CN113903323B - Vehicle noise reduction system and car - Google Patents
Vehicle noise reduction system and car Download PDFInfo
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- 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
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- 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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- G—PHYSICS
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- 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
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Abstract
The invention discloses a vehicle noise reduction system and an automobile, wherein the vehicle noise reduction system comprises a noise pickup device, a sound playing device, a noise processing circuit, a vehicle-mounted controller and an active noise reduction module; a noise pickup for picking up first noise data; the noise processing circuit is connected with the noise pickup device and is used for processing the first noise data to form a second noise signal; the vehicle-mounted controller is used for receiving the vehicle state data and outputting the type of the target noise; the active noise reduction module is connected with the noise processing circuit and the vehicle-mounted controller and is used for processing the second noise signal according to the type of the target noise to form a third noise signal which is equal to the second noise signal in magnitude and opposite in phase; and the sound playing device is connected with the active noise reduction module and is used for playing the third noise signal. The technical scheme can eliminate noise generated under different vehicle state data and improve the noise reduction capability of the automobile.
Description
Technical Field
The invention relates to the technical field of vehicle noise reduction, in particular to a vehicle noise reduction system and an automobile.
Background
With the rapid development of global automobile and automobile electronic industry, the pursuit of people for the comfort level and entertainment performance of the space in the automobile is gradually strengthened. However, since the engine system of the vehicle or other structures inside the vehicle are prone to vibrate and generate large noise, when a user uses the electronic product of the vehicle to perform driving detection and entertainment, the user experiences poor experience in the driving process due to the large noise.
At present, the Noise reduction effect of an Active Noise Cancellation (ANC) technology in the automobile industry is very considerable. At present, the ANC technology of automobiles on the market mainly reduces noise through a sound system or a power amplifier system, and although the mode is superior to the traditional isolation noise reduction method, the sound system or the power amplifier system cannot monitor and manage the state of the whole automobile, so that the noise reduction of the automobiles cannot be carried out according to different automobile states, and the noise reduction capability of the automobiles is poor.
Disclosure of Invention
The embodiment of the invention provides a vehicle noise reduction system and an automobile, and aims to solve the problem that the whole automobile noise reduction capability of the automobile is poor.
A vehicle noise reduction system comprises a noise pickup device, a sound playing device and a vehicle-mounted controller, and further comprises a noise processing circuit and an active noise reduction module;
the noise picker is used for picking up first noise data;
the noise processing circuit is connected with the noise pickup device and is used for processing the first noise data to form a second noise signal;
the vehicle-mounted controller is used for receiving vehicle state data, determining the type of target noise and outputting the target noise;
the active noise reduction module is connected with the noise processing circuit and the vehicle-mounted controller and is used for processing the second noise signal according to the type of the target noise to form a third noise signal which is equal to the second noise signal in size and opposite in phase;
and the sound playing device is connected with the active noise reduction module and used for receiving the third noise signal output by the active noise reduction module and playing the third noise signal.
Further, the determining the type of the target noise and outputting by the vehicle state data includes:
and determining the value of a coefficient K according to the vehicle state data, and outputting the coefficient K, wherein the coefficient K is obtained by pre-calibration.
Further, the processing the second noise signal according to the type of the target noise to form a third noise signal having the same magnitude and the opposite phase as the second noise signal includes:
multiplying the amplitude of the second noise signal by K and then carrying out phase inversion processing to obtain a third noise signal; or,
and carrying out inversion processing on the second noise signal, and multiplying the amplitude of the second noise signal by K to obtain a third noise signal.
Further, the noise processing circuit comprises a filter circuit and an analog-to-digital conversion circuit;
the filter circuit is connected with the noise pickup device and used for filtering the first noise data and outputting a fourth noise signal;
the analog-to-digital conversion circuit is connected with the filter circuit and is used for performing analog-to-digital conversion on the fourth noise signal and outputting the second noise signal.
Further, the noise pickups include a left front pickup, a right front pickup, a left rear pickup, and a right rear pickup;
the left front picker is arranged on a left front vehicle door and used for picking up left front noise data;
the right front pickup is arranged on the right front car door and used for picking up right front noise data;
the left rear picker is arranged on the left rear vehicle door and used for picking up left rear noise data;
the right rear pickup is arranged on the right rear vehicle door and used for picking up right rear noise data;
the first noise data includes the front left noise data, the front right noise data, the rear left noise data, and the rear right noise data.
Further, the filter circuit is connected to the left front pickup, the right front pickup, the left rear pickup and the right rear pickup, and configured to perform filtering processing on the left front noise data, the right front noise data, the left rear noise data and the right rear noise data, and output a left front noise filtered signal, a right front noise filtered signal, a left rear noise filtered signal and a right rear noise filtered signal, respectively;
the analog-to-digital conversion circuit is configured to perform analog-to-digital conversion on the left front noise filtering signal, the right front noise filtering signal, the left rear noise filtering signal, and the right rear noise filtering signal, and output the second noise signal;
wherein the fourth noise signal comprises the front left noise filtered signal, the front right noise filtered signal, the rear left noise filtered signal, and the rear right noise filtered signal.
Further, the vehicle state data includes at least one of a current vehicle speed, window state data, and tailgate state data.
Further, the vehicle-mounted controller is connected with a vehicle speed sensor and used for acquiring the current vehicle speed;
the vehicle-mounted controller is connected with the vehicle window controller and is used for acquiring the vehicle window state data;
the vehicle-mounted controller is connected with the back door controller and is used for acquiring the back door state data;
the vehicle-mounted controller is used for outputting the type of the target noise according to at least one of the current vehicle speed, the vehicle window state data and the backdoor state data.
Further, the active noise reduction module comprises an active noise reduction circuit, a digital signal processor, an audio transceiver and a power amplifier;
the active noise reduction circuit is connected with the noise processing circuit and the vehicle-mounted controller and is used for processing the second noise signal according to the type of the target noise to form a first reversed-phase noise signal which is equal to the second noise signal in size and opposite in phase;
the digital signal processor is connected with the active noise reduction circuit and used for distributing the first inverted noise signal and outputting a second inverted noise signal;
the audio transceiver is connected with the digital signal processor and the power amplifier and is used for transmitting the second inverted noise signal to the power amplifier;
and the power amplifier is connected with the sound playing equipment and used for amplifying the second reversed phase noise signal and outputting the third noise signal to the sound playing equipment.
Further, the second anti-phase noise signal comprises a left front anti-phase noise signal, a right front anti-phase noise signal, a left rear anti-phase noise signal, and a right rear anti-phase noise signal;
the audio transceiver comprises a left front audio channel, a right front audio channel, a left rear audio channel and a right rear audio channel;
the left front audio channel is used for transmitting the left front inverted noise signal;
the right front audio channel is used for transmitting the right front anti-phase noise signal;
the left rear audio channel is used for transmitting the left rear inverted noise signal;
the right rear audio channel is used for transmitting the right rear inverted noise signal.
Further, the sound playing device comprises a left front speaker, a right front speaker, a left rear speaker and a right rear speaker;
the left front loudspeaker is arranged on a left front vehicle door and used for playing the left front inverted noise signal;
the right front loudspeaker is arranged on a right front vehicle door and used for playing the right front anti-phase noise signal;
the left rear loudspeaker is arranged on a left rear vehicle door and used for playing the left rear inverted noise signal;
the right rear loudspeaker is arranged on a right rear vehicle door and used for playing the right rear inverted noise signal and the third noise signal comprises the left front inverted noise signal, the right front inverted noise signal, the left rear inverted noise signal and the right rear inverted noise signal.
An automobile comprises the noise reduction system of the automobile.
According to the vehicle noise reduction system and the vehicle, the vehicle state data is received through the vehicle-mounted controller, and the type of the target noise is output, so that the active noise reduction module can generate the third noise signal which is equal to the second noise signal in size and opposite in phase according to the type of the target noise, the second noise signal output by the noise processing circuit is offset, the noise reduction is not limited to the noise reduction of the engine, the noise elimination generated under different vehicle state data can be realized, and the noise reduction capability of the vehicle is improved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention 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 these drawings without inventive labor.
FIG. 1 is a schematic electrical diagram of a vehicle noise reduction system in accordance with an embodiment of the present invention;
FIG. 2 is another schematic electrical diagram of a vehicle noise reduction system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control process for a noise reduction system of a vehicle according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a filter circuit according to an embodiment of the invention.
In the figure: 10. a noise processing circuit; 11. a filter circuit; 12. an analog-to-digital conversion circuit; 20. a vehicle-mounted controller; 30. an active noise reduction module; 31. an active noise reduction circuit; 32. a digital signal processor; 33. an audio transceiver; 34. a power amplifier; 40. a noise pickup; 50. a sound playing device.
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 some, not all, embodiments of the present invention. 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.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity to indicate like elements throughout.
It will be understood that when an element or layer is referred to as being "on" …, "adjacent to …," "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on …," "directly adjacent to …," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatial relationship terms such as "under …", "under …", "below", "under …", "above …", "above", and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" can encompass both an orientation of up and down. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
The present embodiment provides a vehicle noise reduction system, as shown in fig. 1, including a noise pickup 40, a sound playing device 50, a noise processing circuit 10, an on-board controller 20, and an active noise reduction module 30; a noise pickup 40 for picking up the first noise data; a noise processing circuit 10 connected to the noise pickup 40 for processing the first noise data to form a second noise signal; an on-board controller 20 for receiving the vehicle state data, determining the type of the target noise, and outputting; the active noise reduction module 30 is connected with the noise processing circuit 10 and the vehicle-mounted controller 20, and is used for processing the second noise signal according to the type of the target noise to form a third noise signal which is equal to the second noise signal in magnitude and opposite in phase; and the sound playing device 50 is connected with the active noise reduction module 30 and is used for playing the third noise signal.
In some embodiments, the determining the type of target noise from the vehicle state data and outputting includes: and determining the value of a coefficient K according to the vehicle state data, and outputting the coefficient K, wherein the coefficient K is obtained by pre-calibration. The processing the second noise signal according to the type of the target noise to form a third noise signal having the same magnitude and the opposite phase as the second noise signal includes: multiplying the amplitude of the second noise signal by K and then carrying out phase inversion processing to obtain a third noise signal; alternatively, the second noise signal is subjected to inversion processing, and the amplitude of the second noise signal is multiplied by K to obtain a third noise signal. Because the vibration characteristic of the vehicle changes under different vehicle states, such as a window opening state or a window closing state, the vehicle can respond differently under different states when facing inputs with the same frequency and the same amplitude, and the influence of the change of the vibration characteristic of the vehicle can be eliminated through the processing of the coefficient K, so that the active noise reduction effect is better.
The sound playing device 50 may be a speaker, and is configured to play a noise signal that is equal to the second noise signal in magnitude and opposite in phase, that is, a third noise signal, so as to cancel noise in the automobile, thereby achieving the purpose of reducing noise. Correspondingly, sound playback devices 50 can be respectively arranged on the left front door, the right front door, the left rear door and the right rear door, and the arrangement mode can be relatively uniformly arranged on the automobile, so that when sound playback devices 50 play third noise signals, a better automobile noise reduction effect can be achieved.
The first noise data is noise data picked up from the automobile and is unprocessed noise data.
The second noise signal is noise data obtained by processing the first noise data, for example, noise data obtained by performing filtering processing and analog-to-digital conversion processing on the first noise data, that is, noise data obtained by performing filtering processing and analog-to-digital conversion processing on real noise data picked up from an automobile.
The vehicle state data refers to state data corresponding to the current automobile. Illustratively, the vehicle state data may be, but is not limited to, any one of a current vehicle speed, window state data, and tailgate state data. The current vehicle speed refers to the current vehicle speed of the vehicle. The window state data refers to the current state of the automobile window. The automobile window comprises a door window and an automobile skylight. For example, the window state data may be any one of an open state, a closed state, and a stopped state of a door window, or may be any one of a fully open state, a closed state, a half open state, a ventilation state, and the like of a sunroof. The back door state data is a current state of the back door, and may be any one of an open state, a closed state, and a stopped state of the back door.
The type of the target noise refers to a type corresponding to the first noise data.
The third noise signal is a noise signal with the same magnitude and opposite phase as the second noise signal, that is, the third noise signal and the second noise signal are the same magnitude and opposite phase, so that the third noise signal and the second noise signal can be mutually superposed and offset, and the purpose of active noise reduction is achieved.
Specifically, the vehicle noise reduction system is a system applied to an automobile and used for reducing noise of the automobile. Alternatively, the vehicle noise reduction system can be applied to a multimedia system of an automobile. For example, the multimedia System may be a multimedia hardware platform developed based on a System On Chip (SOC). Optionally, the multimedia hardware platform includes a rotating display screen, an information media domain controller, a panoramic camera, a car recorder, a DMS (Driver monitor system, DMS for short), a USB assembly, and the like.
The vehicle noise reduction system includes a noise pickup 40, a sound playing device 50, a noise processing circuit 10, an on-board controller 20, and an active noise reduction module 30.
As an example, the noise pickup 40 may be a microphone for picking up the first noise data. In this example, the noise pickups 40 may be respectively disposed on the left front door, the right front door, the left rear door, and the right rear door of the automobile, so as to prevent errors caused by the arrangement of the noise orientation to pick up the first noise data when the first noise data is acquired, which is beneficial to acquiring the real and effective first noise data.
As an example, the noise processing circuit 10 is connected to the noise pickup 40, and is configured to receive the first noise data picked up by the noise pickup 40 and process the first noise data to form a second noise signal. Illustratively, after receiving the first noise data picked up by the noise pickup 40, the noise processing circuit 10 performs filtering and analog-to-digital conversion processing on the first noise data to obtain noise data which is convenient for processing. Specifically, the noise processing circuit 10 performs filtering processing on the first noise data to filter out clutter signals in the first noise data, so as to improve reliability of the first noise data; and then performing analog-to-digital conversion processing on the filtered first noise data, namely converting the first noise data into a digital signal, so that other circuits in the vehicle noise reduction system can process the first noise data, and the reliability of subsequent processing is guaranteed.
As an example, the on-board controller 20 is configured to receive vehicle state data, determine a type of target noise, and output the type of target noise to the active noise reduction circuit 30. Optionally, the vehicle status data may include at least one of a current vehicle speed, window status data, and tailgate status data. For example, if the vehicle state data includes only the current vehicle speed, the type of the corresponding target noise is engine noise.
If the vehicle state data only includes the window state data, the type of the corresponding target noise is window noise. If the vehicle state data only includes back door state data, the type of the corresponding target noise is back door noise. If the vehicle state data includes the current vehicle speed and the vehicle state data, the type of the corresponding target noise is a combination of engine noise and window noise. If the vehicle state data includes the current vehicle speed and the tailgate state data, the type of the corresponding target noise is a combination of engine noise and tailgate noise.
If the vehicle state data includes backdoor state data and vehicle state data, the type of the corresponding target noise is a combination of backdoor noise and window noise.
It should be noted that, because the noise generated by the vehicle is different in different vehicle state data, the on-board controller 20 may determine the type of the target noise according to the received vehicle state data and output the type of the target noise, that is, determine the type corresponding to the real and effective first noise data in different vehicle state data, so as to process the vehicle noise in different vehicle state data, and improve the noise reduction capability of the vehicle.
As an example, the active noise reduction module 30 is connected to the noise processing circuit 10 and the vehicle-mounted controller 20, and is configured to process the second noise signal according to the type of the target noise, and form a third noise signal having the same magnitude and opposite phase to the second noise signal. It should be noted that, because the noise generated by the vehicle under different vehicle state data is different, that is, the second noise signal may be at least one of engine noise, tailgate noise and window noise, the active noise reduction module 30 may generate a third noise signal having the same magnitude and opposite phase to the second noise signal according to the type of the target noise, so as to cancel the second noise signal, thereby implementing noise cancellation generated under different vehicle state data, and improving the noise reduction capability of the vehicle.
Optionally, a watchdog signal line and a reset signal line are disposed between the active noise reduction module 30 and the vehicle-mounted controller 20, and are used for controlling and supervising the active noise reduction module 30, so as to improve the reliability of the vehicle noise reduction system. As an example, the onboard controller 20 sends a detection signal to the active noise reduction module 30 through a watchdog signal line according to a preset signal period, if the onboard controller 20 receives a response signal sent by the active noise reduction module 30, the active noise reduction module 30 operates normally, and if the onboard controller 20 does not receive the response signal sent by the active noise reduction module 30, the active noise reduction module 30 operates abnormally, thereby supervising the active noise reduction module 30. As another example, if the on-board controller 20 detects that the active noise reduction module 30 is abnormally operated, the reset signal may be sent to the active noise reduction module 30 through the reset signal line, so as to safely restart the active noise reduction module 30, thereby improving the safety of the vehicle noise reduction system.
In the embodiment, the vehicle-mounted controller 20 receives the vehicle state data and outputs the type of the target noise, so that the active noise reduction module 30 can generate a third noise signal with the same magnitude and opposite phase as the second noise signal according to the type of the target noise to offset the second noise signal output by the noise processing circuit 10, thereby reducing the engine noise, eliminating the noise generated under different vehicle state data, and improving the noise reduction capability of the vehicle.
In one embodiment, as shown in fig. 2, the noise processing circuit 10 includes a filter circuit 11 and an analog-to-digital conversion circuit 12; the filter circuit 11 is connected with the noise pickup 40 and is used for filtering the first noise data and outputting a fourth noise signal; and the analog-to-digital conversion circuit 12 is connected to the filter circuit 11, and is configured to perform analog-to-digital conversion on the fourth noise signal and output a second noise signal.
The filter circuit 11 is a circuit for filtering the first noise data. The fourth noise signal is a noise signal obtained by filtering the first noise data.
As an example, the filter circuit 11 is connected to the noise pickup 40, receives the first noise data picked up by the noise pickup 40, and performs a filtering process on the first noise data to filter out a clutter signal in the first noise data, so as to improve reliability of the first noise data.
Optionally, the filter circuit 11 comprises a low-pass filter. And a noise pickup device 40 is respectively arranged on the left front door, the right front door, the left rear door and the right rear door, and 4 paths of first noise data are obtained. Preferably, the low pass filter comprises two dual channel amplifiers. Preferably, the cutoff frequency of the filter circuit 11 is 250Hz to bring the filter circuit 11 close to the ideal state. For example, by adopting a low-pass filter with a cutoff frequency of 250Hz and two dual-channel amplifiers, the filtering processing can be performed on the 4 paths of first noise data, so as to achieve the purpose of filtering out clutter signals in the first noise data, and have a better filtering effect.
As an example, as shown in fig. 4, the filter circuit 11 includes a first low-pass filter and a second low-pass filter. The first low-pass filter comprises a first capacitor C1, a first resistor R1, a second resistor R2 and a third resistor R3. The second low pass filter includes a second capacitor C6, a fourth resistor R5, a fifth resistor R6, and a sixth resistor R7. In this example, in order to achieve a better filtering effect by the filter circuit 11, the first low-pass filter gain a is 4, the cutoff frequency f0 is 250Hz, and the quality factor Q is 0.578. ThenTake C1-33 nF, C2-4Q2(A+1)C1≈220nF，
R2＝AR1≈12KΩ，
It should be noted that the values of the second capacitor C6, the fourth resistor R5, the fifth resistor R6, and the sixth resistor R7 in the second low-pass filter are similar to the values in the first low-pass filter, and are not described herein again.
As an example, the analog-to-digital conversion circuit 12 is connected to the filter circuit 11, and is configured to receive the fourth noise signal output by the filter circuit 11, perform analog-to-digital conversion on the fourth noise signal, and output a second noise signal. Note that the second noise signal is a serial digital signal. Illustratively, the analog-to-digital conversion circuit 12 receives the 4 filtered fourth noise signals output by the filter circuit 11, that is, the fourth noise signal filtered by the first noise data picked up on the front left door, the fourth noise signal filtered by the first noise data picked up on the front right door, the fourth noise signal filtered by the first noise data picked up on the rear left door, and the fourth noise signal filtered by the first noise data picked up on the rear right door, and the analog-to-digital conversion circuit 12 performs analog-to-digital conversion on the 4 fourth noise signals and outputs 1 serial digital signal, that is, the second noise signal, so that other circuits in the vehicle noise reduction system can process the first noise data.
In the present embodiment, the vehicle noise reduction system performs filter processing on the first noise data by the noise processing circuit 10 to filter out clutter signals in the first noise data to improve the reliability of the first noise data, and performs analog-to-digital conversion processing on the filter-processed first noise data by using the analog-to-digital conversion circuit 12, that is, converts the first noise data into a serial digital signal, so that other circuits in the vehicle noise reduction system process the first noise data.
In one embodiment, the noise pickups 40 include a left front pickup, a right front pickup, a left rear pickup, and a right rear pickup; the left front pickup is arranged on the left front vehicle door and used for picking up left front noise data; the right front pickup is arranged on the right front vehicle door and used for picking up right front noise data; the left rear picker is arranged on the left rear vehicle door and used for picking up left rear noise data; and the right rear pickup is arranged on the right rear vehicle door and used for picking up right rear noise data.
Wherein, the left front pickup is a noise pickup device arranged on the left front vehicle door. The right front pickup means a noise pickup device provided on the right front door. The left rear pickup means a noise pickup device provided on the left rear door. The right rear pickup means a noise pickup device provided on the right rear door. The left front noise data refers to the first noise data picked up by the left front pickup. The right front noise data refers to first noise data picked up by the right front pickup. The left rear noise data refers to the first noise data picked up by the left rear pickup. The right rear noise data refers to first noise data picked up by the right rear pickup.
In the present embodiment, the noise pickup 40 includes a left front pickup, a right front pickup, a left rear pickup, and a right rear pickup, and by disposing the left front pickup, the right front pickup, the left rear pickup, and the right rear pickup on the left front door, the right front door, the left rear door, and the right rear door, respectively, in order to prevent the setting of the noise azimuth from causing an error in the pickup of the first noise data when the first noise data is acquired, it is advantageous to acquire truly effective first noise data.
In one embodiment, the filter circuit 11 is connected to the left front pickup, the right front pickup, the left rear pickup and the right rear pickup, and is configured to perform filtering processing on the left front noise data, the right front noise data, the left rear noise data and the right rear noise data, and output a left front noise filtered signal, a right front noise filtered signal, a left rear noise filtered signal and a right rear noise filtered signal; the analog-to-digital conversion circuit 12 is configured to perform analog-to-digital conversion on the left front noise filtering signal, the right front noise filtering signal, the left rear noise filtering signal, and the right rear noise filtering signal, and output a second noise signal.
Wherein the fourth noise signal includes a left front noise filtered signal, a right front noise filtered signal, a left rear noise filtered signal, and a right rear noise filtered signal. The left front noise filter signal is a noise signal obtained by filtering the left front noise data by the filter circuit 11. The right front noise filter signal is a noise signal obtained by filtering right front noise data by the filter circuit 11. The left rear noise filter signal is a noise signal obtained by filtering the left rear noise data by the filter circuit 11. The right rear noise filtered signal is a noise signal obtained by filtering right rear noise data by the filter circuit 11.
In the present embodiment, the filter circuit 11 is connected to the left front pickup, the right front pickup, the left rear pickup, and the right rear pickup, so that the filter processing of the left front noise data, the right front noise data, the left rear noise data, and the right rear noise data can be realized to output 4 fourth noise signals, and the analog-to-digital conversion circuit 12 is connected to the filter circuit 11, so that the analog-to-digital conversion of the 4 fourth noise signals can be realized by the analog-to-digital conversion circuit 12 to output 1 serial digital signal, that is, the second noise signal.
In one embodiment, the vehicle status data includes at least one of current vehicle speed, window status data, and tailgate status data.
As an example, the vehicle state data acquired by the on-board controller 20 includes at least one of a current vehicle speed, window state data, and tailgate state data. Alternatively, the vehicle-mounted controller 20 may receive a control message and a feedback message for controlling the vehicle by the user through a multimedia hardware platform, for example, a rotating display screen in the multimedia hardware platform, and query the type of the target noise corresponding to the control message and the feedback message from a preset vehicle state information table according to the control message and the feedback message.
In this example, the vehicle status information table includes types of control items, control messages, feedback messages, and target noise. As an example, the car state information table includes a door window state information table (shown in table one), a sunroof state information table (shown in table two), and a tailgate state information table (shown in table three).
Meter-vehicle door and window state information meter
As shown in the above table one, a CAN (Controller Area Network, CAN for short) message refers to a message transmitted in a CAN protocol form. The status information refers to information transmitted in a UART (Universal Asynchronous Receiver/Transmitter, UART for short) bus format. For example, as shown in fig. 3, when a user controls the left front door window to be opened, at this time, the second noise signal in the automobile is a noise signal corresponding to the state that the left front door window is opened, the control message received by the onboard controller 20 is a CAN message 1, the feedback message is a CAN message a, and the state information a is queried from the door window state information table according to the CAN message 1 and the CAN message a, so that the active noise reduction module 30 CAN generate a third noise signal which is equal in magnitude and opposite in phase to the second noise signal in the automobile when the left front door window is opened according to the state information a, thereby implementing noise reduction processing on the second noise signal of different vehicle state data and improving the noise reduction capability of the automobile. It should be noted that, referring to the first table above, a process of generating a target anti-phase noise signal when the vehicle door window is in other states is similar to a process of generating a target anti-phase noise signal when the front left vehicle door window is opened in this example, and is not described herein again.
Meter two automobile skylight state information meter
| Control item | Control message | Feedback message | Type of target noise |
| Skylight with window | CAN message 13 | CAN message M | Status information m |
| Skylight for closing | CAN message 14 | CAN message N | Status information n |
| Skylight half | CAN message 15 | CAN message O | Status information o |
| Stop | CAN message 16 | CAN message P | Last state information m or n before stop or |
| Ventilation | CAN message 17 | CAN message Q | Status information q |
As shown in the second table, as shown in fig. 3, when the user controls the opening of the sunroof, the second noise signal in the car is the noise signal corresponding to the state that the sunroof is opened, the CAN message 13 received by the onboard controller 20, and the feedback message is the CAN message M, and the state information M is queried from the sunroof state information table according to the CAN message 13 and the CAN message M, so that the active noise reduction module 30 CAN generate the third noise signal having the same magnitude and the opposite phase as the second noise signal in the car when the sunroof is opened according to the state information M, thereby implementing the noise reduction processing on the second noise signal of different car state data and improving the noise reduction capability of the car. It should be noted that, referring to the second table above, the process of generating the target inverse noise signal when the sunroof is in other states is similar to the process of generating the target inverse noise signal when the sunroof is opened in this example, and is not described herein again.
Meter-three electric back door state information meter
| Control item | Control message | Feedback message | Type of target noise |
| Opening the back | CAN message 18 | CAN message R | Status information r |
| Stop opening | CAN message 19 | CAN message S | Status information t |
| Closing back | CAN |
CAN message T | Status information t |
As shown in the third table, as shown in fig. 3, as another example, when the user controls the back door to open, the second noise signal in the automobile is a noise signal corresponding to the state that the back door is open, the control message received by the onboard controller 20 is the CAN message 18, the feedback message is the CAN message R, and the state information R is queried from the back door state information table according to the CAN message 18 and the CAN message R, so that the active noise reduction module 30 CAN generate a third noise signal having the same magnitude and the opposite phase as the second noise signal in the automobile when the back door is open according to the state information R, thereby implementing noise reduction processing on the second noise signal of different vehicle state data and improving the noise reduction capability of the automobile. It should be noted that, referring to table three above, the process of generating the target inverse noise signal when the back door of the automobile is in other states is similar to the process of generating the target inverse noise signal when the back door of the automobile is opened in this example, and is not described again here.
It should be noted that, because the actual operating state of the vehicle is much more complex than the ideal operating state, the operating state of the vehicle is not fixed and unchanged, and it is obvious that the requirement under the actual condition cannot be met only by obtaining the current vehicle speed to form the third noise signal to reduce the noise of the vehicle, therefore, the third noise signal needs to be formed by combining the vehicle state data to reduce the noise of the vehicle, so as to improve the noise reduction capability of the vehicle. For example, if the on-board controller 20 simultaneously queries at least two of the state information a, the state information m, and the state information r, the active noise reduction module 30 may calculate a third noise signal according with the corresponding vehicle state data by an internal algorithm and by combining with the actual situation of the current vehicle speed, so as to further improve the noise reduction capability of the vehicle.
In one embodiment, the vehicle-mounted controller 20 is connected to a vehicle speed sensor for acquiring a current vehicle speed; the vehicle-mounted controller 20 is connected with the vehicle window controller and is used for acquiring vehicle window state data; the vehicle-mounted controller 20 is connected with the back door controller and is used for collecting back door state data; and an on-board controller 20 for outputting a type of the target noise based on at least one of a current vehicle speed, window state data, and tailgate state data.
The vehicle speed sensor is a sensor used for collecting the current vehicle speed. The window controller is a controller for collecting window state data. The back door controller is a controller used for collecting back door state data.
In the present embodiment, the type of the target noise can be output based on at least one of the current vehicle speed, the window state data, and the tailgate state data by connecting the on-board controller 20 to the vehicle speed sensor, the window controller, and the tailgate controller.
In one embodiment, as shown in FIG. 2, active noise reduction module 30 includes active noise reduction circuit 31, digital signal processor 32, audio transceiver 33, and power amplifier 34; the active noise reduction circuit 31 is connected with the noise processing circuit 10 and the vehicle-mounted controller 20 and is used for processing the second noise signal according to the type of the target noise to form a first inverted noise signal which is equal to the second noise signal in size and opposite in phase; the digital signal processor 32 is connected with the active noise reduction circuit 31 and is used for distributing the first inverted noise signal and outputting a second inverted noise signal; an audio transceiver 33 connected to the digital signal processor 32 and the power amplifier 34 for transmitting the second inverted noise signal to the power amplifier 34; and the power amplifier 34 is connected with the sound playing device 50 and is used for amplifying the second inverted noise signal and outputting a third noise signal to the sound playing device 50.
The first inverted noise signal is a noise signal which is not distributed and has the same size and opposite phase with the second noise signal. The second inverted noise signal is a noise signal that is equal in magnitude and opposite in phase to the second noise signal after the distribution processing. The third noise signal is a noise signal which is amplified by power and has the same size and opposite phase with the second noise signal.
As an example, the active noise reduction circuit 31 is connected to the noise processing circuit 10 and the vehicle-mounted controller 20, and configured to process the second noise signal according to the type of the target noise to form a first inverse noise signal having the same magnitude and opposite phase as the second noise signal, and analyze the second noise signal according to the type of the target noise to form a first inverse noise signal having the same magnitude and opposite phase as the second noise signal.
As another example, the digital signal processor 32 is connected to the active noise reduction circuit 31, and is configured to distribute the first inverse noise signal and output the second inverse noise signal. Alternatively, the digital signal processor 32, for example, divides the first inverted noise signal into a left front inverted noise signal, a right front inverted noise signal, a left rear inverted noise signal, and a right rear inverted noise signal, and outputs to the audio transceiver 33. Alternatively, it may be output to the audio transceiver 33 through a time division multiplexing interface.
As another example, an audio transceiver 33 is connected to the digital signal processor 32 and the power amplifier 34 for transmitting the second inverted noise signal to the power amplifier 34. For example, the front left noise signal, the front right noise signal, the rear left noise signal, and the rear right noise signal are transmitted to the power amplifier 34 for encoding, decoding, conversion, amplification, and other processes. Alternatively, the audio transceiver 33 may be A2B (car audio bus).
As an example, the power amplifier 34 is connected to the sound playing apparatus 50, and is configured to amplify the second inverted noise signal and output a third noise signal to the sound playing apparatus 50. For example, the left front inverse noise signal, the right front inverse noise signal, the left rear inverse noise signal and the right rear inverse noise signal are respectively output to the left front loudspeaker, the right front loudspeaker, the left rear loudspeaker and the right rear loudspeaker, so that the left front loudspeaker, the right front loudspeaker, the left rear loudspeaker and the right rear loudspeaker play the left front inverse noise signal, the right front inverse noise signal, the left rear inverse noise signal and the right rear inverse noise signal, thereby cancelling the second noise signal and achieving the purpose of reducing the noise of the automobile.
In one embodiment, the audio transceiver 33 includes a front left audio channel, a front right audio channel, a back left audio channel, and a back right audio channel; a left front audio channel for transmitting a left front anti-phase noise signal; a right front audio channel for transmitting a right front anti-phase noise signal; a left rear audio channel for transmitting a left rear anti-phase noise signal; and a right rear audio channel for transmitting a right rear anti-phase noise signal.
As an example, an A2B (car audio bus) transceiver includes 8 channels (slots), the 8 channels including a front left audio channel for transmitting a front left anti-phase noise signal, a front right audio channel for transmitting a front right anti-phase noise signal, a rear left audio channel for transmitting a rear left anti-phase noise signal, and a rear right audio channel for transmitting a rear right anti-phase noise signal.
In the present embodiment, the audio transceiver 33 includes a front left audio channel for transmitting a front left anti-phase noise signal, a front right audio channel for transmitting a front right anti-phase noise signal, a rear left audio channel for transmitting a rear left anti-phase noise signal, and a rear right audio channel for transmitting a rear right anti-phase noise signal, so as to ensure normal transmission of the front left anti-phase noise signal, the front right anti-phase noise signal, the rear left anti-phase noise signal, and the rear right anti-phase noise signal.
In one embodiment, the sound playing device 50 includes a left front speaker, a right front speaker, a left rear speaker, and a right rear speaker; the third noise signal comprises a left front inverse noise signal, a right front inverse noise signal, a left rear inverse noise signal and a right rear inverse noise signal; the left front loudspeaker is arranged on the left front vehicle door and used for playing a left front inverted noise signal; the right front loudspeaker is arranged on the right front vehicle door and used for playing a right front anti-phase noise signal; the left rear loudspeaker is arranged on the left rear vehicle door and used for playing a left rear inverted noise signal; and the right rear loudspeaker is arranged on the right rear vehicle door and used for playing the right rear reversed phase noise signal.
The left front speaker is a speaker arranged on a left front door. The right front speaker is a speaker provided on the right front door. The left rear speaker is a speaker provided on the left rear door. The right rear speaker is a speaker provided on the right rear door. The front left anti-phase noise signal refers to the third noise signal played on the front left speaker. The right front anti-phase noise signal refers to a third noise signal played on the right front speaker. The rear left anti-phase noise signal refers to the third noise signal played on the rear left speaker. The right rear anti-phase noise signal refers to a third noise signal played on the right rear speaker.
In this embodiment, by respectively setting the left front speaker, the right front speaker, the left rear speaker and the right rear speaker on the left front door, the right front door, the left rear door and the right rear door, this setting mode can be relatively uniformly set on the automobile, and when the sound playing device 50 plays the third noise signal to reduce the noise of the second noise signal, a better automobile noise reduction effect can be achieved.
The embodiment provides an automobile comprising the noise reduction system of the automobile in the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (12)
1. A vehicle noise reduction system comprises a noise pickup device, a sound playing device and a vehicle-mounted controller, and is characterized by further comprising a noise processing circuit and an active noise reduction module;
the noise picker is used for picking up first noise data;
the noise processing circuit is connected with the noise pickup device and is used for processing the first noise data to form a second noise signal;
the vehicle-mounted controller is used for receiving vehicle state data, determining the type of the target noise according to the vehicle state data and outputting the target noise;
the active noise reduction module is connected with the noise processing circuit and the vehicle-mounted controller and is used for processing the second noise signal according to the type of the target noise to form a third noise signal which is equal to the second noise signal in size and opposite in phase;
and the sound playing device is used for receiving the third noise signal output by the active noise reduction module and playing the third noise signal.
2. The vehicle noise reduction system of claim 1, wherein the determining and outputting the type of target noise from the vehicle state data comprises:
and determining the value of a coefficient K according to the vehicle state data, and outputting the coefficient K, wherein the coefficient K is obtained by pre-calibration.
3. The vehicle noise reduction system of claim 2, wherein the processing the second noise signal to form a third noise signal equal in magnitude and opposite in phase to the second noise signal based on the type of the target noise comprises:
multiplying the amplitude of the second noise signal by K and then carrying out phase inversion processing to obtain a third noise signal; or,
and carrying out inversion processing on the second noise signal, and multiplying the amplitude of the second noise signal by K to obtain a third noise signal.
4. The vehicle noise reduction system of claim 1, wherein the noise processing circuit includes a filter circuit and an analog-to-digital conversion circuit;
the filter circuit is connected with the noise pickup device and used for filtering the first noise data and outputting a fourth noise signal;
the analog-to-digital conversion circuit is connected with the filter circuit and is used for performing analog-to-digital conversion on the fourth noise signal and outputting the second noise signal.
5. The vehicle noise reduction system of claim 4, wherein the noise pickups include a front left pickups, a front right pickups, a rear left pickups, and a rear right pickups;
the left front picker is arranged on a left front vehicle door and used for picking up left front noise data;
the right front pickup is arranged on the right front car door and used for picking up right front noise data;
the left rear picker is arranged on the left rear vehicle door and used for picking up left rear noise data;
the right rear pickup is arranged on the right rear vehicle door and used for picking up right rear noise data;
the first noise data includes the front left noise data, the front right noise data, the rear left noise data, and the rear right noise data.
6. The vehicle noise reduction system according to claim 5, wherein the filter circuit is connected to a front left pickup, a front right pickup, a rear left pickup, and a rear right pickup, and is configured to filter the front left noise data, the front right noise data, the rear left noise data, and the rear right noise data to output a front left noise filtered signal, a front right noise filtered signal, a rear left noise filtered signal, and a rear right noise filtered signal, respectively;
the analog-to-digital conversion circuit is configured to perform analog-to-digital conversion on the left front noise filtering signal, the right front noise filtering signal, the left rear noise filtering signal, and the right rear noise filtering signal, and output the second noise signal;
wherein the fourth noise signal comprises the front left noise filtered signal, the front right noise filtered signal, the rear left noise filtered signal, and the rear right noise filtered signal.
7. The vehicle noise reduction system of claim 1, wherein the vehicle state data includes at least one of current vehicle speed, window state data, and tailgate state data.
8. The vehicle noise reduction system of claim 7, wherein the on-board controller is coupled to a vehicle speed sensor for collecting the current vehicle speed;
the vehicle-mounted controller is connected with the vehicle window controller and is used for acquiring the vehicle window state data;
the vehicle-mounted controller is connected with the back door controller and is used for acquiring the back door state data;
and the vehicle-mounted controller is used for determining the type of the target noise according to at least one of the current vehicle speed, the vehicle window state data and the backdoor state data and outputting the type of the target noise.
9. The vehicle noise reduction system of claim 1, wherein the active noise reduction module includes an active noise reduction circuit, a digital signal processor, an audio transceiver, and a power amplifier;
the active noise reduction circuit is connected with the noise processing circuit and the vehicle-mounted controller and is used for processing the second noise signal according to the type of the target noise to form a first reversed-phase noise signal which is equal to the second noise signal in size and opposite in phase;
the digital signal processor is connected with the active noise reduction circuit and used for distributing the first inverted noise signal and outputting a second inverted noise signal;
the audio transceiver is connected with the digital signal processor and the power amplifier and is used for transmitting the second inverted noise signal to the power amplifier;
and the power amplifier is connected with the sound playing equipment and used for amplifying the second reversed phase noise signal and outputting the third noise signal to the sound playing equipment.
10. The vehicle noise reduction system of claim 9, wherein the second anti-phase noise signal includes a front left anti-phase noise signal, a front right anti-phase noise signal, a rear left anti-phase noise signal, and a rear right anti-phase noise signal;
the audio transceiver comprises a left front audio channel, a right front audio channel, a left rear audio channel and a right rear audio channel;
the left front audio channel is used for transmitting the left front inverted noise signal;
the right front audio channel is used for transmitting the right front anti-phase noise signal;
the left rear audio channel is used for transmitting the left rear inverted noise signal;
the right rear audio channel is used for transmitting the right rear inverted noise signal.
11. The vehicle noise reduction system of claim 10, wherein the sound playing device includes a front left speaker, a front right speaker, a rear left speaker, and a rear right speaker;
the left front loudspeaker is arranged on a left front vehicle door and used for playing the left front inverted noise signal;
the right front loudspeaker is arranged on a right front vehicle door and used for playing the right front anti-phase noise signal;
the left rear loudspeaker is arranged on a left rear vehicle door and used for playing the left rear inverted noise signal;
the right rear loudspeaker is arranged on a right rear vehicle door and used for playing the right rear inverted noise signal;
the third noise signal includes the front left inverse noise signal, the front right inverse noise signal, the back left inverse noise signal, and the back right inverse noise signal.
12. An automobile, characterized in that it comprises a vehicle noise reduction system according to any one of claims 1 to 11.
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