CN113689842A - Integrated system for active noise reduction and audio power amplification of automobile - Google Patents
Integrated system for active noise reduction and audio power amplification of automobile Download PDFInfo
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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
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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Abstract
The invention relates to an integrated system for active noise reduction and audio power amplification of an automobile, which comprises a main control chip, two paths of A2B buses, an auxiliary circuit, a communication bus and an audio power amplification circuit, the main control chip is respectively connected with the auxiliary circuit, two paths of A2B buses, the audio power amplifying circuit and the communication bus, one path of A2B bus is connected with a microphone with an A2B bus, the other path of A2B bus is connected with a vibration sensor with an A2B bus, the communication bus is connected with a vehicle-mounted CAN signal for acquiring an engine rotating speed signal and a vehicle window opening signal, the microphone with the A2B bus collects sound wave signals in the automobile, the vibration sensor with the A2B bus acquires automobile vibration signals, the main control chip executes engine noise reduction, road noise reduction and audio signal power amplification based on the vehicle-mounted CAN signal, the in-vehicle sound wave signal and the automobile vibration signal. Compared with the prior art, the invention has the advantages of reducing the overall cost, lightening the weight and the like.
Description
Technical Field
The invention relates to the technical field of automobile noise reduction, in particular to an integrated system for automobile active noise reduction and audio power amplification.
Background
With the development of the automobile industry and the improvement of the living standard of people, the requirement of consumers on the noise inside the automobile is higher and higher. The traditional method for processing the internal noise of the automobile is a mechanical method, such as optimizing the structure of the automobile body, adding a damping and sound-absorbing material, using a noise-reducing tire and the like, and the methods have the disadvantages of high cost, long development period, increased weight of the automobile body and limited effect. On the basis of mechanical processing, an active noise reduction technology for controlling a loudspeaker in a vehicle is adopted at present, however, most of active noise reduction mainly reduces engine noise, and road noise cannot be reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an integrated system for automobile active noise reduction and audio power amplification, which utilizes a set of system to simultaneously realize the automobile active noise reduction function and the audio power amplification function, can obviously reduce the overall cost, reduce the weight, make the structure of the system in the automobile simpler and can reduce the automobile development period. .
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an automobile is initiatively fallen and is fallen integrated system of making an uproar and audio power amplification, this system includes master control chip, two way A2B buses, communication bus and audio power amplifier circuit, master control chip is connected respectively with two way A2B buses, audio power amplifier circuit and communication bus, audio function amplifier circuit is connected with a plurality of car speakers, the microphone that has A2B bus of A2B bus connection all the way, the microphone that has A2B bus simulates the human ear, another way A2B bus connection has the vibration sensor of A2B bus, the vibration sensor that has A2B bus gathers the vibration signal under the automobile motion state, communication bus inserts on-vehicle CAN signal for acquire engine speed signal and door window opening signal, the microphone that has A2B bus gathers the sound wave signal in the car, the vibration sensor that has A2B bus acquires the automobile vibration signal, the main control chip executes engine noise reduction, road noise reduction and audio signal power amplification based on the vehicle-mounted CAN signal, the in-vehicle sound wave signal and the automobile vibration signal.
The specific steps of the main control chip for executing the engine noise reduction comprise:
11) firstly, judging whether a condition for starting an engine noise reduction function is met or not according to a vehicle-mounted CAN signal;
12) when the starting condition of the engine noise reduction function is met, the rotating speed of the engine is read through a CAN of the whole vehicle, sound wave signals in the vehicle are collected through a microphone with an A2B bus, and then audio signals for the engine noise reduction function are calculated;
13) fitting the signal obtained in the step 12) with other audio signals, controlling an audio power amplifying circuit, driving a loudspeaker in the vehicle, and emitting sound waves for offsetting noise generated by the operation of the transmitter.
The specific steps of the main control chip for reducing the road noise comprise:
21) firstly, judging whether a condition for starting a road noise reduction function is met or not according to a vehicle-mounted CAN signal;
22) when the starting condition of the road noise reduction function is met, reading a vibration sensor signal with an A2B bus, simultaneously collecting an in-vehicle sound wave signal by using a microphone with an A2B bus, and further calculating an audio signal for the road noise reduction function;
23) fitting the signal obtained in step 22) to other audio signals, controlling an audio power amplifying circuit, driving a loudspeaker in the vehicle, and emitting sound waves for counteracting the road noise conducted by the tire when the vehicle moves.
The specific content of the main control chip for executing the audio signal power amplification is as follows:
the method comprises the steps of obtaining a plurality of audio signals sent by an automobile, audio signals obtained through engine noise reduction and audio signals obtained through road noise reduction, fitting the obtained audio signals, achieving audio signal power amplification, and controlling an in-automobile loudspeaker through the fitted audio signals.
Further, the vibration sensor with the A2B bus adopts a three-axis acceleration sensor for measuring three directions of XYZ.
Further, the main control chip adopts a DRA788 chip of TI company.
Furthermore, the two paths of A2B buses adopt AD2428W chips of TI company.
Further, the microphone with the A2B bus is arranged in the ceiling of the vehicle, near the position of the human ear. The vibration sensor with the A2B bus is arranged on the chassis suspension of the vehicle.
Furthermore, the system also comprises an auxiliary circuit connected with the main control chip, wherein the auxiliary circuit comprises a power supply circuit, a memory and a debugging circuit.
Compared with the prior art, the integrated system for active noise reduction and audio power amplification of the automobile, provided by the invention, at least has the following beneficial effects:
compared with the single automobile audio power amplification system and the automobile internal noise reduction system which needs to be additionally added in the prior art, the system can simultaneously realize the functions of automobile active noise reduction and audio power amplification, and the realized active noise reduction function comprises the following steps: the engine noise is reduced, the road noise is reduced, the overall cost can be obviously reduced, the weight is reduced, the structure of a system in the automobile is simpler, the development period of the automobile can be shortened, and the flexibility is improved.
Drawings
FIG. 1 is a block diagram of an integrated system for active noise reduction and audio power amplification of an automobile according to an embodiment;
FIG. 2 is a schematic diagram of an engine noise reduction process according to an embodiment;
FIG. 3 is a flow chart illustrating road noise reduction in an embodiment;
FIG. 4 is a schematic diagram illustrating an exemplary process for amplifying the power of an audio signal.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
The invention relates to an integrated system for automobile active noise reduction and audio power amplification, which realizes the automobile active noise reduction function and the audio power amplification function simultaneously by designing a set of system. The active noise reduction function of the automobile comprises an engine noise reduction function and a road noise reduction function. The engine noise refers to noise transmitted into a vehicle when the engine runs; road noise refers to noise that is transmitted into a vehicle through tires when the vehicle moves on a road.
Fig. 1 is a block diagram of the structure of an integrated system for active noise reduction and audio power amplification of an automobile, and according to fig. 1, the system of the present invention mainly includes:
1. a main control chip and an auxiliary circuit (such as a power supply circuit, a memory, a debugging circuit and the like);
2. and two paths of A2B buses, wherein one path of A2B bus is connected with a microphone of the A2B bus, and the other path of A2B bus is connected with a vibration sensor of the A2B bus.
The microphone with the A2B bus is used for simulating human ears and is generally arranged at the ceilings of the front seat and the rear seat in the vehicle, and preferably, 2 or 4 microphones are respectively arranged at the top of the front seat, and 2 or 4 microphones are also arranged at the top of the rear seat.
The vibration sensor with the A2B bus is used for acquiring vibration signals in the running process of a vehicle, and the layout principle of the vibration sensor is as follows: at the suspension above the wheels, typically, one vibration sensor is arranged for each wheel's corresponding suspension.
3. The audio power amplifying circuit can be connected with a plurality of automobile speakers.
4. The communication bus is used for other signal access, and mainly obtains CAN signals (receiving the rotating speed of an engine, the opening condition of a vehicle window and the like) of the whole vehicle and audio signals (audio signals such as music, navigation, hands-free telephone and the like played by the vehicle).
The main control chip is respectively connected with the auxiliary circuit, the two paths of A2B buses, the audio power amplifying circuit and the communication bus and integrated on the same main control board.
The main control chip of the system is also connected with the vehicle machine, and a client can start a setting module with the functions of engine noise reduction and road noise reduction through a screen of the vehicle machine.
Among them, A2B (Automotive Audio Bus) is a trademark of ADI corporation (Analog Devices, Inc.). Compared with other communication buses, the A2B has the characteristics of simple connection and low communication delay, and is very suitable for active noise reduction of automobiles. In this embodiment, the vibration sensor with a bus A2B is preferably a triaxial acceleration sensor with a bus A2B, which can measure three directions XYZ at the same time (that is, the acceleration in three directions represents the vibration). The main chip adopts DRA788 of TI company, and the A2B bus chip adopts AD2428W of ADI company.
The functions realized by the invention comprise: engine noise reduction, road noise reduction, and audio signal power amplification, and the flow of implementing each function is described below.
As shown in fig. 2, the specific implementation flow of the engine noise reduction function includes:
1. first, it is determined whether or not a condition for turning on the engine noise reduction function is satisfied. The main conditions are that the client opens the function through the screen of the vehicle, the vehicle door and window are closed, and the engine is in operation (the above information CAN be obtained through the CAN of the whole vehicle).
2. The rotation speed of an engine is read through the CAN of the whole vehicle, and meanwhile, a microphone is used for collecting sound wave signals in the vehicle, and the sound wave signals in the vehicle collected by the microphone are closed-loop feedback signals. And then calculating an audio signal for an engine noise reduction function from the engine speed and the in-vehicle sound wave signal. The method for calculating the audio signal for reducing the engine noise can adopt the existing automobile active noise reduction technology or synthesize a simulated noise source signal according to an engine rotating speed signal, for example, the automobile active noise reduction technology controls an audio player to produce sound, so that the sound produced by the audio player has the same frequency, the same amplitude and the opposite phase with the original noise source (engine noise), and the purpose of noise reduction is achieved by utilizing the sound wave interference principle. The method for synthesizing the analog noise source signal according to the engine rotating speed signal is to predict and estimate the rotating speed of the engine and synthesize the analog noise source signal according to the engine rotating speed signal; calculating communication time delay caused by data acquisition and data processing of active noise reduction control, and adjusting audio playing time; and finally, automatically calling related data of an audio playing database according to the synthesized simulated noise source signal frequency, and driving an audio player to play audio to offset noise in the car in cooperation with the calculated communication time delay. The two ways are merely exemplary embodiments, and the method of acquiring an audio signal for an engine noise reduction function of the present invention is not limited to the above two ways.
3. The signal is fitted to other audio signals, and then an audio power amplifying circuit is controlled to drive a loudspeaker in the vehicle to emit sound waves. The sound waves will cancel part of the noise signal generated by the operation of the engine and serve as a noise reduction function for the engine.
As shown in fig. 3, the specific implementation flow of the road noise reduction includes:
1. first, whether a condition for turning on the road noise reduction function is provided is judged. The main conditions are that the client opens the function through the screen of the vehicle, the door and the window of the vehicle are closed, and the vehicle moves (the information CAN be acquired through the CAN of the whole vehicle).
2. The vibration signal collected by the vibration sensor is read as input, and the sound wave signal in the vehicle is collected by the microphone, wherein the signal and the closed loop feedback signal in the engine noise reduction function are in the same group. An audio signal for the road noise reduction function is then calculated. Calculating the audio signal for the road noise reduction function may employ: and processing the signals collected by the vibration sensor through a transfer function of a conducting path, and then carrying out feedback comparison on the processed signals and the in-vehicle sound wave signals collected by the microphone to generate audio signals for the road noise reduction function.
The above-described manner is only an exemplary embodiment, and the method of acquiring an audio signal for a road noise reduction function of the present invention is not limited to the above-described method.
3. The signal is fitted to other audio signals, and then an audio power amplifying circuit is controlled to drive a loudspeaker in the vehicle to emit sound waves. The sound waves will cancel part of the road noise signal conducted through the tire as the vehicle is moving, serving a road noise reduction function.
As shown in fig. 4, the specific implementation flow of the audio signal power amplification function is as follows:
the part is mainly used for fitting various audio signals (namely making a software sound console), and then sending the fitted signals to an audio power amplifying circuit to control a loudspeaker in a car to send out sound waves.
The audio signal input sources of the part mainly comprise:
1. audio signals such as music, navigation, hands-free telephone and the like sent by the vehicle machine;
2. an engine noise reduction function audio signal;
3. a road noise reduction function audio signal.
Further, according to the above, the above three audio signals are taken as inputs. Different sound effect processing (such as rock, pop, Bruce, human voice and the like) is carried out on audio signals of music, navigation, hands-free telephone and the like sent by a vehicle machine; no sound effect processing is carried out on the engine noise reduction function audio signal and the road noise reduction function audio signal. Then, the audio mixing of a plurality of audios is carried out according to a certain signal proportion so as to achieve an ideal effect.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides an integrated system that car initiative was fallen and is fallen and amplified with audio power, its characterized in that, includes main control chip, two way A2B buses, communication bus and audio power amplifier circuit, main control chip is connected respectively with two way A2B buses, audio power amplifier circuit and communication bus, audio function amplifier circuit is connected with a plurality of car speakers, and the microphone that has A2B bus is connected to A2B bus all the way, the microphone that has A2B bus simulates the human ear, and another way A2B bus connection has the vibration sensor of A2B bus, the vibration sensor that has A2B bus gathers the vibration signal under the car motion state, communication bus inserts on-vehicle signal for acquire engine speed signal and door window opening signal, the microphone that has A2B bus gathers the sound wave signal in the car, the vibration sensor that has A2B bus acquires the car vibration signal, the main control chip executes engine noise reduction, road noise reduction and audio signal power amplification based on the vehicle-mounted CAN signal, the in-vehicle sound wave signal and the automobile vibration signal.
2. The integrated system for active noise reduction and audio power amplification of an automobile according to claim 1, wherein the specific steps of the main control chip performing engine noise reduction comprise:
11) firstly, judging whether a condition for starting an engine noise reduction function is met or not according to a vehicle-mounted CAN signal;
12) when the starting condition of the engine noise reduction function is met, the rotating speed of the engine is read through a CAN of the whole vehicle, sound wave signals in the vehicle are collected through a microphone with an A2B bus, and then audio signals for the engine noise reduction function are calculated;
13) fitting the signal obtained in the step 12) with other audio signals, controlling an audio power amplifying circuit, driving a loudspeaker in the vehicle, and emitting sound waves for offsetting noise generated by the operation of the transmitter.
3. The integrated system for active noise reduction and audio power amplification of an automobile according to claim 1, wherein the specific steps of the main control chip performing road noise reduction comprise:
21) firstly, judging whether a condition for starting a road noise reduction function is met or not according to a vehicle-mounted CAN signal;
22) when the starting condition of the road noise reduction function is met, reading a vibration sensor signal with an A2B bus, simultaneously collecting an in-vehicle sound wave signal by using a microphone with an A2B bus, and further calculating an audio signal for the road noise reduction function;
23) fitting the signal obtained in step 22) to other audio signals, controlling an audio power amplifying circuit, driving a loudspeaker in the vehicle, and emitting sound waves for counteracting the road noise conducted by the tire when the vehicle moves.
4. The integrated system for active noise reduction and audio power amplification of an automobile according to claim 1, wherein the specific content of the main control chip for performing audio signal power amplification is as follows:
the method comprises the steps of obtaining a plurality of audio signals sent by an automobile, audio signals obtained through engine noise reduction and audio signals obtained through road noise reduction, fitting the obtained audio signals, amplifying the fitted audio signals through audio signal power, and outputting the audio signals to a loudspeaker in the automobile for playing.
5. The integrated system for active noise reduction and audio power amplification of automobile of claim 1, wherein the vibration sensor with A2B bus is a three-axis acceleration sensor for measuring three directions of XYZ.
6. The integrated system for active noise reduction and audio power amplification of an automobile according to claim 1, wherein the main control chip is a DRA788 chip of TI corporation.
7. The integrated system for active noise reduction and audio power amplification of automobile of claim 1, wherein the two-way A2B bus employs an AD2428W chip from TI corporation.
8. The integrated system for active noise reduction and audio power amplification of an automobile according to claim 1, wherein the microphone with the A2B bus is arranged in the ceiling of the automobile and close to the position of human ears.
9. The integrated system for active noise reduction and audio power amplification of an automobile according to claim 1, wherein the vibration sensor with the A2B bus is provided on an automobile chassis suspension.
10. The integrated system for active noise reduction and audio power amplification of automobile of claim 1, further comprising an auxiliary circuit connected with the main control chip, wherein the auxiliary circuit comprises a power circuit, a memory and a debugging circuit.
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| CN114333755A (en) * | 2022-03-17 | 2022-04-12 | 滨州学院 | Intelligent monitoring and noise reduction device and method for in-car noise in automobile running |
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