selection stage, wherein the real-time noise is all real-time noise obtained by continuously observing the driving of the automobile for half a year; obtaining a plurality of selected segments after the treatment;
s4: acquiring data of a plurality of selection stages to acquire a real-time speed norm value and a rainfall information norm value of a corresponding automobile during running; the real-time speed acquisition mode is as follows:
s401: acquiring the highest real-time speed and the lowest real-time speed of the automobile in the corresponding selection stage, and marking the speeds as real-time speed norm values;
s402: acquiring the highest rainfall information and the lowest rainfall information of the automobile in the corresponding selection stage, and marking the highest rainfall information and the lowest rainfall information as rainfall information norm values;
step S5: then, all the selection stages correspond to the speed information norm value and the rainfall information norm value one by one;
step S6: establishing a corresponding model of the selection stage, the speed information norm value and the rainfall information norm value to obtain a stray noise model;
step S7: the spurious noise model is stored in the distributed processing unit.
Further, the specific dividing step of performing the differential division on the bopp map in step S2 is as follows:
s201: acquiring all peaks and troughs, and sequentially marking the peaks and the troughs as F i, wherein i is 1.. n, and Gj is 1.. m;
s202: then, setting i to 1, selecting a corresponding peak and marking the peak as an initial peak;
s203: sequentially enabling i to be i + 1; acquiring a corresponding peak, and bringing the peak into a selected wave band when the difference value of the peak and the peak is less than X1;
s204: repeating the steps S203-S204 until the difference between the obtained peak and the initial peak is less than X1; marking a peak preceding the peak as a peak end point;
s205: performing tail removal treatment on the selected wave band, specifically acquiring a first wave trough, and marking the first wave trough as an initial wave trough;
s206: then sequentially selecting subsequent wave troughs, and marking the wave trough where the previous node of the exceeded wave trough is located as an end node when the difference value between the subsequent wave trough and the initial wave trough exceeds X2;
s207: if the end node is positioned at the front end of the peak end point, marking the initial node to the end node as a selected segment;
and if the end node is positioned at the rear end of the peak end point, marking the initial node to the peak end point as a selected segment.
Further, the second reduction treatment comprises the following specific treatment steps:
SS 1: according to the real-time speed and the real-time rainfall, matching the stray noise model to a corresponding selection stage, and marking the stray noise model as a target stage;
SS 2: obtaining a target stage;
SS 3: and taking the target stage as background sound, and removing the background sound from the initial drop audio to obtain the approved audio.
Further, the specific matching manner in step SS1 is:
SS 11: if the real-time speed and the real-time rainfall do not belong to the speed information norm value and the rainfall information norm value, selecting according to the following steps:
SS 12: taking an endpoint value of a speed information norm value closest to the real-time speed, subtracting the endpoint value from the real-time speed, and marking an obtained difference value as a determination difference value I;
SS 13: then selecting a rainfall information norm value matched with the corresponding speed information norm value, acquiring an end point of the rainfall information norm value closest to the real-time rainfall, solving a difference value between the rainfall information norm value and the end point, and marking the difference value as a second identification difference value;
SS 14: and then calculating an approval difference value, wherein the specific calculation formula is as follows:
SS 15: checking that the difference is 0.49 and the difference is one +0.51 and the difference is two;
SS 16: then acquiring an endpoint value of the rainfall information norm value closest to the real-time rainfall, calculating a difference value between the endpoint value and the real-time rainfall information norm value, and marking the difference value as a first identification difference value; then acquiring a speed information norm value corresponding to the rainfall information norm value to obtain an end point of the rainfall information norm value, which is closest to the real-time speed, calculating a difference value between the two, and marking the difference value as a second identification difference value; substituting the obtained result into the step SS15 to obtain a second verification difference value;
SS 17: according to the magnitude of the two verification difference values, the rainfall information norm value and the speed information norm value corresponding to the small verification difference value are marked as target stages in the corresponding selection stages;
SS 18: and when any value of the real-time speed and the real-time rainfall belongs to the speed information norm value and the rainfall information norm value, directly marking the corresponding selection stage as a target stage.
Furthermore, the in-vehicle playing source refers to all devices which can be connected with the car audio to enable the devices to generate, and the source audio refers to real-time playing content sent to the car audio by the corresponding in-vehicle playing source.
The invention has the beneficial effects that:
the real-time audio of the car owner is recorded through the recording unit, transmitted to the initial drop processing unit and intercepted by the intercepting unit; the initial drop processing unit can carry out initial denoising processing on the source audio to obtain an initial drop audio; therefore, the interference of the audio played in the waiting car on the voice when the audio in the car is acquired is completed;
then, a data collection unit is combined with a distributed processing unit to establish a stray noise model; the real-time speed and the real-time rainfall of the automobile when the initial falling audio is generated are obtained in real time according to the data real-time acquisition unit, the real-time speed and the real-time rainfall are transmitted to the secondary falling unit, and the initial falling audio is subjected to secondary falling processing by means of the secondary falling unit and a stray noise model in the distributed processing unit to obtain a verified audio; the interference of other sounds except the sound played by the automobile to the automobile is eliminated; the invention is simple, effective and easy to use.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a block diagram of the system of the present invention.
Detailed Description
As shown in fig. 1, a noise reduction system for an audio power amplifier of a car,
the system comprises a recording unit, an initial descent processing unit, an interception unit, a secondary descent unit, a data real acquisition unit, a distributed processing unit, a data collection unit, an MCU (microprogrammed control unit), a management unit and an execution unit;
the recording unit is an in-vehicle microphone and is used for recording the real-time audio of a vehicle owner and transmitting the real-time audio to the first descending processing unit, and the first descending processing unit receives the real-time audio transmitted by the recording unit; the intercepting unit is used for intercepting source audio of an in-vehicle playing source, the in-vehicle playing source refers to all equipment which can be connected with the automobile sound equipment to enable the in-vehicle playing source to generate the source audio, and the source audio refers to real-time playing content which is sent to the automobile sound equipment by the corresponding in-vehicle playing source; the intercepting unit is used for transmitting the source audio frequency of the in-vehicle playing source to the initial processing unit, the initial processing unit receives the source audio frequency transmitted by the intercepting unit and carries out preliminary denoising processing on the source audio frequency, and the preliminary denoising processing concrete steps are as follows:
the method comprises the following steps: acquiring real-time audio;
step two: then extracting source audio, and taking the source audio as background sound;
step three: removing background sound from the real-time audio, and marking the obtained audio as a first-falling audio;
step four: the source audio is audio played in real time and comprises a sound source accessed from a third party device and carried by the automobile; the third-party equipment is a mobile phone accessed to the automobile;
the primary drop processing unit is used for transmitting the primary drop audio to the secondary drop unit, and the secondary drop unit receives the primary drop audio transmitted by the primary drop processing unit;
the data collection unit comprises a speed synchronization module, a noise monitoring module and a rainfall monitoring module which are arranged in the automobile; the data collection unit is used for establishing a stray noise model by combining the distributed processing unit, and the stray noise model is specifically established in the following way:
s1: acquiring real-time noise of the automobile by means of a noise monitoring module;
s2: acquiring a wave-spectrum map of real-time noise, and performing differential division on the wave-spectrum map, wherein the specific differential division steps are as follows:
s201: acquiring all peaks and troughs, and sequentially marking the peaks and the troughs as F i, wherein i is 1.. n, and Gj is 1.. m;
s202: then, setting i to 1, selecting a corresponding peak and marking the peak as an initial peak;
s203: sequentially enabling i to be i + 1; acquiring a corresponding peak, and bringing the peak into a selected wave band when the difference value of the peak and the peak is less than X1;
s204: repeating the steps S203-S204 until the difference between the obtained peak and the initial peak is less than X1; marking a peak preceding the peak as a peak end point;
s205: performing tail removal treatment on the selected wave band, specifically acquiring a first wave trough, and marking the first wave trough as an initial wave trough;
s206: then sequentially selecting subsequent wave troughs, and marking the wave trough where the previous node of the exceeded wave trough is located as an end node when the difference value between the subsequent wave trough and the initial wave trough exceeds X2;
s207: if the end node is positioned at the front end of the peak end point, marking the initial node to the end node as a selected segment;
if the end node is positioned at the rear end of the peak end point, marking the initial node to the peak end point as a selected segment;
s3: continuously performing the processing step of the step S2, and performing stage extraction on the residual real-time noise after the selection stage, wherein the real-time noise is all real-time noise obtained by continuously observing the driving of the automobile for half a year; obtaining a plurality of selected segments after the treatment;
s4: acquiring data of a plurality of selection stages to acquire a real-time speed norm value and a rainfall information norm value of a corresponding automobile during running; the real-time speed acquisition mode is as follows:
s401: acquiring the highest real-time speed and the lowest real-time speed of the automobile in the corresponding selection stage, and marking the speeds as real-time speed norm values;
s402: acquiring the highest rainfall information and the lowest rainfall information of the automobile in the corresponding selection stage, and marking the highest rainfall information and the lowest rainfall information as rainfall information norm values;
step S5: then, all the selection stages correspond to the speed information norm value and the rainfall information norm value one by one;
step S6: establishing a corresponding model of the selection stage, the speed information norm value and the rainfall information norm value to obtain a stray noise model;
step S7: storing the stray noise model in a distributed processing unit;
the data real-time acquisition unit is used for acquiring the real-time speed and the real-time rainfall of the automobile when the initial falling audio is generated, transmitting the real-time speed and the real-time rainfall to the secondary falling unit, wherein the secondary falling unit is used for carrying out secondary falling processing on the initial falling audio by combining the distributed processing unit, and the specific processing steps are as follows:
SS 1: according to the real-time speed and the real-time rainfall, the stray noise model is matched to a corresponding selection stage and is marked as a target stage, and the specific matching mode is as follows:
SS 11: if the real-time speed and the real-time rainfall do not belong to the speed information norm value and the rainfall information norm value, selecting according to the following steps:
SS 12: taking an endpoint value of a speed information norm value closest to the real-time speed, subtracting the endpoint value from the real-time speed, and marking an obtained difference value as a determination difference value I;
SS 13: then selecting a rainfall information norm value matched with the corresponding speed information norm value, acquiring an end point of the rainfall information norm value closest to the real-time rainfall, solving a difference value between the rainfall information norm value and the end point, and marking the difference value as a second identification difference value;
SS 14: and then calculating an approval difference value, wherein the specific calculation formula is as follows:
SS 15: checking that the difference is 0.49 and the difference is one +0.51 and the difference is two;
SS 16: then acquiring an endpoint value of the rainfall information norm value closest to the real-time rainfall, calculating a difference value between the endpoint value and the real-time rainfall information norm value, and marking the difference value as a first identification difference value; then acquiring a speed information norm value corresponding to the rainfall information norm value to obtain an end point of the rainfall information norm value, which is closest to the real-time speed, calculating a difference value between the two, and marking the difference value as a second identification difference value; substituting the obtained result into the step SS15 to obtain a second verification difference value;
SS 17: according to the magnitude of the two verification difference values, the rainfall information norm value and the speed information norm value corresponding to the small verification difference value are marked as target stages in the corresponding selection stages;
SS 18: when any value of the real-time speed and the real-time rainfall belongs to the speed information norm value and the rainfall information norm value, directly marking the corresponding selection stage as a target stage;
SS 2: obtaining a target stage;
SS 3: taking the target stage as a background sound, and removing the background sound from the initial drop audio to obtain an approved audio;
the secondary descending unit is used for transmitting the approved audio to the MCU, the MCU receives the approved audio transmitted by the secondary descending unit and transmits the approved audio to the execution unit, and the execution unit receives the approved audio transmitted by the MCU, is used for identifying whether the approved audio relates to an operation instruction or not, and gives feedback according to the operation instruction;
the management unit is used for recording all preset values and is in communication connection with the MCU.
A noise reduction system of an automobile audio power amplifier records real-time audio of an automobile owner through a recording unit, transmits the real-time audio to a first drop processing unit, and then intercepts source audio of an in-automobile playing source through an intercepting unit; the initial drop processing unit can carry out initial denoising processing on the source audio to obtain an initial drop audio; therefore, the interference of the audio played in the waiting car on the voice when the audio in the car is acquired is completed;
then, a data collection unit is combined with a distributed processing unit to establish a stray noise model; the real-time speed and the real-time rainfall of the automobile when the initial falling audio is generated are obtained in real time according to the data real-time acquisition unit, the real-time speed and the real-time rainfall are transmitted to the secondary falling unit, and the initial falling audio is subjected to secondary falling processing by means of the secondary falling unit and a stray noise model in the distributed processing unit to obtain a verified audio; the interference of other sounds except the sound played by the automobile to the automobile is eliminated; the invention is simple, effective and easy to use.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (9)
1. A noise reduction system for an automotive audio power amplifier, comprising:
the recording unit records the real-time audio of the car owner through a microphone and transmits the real-time audio to the initial landing processing unit;
the intercepting unit is used for intercepting the source audio of the in-vehicle playing source; the initial-dropping processing unit performs initial denoising processing on source audio to obtain initial-dropping audio, and transmits the initial-dropping audio to the secondary-dropping unit;
the data collection unit is used for establishing a stray noise model by combining the distributed processing unit;
the data real-time acquisition unit is used for acquiring the real-time speed and real-time rainfall information of the automobile when the automobile generates the initial falling audio and transmitting the real-time speed and real-time rainfall information to the secondary falling unit; the secondary descending unit is combined with the distributed processing unit to carry out secondary descending processing on the primary descending audio frequency to obtain a verified audio frequency and transmit the verified audio frequency to the MCU;
and the execution unit receives the approved audio transmitted by the MCU and gives feedback according to the operation instruction in the approved audio.
2. The noise reduction system of the car audio power amplifier according to claim 1, wherein the preliminary noise reduction processing comprises the following specific steps:
the method comprises the following steps: acquiring real-time audio;
step two: then extracting source audio, and taking the source audio as background sound;
step three: removing background sound from the real-time audio, and marking the obtained audio as a first-falling audio;
step four: the source audio is audio played in real time and comprises a sound source accessed from a third party device and carried by the automobile; the third-party device is specifically a mobile phone connected to the automobile.
3. The noise reduction system of the audio power amplifier of the automobile according to claim 1, wherein the data collection unit comprises a speed synchronization module, a noise monitoring module and a rainfall monitoring module which are arranged in the automobile; the specific establishment method of the stray noise model is as follows:
step S1: acquiring real-time noise of the automobile by means of a noise monitoring module;
step S2: acquiring a wave-spectrum diagram of real-time noise, and distinguishing and dividing the wave-spectrum diagram to obtain a selected section;
step S3: continuously performing the processing step of the step S2, and performing stage extraction on the residual real-time noise after the selection stage, wherein the real-time noise is all real-time noise obtained by continuously observing the driving of the automobile for half a year; obtaining a plurality of selected segments after the treatment;
step S4: data acquisition is carried out on a plurality of selection stages, and a real-time speed norm value and a rainfall information norm value corresponding to the selection stages when the automobile runs are acquired:
step S5: then, all the selection stages correspond to the speed information norm value and the rainfall information norm value one by one;
step S6: establishing a corresponding model of the selection stage, the speed information norm value and the rainfall information norm value to obtain a stray noise model;
step S7: the spurious noise model is stored in the distributed processing unit.
4. The noise reduction system of the car audio power amplifier according to claim 3, wherein the specific dividing step of differentiating and dividing the bopp map in the step S2 is as follows:
step S201: acquiring all peaks and troughs, and sequentially marking the peaks and the troughs as Fi (1.. n) and Gj (1.. m);
step S202: then, setting i to 1, selecting a corresponding peak and marking the peak as an initial peak;
step S203: sequentially enabling i to be i + 1; acquiring a corresponding peak, and bringing the peak into a selected wave band when the difference value of the peak and the peak is less than X1;
step S204: repeating the steps S203-S204 until the difference between the obtained peak and the initial peak is less than X1; marking a peak preceding the peak as a peak end point;
step S205: performing tail removal treatment on the selected wave band, specifically acquiring a first wave trough, and marking the first wave trough as an initial wave trough;
step S206: then sequentially selecting subsequent wave troughs, and marking the wave trough where the previous node of the exceeded wave trough is located as an end node when the difference value between the subsequent wave trough and the initial wave trough exceeds X2;
step S207: if the end node is positioned at the front end of the peak end point, marking the initial node to the end node as a selected segment;
and if the end node is positioned at the rear end of the peak end point, marking the initial node to the peak end point as a selected segment.
5. The noise reduction system of the car audio power amplifier according to claim 1, wherein the specific processing steps of the second-step-down processing are as follows:
step SS 1: according to the real-time speed and the real-time rainfall, matching the stray noise model to a corresponding selection stage, and marking the stray noise model as a target stage;
step SS 2: obtaining a target stage;
step SS 3: and taking the target stage as background sound, and removing the background sound from the initial drop audio to obtain the approved audio.
6. The noise reduction system of the audio power amplifier of the automobile as claimed in claim 5, wherein the specific matching manner in step SS1 is:
SS 11: if the real-time speed and the real-time rainfall do not belong to the speed information norm value and the rainfall information norm value, selecting according to the following steps:
SS 12: taking an endpoint value of a speed information norm value closest to the real-time speed, subtracting the endpoint value from the real-time speed, and marking an obtained difference value as a determination difference value I;
SS 13: then selecting a rainfall information norm value matched with the corresponding speed information norm value, acquiring an end point of the rainfall information norm value closest to the real-time rainfall, solving a difference value between the rainfall information norm value and the end point, and marking the difference value as a second identification difference value;
SS 14: and then calculating an approval difference value, wherein the specific calculation formula is as follows:
SS 15: checking that the difference is 0.49 and the difference is one +0.51 and the difference is two;
SS 16: then acquiring an endpoint value of the rainfall information norm value closest to the real-time rainfall, calculating a difference value between the endpoint value and the real-time rainfall information norm value, and marking the difference value as a first identification difference value; then acquiring a speed information norm value corresponding to the rainfall information norm value to obtain an end point of the rainfall information norm value, which is closest to the real-time speed, calculating a difference value between the two, and marking the difference value as a second identification difference value; substituting the obtained result into the step SS15 to obtain a second verification difference value;
SS 17: according to the magnitude of the two verification difference values, the rainfall information norm value and the speed information norm value corresponding to the small verification difference value are marked as target stages in the corresponding selection stages;
SS 18: and when any value of the real-time speed and the real-time rainfall belongs to the speed information norm value and the rainfall information norm value, directly marking the corresponding selection stage as a target stage.
7. The noise reduction system of the car audio power amplifier according to claim 1, wherein the car audio sources refer to all devices that can be connected to the car audio to enable the generation of the devices, and the source audio refers to real-time playing contents sent to the car audio by the corresponding car audio sources.
8. The noise reduction system of the automobile audio power amplifier according to claim 1, further comprising a management unit, wherein the management unit is used for recording all preset values, and the management unit is in communication connection with the MCU.
9. The noise reduction system of claim 3, wherein the step S4 of obtaining the real-time speed norm and the rainfall information norm during driving of the vehicle comprises:
s401: acquiring the highest real-time speed and the lowest real-time speed of the automobile in the corresponding selection stage, and marking the speeds as real-time speed norm values;
s402: and acquiring the highest rainfall information and the lowest rainfall information of the automobile in the corresponding selection stage, and marking the highest rainfall information and the lowest rainfall information as rainfall information norm values.
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