CN117174058A - Active equalization control system and gain correction method of acoustic system - Google Patents
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Abstract
The invention relates to the technical field of automobile noise, in particular to an active equalization control system and a gain correction method of an acoustic system, wherein the active equalization control system comprises an active noise reduction module, an active noise compensation module, an automatic gain adjustment module, a control module, a noise signal generation module, a sound pickup module and an audio output module, and the real-time noise signal in an automobile is detected through a sound detection module and is transmitted to the control module; and the control module invokes the corresponding modules respectively according to the characteristics of the real-time noise signals, the active noise reduction module generates noise for canceling the protruding order in the vehicle and outputs the noise through the audio output module, and meanwhile, the active noise compensation module utilizes an AGC algorithm to reconstruct and obtain a desired noise signal according to the residual noise of the environment in the vehicle and outputs the noise signal into the vehicle through the audio output module. Thus, unnecessary noise signals are eliminated, missing noise is compensated, and the defects of the existing active equalization control technology are overcome.
Description
Technical Field
The invention relates to the technical field of automobile noise, in particular to an active equalization control system of an acoustic system and a gain correction method.
Background
The design of active noise control (Active Noise Control, ANC) systems generally pursues maximum attenuation of input noise, but in certain applications it is desirable to preserve small residual errors having a specified spectral shape. For example, in an automobile, truck, or bulldozer, the driver needs some audible information about the engine speed to safely control the vehicle. In other situations, people want to not only reduce the noise intensity, but also adjust the noise frequency or amplitude balance to achieve the desired sound effect. This requires the use of active noise quality control (Active Sound Quality Control, ASQC), a technique that is an improvement over active noise control, and that can process unwanted signals and compensate for missing noise signals in a targeted manner to achieve the overall noise level desired.
Disclosure of Invention
The invention aims to provide an active equalization control system and a gain correction method of an acoustic system, and aims to solve the technical problems that the existing active equalization control technology is insufficient in noise compensation or excessive in noise compensation.
In order to achieve the above object, the present invention provides an active equalization control system of an acoustic system, which includes an active noise reduction module, an active noise compensation module, an automatic gain adjustment module, a control module, a noise signal generation module, a sound pickup module and an audio output module, wherein the active noise reduction module, the active noise compensation module and the noise signal generation module are respectively connected with the control module; the control module is connected with the audio output module; one end of the sound pickup module is connected with the active noise reduction module, and the other end of the sound pickup module is sequentially connected with the automatic gain adjustment module and the active noise compensation module.
The active noise reduction module is responsible for generating offset noise of opposite phases of the in-vehicle salient orders, and outputs the offset noise into the vehicle through the audio output module, so that the noise level of the in-vehicle salient orders is reduced, and a narrow-band accompanying least mean square (Narrow BandAdjoint Least Mean Square, NALMS) algorithm is specifically adopted for analyzing and processing noise signals, so that effective suppression of engine order noise is realized.
The active noise compensation module adopts an automatic gain control (Automatic Gain Control, AGC) algorithm, and recombines an expected noise signal according to residual noise of the environment in the vehicle, and then outputs the expected noise signal into the vehicle through the audio output module, so that a noise part with weaker frequency components in the vehicle is compensated.
The control module is used for evaluating the residual noise signals acquired by the sound pickup module according to the NALMS algorithm and judging whether the noise reduction effect reaches an expected target or not;
if the expected target is not reached, updating the filter coefficient, and adjusting the order noise signal generated by the noise signal generation module according to the filter coefficient to make the order noise signal and the environment noise signal in the same frequency opposite phase, so as to form a cancellation noise signal, and outputting the cancellation noise signal to the audio output module, wherein the audio output module is used for converting the cancellation noise signal into sound waves and radiating the sound waves into the environment, so that the aim of reducing the environment noise is fulfilled.
The noise signal generation module receives an engine message according to a controller local area network (ControllerAreaNetwork, CAN) and generates a corresponding order noise signal;
the sound pickup module is used for collecting noise signals in the environment and converting the noise signals into electric signals.
The invention also provides a gain correction method of the acoustic system, which adopts the active equalization control system of the acoustic system and comprises the following steps:
the sound detection module detects real-time noise signals in the vehicle and transmits the real-time noise signals to the control module;
the control module respectively calls the active noise reduction module and the active noise compensation module according to the characteristics of the real-time noise signals;
the active noise reduction module generates noise for counteracting the protruding order in the vehicle and outputs the noise to the vehicle through the audio output module;
the active noise compensation module utilizes an AGC algorithm, and obtains a desired noise signal according to the residual noise recombination of the environment in the vehicle, and outputs the desired noise signal into the vehicle through the audio output module.
The invention provides an active equalization control system and a gain correction method of an acoustic system, wherein the active equalization control system of the acoustic system comprises an active noise reduction module, an active noise compensation module, an automatic gain adjustment module, a control module, a noise signal generation module, a sound pickup module and an audio output module, wherein a real-time noise signal in a vehicle is detected through a sound detection module and is transmitted to the control module; then the control module respectively calls the active noise reduction module and the active noise compensation module according to the characteristics of the real-time noise signals; the active noise reduction module generates noise for canceling the protruding order in the vehicle, the noise is output into the vehicle through the audio output module, and meanwhile, the active noise compensation module utilizes an AGC algorithm to reconstruct and obtain a desired noise signal according to the residual noise of the environment in the vehicle, and the desired noise signal is output into the vehicle through the audio output module. By the gain correction method, the invention can eliminate the unnecessary noise signals, make up the missing noise, and effectively solve the technical problems that the existing active equalization control technology is insufficient in noise compensation or excessive in noise compensation.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of an active equalization control system of an acoustic system according to the present invention.
Fig. 2 is a schematic block diagram of the active noise compensation principle of the present invention.
Fig. 3 is a schematic diagram of an active noise equalization control system of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1, the invention provides an active equalization control system of an acoustic system, which comprises an active noise reduction module, an active noise compensation module, an automatic gain adjustment module, a control module, a noise signal generation module, a sound pickup module and an audio output module, wherein the active noise reduction module, the active noise compensation module and the noise signal generation module are respectively connected with the control module; the control module is connected with the audio output module; one end of the sound pickup module is connected with the active noise reduction module, and the other end of the sound pickup module is sequentially connected with the automatic gain adjustment module and the active noise compensation module.
The control module receives the noise signal generated by the noise signal generation module and the noise signal from the sound pickup module; the audio output module receives the noise cancellation signal generated by the control module.
The active noise compensation module introduces an AGC algorithm, and the algorithm can adaptively adjust an input noise signal according to parameters such as a target output level, maximum gain capacity, a voltage limiter and the like so as to obtain a desired noise signal. And the NALMS active noise reduction algorithm generates a noise signal with corresponding order according to the expected noise signal to realize noise modification.
The active noise reduction module analyzes and processes the noise signals by adopting an NALMS algorithm so as to effectively inhibit the engine order noise.
The specific sound pickup module is represented by a microphone and the audio output module is a speaker.
The active noise reduction principle is as follows: the sound pickup module is used for collecting noise signals in the environment and converting the noise signals into electric signals; the noise signal generation module is used for generating corresponding order noise signals according to engine message signals received by CAN communication; the control module is used for evaluating the residual noise signals collected by the sound pickup module according to the NALMS algorithm, judging whether the noise reduction effect reaches an expected target, if the noise reduction effect does not reach the expected target, updating the filter coefficient, adjusting the order noise signals generated by the noise signal generation module according to the filter coefficient to enable the order noise signals to be in the same frequency opposite phase with the environment noise signals, so that offset noise signals are formed, and outputting the offset noise signals to the loudspeaker, wherein the loudspeaker is used for converting the offset noise signals into sound waves and radiating the sound waves into the environment, and the purpose of reducing the environment noise is achieved.
The active noise compensation principle is as follows: and analyzing and processing signals acquired by the sound pickup module on the basis of the active noise reduction module so as to effectively compensate the engine order noise. The sound pickup module is used for collecting noise signals in the environment and converting the noise signals into electric signals; the automatic gain adjustment module analyzes and processes the noise signals acquired by the sound pickup module, and the noise signals are eliminated, supplemented and reduced through an AGC algorithm to obtain expected noise signals; the noise signal generation module is used for generating corresponding order noise signals according to engine message signals received by CAN communication; the control module is used for evaluating the expected noise signal generated by the automatic gain adjustment module according to the NALMS algorithm, judging whether the gain effect reaches the expected target, if the gain effect does not reach the expected target, updating the filter coefficient, adjusting the order noise signal generated by the noise signal generation module according to the filter coefficient to enable the order noise signal to be in the same frequency and the same phase with the environmental noise signal, so as to form a compensation noise signal, and outputting the compensation noise signal to the loudspeaker, wherein the loudspeaker is used for converting the compensation noise signal into sound waves and radiating the sound waves into the environment, and the purpose of noise equalization is achieved. Further, a schematic block diagram of the active noise compensation principle is shown in fig. 2.
The active equalization control system is a sound processing technology based on active noise reduction and active noise compensation, and can analyze the characteristics of sound and the noise level in real time according to the input signal of the audio pick-up module, and then generate a signal opposite to the noise to counteract the influence of the noise by adjusting the parameters of the filter, so that the purposes of reducing the noise and improving the sound quality are achieved. The system has self-adaptability and flexibility, and can generate a noise reduction curve conforming to psychoacoustics according to different scenes and requirements, so that the sound is clearer and more comfortable, and the specific implementation principle is shown in fig. 3.
In the invention, firstly, the system acquires the information of the current engine speed by connecting with an automobile CAN communication interface. This information is critical to noise control because changes in engine speed are typically related to the frequency characteristics of engine noise. The system uses this information to construct a noise signal of a corresponding order and adds it to the control module to suppress engine noise in a targeted manner.
The microphone is used to pick up noise in the current environment in order to evaluate the current residual noise level, i.e. the noise component that is not suppressed by the engine noise. The control module evaluates and analyzes the residual noise by analyzing the noise signal collected by the microphone. According to the evaluation result, in the active noise reduction module and the active noise compensation module, the system can correspondingly adjust the coefficients of the filter.
In the active noise reduction module, the system processes the noise signal collected by the microphone according to the noise signal by using a proper filtering algorithm so as to weaken or eliminate noise components. This contributes to improvement of sound quality and riding comfort in the vehicle.
In addition, the system uses an Automatic Gain Control (AGC) algorithm in the active noise compensation module to modify the residual noise. The AGC algorithm may automatically adjust the amplification factor based on the intensity of the noise signal collected by the microphone to obtain the desired noise signal. Thus, the noise compensation effect in the control module can be further optimized and the adjustment of the filter coefficient is participated.
The invention also provides a gain correction method of the acoustic system, which adopts the active equalization control system of the acoustic system and comprises the following steps:
the sound detection module detects real-time noise signals in the vehicle, converts the noise in the vehicle into digital signals and transmits the digital signals to the control module;
the control module receives the noise signals, adds the noise signals into the active noise reduction module and the active noise compensation module respectively, and analyzes the noise signals in real time through an active noise reduction algorithm and an active noise compensation algorithm to determine the current residual noise;
meanwhile, the noise signal generation module receives a CAN message through an automobile OBD interface, analyzes the message to obtain the current engine rotating speed, and sends the current rotating speed to the control module; the control module obtains the rotating speed and then adds the rotating speed into an algorithm to calculate;
the active noise reduction module analyzes the residual noise and the engine rotating speed input by the control module, calculates offset noise of an in-vehicle salient order, outputs the offset noise into the vehicle through the audio output module, and meanwhile, updates a filter coefficient of a noise reduction algorithm;
the active noise compensation module analyzes the residual noise input by the control module and the engine rotating speed, the input residual noise is calculated and recombined by the AGC algorithm to obtain an expected noise signal, the obtained expected noise signal and the engine rotating speed signal are added into the active compensation algorithm together to calculate to obtain compensation noise, the compensation noise is output into the vehicle through the audio output module, and meanwhile, the active noise compensation module updates the filter coefficient of the compensation algorithm.
Noise of the protruding order is reduced, and missing frequency noise is compensated, so that the purpose of correcting the gain of noise in the vehicle is achieved.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (6)
1. An active equalization control system for an acoustic system, characterized in that,
the device comprises an active noise reduction module, an active noise compensation module, an automatic gain adjustment module, a control module, a noise signal generation module, a sound pickup module and an audio output module, wherein the active noise reduction module, the active noise compensation module and the noise signal generation module are respectively connected with the control module; the control module is connected with the audio output module; one end of the sound pickup module is connected with the active noise reduction module, and the other end of the sound pickup module is sequentially connected with the automatic gain adjustment module and the active noise compensation module.
2. The active equalization control system of an acoustic system of claim 1,
the active noise reduction module is responsible for generating offset noise of opposite phases of the in-vehicle salient orders, and the offset noise is output into the vehicle through the audio output module, so that the noise level of the in-vehicle salient orders is reduced, and the noise signal is analyzed and processed by specifically adopting an NALMS algorithm, so that the effective suppression of the engine order noise is realized.
3. The active equalization control system of an acoustic system of claim 2, wherein,
the active noise compensation module adopts an AGC algorithm, and recombines an expected noise signal according to residual noise of the environment in the vehicle, and outputs the expected noise signal into the vehicle through the audio output module, so that a noise part with weaker frequency components in the vehicle is compensated.
4. The active equalization control system of an acoustic system of claim 3,
the control module is used for evaluating the residual noise signals acquired by the sound pickup module according to the NALMS algorithm and judging whether the noise reduction effect reaches an expected target;
if the expected target is not reached, updating the filter coefficient, and adjusting the order noise signal generated by the noise signal generation module according to the filter coefficient to make the order noise signal and the environment noise signal in the same frequency opposite phase, so as to form a cancellation noise signal, and outputting the cancellation noise signal to the audio output module, wherein the audio output module is used for converting the cancellation noise signal into sound waves and radiating the sound waves into the environment, so that the aim of reducing the environment noise is fulfilled.
5. The active equalization control system of an acoustic system of claim 4, wherein,
the noise signal generation module is used for generating corresponding order noise signals according to engine message signals received by CAN communication;
the sound pickup module is used for collecting noise signals in the environment and converting the noise signals into electric signals.
6. A gain correction method for an acoustic system, using an active equalization control system for an acoustic system according to any of claims 1-5, comprising the steps of:
the sound detection module detects real-time noise signals in the vehicle and transmits the real-time noise signals to the control module;
the control module respectively calls the active noise reduction module and the active noise compensation module according to the characteristics of the real-time noise signals;
the active noise reduction module generates noise for counteracting the protruding order in the vehicle and outputs the noise to the vehicle through the audio output module;
the active noise compensation module utilizes an AGC algorithm, and obtains a desired noise signal according to the residual noise recombination of the environment in the vehicle, and outputs the desired noise signal into the vehicle through the audio output module.
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