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CN-121973684-A - Noise reduction method for automobile headrest and automobile headrest

CN121973684ACN 121973684 ACN121973684 ACN 121973684ACN-121973684-A

Abstract

The application discloses a noise reduction method of an automobile headrest and the automobile headrest, and relates to the technical field of headrests. The headrest body and the headrest side wings are provided with noise reduction modules, so that the noise reduction range is enlarged. And acquiring head portraits of passengers corresponding to the automobile headrest, and analyzing and processing to obtain the spatial position information and the attitude angle information of the heads of the passengers relative to the side wings of the headrest and the headrest body. The calculation amount is small, and the requirement on hardware is low. The position information of the headrest side wings and the headrest body of the passenger is determined through the space position information and the posture angle information, so that the noise reduction module and the ears of the passenger keep stable relative positions, and the subsequent headrest posture adjustment mechanism is convenient to adjust. The headrest target deviation information can obtain specific information that the headrest needs to be deviated from the deviation between the actual position information and the historical position information of the passenger. The headrest posture adjusting structure is adjusted and simultaneously noise reduction is carried out, so that passengers can make noise at any time in the process of head rotation, and the noise reduction effect is improved.

Inventors

  • CHEN MENGYAO
  • ZHOU HU

Assignees

  • 科世达(上海)机电有限公司
  • 上海科世达-华阳汽车电器有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. The noise reduction method for the automobile headrest is characterized by being applied to the automobile headrest, wherein the automobile headrest comprises a head gesture detection module, a control module and a headrest gesture adjusting mechanism, and noise reduction modules are arranged on headrest side wings and a headrest body; the control headrest gesture detection module is used for collecting head portraits of passengers corresponding to the automobile headrest, and analyzing and processing the head portraits to obtain spatial position information and gesture angle information of the heads of the passengers relative to the headrest side wings and the headrest body; Determining headrest target offset information according to the space position information and the attitude angle information, wherein the headrest target offset information is obtained by predicting the actual position information of a headrest side wing and a headrest body where a passenger is located and the historical position information of the last acquisition period and/or the position information corresponding to the preset acquisition period of the headrest side wing and the headrest body where the passenger is located; and controlling the headrest posture adjusting mechanism to adjust the posture information of the current headrest according to the headrest target deviation information, and carrying out noise reduction on noise of the current headrest by utilizing the noise reduction module.
  2. 2. The noise reduction method of an automotive headrest according to claim 1, wherein determining headrest target offset information from spatial position information and attitude angle information includes: acquiring actual spatial position information and actual attitude angle information corresponding to a current acquisition period; acquiring a first mapping relation between a head coordinate system in which the space position information and the attitude angle information are located and a headrest coordinate system; Determining corresponding actual position information according to the actual spatial position information, the actual attitude angle information and the first mapping relation; Acquiring historical space position information and historical attitude angle information corresponding to the last acquisition period of the current acquisition period; determining corresponding historical position information according to the historical spatial position information, the historical attitude angle information and the first mapping relation; and determining headrest target offset information according to the actual position information and the historical position information.
  3. 3. The noise reduction method of an automotive headrest according to claim 2, wherein determining the corresponding actual position information from the actual spatial position information, the actual posture angle information, and the first map relation includes: Establishing a headrest coordinate system along the transverse direction, the longitudinal direction and the vertical direction of the automobile by taking the geometric center point of the headrest body as an origin, and calibrating the boundary coordinates of the headrest body and the opening and closing boundary coordinates of the headrest wings to form a space region range of the automobile headrest; A head coordinate system is established along the left-right direction, the front-back direction and the vertical direction of the head of the passenger by taking the geometric center point of the head of the passenger as an origin; converting first coordinate information of a head coordinate system in which the actual spatial position information and the actual attitude angle information are located into a headrest coordinate system to obtain second coordinate information; Determining first relative position information between the head of the passenger and the headrest body according to origin information and a spatial region range corresponding to the second coordinate information; Determining second relative position information between the ears of the passenger and the side wings of the headrest based on second coordinate information of a headrest coordinate system in which the actual attitude angle information is located; and determining actual position information according to the first relative position information and the second relative position information.
  4. 4. The noise reduction method of an automotive headrest according to claim 1, wherein determining headrest target offset information from spatial position information and attitude angle information includes: Acquiring historical space position information and historical attitude angle information corresponding to a preset acquisition period based on the current acquisition period; Acquiring a first mapping relation between a head coordinate system in which each piece of history spatial position information and each piece of history attitude angle information are located and a headrest coordinate system; determining corresponding historical position information according to the historical spatial position information, the historical attitude angle information and the first mapping relation; Trend fitting processing is carried out on the basis of the historical position information to obtain head movement trend information; Predicting and obtaining head target position information according to the head movement trend information; And determining headrest target offset information according to the head target position information and the current position information.
  5. 5. The noise reduction method of an automotive headrest according to claim 4, wherein performing a trend fitting process based on each of the history position information to obtain the head movement trend information includes: Determining a corresponding first change direction and a first change rate according to each historical attitude angle information; If the first change direction is the same change direction in a plurality of continuous sampling periods and the first change rate is greater than a preset speed, determining a trend direction corresponding to the head movement trend information; performing information fitting processing according to the historical position information to obtain motion information corresponding to the head motion trend information; And determining head movement trend information according to the trend direction and the movement information.
  6. 6. The noise reduction method of an automotive headrest according to claim 4, further comprising, after trend fitting processing based on each of the history position information, the step of: a behavior habit rule base corresponding to the passenger is obtained in advance, wherein the behavior habit rule base is obtained through extraction of each behavior habit cluster; Matching the habit rule base according to the historical behavior habits of the passengers to obtain first correction parameters; and correcting the head movement trend information according to the first correction parameters to obtain new head movement trend information, so as to enter the step of predicting head target position information according to the head movement trend information.
  7. 7. The noise reduction method of an automotive headrest according to claim 4, further comprising, after trend fitting processing based on each of the history position information, the step of: the method comprises the steps of obtaining a micro-expression movement rule base corresponding to a passenger in advance, wherein the micro-expression movement rule base is obtained through mapping relations among micro-expression of each eyeball, space position information and attitude angle information; Matching the micro-expression motion rule base according to the historical eyeball micro-expression of the passenger to obtain a second correction parameter; and correcting the head movement trend information according to the second correction parameters to obtain new head movement trend information, so as to enter the step of predicting head target position information according to the head movement trend information.
  8. 8. The noise reduction method of an automotive headrest according to claim 4, further comprising, after trend fitting processing based on each of the history position information, the step of: A road condition movement rule base of passengers under road condition events is obtained in advance, wherein the road condition movement rule base is obtained by extracting movement information of heads of the passengers under the road condition events; Presetting early warning execution operation information of a car navigation system on each history of forward road condition events; Matching a road condition movement rule base according to the historical road condition event to obtain a third correction parameter; And correcting the head movement trend according to the third correction parameters and the early warning execution operation information to obtain new head movement trend information, so as to enter the step of predicting and obtaining head target position information according to the head movement trend information.
  9. 9. The noise reduction method of an automobile headrest according to any one of claims 1 to 8, characterized in that noise in which the current headrest is located is subjected to noise reduction processing by the noise reduction module, comprising: Determining the relative position deviation of the noise reduction module of the current headrest and the ears of the passengers according to the headrest target deviation information, wherein the relative position deviation comprises distance position deviation, angle position deviation and comprehensive position deviation; Based on the distance position deviation, the angle position deviation and the comprehensive position deviation, respectively comparing the distance position deviation, the angle position deviation and the comprehensive position deviation with respective threshold values to determine respective corresponding noise reduction strategies; Noise reduction processing is carried out on the noise of the current headrest according to each noise reduction strategy; correspondingly, the determining process of the noise reduction strategy comprises the following steps: if the distance position deviation is smaller than 0, reducing the sound wave gain, and carrying out notch filtering on the howling frequency according to a howling suppression strategy; If the angular position deviation is not equal to 0, adjusting the phase modulation of the noise reduction module to correct the main lobe direction of the sound wave beam to the direction of the auditory canal, and acquiring the around-the-ear noise by utilizing a plurality of microphones on the side wings of the headrest to obtain a noise spectrum so as to realize noise reduction; And if the comprehensive position deviation is greater than 1, calling a mapping relation between the history deviation and the noise reduction parameters, matching a target parameter according to the mapping relation, and performing noise reduction processing according to the target parameter.
  10. 10. The automobile headrest is characterized by comprising a head posture detection module, a control module and a headrest posture adjustment mechanism, wherein noise reduction modules are arranged on headrest side wings and a headrest body; the headrest gesture detection module, the control module and the headrest gesture adjusting mechanism are sequentially connected, and the noise reduction module is connected with the control module; the headrest gesture detection module is used for acquiring head portraits of the heads of passengers corresponding to the automobile headrest, and analyzing and processing the head portraits to obtain spatial position information and gesture angle information of the heads of the passengers relative to the side wings of the headrest and the headrest body; The control module is configured to execute the steps of the noise reduction method for an automotive headrest according to any one of claims 1 to 9, so as to implement noise reduction processing.

Description

Noise reduction method for automobile headrest and automobile headrest Technical Field The application relates to the technical field of headrests, in particular to a noise reduction method of an automobile headrest and the automobile headrest. Background Conventional active noise reduction techniques typically focus on the control of overall noise in the vehicle, integrating a simple speaker or sensor into the headrest body, with a single function. The head area is easily affected by wind noise and tyre noise in multiple directions, and noise is increased when the audio and video play is caused by noise accompanying when a user looks at the rearview mirror of the vehicle left and right, so that the noise reduction effect is poor. Therefore, how to reduce noise to improve the noise reduction effect is needed to be solved by those skilled in the art. Disclosure of Invention The application aims to provide a noise reduction method of an automobile headrest and the automobile headrest, which are used for solving the problems of poor noise reduction effect caused by single noise reduction and large noise reduction sound. In order to solve the technical problems, the application provides a noise reduction method for an automobile headrest, which is applied to the automobile headrest, wherein the automobile headrest comprises a head gesture detection module, a control module and a headrest gesture adjusting mechanism, and both headrest side wings and a headrest body are provided with noise reduction modules; the control headrest gesture detection module is used for collecting head portraits of passengers corresponding to the automobile headrest, and analyzing and processing the head portraits to obtain spatial position information and gesture angle information of the heads of the passengers relative to the headrest side wings and the headrest body; Determining headrest target offset information according to the space position information and the attitude angle information, wherein the headrest target offset information is obtained by predicting the actual position information of a headrest side wing and a headrest body where a passenger is located and the historical position information of the last acquisition period and/or the position information corresponding to the preset acquisition period of the headrest side wing and the headrest body where the passenger is located; and controlling the headrest posture adjusting mechanism to adjust the posture information of the current headrest according to the headrest target deviation information, and carrying out noise reduction on noise of the current headrest by utilizing the noise reduction module. In one aspect, determining headrest target offset information from spatial position information and attitude angle information includes: acquiring actual spatial position information and actual attitude angle information corresponding to a current acquisition period; acquiring a first mapping relation between a head coordinate system in which the space position information and the attitude angle information are located and a headrest coordinate system; Determining corresponding actual position information according to the actual spatial position information, the actual attitude angle information and the first mapping relation; Acquiring historical space position information and historical attitude angle information corresponding to the last acquisition period of the current acquisition period; determining corresponding historical position information according to the historical spatial position information, the historical attitude angle information and the first mapping relation; and determining headrest target offset information according to the actual position information and the historical position information. On the other hand, determining corresponding actual position information according to the actual spatial position information, the actual attitude angle information and the first mapping relation includes: Establishing a headrest coordinate system along the transverse direction, the longitudinal direction and the vertical direction of the automobile by taking the geometric center point of the headrest body as an origin, and calibrating the boundary coordinates of the headrest body and the opening and closing boundary coordinates of the headrest wings to form a space region range of the automobile headrest; A head coordinate system is established along the left-right direction, the front-back direction and the vertical direction of the head of the passenger by taking the geometric center point of the head of the passenger as an origin; converting first coordinate information of a head coordinate system in which the actual spatial position information and the actual attitude angle information are located into a headrest coordinate system to obtain second coordinate information; Determining first relative position information between the head of the passenger and t