CN107757537B - Sound control method and device for vehicle-mounted engine - Google Patents
Sound control method and device for vehicle-mounted engine Download PDFInfo
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- CN107757537B CN107757537B CN201610670372.4A CN201610670372A CN107757537B CN 107757537 B CN107757537 B CN 107757537B CN 201610670372 A CN201610670372 A CN 201610670372A CN 107757537 B CN107757537 B CN 107757537B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/037—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for occupant comfort, e.g. for automatic adjustment of appliances according to personal settings, e.g. seats, mirrors, steering wheel
- B60R16/0373—Voice control
Abstract
A sound control method and a device for an on-board engine are provided, wherein the method comprises the following steps: driving a sound output device in the vehicle to generate sound according to a first sound signal, wherein a sound collection device in the vehicle performs signal collection in response to the sound generation of the sound output device; generating a second sound signal corresponding to the first sound signal according to a collection result of sound collection equipment inside the vehicle; calculating a transfer function from the first sound signal to the second sound signal; acquiring a third sound signal related to the sound of the engine of the vehicle, wherein the third sound signal is generated according to a fourth sound signal acquired by sound acquisition equipment in the vehicle; generating a control sound signal according to the third sound signal and the transfer function, wherein the control sound signal is used for being superposed with the third sound signal so as to reduce or enhance the sound of the engine. The method and the device can improve the control flexibility and reduce the cost.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a sound control method and device for a vehicle-mounted engine.
Background
At present, the in-vehicle noise reduction technology is widely applied, particularly in brands and vehicle types with higher price. At present, the main form of in-vehicle noise reduction is embedded development in a vehicle-mounted system, so that the cost is high and the flexibility is poor.
Disclosure of Invention
The technical problem to be solved by the invention is to improve the flexibility of the sound control method of the vehicle-mounted engine and reduce the cost.
In order to solve the above technical problem, an embodiment of the present invention provides a sound control method for a vehicle-mounted engine, including: driving a sound output device in the vehicle to generate sound according to a first sound signal, wherein a sound collection device in the vehicle performs signal collection in response to the sound generation of the sound output device; generating a second sound signal corresponding to the first sound signal according to a collection result of sound collection equipment inside the vehicle; calculating a transfer function from the first sound signal to the second sound signal; acquiring a third sound signal related to the sound of the engine of the vehicle, wherein the third sound signal is generated according to a fourth sound signal acquired by sound acquisition equipment in the vehicle; generating a control sound signal according to the third sound signal and the transfer function, wherein the control sound signal is used for being superposed with the third sound signal so as to reduce or enhance the sound of the engine.
Optionally, obtaining a third sound signal related to sound of an engine of the vehicle comprises: acquiring a current rotating speed of an engine of the vehicle; estimating the frequency of the order sound signal of the engine according to the current rotating speed of the engine; and selecting from the fourth sound signal according to the estimated frequency of the order sound signal to obtain the third sound signal.
Optionally, the frequency of the order sound signal of the engine includes a plurality of order frequencies, and selecting in the fourth sound signal according to the estimated frequency of the order sound signal includes: selecting a sound signal rate matching at least one of the plurality of order frequencies.
Optionally, generating a control sound signal according to the third sound signal and the transfer function includes: generating a pre-output signal from the third sound signal; performing compensation processing on the pre-output signal according to the transfer function to obtain the control sound signal; outputting the control sound signal through a sound output device inside the vehicle.
Optionally, the sound control method for the vehicle-mounted engine may further include: acquiring a current rotating speed of an engine of the vehicle; and inquiring a pre-stored sound signal to obtain a sound signal matched with the current rotating speed, and outputting the sound signal through sound output equipment in the vehicle, wherein the pre-stored sound signal comprises sound signals which continuously change corresponding to different rotating speeds.
Optionally, the transfer function is indicative of a time, amplitude and phase relationship between the first sound signal and the second sound signal.
The embodiment of the invention also provides a sound control device of a vehicle-mounted engine, which comprises: the first sound signal output unit is suitable for driving a sound output device in the vehicle to generate sound according to the first sound signal; a second sound signal generating unit adapted to control the sound collection device inside the vehicle to collect a signal in response to the sound output device, and generate a second sound signal corresponding to the first sound signal according to a collection result of the sound collection device inside the vehicle; a transfer function calculation unit adapted to calculate a transfer function from the first sound signal to the second sound signal; a third sound signal generation unit adapted to acquire a third sound signal relating to a sound of an engine of the vehicle, the third sound signal being generated from a fourth sound signal acquired by a sound acquisition device inside the vehicle; a control sound signal generation unit adapted to generate a control sound signal based on the third sound signal and the transfer function, the control sound signal being for superposition with the third sound signal to reduce or enhance the sound of the engine.
Optionally, the third sound signal generating unit includes: a first current rotation speed acquisition unit adapted to acquire a current rotation speed of an engine of the vehicle; a frequency calculation unit adapted to estimate a frequency of an order sound signal of the engine according to a current rotational speed of the engine; and the selecting unit is suitable for selecting from the fourth sound signal according to the estimated frequency of the order sound signal to obtain the third sound signal.
Optionally, the frequency of the order sound signal of the engine includes a plurality of order frequencies, and the selecting unit is adapted to select a sound signal rate matching at least one of the plurality of order frequencies in the fourth sound signal.
Optionally, the control sound signal generating unit includes: a pre-output signal generation unit adapted to generate a pre-output signal from the third sound signal; the compensation processing unit is suitable for performing compensation processing on the pre-output signal according to the transfer function to obtain the control sound signal; a first output unit adapted to output the control sound signal through a sound output device inside the vehicle.
Optionally, the vehicle-mounted engine sound control device may further include: a second current rotation speed acquisition unit adapted to acquire a current rotation speed of an engine of the vehicle; and the second output unit is suitable for inquiring a pre-stored sound signal to obtain a sound signal matched with the current rotating speed and outputting the sound signal through sound output equipment in the vehicle, wherein the pre-stored sound signal comprises sound signals which continuously change corresponding to different rotating speeds.
Optionally, the transfer function is indicative of a time, amplitude and phase relationship between the first sound signal and the second sound signal.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
through calculating the transfer function, the control sound signal is calculated according to the third sound signal and the transfer function related to the engine of the vehicle, and the sound of the engine is reduced or enhanced, so that the sound of the engine can be controlled more flexibly, and the sound control of the engine in the vehicle can better meet the requirements of users. The second sound signal and the third sound signal can be acquired through a microphone in the vehicle, and the first sound signal and the control sound signal can be output through sound output equipment in the vehicle, so that the cost can be reduced. By calculating the transfer function, the system characteristics of the vehicle sound control system can be fully considered when generating the control sound signal, so that the sound of the engine can be more accurately controlled.
Drawings
FIG. 1 is a schematic diagram of the structure and connection of a vehicle-mounted engine sound controller according to an embodiment of the present invention;
FIG. 2 is a flow chart of a vehicle engine voice control method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of obtaining a third acoustic signal related to the sound of the engine of the vehicle in an embodiment of the present invention;
FIG. 4 is a method for generating a control sound signal based on the third sound signal and the transfer function according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vehicle-mounted engine sound control device according to an embodiment of the invention.
Detailed Description
As mentioned above, the noise reduction technology in the vehicle is widely used, especially in the brands and vehicles with higher price. At present, the main form of in-vehicle noise reduction is embedded development in a vehicle-mounted system, so that the cost is high and the flexibility is poor.
The inventor researches and discovers that the existing in-vehicle noise reduction is mostly integrated in a vehicle-mounted system of a vehicle before the vehicle leaves a factory, and the flexibility is poor; and at present, the noise reduction of the vehicle is mainly integrated in high-end brands and high-end vehicle types, and the vehicle which leaves the factory and is not integrated with the noise reduction system of the vehicle is difficult to be developed secondarily so as to integrate the noise reduction system of the vehicle. In addition, in the prior art, only attention is usually paid to vehicle noise reduction, the flexibility is poor, and the diversified requirements of a user on vehicle-mounted engine sound control are difficult to meet.
The vehicle-mounted engine sound control method in the embodiment of the invention can utilize the existing sound output equipment and sound collection equipment in the vehicle, and can realize plug and play without carrying out embedded development on the original vehicle-mounted system, so the cost is lower and the realization is convenient; the sound control method of the vehicle-mounted engine in the embodiment of the invention can reduce or enhance the sound of the engine, so that more choices and more flexibility are provided, and the diversified requirements of users can be met; in the sound control method of the vehicle-mounted engine in the embodiment of the invention, the transfer function of the loop formed by the sound output device and the sound collection device is calculated, and the transfer function is referred when the control sound signal is generated, so that the sound of the engine can be more effectively reduced or enhanced by the control sound signal.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
FIG. 1 is a schematic diagram of a vehicle-mounted engine sound controller according to an embodiment of the present invention.
The On-Board engine sound controller 10 may be connected to an On-Board Diagnostic (OBD) 11, a sound collection device 12 inside the vehicle, a power supply 13 of the vehicle, and a sound output device 14. The in-vehicle engine sound controller 10 may be an external in-vehicle device instead of being integrated in the vehicle. For example, the in-vehicle engine sound controller 10 may be a portable in-vehicle device coupled to various components of the vehicle by suitable connections.
The on-board diagnostic system 11 may provide the on-board engine sound controller 10 with information related to the engine of the vehicle, and the digital signal conditioning module 101 may be connected to an OBD decoder of the on-board diagnostic system 11. The digital signal conditioning module 101 may be connected to the OBD decoder of the on-board diagnostic system 11 in a wired or wireless manner. The digital signal conditioning module 101 processes the acquired digital signal related to the engine to obtain a digital signal suitable for the digital signal processor 102 to process, and then sends the digital signal reflecting the working condition of the engine to the digital signal processor 102.
The sound collection device 12 may collect a sound signal inside the vehicle, and may be an in-vehicle microphone. The sound collection device 12 may be disposed on an interior component of the vehicle (e.g., a headrest of a head of a driver, an interior mirror, etc.), and connected to the sound controller 10 of the vehicle-mounted engine in a wired or wireless manner to provide an interior sound pressure signal.
The sound collection device 12 may be connected to the first analog signal conditioning module 103, and the first analog signal conditioning module 103 may perform filtering and other processing on the sound signal collected by the sound collection device 12, send the processed signal to the analog-to-digital converter 104, convert the received analog signal into a digital signal by the analog-to-digital converter 104, and send the digital signal to the digital signal processor 102.
The power supply 13 may supply power to various modules in the vehicle engine sound controller 10, and the vehicle engine sound controller 10 may be connected to the power supply 13 through an interface of a vehicle cigarette lighter. The vehicle-mounted engine sound controller 10 may further include a power management module (not shown) that rectifies and regulates the input of the power supply 13 so that the output of the power supply 13 is suitable for the vehicle-mounted engine sound controller 10.
The sound output device 14 may be a car audio system capable of outputting sound signals according to the control of the digital signal processor 102. The sound output device 14 may obtain the audio to be output via the digital-to-analog converter 105 from the second analog signal conditioning module 107 in a wired manner, for example, from the second analog signal conditioning module 107 through an audio input interface (AUX) or a USB interface; the audio to be output may also be obtained in a wireless manner, for example, the second analog signal conditioning module 107 sends the signal to a signal fm transmission module (not shown), and the signal fm transmission module sends the audio signal to be output to the sound output device 14.
The vehicle-mounted engine sound controller 10 may further include a memory 106 for storing sound signals that continuously change corresponding to different rotation speeds, and the digital signal processor 102 controls the sound output device 14 to output corresponding sound signals according to the current rotation speed of the engine.
The in-vehicle engine sound controller 10 may also be configured with a control panel or wirelessly receive user instructions via other smart devices (e.g., cell phone, tablet) to enhance or reduce the in-vehicle engine related sound.
It can be seen that the vehicle-mounted engine sound controller 10 in the embodiment of the present invention may combine the sound collection device 12, the sound output device 14, and the vehicle-mounted diagnosis system 11 to form a vehicle-mounted engine sound control system to collectively control the vehicle-mounted engine sound. The vehicle-mounted engine sound controller 10 can be conveniently connected with other components in a vehicle-mounted engine sound control system, and can be used in a plug-and-play mode, so that the cost is greatly reduced.
The concrete control method of the vehicle-mounted engine sound controller 10 in the embodiment of the invention and the corresponding advantageous effects can refer to the vehicle-mounted engine sound control method shown in fig. 2.
FIG. 2 is a flow chart of a vehicle engine sound control method according to an embodiment of the invention.
In step S21, a sound output device in the vehicle interior is driven to generate sound according to the first sound signal, and the sound collection device in the vehicle interior collects signals in response to data of the sound output device.
The sound output device inside the vehicle may be a car audio device, a speaker, and the sound collection device inside the vehicle may be a microphone. The sound output device and the sound collection device may be devices that are self-contained in the vehicle, and these devices may also be used by the in-vehicle system.
In a specific implementation, the first sound signal may be a white noise signal, which may be an analog signal or a digital signal. When the first sound signal is a digital signal, driving a sound output device inside the vehicle according to the first sound signal may be to convert the first sound signal into an analog signal and then drive the sound output device to generate sound.
In step S22, a second sound signal corresponding to the first sound signal is generated based on the collection result of the sound collection device inside the vehicle.
The second sound signal may be obtained by processing a sound signal collected by a sound collection device inside the vehicle, for example, in the embodiment shown in fig. 1, the second sound signal may be obtained by processing the first analog signal conditioning module 103 and the analog-to-digital converter 104 in fig. 1. The second sound signal may correspond to the first sound signal in form, for example, when the first sound signal is a digital signal, the second sound signal in form of the digital signal is obtained by performing processing such as filtering and analog-to-digital conversion on the sound signal collected by the sound collection device inside the vehicle.
In step S23, a transfer function from the first sound signal to the second sound signal is calculated.
In a specific implementation, the first sound signal may be converted into an analog signal through analog-to-digital conversion or the like, and the analog signal is output by the sound output device. A microphone of sound collection equipment in the vehicle can be used as sound output equipment to collect the sound in response to the sound output of the sound output equipment, and the collected result is subjected to filtering, analog-to-digital conversion and other processing to obtain a second sound signal.
The second sound signal is the first sound signal through the sound control system, the transfer function reflects the characteristics of the sound control system, i.e. the system characteristics from the electric signal to the sound signal and then to the electric signal. The sound control system, that is, the system implementing the vehicle-mounted engine sound control method according to the embodiment of the present invention, may be, for example, a system of the vehicle-mounted engine sound control method shown in fig. 1.
In a specific implementation, the transfer function may be indicative of a time, amplitude, and phase relationship between the first sound signal and the second sound signal.
In the system of the vehicle-mounted engine sound control method shown in fig. 1, the transfer function reflects the time, amplitude and phase relationship between the original digital signal generated by the digital signal processor 102, and the original digital signal is output by the sound output device 14 via the second analog signal conditioning module 107 and other modules, collected by the sound collection device 12, and finally transmitted to the digital signal processor 102 again.
In step S24, a third sound signal relating to the sound of the engine of the vehicle is acquired, the third sound signal being generated from a fourth sound signal acquired by a sound acquisition device inside the vehicle.
In a specific implementation, a flowchart of a method of obtaining a third sound signal related to sound of an engine of the vehicle may be seen in fig. 3.
In step S31, the current rotation speed of the engine of the vehicle is acquired.
In step S32, the frequency of the order sound signal of the engine is estimated based on the current rotational speed of the engine.
The order sound signal may also be called order noise, and there may be multiple orders of sound signals corresponding to the speed of rotation of one engine. The frequency estimation of the order sound signal corresponding to the current engine speed may be performed based on empirical data.
In step S33, the fourth sound signal is selected according to the estimated frequency of the order sound signal to obtain the third sound signal.
The selection of sound signals having a certain correlation with the estimated frequency of the order sound signal may be performed in the fourth sound signal. In a specific implementation, the sound signal matched with the frequency of the order sound signal can be selected as the third sound signal in the fourth sound signal. For example, a sound signal having an error range from the frequency of the sub sound signal within a preset range may be selected as the third sound signal.
In a specific implementation, the frequency of the order sound signal of the engine includes a plurality of order frequencies, the order sound signal estimated according to the engine speed may include sound signals of a plurality of frequencies, and a sound signal matching at least one of the sound signals of a plurality of frequencies may be selected as the third sound signal in the fourth sound signal.
With continued reference to fig. 2, in step S25, a control sound signal is generated based on the third sound signal and the transfer function, the control sound signal being for superimposition with the third sound signal to reduce or enhance the sound of the engine.
In the prior art, engine sound reduction is more commonly used, but in some scenarios, engine sound enhancement is required. For example, in the case where the user needs to judge the engine speed or the like by the engine sound, the engine sound needs to be enhanced. Therefore, in the embodiment of the invention, the sound of the engine can be enhanced or reduced according to the needs of users, so that the sound of the engine can be more flexibly controlled, and the diversified needs of the users can be further met.
In a specific implementation, the method for generating a control sound signal according to the third sound signal and the transfer function may be seen in fig. 4.
In step S41, a pre-output signal is generated from the third sound signal.
Generating the pre-output signal from the third sound signal may include generating a pre-output signal for enhancing an engine sound or generating a pre-output signal for attenuating an engine sound. When generating the pre-output signal for enhancing the engine sound, the phase of the pre-output signal may be the same as the third sound signal; when the preliminary output signal for attenuating the engine sound is generated, the phase of the preliminary output signal may be opposite to the third sound signal.
In particular implementations, various algorithms may be utilized to generate the pre-output signal, for example, a least mean square algorithm, a recursive least squares algorithm, an adaptive filtering algorithm, etc. may be employed.
In step S42, the pre-output signal is compensated according to the transfer function, so as to obtain the control sound signal.
Because the signal can be delayed and changed in phase after passing through the vehicle-mounted engine sound control system, after the pre-output signal is obtained, the pre-output signal can be compensated according to the transfer function, so that the control sound signal can be effectively superposed with a third sound signal after being output, and the effect of reducing or enhancing noise is achieved.
Because the transfer function is obtained by calibrating according to the actual condition of the vehicle, the pre-output signal can be more effectively compensated according to the transfer function, and then a more accurate control sound signal can be obtained, so that the noise of an engine in the vehicle can be more effectively reduced or enhanced.
In step S43, the control sound signal is output through a sound output device inside the vehicle.
In a specific implementation, the vehicle-mounted engine sound control method may further include: acquiring a current rotating speed of an engine of the vehicle; and inquiring a pre-stored sound signal to obtain a sound signal matched with the current rotating speed, and outputting the sound signal through sound output equipment in the vehicle, wherein the pre-stored sound signal comprises sound signals which continuously change corresponding to different rotating speeds.
In an embodiment of the present invention, it is possible to reduce noise of the engine sound of the vehicle itself and output a pre-stored sound signal matching the current rotational speed direction of the engine of the vehicle.
In the embodiment of the invention, the pre-stored sound signal is a sound signal which continuously changes corresponding to different rotating speeds, so the output sound signal can be a continuous and smooth sound signal, and the user experience can be improved.
The embodiment of the invention also provides a sound control device of the vehicle-mounted engine, and the structural schematic diagram of the sound control device is shown in figure 5.
The in-vehicle engine sound control device 50 may include:
a first sound signal output unit 51 adapted to drive a sound output device inside the vehicle to sound in accordance with a first sound signal;
a second sound signal generating unit 52 adapted to control the sound collection device inside the vehicle to collect a signal in response to the sound output device emitting sound, and generate a second sound signal corresponding to the first sound signal according to a collection result of the sound collection device inside the vehicle;
a transfer function calculation unit 53 adapted to calculate a transfer function from the first sound signal to the second sound signal;
a third sound signal generation unit 54 adapted to acquire a third sound signal relating to a sound of an engine of the vehicle, the third sound signal being generated from a fourth sound signal acquired by a sound acquisition device inside the vehicle;
a control sound signal generating unit 55 adapted to generate a control sound signal based on the third sound signal and the transfer function, the control sound signal being for superimposing with the third sound signal to reduce or enhance the sound of the engine.
Wherein the third sound signal generating unit 54 may include:
a first current rotation speed acquisition unit adapted to acquire a current rotation speed of an engine of the vehicle;
a frequency calculation unit adapted to estimate a frequency of an order sound signal of the engine according to a current rotational speed of the engine;
and the selecting unit is suitable for selecting from the fourth sound signal according to the estimated frequency of the order sound signal to obtain the third sound signal.
In a specific implementation, the frequency of the order sound signal of the engine includes a plurality of order frequencies, and the selecting unit is adapted to select a sound signal rate matching at least one order frequency of the plurality of order frequencies in the fourth sound signal.
The control sound signal generation unit 55 may include:
a pre-output signal generation unit adapted to generate a pre-output signal from the third sound signal;
the compensation processing unit is suitable for performing compensation processing on the pre-output signal according to the transfer function to obtain the control sound signal;
a first output unit adapted to output the control sound signal through a sound output device inside the vehicle.
In a specific implementation, the vehicle-mounted engine sound control device 50 may further include:
a second current rotation speed acquisition unit adapted to acquire a current rotation speed of an engine of the vehicle;
and the second output unit is suitable for inquiring a pre-stored sound signal to obtain a sound signal matched with the current rotating speed and outputting the sound signal through sound output equipment in the vehicle, wherein the pre-stored sound signal comprises sound signals which continuously change corresponding to different rotating speeds.
In a specific implementation, the transfer function is indicative of a time, amplitude and phase relationship between the first sound signal and the second sound signal.
The vehicle engine sound control device 50 may be located in one of the vehicle engine sound controllers shown in fig. 1. Specific implementation and beneficial effects of the vehicle-mounted engine sound control device 50 can be referred to as a vehicle-mounted engine sound control method, which is not described in detail herein.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A sound control method of an in-vehicle engine, characterized by comprising:
driving a sound output device in the vehicle to generate sound according to the first sound signal, wherein a sound collection device in the vehicle collects signals in response to the sound generated by the sound output device;
generating a second sound signal corresponding to the first sound signal according to a collection result of sound collection equipment inside the vehicle;
calculating a transfer function from the first sound signal to the second sound signal;
acquiring a third sound signal related to the sound of the engine of the vehicle, wherein the third sound signal is generated according to a fourth sound signal acquired by sound acquisition equipment in the vehicle;
acquiring a third sound signal related to sound of an engine of the vehicle includes:
acquiring a current rotating speed of an engine of the vehicle;
estimating the frequency of the order sound signal of the engine according to the current rotating speed of the engine;
selecting from the fourth sound signal according to the estimated frequency of the order sound signal to obtain the third sound signal;
the frequency of the order sound signal of the engine comprises a plurality of order frequencies, and selecting in the fourth sound signal according to the estimated frequency of the order sound signal comprises: selecting a sound signal rate matched with at least one order frequency in the plurality of order frequencies;
generating a control sound signal according to the third sound signal and the transfer function, wherein the control sound signal is used for being superposed with the third sound signal so as to reduce or enhance the sound of the engine.
2. The sound control method of a vehicle-mounted engine according to claim 1, characterized in that generating a control sound signal according to the third sound signal and the transfer function includes:
generating a pre-output signal from the third sound signal;
performing compensation processing on the pre-output signal according to the transfer function to obtain the control sound signal;
outputting the control sound signal through a sound output device inside the vehicle.
3. The sound control method of a vehicle-mounted engine according to claim 1, characterized by further comprising:
acquiring a current rotating speed of an engine of the vehicle;
and inquiring a pre-stored sound signal to obtain a sound signal matched with the current rotating speed, and outputting the sound signal through sound output equipment in the vehicle, wherein the pre-stored sound signal comprises sound signals which continuously change corresponding to different rotating speeds.
4. The sound control method of an in-vehicle engine according to claim 1, characterized in that the transfer function indicates a time, amplitude, and phase relationship between the first sound signal and the second sound signal.
5. A sound control device for a vehicle-mounted engine, comprising:
the first sound signal output unit is suitable for driving a sound output device in the vehicle to generate sound according to the first sound signal;
a second sound signal generating unit adapted to control a sound collecting device inside the vehicle to collect a signal in response to the sound output from the sound output device, and generate a second sound signal corresponding to the first sound signal according to a collection result of the sound collecting device inside the vehicle;
a transfer function calculation unit adapted to calculate a transfer function from the first sound signal to the second sound signal;
a third sound signal generation unit adapted to acquire a third sound signal relating to a sound of an engine of the vehicle, the third sound signal being generated from a fourth sound signal acquired by a sound acquisition device inside the vehicle;
the third sound signal generation unit includes:
a first current rotation speed acquisition unit adapted to acquire a current rotation speed of an engine of the vehicle;
a frequency calculation unit adapted to estimate a frequency of an order sound signal of the engine according to a current rotational speed of the engine;
the selecting unit is suitable for selecting the fourth sound signal according to the estimated frequency of the order sound signal to obtain the third sound signal; the frequency of the order sound signal of the engine includes a plurality of order frequencies, and the selecting unit is adapted to select a sound signal rate matching at least one order frequency of the plurality of order frequencies in the fourth sound signal;
a control sound signal generation unit adapted to generate a control sound signal based on the third sound signal and the transfer function, the control sound signal being for superposition with the third sound signal to reduce or enhance the sound of the engine.
6. The sound control device for the vehicle-mounted engine according to claim 5, wherein the control sound signal generation unit includes:
a pre-output signal generation unit adapted to generate a pre-output signal from the third sound signal;
the compensation processing unit is suitable for performing compensation processing on the pre-output signal according to the transfer function to obtain the control sound signal;
a first output unit adapted to output the control sound signal through a sound output device inside the vehicle.
7. The sound control device for the vehicle-mounted engine according to claim 5, characterized by further comprising:
a second current rotation speed acquisition unit adapted to acquire a current rotation speed of an engine of the vehicle;
and the second output unit is suitable for inquiring a pre-stored sound signal to obtain a sound signal matched with the current rotating speed and outputting the sound signal through sound output equipment in the vehicle, wherein the pre-stored sound signal comprises sound signals which continuously change corresponding to different rotating speeds.
8. The sound control apparatus of an in-vehicle engine according to claim 5, characterized in that the transfer function indicates a time, amplitude, and phase relationship between the first sound signal and the second sound signal.
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| CN1704760A (en) * | 2004-05-25 | 2005-12-07 | 曹广忠 | Automobile engine speed measurement apparatus and method |
| EP2871639B1 (en) * | 2013-11-08 | 2019-04-17 | Volvo Car Corporation | Method and system for masking noise |
| KR20160039951A (en) * | 2014-10-02 | 2016-04-12 | 현대모비스 주식회사 | Vehicle's external sound output system and method |
| CN105244016A (en) * | 2015-11-19 | 2016-01-13 | 清华大学深圳研究生院 | Active noise reduction system and method |
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