CN211296936U - Noise reduction system applied to vehicle - Google Patents
Noise reduction system applied to vehicle Download PDFInfo
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- CN211296936U CN211296936U CN201922232830.8U CN201922232830U CN211296936U CN 211296936 U CN211296936 U CN 211296936U CN 201922232830 U CN201922232830 U CN 201922232830U CN 211296936 U CN211296936 U CN 211296936U
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Abstract
The utility model relates to a noise reduction system applied to a vehicle, which comprises a first microphone, a second microphone, a noise reduction chip, a loudspeaker, a digital-to-analog conversion circuit and a vehicle-mounted multimedia host, wherein the first microphone collects a first sound signal of a first frequency range including a voice sound wave of personnel in the vehicle and a part of the noise sound wave, the second microphone collects a second sound signal of a second frequency range including a noise sound wave in the vehicle and sends the second sound signal to the noise reduction chip, the noise reduction chip is connected with the digital-to-analog conversion circuit, receives the first sound signal and the second sound signal, generates a digital noise reduction signal and sends the digital-to-analog conversion circuit, and the noise reduction signal is a reverse wave of a third sound signal obtained by removing the frequency overlapping part of the first sound signal and the second sound signal from the second sound signal; the noise reduction signal is a backward wave of the frequency overlapping part of the first sound signal and the second sound signal, so that the problem that part of the sound signal transmitted to the human ear by the eardrum is reduced or even completely eliminated can be solved, and the noise reduction accuracy is improved.
Description
Technical Field
The application relates to the technical field of noise reduction processing, in particular to a noise reduction system applied to a vehicle.
Background
Noise reduction, as the name implies, is the reduction of noise and thus the reduction of the impact of noise on humans. In the running process of the vehicle, noise generated by rotation of a chassis engine and noise generated by friction between tires and the ground exist in a carriage. Generally, a noise reduction chip in a vehicle receives the noise through a microphone and generates a noise reverse wave, a speaker device in the vehicle plays the noise reverse wave generated by the noise reduction chip, when the noise and the noise reverse wave are simultaneously transmitted to human ears, the noise reverse wave can neutralize the noise, and the noise felt by the human ears can be effectively reduced or even completely eliminated.
However, it is worth noting that the noise reduction chip in the vehicle receives sound signals through the microphone, and besides noise generated by rotation of a chassis engine and noise sound waves generated by friction between tires and the ground, human voice sound waves also exist; therefore, the following problems exist in the prior art: the microphone in the vehicle actually collects sound signals including noise sound waves in the vehicle and voice sound waves of a part of people, therefore, backward waves generated by the noise reduction chip according to the sound signals collected by the microphone include noise backward waves and voice backward waves, and the loudspeaker plays and plays the noise backward waves and the voice backward waves generated by the noise reduction chip, therefore, when the noise backward waves and the voice backward waves are simultaneously transmitted to the ears of people, not only the noise is reduced or eliminated, but also the voice sound waves of the part of people are reduced or even completely eliminated.
SUMMERY OF THE UTILITY MODEL
The technical problem that the backward wave that the chip of making an uproar generated according to the sound signal that the microphone was collected is fallen to the chip that should solve includes noise backward wave and pronunciation backward wave, and the noise backward wave and the pronunciation backward wave that the chip of making an uproar generated are fallen in the broadcast of speaker, and when noise backward wave and pronunciation backward wave were introduced into the human ear simultaneously, not only the noise was reduced or was eliminated, and some people's pronunciation sound wave was also reduced or even was eliminated completely is solved.
In order to solve the technical problem, the embodiment of the application discloses a noise reduction system applied to a vehicle, and the system comprises a first microphone, a second microphone, a noise reduction chip, a loudspeaker, a digital-to-analog conversion circuit and a vehicle-mounted multimedia host;
the first microphone is respectively connected with the noise reduction chip and the vehicle-mounted multimedia host, collects a first sound signal in a first frequency range including voice sound waves of personnel in the vehicle and partial noise sound waves, and sends the first sound signal to the noise reduction chip and the vehicle-mounted multimedia host;
the second microphone is connected with the noise reduction chip, collects a second sound signal in a second frequency range including noise sound waves in the vehicle and sends the second sound signal to the noise reduction chip;
the noise reduction chip is connected with the digital-to-analog conversion circuit, receives the first sound signal and the second sound signal, generates a digital noise reduction signal and sends the digital noise reduction signal to the digital-to-analog conversion circuit, and the noise reduction signal is a third sound signal after removing the sound signal of the overlapping part of the first sound signal and the second sound signal;
the digital-to-analog conversion circuit is connected with the loudspeaker and is used for converting the received digital noise reduction signal into an analog noise reduction signal and sending the analog noise reduction signal to the loudspeaker;
receiving and playing the analog noise reduction signal by a loudspeaker;
the vehicle-mounted multimedia system host receives the first sound signal and performs voice recognition processing.
Optionally, the number of the first microphones is at least one; the noise reduction chip is connected with the first microphone through an automobile audio bus.
Optionally, the second microphone is connected to the noise reduction chip through an automobile audio bus. The number of the second microphones is at least one; the noise reduction chip is connected with the second microphone through an automobile audio bus.
Optionally, the first microphone is a directional microphone.
Optionally, the second microphone is an omnidirectional microphone.
Optionally, the number of the first microphones is two; a first microphone is arranged on the roof of a main driver seat corresponding to the windshield of the vehicle; the other first microphone is used for being arranged on the roof of a passenger seat in the vehicle, which is close to the windshield of the vehicle.
Optionally, the number of the second microphones is four; the first second microphone is arranged on the inner side of the front left door of the vehicle and close to the chassis of the vehicle; the second microphone is arranged on the inner side of the front right door of the vehicle and close to the chassis of the vehicle; the third second microphone is arranged on the inner side of the rear left door of the vehicle and close to the chassis of the vehicle; the fourth second microphone is disposed on the inner side of the rear right door of the vehicle at a position close to the vehicle chassis.
By adopting the technical scheme, the embodiment of the application has the following beneficial effects:
the first microphone collects a first sound signal of a first frequency range including voice sound waves of people in the vehicle and partial noise sound waves, the second microphone collects a second sound signal of a second frequency range including noise sound waves in the vehicle and sends the second sound signal to the noise reduction chip, the noise reduction chip is connected with the digital-to-analog conversion circuit, the first sound signal and the second sound signal are received, a digital noise reduction signal is generated and sent to the digital-to-analog conversion circuit, and the noise reduction signal is a reverse wave of the first sound signal and the second sound signal, wherein the frequency of the first sound signal is overlapped with that of the second sound signal, so that the problem that partial sound signals transmitted to human ears by the eardrum are reduced or even completely eliminated can be solved, and the noise reduction accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a noise reduction system provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a noise reduction system provided in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a noise reduction system provided in an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a noise reduction system provided in an embodiment of the present application;
the following is a supplementary description of the drawings:
1-a first microphone; 2-a second microphone; 3-a noise reduction chip; 4-a digital-to-analog conversion circuit; 5-a loudspeaker; 6-vehicle multimedia host; 7-car audio bus.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the present application. In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a noise reduction system according to an embodiment of the present disclosure. The embodiment of the application discloses a noise reduction system applied to a vehicle, which comprises a first microphone 1, a second microphone 2, a noise reduction chip 3, a loudspeaker 5, a digital-to-analog conversion circuit 4 and a vehicle-mounted multimedia host 6;
the first microphone 1 is respectively connected with the noise reduction chip 3 and the vehicle-mounted multimedia host 6, and the first microphone 1 collects a first sound signal in a first frequency range including voice sound waves and partial noise sound waves of personnel in the vehicle and sends the first sound signal to the noise reduction chip 3 and the vehicle-mounted multimedia host 6;
the second microphone 2 is connected with the noise reduction chip 3, and the second microphone 2 collects a second sound signal in a second frequency range including noise sound waves in the vehicle and sends the second sound signal to the noise reduction chip 3;
the noise reduction chip 3 is connected with the digital-to-analog conversion circuit 4, receives the first sound signal and the second sound signal, generates a digital noise reduction signal and sends the digital noise reduction signal to the digital-to-analog conversion circuit 4, wherein the noise reduction signal is a backward wave of a third sound signal obtained by removing the frequency overlapping part of the first sound signal and the second sound signal from the second sound signal;
the digital-to-analog conversion circuit 4 is connected with the loudspeaker 5 and is used for converting the received digital noise reduction signal into an analog noise reduction signal and sending the analog noise reduction signal to the loudspeaker 5;
the loudspeaker 5 receives and broadcasts the analog noise reduction signal;
the vehicle-mounted multimedia host receives the first sound signal and performs voice recognition processing.
In the present embodiment, the frequency range of the sound wave signals that can be collected by the first microphone 1 and the second microphone 2 is determined by its own hardware.
In an optional embodiment, the first microphone 1 collects a first sound signal, the first sound signal that can be collected mainly includes a voice sound wave and a partial noise sound wave of a person in a vehicle, and a first frequency range of the first sound signal is 200-700 HZ; the second microphone 2 collects a second sound signal, which is mainly the noise generated by the rotation of the chassis engine in the carriage and the noise generated by the friction between the tire and the ground, and the second frequency range of the second sound signal is 20-300Hz, so the frequency overlapping part of the first frequency range 200-700Hz and the second frequency range 20-300Hz is 200-300 Hz. In the embodiment, by arranging the first microphone 1 and the second microphone 2, and by the signal connection relationship between the first microphone 1 and the noise reduction chip 3, the first microphone 1 can send the first sound signal to the noise reduction chip 3, the second microphone 2 can send the second sound signal to the noise reduction chip 3, and if the noise reduction chip 3 detects the sound signal of 200 + 300HZ existing in the second sound signal, the noise reduction chip 3 can filter the signal of 200 + 300HZ from the second sound signal of 20-300HZ based on the prior art to obtain the third sound signal of 20-200HZ, that is, the noise reduction signal is the inverse wave of the third sound signal of 20-200 HZ.
In an optional embodiment, the noise reduction signal generated by the noise reduction chip 3 is a digital noise reduction signal, the noise reduction chip 3 sends the digital noise reduction signal to the digital-to-analog conversion circuit 4, the digital-to-analog conversion circuit 4 receives the digital noise reduction signal and converts the digital noise reduction signal into an analog noise reduction signal, and the analog noise reduction signal can be played through a speaker 5 connected to the digital-to-analog conversion circuit 4. Therefore, a first sound signal, a second sound signal and a noise reduction signal exist in the vehicle, when the noise reduction signal, namely, the backward wave of the third sound signal and the second sound signal are transmitted into the ear by the eardrum, superposition is generated, so that the signals related to the noise frequency in the second sound signal are reduced or eliminated, and the signals related to the personnel voice frequency in the first sound signal and the second sound signal are reserved, so that the problem that in the prior art, when only the noise signal is collected through a microphone and noise is reduced through the noise reduction chip 3, part of the sound signals are reduced or even completely eliminated is solved, and the noise reduction accuracy is improved.
In an alternative embodiment, the frequencies of the first and second sound signals may be detected by the existing noise reduction chip 3 and its peripheral circuits. Optionally, the noise reduction chip 3 may adopt a digital signal processor of an ADSP or DRA series model, and the digital-to-analog conversion circuit 4 may also include a digital-to-analog conversion chip and peripheral circuits required by the digital-to-analog conversion chip.
In an optional embodiment, the first microphone 1 collects the first sound signal to achieve noise reduction, and the first sound signal can be connected to the vehicle-mounted multimedia host 6, so that the vehicle-mounted multimedia host 6 receives the first sound signal through the connection with the vehicle-mounted multimedia host 6 and performs voice recognition processing. The vehicle-mounted multimedia host 6 is connected with the first microphone 1, can receive voice signals of people in the vehicle, namely first voice signals, and can realize voice control of the vehicle-mounted multimedia host 6 through voice after voice recognition processing is carried out on the first voice signals, such as music playing, telephone dialing and the like.
If the number of the first microphones 1 and/or the second microphones 2 is multiple, the noise reduction chip 3 is connected to the multiple first microphones 1 and/or the multiple second microphones 2 respectively, which may require a large number of buses, waste the buses, and increase the bus cost.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a noise reduction system according to an embodiment of the present disclosure; the number of the first microphones 1 of the automobile audio bus 7 is at least one; the noise reduction chip 3 is connected with the first microphone 1 through a car audio bus 7.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a noise reduction system according to an embodiment of the present disclosure; the number of the second microphones 2 of the automobile audio bus 7 is at least one; the noise reduction chip 3 is connected with the second microphone 2 through a car audio bus 7.
In a third alternative implementation manner, please refer to fig. 4, where fig. 4 is a schematic structural diagram of a noise reduction system provided in an embodiment of the present application; the number of the first microphones 1 is at least one; the number of the second microphones 2 is at least one; the noise reduction chip 3 is connected with the plurality of first microphones 1 and the plurality of second microphones 2 through a car audio bus 7.
The car audio bus is an A2B bus, the topological structure of the A2B bus is a daisy chain structure, and therefore, compared with the way that the noise reduction chip 3 is respectively connected with the first microphones 1 and/or the second microphones 2, the noise reduction chip 3 is connected with the first microphones 1 and/or the second microphones 2 through the daisy chain structure, and the bus is saved.
In an alternative embodiment, the number of first microphones 1 is two; a first microphone 1 is arranged on the roof of a vehicle close to the windshield of the vehicle corresponding to a main driver seat in the vehicle and mainly can collect voice signals of people on the main driver seat; the other first microphone 1 is used on the roof of the passenger seat corresponding to the windshield of the vehicle, and can mainly collect voice signals of people on the passenger seat. Optionally, the first microphone 1 is a directional microphone, for example, collects signals within 60 degrees left and right of the microphone.
In order to collect the second sound signal of the second frequency range of the noise sound wave in the vehicle as accurately as possible, the second microphone 2 is used for collecting the sound signal transmitted from the outside to the inside of the vehicle, and mainly includes noise generated by the rotation of a chassis engine in a carriage and noise generated by the friction between tires and the ground. Thus, in an alternative embodiment, the number of second microphones 2 is four; the first second microphone 2 is arranged on the inner side of the front left door of the vehicle and close to the chassis of the vehicle; the second microphone 2 is arranged on the inner side of the front right door of the vehicle and close to the chassis of the vehicle; the third second microphone 2 is arranged on the inner side of the rear left door of the vehicle, close to the chassis of the vehicle; the fourth second microphone 2 is provided on the inner side of the rear right door of the vehicle at a position close to the vehicle chassis. Alternatively, the second microphone 2 is an omnidirectional microphone, and can equally receive sound in each direction.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. A noise reduction system applied to a vehicle is characterized by comprising a first microphone (1), a second microphone (2), a noise reduction chip (3), a loudspeaker (5), a digital-to-analog conversion circuit (4) and a vehicle-mounted multimedia host (6);
the first microphone (1) is respectively connected with the noise reduction chip (3) and the vehicle-mounted multimedia host (6), and the first microphone (1) collects a first sound signal in a first frequency range including a voice sound wave and a partial noise sound wave of personnel in a vehicle and sends the first sound signal to the noise reduction chip (3) and the vehicle-mounted multimedia host (6);
the second microphone (2) is connected with the noise reduction chip (3), and the second microphone (2) collects a second sound signal of a second frequency range including noise sound waves in the vehicle and sends the second sound signal to the noise reduction chip (3);
the noise reduction chip (3) is connected with the digital-to-analog conversion circuit (4), receives the first sound signal and the second sound signal, generates a digital noise reduction signal and sends the digital noise reduction signal to the digital-to-analog conversion circuit (4), wherein the noise reduction signal is an inverse wave of a third sound signal obtained by removing the frequency overlapping part of the first sound signal and the second sound signal from the second sound signal;
the digital-to-analog conversion circuit (4) is connected with the loudspeaker (5) and is used for converting the received digital noise reduction signal into an analog noise reduction signal and sending the analog noise reduction signal to the loudspeaker (5);
the loudspeaker (5) receives and plays the analog noise reduction signal;
and the vehicle-mounted multimedia host receives the first sound signal and performs voice recognition processing.
2. The noise reduction system according to claim 1, characterized in that the number of first microphones (1) is at least one; the noise reduction chip (3) is connected with the first microphone (1) through an automobile audio bus (7).
3. The noise reduction system according to claim 1, characterized in that the number of second microphones (2) is at least one; the noise reduction chip (3) is connected with the second microphone (2) through an automobile audio bus (7).
4. The noise reduction system according to claim 1, characterized in that the first microphone (1) is a directional microphone.
5. The noise reduction system according to claim 1, characterized in that the second microphone (2) is an omni-directional microphone.
6. The noise reduction system according to claim 1, characterized in that the number of first microphones (1) is two;
one of the first microphones (1) is used for being arranged on the roof of a main driver seat corresponding to the position close to the windshield of the vehicle; the other first microphone (1) is used for being arranged on the roof of a passenger seat in the vehicle, which is close to the windshield of the vehicle.
7. The noise reduction system according to claim 1, characterized in that the number of second microphones (2) is four;
the first second microphone (2) is arranged on the inner side of the front left door of the vehicle, close to the chassis of the vehicle;
the second microphone (2) is arranged on the inner side of the front right door of the vehicle and close to the chassis of the vehicle;
the third second microphone (2) is arranged on the inner side of the rear left door of the vehicle, close to the chassis of the vehicle;
and the fourth second microphone (2) is arranged on the inner side of the rear right door of the vehicle, close to the chassis of the vehicle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922232830.8U CN211296936U (en) | 2019-12-12 | 2019-12-12 | Noise reduction system applied to vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922232830.8U CN211296936U (en) | 2019-12-12 | 2019-12-12 | Noise reduction system applied to vehicle |
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| CN211296936U true CN211296936U (en) | 2020-08-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111933103A (en) * | 2020-09-08 | 2020-11-13 | 湖北亿咖通科技有限公司 | Vehicle active noise reduction system, active noise reduction method and computer storage medium |
| CN112672255A (en) * | 2020-12-26 | 2021-04-16 | 东风汽车集团有限公司 | Method and device for adaptively adjusting volume of sound source of whole vehicle |
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2019
- 2019-12-12 CN CN201922232830.8U patent/CN211296936U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111933103A (en) * | 2020-09-08 | 2020-11-13 | 湖北亿咖通科技有限公司 | Vehicle active noise reduction system, active noise reduction method and computer storage medium |
| CN111933103B (en) * | 2020-09-08 | 2024-01-05 | 亿咖通(湖北)技术有限公司 | Active noise reduction system for vehicle, active noise reduction method and computer storage medium |
| CN112672255A (en) * | 2020-12-26 | 2021-04-16 | 东风汽车集团有限公司 | Method and device for adaptively adjusting volume of sound source of whole vehicle |
| CN112672255B (en) * | 2020-12-26 | 2022-06-28 | 东风汽车集团有限公司 | Method and device for adaptively adjusting volume of sound source of whole vehicle |
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Effective date of registration: 20220324 Address after: 430051 No. b1336, chuanggu startup area, taizihu cultural Digital Creative Industry Park, No. 18, Shenlong Avenue, Wuhan Economic and Technological Development Zone, Wuhan, Hubei Province Patentee after: Yikatong (Hubei) Technology Co.,Ltd. Address before: No.c101, chuanggu start up zone, taizihu cultural Digital Industrial Park, No.18 Shenlong Avenue, Wuhan Economic and Technological Development Zone, Hubei Province Patentee before: HUBEI ECARX TECHNOLOGY Co.,Ltd. |