CN114863902A - Noise active control system and control method for sound quality in vehicle - Google Patents

Noise active control system and control method for sound quality in vehicle Download PDF

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CN114863902A
CN114863902A CN202210491257.6A CN202210491257A CN114863902A CN 114863902 A CN114863902 A CN 114863902A CN 202210491257 A CN202210491257 A CN 202210491257A CN 114863902 A CN114863902 A CN 114863902A
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signal
unit
control
audio information
rotating speed
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Inventor
刘绍娜
刘崇亮
吕红明
陈远晟
高林枫
陆颖
唐钰恒
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Yancheng Institute of Technology
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Yancheng Institute of Technology
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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
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • 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
    • 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
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses a noise active control system for sound quality in a vehicle, which comprises a rotating speed acquisition unit, an audio information acquisition unit, a self-adaptive filtering unit, a sound output unit and an error signal detection unit, wherein the rotating speed acquisition unit is used for acquiring rotating speed information of an engine and generating a rotating speed signal X (n), and the audio information acquisition unit acquires audio information characteristic quantity A related to effective audio signals in the vehicle k (n), the adaptive filtering unit is based on the rotating speed signal X (n) and the related audio information characteristic quantity A k (n) generating a control signal y (n), the sound output unit outputting a corresponding control sound based on the control signal y (n), the error signal detection unit collecting residual noise caused by interference between a control target sound and the control sound at a control point to detect an error signal e (n) corresponding to the residual noise, advantageous effects of the present invention: by grading the noise of the automobile engine, the targeted control is implemented, the sound quality in the automobile can be improved, and the normal of effective sounds such as music, conversation and the like is ensuredAnd (6) receiving.

Description

Noise active control system and control method for sound quality in vehicle
Technical Field
The invention relates to the technical field of noise and vibration, in particular to a noise active control system for sound quality in a vehicle and a control method thereof.
Background
The noise in the vehicle mainly comprises the noise of the engine and the noise transmitted into the vehicle from the external environment, the noise transmitted into the vehicle from the external environment accounts for a relatively small proportion due to the existence of the vehicle compartment, and the noise of the engine is mainly transmitted into the vehicle compartment through the shell. Most of the traditional noise control is to increase the structural damping to achieve the purpose of controlling the noise by arranging sound absorption materials, and belongs to passive control. The passive control has good control effect on the medium-high frequency noise. The noise of the engine is mainly low-frequency noise, and if the traditional passive noise reduction technology is used for controlling the low-frequency noise, a high-volume sound-absorbing material is often needed for suppressing the noise, so that the design concept of light weight of an automobile is not met.
The active control technology for the noise in the vehicle is mainly applied to low-frequency noise such as engine noise. The reference signal collected by the engine noise active control system is generally an engine rotating speed signal, and a notch filter coefficient is designed to drive a vehicle door or a headrest loudspeaker so as to eliminate the order noise of the engine.
In the technique disclosed in patent document No.3-178845, since the step size parameter is reduced according to the output level of the effective audio signal, even if the effective audio signal having a frequency close to the control signal y (n) is used as the error signal e (n) to update the filter coefficient w (n), the adaptation speed of the effective audio signal is reduced. On the other hand, in the case where the valid audio signal is changed to a frequency other than the frequency in the vicinity of the control signal y (n), even when the value of the filter coefficient w (n) erroneously updated by the valid audio signal is changed to a normal value, the adaptive processing is performed using the reduced step size parameter, which results in the generation time of the residual abnormal noise being extended.
Disclosure of Invention
The present invention is directed to a system and a method for actively controlling noise in vehicle interior sound quality, so as to solve the above-mentioned problems.
In order to achieve the purpose, the invention provides the following technical scheme: the noise active control system for the sound quality in the vehicle comprises a rotating speed acquisition unit, an audio information acquisition unit, a self-adaptive filtering unit, a sound output unit and an error signal detection unit, wherein the rotating speed acquisition unit is used for acquiring rotating speed information of an engine and generating a rotating speed signal X (n), and the audio information acquisition unit acquires audio information characteristic quantity A related to effective audio signals in the vehicle k (n), the adaptive filtering unit is based on the rotating speed signal X (n) and the related audio information characteristic quantity A k (n) generating a control signal y (n), the sound output unit outputting a corresponding control sound based on the control signal y (n), and the error signal detection unit collecting residual noise caused by interference between the control target sound and the control sound at the control point to detect an error signal e (n) corresponding to the residual noise.
As a further scheme of the invention: the adaptive filtering unit comprises a reference signal generator, a control signal generator, a step length setting unit and a filtering coefficient updating unit, wherein the reference signal generator generates a reference signal based on the rotating speed input to the adaptive filtering unit, the control signal generator multiplies the rotating speed signal by a filtering coefficient to generate a control signal, the step length setting unit is used for setting a step length parameter for controlling the updating amount of the filtering coefficient, the filtering coefficient updating unit sets a step length adjusting coefficient according to the characteristic quantity of the audio information and the change of the control signal to further adjust the step length parameter, and the filtering coefficient is updated by the step length adjusting coefficient based on the reference signal and the error signal to reduce the residual noise.
The active noise control method for the interior sound quality provided by the active noise control system for the interior sound quality comprises the following steps:
the method comprises the following steps: obtaining engine rotating speed information through a rotating speed obtaining unit, generating a rotating speed signal X (n), and generating an engine base2N frequency multiplication component of frequency: x 2 (n)，X 4 (n)，X 8 (n) inputting the audio information into the adaptive filtering unit, and simultaneously acquiring the audio information characteristic quantity A of the effective audio information in the vehicle by using the audio information acquisition unit k (n)；
Step two: based on the rotating speed signal X (n) and the characteristic quantity A of the effective audio information in the vehicle through the self-adaptive filtering unit k (n) multiplying the respective frequencies of the output Y by the order of adaptive filtering 2 (n)，Y 4 (n)，Y 8 (n) order component Y k (n) superimposing and generating a control signal y (n) and outputting the control signal y (n) to the sound output unit;
step three: the noise after the control in the vehicle is collected through the error signal detector, and an error signal E (n) is generated and is used for being input into the self-adaptive filtering unit to update the filtering parameters.
As a further scheme of the invention: the control signal generator passes the k-order component X of the rotation speed signal X (n) k (n) multiplying by a filter coefficient W k (n) generating a k-th order component Y of the control signal Y (n) k (n) reacting Y k (n) outputting the modulated output signal to the control sound output unit;
the filter coefficient updating unit is based on the reference signal R k (n) and error signal E (n), updating filter coefficient W in turn k (n) and passing the updated filter coefficients to the control signal generator;
the step length setting unit is based on the k-order component X of the rotating speed X (n) k Frequency fluctuation in (n) to set the step size parameter μ k of the k-order component;
the audio information processor calculates the audio information characteristic quantity A based on the effective audio signal A (n) from the audio information acquisition unit k (n)。
As a further scheme of the invention: when the audio information characteristic quantity A k When the amplitude information of (n) becomes greater than or equal to a threshold value, a filter coefficient updating unit updates a k-order component Y in a control signal Y (n) k (n) and the k-th order component Y in the control signal Y (n +1) of the next sample k The absolute values of (n +1) are compared, and when the change of the control signal Y (n) tends to decrease, the order component V of the step length adjustment coefficient V (n) k (n) is set to be longer than the normal time with respect to the step parameter μ k, and the step adjustment coefficient V is used k (n) to update the filter coefficients.
Compared with the prior art, the invention has the beneficial effects that: by grading the noise of the automobile engine, the targeted control is implemented, meanwhile, the sound quality in the automobile can be improved, the normal reception of effective sounds such as music and conversation is guaranteed, the noise of the engine is actively reduced at a control point, and the riding comfort of the automobile is improved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic control flow diagram of the present invention;
fig. 2 is a schematic diagram of an adaptive filter structure according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, in an embodiment of the present invention, an active noise control system for vehicle interior sound quality includes a rotation speed obtaining unit, an audio information obtaining unit, a self-adaptive filtering unit, a sound output unit, and an error signal detecting unit; the rotating speed acquisition unit is used for acquiring rotating speed information of an engine and generating a rotating speed signal X (n), and the audio information acquisition unit acquires audio information characteristic quantity A related to an effective audio signal in the vehicle k (n) the adaptive filter unit is based on a rotation speedSignal X (n) and characteristic quantity A of audio information relating to a valid audio signal in a vehicle k (n) generating a control signal; the sound output unit outputs a control sound corresponding to the control signal y (n); the error signal detector collects residual noise caused by interference between the control target sound and the control sound at the control point to detect an error signal e (n) corresponding to the residual noise.
Furthermore, the adaptive filtering unit comprises a reference signal generator, a control signal generator, a step size setting unit and a filtering coefficient updating unit, wherein the reference signal generator generates a reference signal based on the rotating speed input to the adaptive filtering unit, the control signal generator multiplies the rotating speed signal by a filtering coefficient to generate a control signal, the step size setting unit is used for setting a step size parameter for controlling the updating amount of the filtering coefficient, the filtering coefficient updating unit sets a step size adjusting coefficient according to the change of the audio information characteristic quantity and the control signal to further adjust the step size parameter, and updates the filtering coefficient by using the step size adjusting coefficient based on the reference signal and the error signal to reduce the residual noise.
A noise active control method for sound quality in a vehicle comprises the following steps:
the method comprises the following steps: the rotating speed obtaining unit obtains engine rotating speed information and generates a rotating speed signal X (N), and a 2N frequency multiplication component related to the engine fundamental frequency is generated: x 2 (n)，X 4 (n)，X 8 (n) inputting the audio information into the adaptive filtering unit, and simultaneously acquiring the audio information characteristic quantity A of the effective audio information in the vehicle by using the audio information acquisition unit k (n)；
Specifically, for an in-line four cylinder engine, the even harmonic component, i.e., fundamental frequency f, is due to one duty cycle of two revolutions of the crankshaft 0 Becomes a main component of the rotation speed signal X (N), namely, generates a rotation speed signal containing a second-order component X 2 (n), fourth order component X 4 (n), eighth order component X 8 (n) the rotating speed signal X (n) is output to the self-adaptive filtering unit; alternatively, the component of the speed signal is not limited to the sub-frequency f 0 From the fundamental frequency f 8 And fundamental frequency f 0 Is selected from the harmonic components of (1).
Step two: based on the rotating speed signal X (n) and the characteristic quantity A of the effective audio information in the vehicle through the self-adaptive filtering unit k (n) multiplying the respective frequencies of the output Y by the order of adaptive filtering 2 (n)，Y 4 (n)，Y 8 (n) order component Y k (n) superimposing and generating a control signal y (n) and outputting the control signal y (n) to the sound output unit; specifically, the control signal generator generates the rotation speed signal X (n) by converting the k-order component X of the rotation speed signal X (n) k (n) multiplied by a filter coefficient W k (n) generating a k-th order component Y of the control signal Y (n) k Filter coefficient W of k-order component at (n), time (n +1) k The update of (n +1) can be expressed as: w k (n+1)＝W k (n)-μk·E(n)·R k (n); optionally, the filter coefficient update rule in this embodiment only refers to the simplest update rule, and is not limited to formal.
Step three: collecting the noise after the control in the vehicle through an error signal detector, and generating an error signal E (n) for inputting to a self-adaptive filtering unit to update filtering parameters; optionally, the adaptive algorithm in the filter coefficient updating unit adopts a steepest descent method, and the filter coefficient W k (n) converge to an optimum value, thereby recursively reducing the error signal e (n), i.e. reducing the residual noise at the control points.
Example (b):
fundamental frequency f when the rotation speed of the inline four-cylinder engine is 2400rpm 0 Is 40Hz, second order component f 2 Is 80 Hz. At this time, when the music reproducing apparatus reproduces a signal including a frequency component of 80Hz, the filter coefficient W2 is updated while the signal from the music reproducing apparatus is reflected on the error signal e (n). It is assumed that after the filter coefficient W2 is erroneously updated for a long time, the signal containing the frequency component of 80Hz output by the music reproducing apparatus is changed to a music signal containing the frequency component of 50Hz without changing the amplitude. In this case, since the value of the filter coefficient W2 is updated with a decreasing trend, the second-order component Y in the control signal Y (n) 2 (n) and second order component Y in control 2 Absolute value of (n +1) the signal Y (n +1) of the next sample when compared with each otherTends to decrease when the control signal Y (n) tends to decrease and the audio information characteristic quantity A tends to decrease k (n) when the value is greater than or equal to the threshold value, multiplying the step size parameter mu 2 by the step size adjustment coefficient V 2 (n) to increase the tracking rate. Therefore, the filter coefficient can be changed to a value of a normal state in a short time, and the generation time of the residual abnormal noise of 80Hz can be shortened.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. The utility model provides a noise initiative control system of interior sound quality of car, includes rotational speed acquisition unit, audio information acquisition unit, self-adaptation filter unit, sound output unit and error signal detecting element, its characterized in that: the rotation speed acquisition unit is used for acquiring rotation speed information of an engine and generating a rotation speed signal X (n), and the audio information acquisition unit acquires audio information characteristic quantity A related to an effective audio signal in the vehicle k (n), the adaptive filtering unit is based on the rotating speed signal X (n) and the related audio information characteristic quantity A k (n) generating a control signal Y (n), a sound output unit outputting a corresponding control sound based on the control signal Y (n), and the error signal detection unitResidual noise caused by interference between the control target sound and the control sound at the control point is collected to detect an error signal e (n) corresponding to the residual noise.
2. The active noise control system for acoustic quality in a vehicle according to claim 1, wherein: the adaptive filtering unit comprises a reference signal generator, a control signal generator, a step length setting unit and a filtering coefficient updating unit, wherein the reference signal generator generates a reference signal based on the rotating speed input to the adaptive filtering unit, the control signal generator multiplies the rotating speed signal by a filtering coefficient to generate a control signal, the step length setting unit is used for setting a step length parameter for controlling the updating amount of the filtering coefficient, the filtering coefficient updating unit sets a step length adjusting coefficient according to the characteristic quantity of the audio information and the change of the control signal to further adjust the step length parameter, and the filtering coefficient is updated by the step length adjusting coefficient based on the reference signal and the error signal to reduce the residual noise.
3. The active noise control method for the interior sound quality is provided according to an active noise control system for the interior sound quality, and is characterized by comprising the following steps of:
the method comprises the following steps: obtaining engine rotating speed information through a rotating speed obtaining unit, generating a rotating speed signal X (N), and generating a 2N frequency multiplication component related to the engine fundamental frequency: x 2 (n)，X 4 (n)，X 8 (n) inputting the audio information into the adaptive filtering unit, and simultaneously acquiring the audio information characteristic quantity A of the effective audio information in the vehicle by using the audio information acquisition unit k (n)；
Step two: based on the rotating speed signal X (n) and the characteristic quantity A of the effective audio information in the vehicle through the self-adaptive filtering unit k (n) multiplying the respective frequencies of the output Y by the order of adaptive filtering 2 (n)，Y 4 (n)，Y 8 (n) order component Y k (n) superimposing and generating a control signal y (n) and outputting the control signal y (n) to the sound output unit;
step three: the noise after the control in the vehicle is collected through the error signal detector, and an error signal E (n) is generated and is used for being input into the self-adaptive filtering unit to update the filtering parameters.
4. The active noise control system for acoustic quality in a vehicle according to claim 3, wherein: the control signal generator passes the k-order component X of the rotation speed signal X (n) k (n) multiplying by a filter coefficient W k (n) generating a k-th order component Y of the control signal Y (n) k (n) reacting Y k (n) outputting the modulated output signal to the control sound output unit;
the filter coefficient updating unit is based on the reference signal R k (n) and error signal E (n), updating filter coefficient W in turn k (n) and passing the updated filter coefficients to the control signal generator;
the step length setting unit is based on the k-order component X of the rotating speed X (n) k Frequency fluctuation in (n) to set the step size parameter μ k of the k-order component;
the audio information processor calculates the audio information characteristic quantity A based on the effective audio signal A (n) from the audio information acquisition unit k (n)。
5. The active noise control system for acoustic quality in a vehicle according to claim 3, wherein: when the audio information characteristic quantity A k When the amplitude information of (n) becomes greater than or equal to a threshold value, a filter coefficient updating unit updates a k-order component Y in a control signal Y (n) k (n) and the k-th order component Y in the control signal Y (n +1) of the next sample k The absolute values of (n +1) are compared, and when the change of the control signal Y (n) tends to decrease, the order component V of the step length adjustment coefficient V (n) k (n) is set to be longer than the normal time with respect to the step parameter μ k, and the step adjustment coefficient V is used k (n) to update the filter coefficients.
CN202210491257.6A 2022-05-07 2022-05-07 Noise active control system and control method for sound quality in vehicle Withdrawn CN114863902A (en)

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CN202210491257.6A CN114863902A (en) 2022-05-07 2022-05-07 Noise active control system and control method for sound quality in vehicle

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