CN111252006A - Directivity adjusting method and device for centrally-mounted loudspeaker - Google Patents
Directivity adjusting method and device for centrally-mounted loudspeaker Download PDFInfo
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- CN111252006A CN111252006A CN201811454127.5A CN201811454127A CN111252006A CN 111252006 A CN111252006 A CN 111252006A CN 201811454127 A CN201811454127 A CN 201811454127A CN 111252006 A CN111252006 A CN 111252006A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R2011/0042—Arrangements for holding or mounting articles, not otherwise provided for characterised by mounting means
- B60R2011/008—Adjustable or movable supports
- B60R2011/0085—Adjustable or movable supports with adjustment by rotation in their operational position
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- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
The invention relates to the technical field of vehicles, and provides a directivity adjusting method and device for a center speaker. The directivity adjusting method of the center speaker comprises the following steps: detecting ear positions of front passengers; and adjusting the rotation angle of the center speaker to change the directivity of the center speaker, wherein the changed directivity requirement can ensure that the audio emitted by the center speaker is refracted to the ear position of the front passenger through the front windshield of the vehicle. The invention can adjust the directivity of the middle speaker at any time by automatically rotating the angle of the middle speaker, so that the audio frequency emitted by the middle speaker is refracted to the height of the ears of the front passenger through the front windshield, and the audio frequency received by the front passenger has enough spaciousness, clang and intimate feeling, thereby bringing high-quality music experience to the passenger.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a directivity adjusting method and device for a center speaker.
Background
At present, the effect of a center speaker is often ignored in an automobile sound, the directivity of the center speaker is crucial to the hearing experience of front passengers, the installation position and the directivity of the center speaker are fixed during the design in the front period, and the directivity of the center speaker cannot be adjusted according to the height of the front passengers. With the increase of the directivity and the angle of human ears of the center speaker, the energy attenuation of the audio frequency is faster, so that passengers in front row feel weak and dim voice and feel stuffy space, and therefore the center speaker needs to have stronger directivity.
Disclosure of Invention
In view of this, the present invention is directed to a directivity adjustment method for a center speaker, so as to solve the problem that the existing center speaker has fixed directivity and affects the music experience of front passengers.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a directivity adjustment method of a center speaker includes: detecting ear positions of front passengers; and adjusting the rotation angle of the center speaker to change the directivity of the center speaker, wherein the changed directivity requirement can ensure that the audio emitted by the center speaker is refracted to the ear position of the front passenger through the front windshield of the vehicle.
Further, the detecting the ear position of the front passenger comprises any one of the following: collecting image information of a front passenger, and identifying the image information to analyze the ear position of the front passenger; and/or collecting the audio information of the front passenger through sound collecting modules respectively fixed at the positions of the roofs of all the vehicle seats, calculating the difference value of the distances from the front passenger to different sound collecting modules according to the time of collecting the audio information by all the sound collecting modules, carrying out Fourier spectrum analysis according to the difference value to determine the mouth position of the front passenger, and deducing the ear position of the front passenger according to the mouth position; and/or detecting the head position of the passenger through an ultrasonic sensor fixed at the ceiling position of the front seat, and deducing the ear position of the front passenger according to the head position.
Further, the adjusting the rotation angle of the center speaker comprises: based on the ear positions of the front passengers, the distances of the center speakers and the front passengers relative to the front windshield glass in the front-rear direction of the vehicle, the distances of the center speakers relative to the front windshield glass in the up-down direction of the vehicle, and the inclination angles of the front windshield glass relative to the front-rear direction of the vehicle, the rotation angle of the center speaker relative to the up-down direction of the vehicle when the audio emitted by the center speaker is refracted to the ear positions of the front passengers through the front windshield glass is calculated by utilizing a trigonometric function.
Further, the directivity adjustment method of the center speaker further includes: detecting a distribution of front passengers prior to said detecting ear positions of front passengers; if only one driver is in the vehicle, the detecting the ear position of the front passenger comprises: detecting an ear position of the driver; if two persons, namely the primary driver and the secondary driver, exist in the vehicle, the detecting the ear positions of the front-row passengers comprises the following steps: the ear heights of the primary driver and the secondary driver are detected respectively, and the average value of the two is calculated as the ear position of the finally detected front passenger.
Further, the detecting the ear heights of the primary driver and the secondary driver, respectively, and calculating an average value of the detected ear heights as the ear positions of the finally detected front passenger may include: and detecting whether the height of the ear of the co-pilot is lower than a preset height, and if so, enabling the height of the ear of the co-pilot not to participate in the calculation of the average value.
Compared with the prior art, the directivity method of the center speaker has the following advantages:
(1) the directivity adjusting method of the mid-mounted loudspeaker adjusts the directivity of the mid-mounted loudspeaker constantly by automatically rotating the angle of the mid-mounted loudspeaker, so that the audio frequency emitted by the mid-mounted loudspeaker is refracted to the height of the ears of the front passengers through the front windshield, the voice frequency received by the front passengers has enough spaciousness, and the directivity adjusting method of the mid-mounted loudspeaker is strong and thorough, brings high-quality music experience to the passengers, and increases the scientific and technological perception of the whole vehicle.
(2) The directivity adjusting method of the mid-mounted loudspeaker can adjust the directivity of the mid-mounted loudspeaker through the distribution, the importance degree and the like of front passengers so as to mainly meet the music experience of a main driver.
The invention also aims to provide a directivity adjusting device of the center speaker, so as to solve the problem that the existing center speaker has fixed directivity and affects the music experience of front passengers.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a directivity adjustment device of a center speaker, comprising: a detection unit for detecting the ear position of a front passenger; and the adjusting unit is used for adjusting the rotation angle of the center speaker to change the directivity of the center speaker, and the changed directivity requirement can ensure that the audio emitted by the center speaker is refracted to the ear position of the front passenger through the front windshield of the vehicle.
Further, the detection unit includes: the image acquisition module is used for acquiring image information of front passengers; and an image recognition module for recognizing the image information to analyze the ear position of the front passenger; and/or the detection unit comprises: the sound acquisition modules are fixed at the positions of the roofs of all the vehicle seats and used for acquiring the audio information of the front passengers; the spectrum analysis module is used for calculating the difference value of the distances from the front passenger to different sound collection modules according to the time of collecting the audio information by each sound collection module, performing Fourier spectrum analysis according to the difference value to determine the mouth position of the front passenger, and deducing the ear position of the front passenger according to the mouth position; and/or the detection unit comprises: the ultrasonic sensor is fixed at the position of the ceiling of the front seat and is used for detecting the head top position of a passenger; and the ultrasonic analysis module is used for deducing the ear position of the front passenger according to the head top position detected by the ultrasonic sensor.
Further, the adjusting unit is configured to adjust the rotation angle of the center speaker, and includes: based on the ear positions of the front passengers, the distances of the center speakers and the front passengers relative to the front windshield glass in the front-rear direction of the vehicle, the distances of the center speakers relative to the front windshield glass in the up-down direction of the vehicle, and the inclination angles of the front windshield glass relative to the front-rear direction of the vehicle, the rotation angle of the center speaker relative to the up-down direction of the vehicle when the audio emitted by the center speaker is refracted to the ear positions of the front passengers through the front windshield glass is calculated by utilizing a trigonometric function.
Further, the detection means is configured to detect the distribution of the front passenger before detecting the ear position of the front passenger, detect only the ear position of the driver if there is only one driver in the vehicle, and detect the ear heights of the primary driver and the secondary driver if there are two drivers in the vehicle, and calculate the average value of the detected ear positions as the ear position of the front passenger.
Further, when both the primary driver and the secondary driver exist in the vehicle, the detecting unit is further configured to detect whether the height of the ear of the secondary driver is lower than a preset height, and if so, the height of the ear of the secondary driver is not involved in the calculation of the average value.
Compared with the prior art, the directivity adjusting device of the center speaker and the directivity adjusting method of the center speaker have the same advantages, and are not repeated herein.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart illustrating a directivity adjustment method for a center speaker according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the hardware distribution within the vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the adjustment of the rotation angle of the center speaker according to the ear position of the front passenger in the embodiment of the present invention;
fig. 4 is a schematic diagram of calculating a rotation angle of a center speaker by using trigonometric functions according to an embodiment of the present invention;
FIG. 5 is a functional block diagram of center speaker directivity according to the ear height of a front passenger in an example of an embodiment of the present invention; and
fig. 6(a) -6 (c) are schematic structural diagrams of a directivity adjustment device of a center speaker according to an embodiment of the present invention.
Description of reference numerals:
1. a camera; 2. a microphone; 3. a mid-mounted speaker;
610. a detection unit; 620. an adjustment unit;
611a, an image acquisition module; 612a, an image recognition module;
611b, a sound collection module; 612b, a spectrum analysis module;
611c, an ultrasonic sensor; 612c, an ultrasonic analysis module.
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a flow chart of a directivity adjustment method of a center speaker according to an embodiment of the present invention, which is applied to a vehicle, and the directivity refers to a direction in which a transducer response passes through a specified plane of an acoustic center as a function of a direction of a transmitted or incident sound wave when a frequency is fixed, and can be understood as a direction in which the center speaker emits audio in the embodiment of the present invention.
As shown in fig. 1, the directivity adjustment method of the center speaker includes:
in step S110, the ear position of the front passenger is detected.
Step S120, adjusting the rotation angle of the center speaker to change the directivity thereof, wherein the changed directivity requirement can make the audio emitted by the center speaker be refracted to the ear position of the front passenger through the front windshield of the vehicle.
In step S110, the ear position of the front passenger can be detected by any one of the following schemes:
1) the method comprises the steps of collecting image information of a front passenger, and identifying the image information to analyze the position of the ear of the front passenger.
For example, image information of front passengers can be collected in real time through a 360 ° rotating camera, and distribution of passengers, positions of ears of passengers, and the like can be analyzed through image recognition of the image information. The image recognition is a technology for processing, analyzing and understanding the acquired images by using a professional algorithm to recognize various targets and objects in different modes. With the continuous development of image recognition technology, various image recognition chips are available in the market at present.
2) The method comprises the steps that audio information of front passengers is collected through sound collection modules respectively fixed at the positions of roofs of all vehicle seats, the difference value of distances from the front passengers to different sound collection modules is calculated according to the time when the audio information is collected by all the sound collection modules, Fourier spectrum analysis is carried out according to the difference value to determine the positions of mouths of the front passengers, and then the positions of ears of the front passengers are deduced according to the positions of the mouths.
For example, the sound collection module is, for example, a microphone, for four vehicles, four microphones may be placed at four ceiling positions in the vehicle, when the front passenger speaks to make a sound, the microphones installed at various positions in the vehicle can collect the audio signals made by the passenger, the distance from the passenger to each microphone is different due to the fixed and different placement positions of the microphones, the time for the passenger to collect the audio signals is also different for each microphone, since the propagation speed of the sound in the air is known as a constant V, the difference between the distances from the passenger to the different microphones can be calculated according to the formula D (T1-T2), where T1 and T2 are the time for the different microphones to collect the passenger audio signals, and then the fourier spectrum analysis chip is used to perform fourier spectrum analysis based on the difference, so as to obtain the specific position of the front passenger's mouth in the vehicle, the ear is typically 5cm above the mouth, so that the position of the passenger's ear in the car can be inferred. Among them, fourier spectrum analysis is information (e.g., amplitude, power, phase, intensity, etc.) that converts a complex audio signal into a simple signal of different frequencies.
3) The head position of the passenger is detected by an ultrasonic sensor fixed at the ceiling position of the front seat, and the ear position of the front passenger is deduced according to the head position.
For example, the ultrasonic sensor detects the position of the top of the head of a person, and the ears of the person are typically positioned about 15cm below the top of the head, so that the position of the ears of the passenger in the vehicle can be inferred.
It should be noted that in a preferred embodiment, any two or three of the above three schemes can be combined to detect the ear position of the front passenger, so as to optimize the calculation process, form redundancy or ensure the accuracy of the calculation result.
In step S120, a rotation angle of the center speaker with respect to the vehicle up-down direction when the audio emitted from the center speaker is refracted through the front windshield to the ear position of the front passenger may be calculated using a trigonometric function based on the ear position of the front passenger, the distance of the center speaker and the front passenger with respect to the front windshield in the vehicle front-back direction, the distance of the center speaker with respect to the front windshield in the vehicle up-down direction, and the inclination angle of the front windshield with respect to the vehicle front-back direction.
In an example, fig. 2 is a schematic diagram of a hardware distribution of the interior of a vehicle in an embodiment of the present invention, two cameras 1 capable of automatically rotating by 360 ° are disposed in front of a front seat position in the vehicle, four microphones 2 (the interior of the vehicle may BE disposed according to the actual vehicle) are set, a position of a center speaker 3 is set as a 3D origin of coordinates, a left-right direction of the vehicle is an X axis, a front-back direction is a Y axis, and an up-down direction is a Z axis, fig. 3 is a schematic diagram of adjusting a center speaker rotation angle according to a front passenger ear position in an embodiment of the present invention based on a coordinate system constructed in fig. 2, in which an L line represents a front windshield, α represents a front windshield L inclination angle with respect to a vehicle front-back direction (Y axis), B represents a center speaker position, AB represents a distance from the center speaker to the front windshield L in the Y axis direction, BE represents a distance from the vehicle up-down direction (Z axis) to the front windshield L, C represents a passenger position, AC represents a distance from the front passenger to the front windshield L, D represents a position of a passenger D ', D ' represents a distance from the front windshield L when an audio frequency of the front speaker C ' is changed from the front ear position of the front speaker C, D ' represented by a change from the front ear angle of the front windshield L ' represented by a front ear angle of a front ear angle, D ', β, D ' represented by a front ear angle of a front ear.
Referring to fig. 4, under the condition that AB, AC, AD, BC, DE, h and α are known, according to the characteristics that the triangle MDD ' is similar to the triangle CDD ', the triangle MFD ' is similar to the triangle HFI, the angle FEB is the value of the angle α plus 90 degrees, and β 1 is β 2, the calculation formula of θ can be determined through the respective trigonometric functions (such as sin, cos, etc.) of the angle α and the angle θ as follows:
the specific algorithm deduces the conventional trigonometric function calculation in the process of attribute geometric operation, so that the process is not repeated.
Further, the directivity adjustment method of the center speaker according to the embodiment of the present invention may further include: detecting a distribution of front passengers prior to said detecting ear positions of front passengers. The method for detecting the distribution of the front passengers may be the same as the method for detecting the positions of the ears of the front passengers, that is, any one or more of the three schemes for detecting the positions of the ears of the front passengers may be adopted.
Here, the distribution of the front passenger is mainly a case where only one driver is present in the vehicle or two primary and secondary drivers are present in the vehicle.
If there is only one driver in the vehicle, in step S110, the detecting the ear position of the front passenger may include: detecting an ear position of the driver.
If there are two primary and secondary drivers in the vehicle, in step S110, the detecting the ear position of the front passenger includes: the ear heights of the primary driver and the secondary driver are detected respectively, and the average value of the two is calculated as the ear position of the finally detected front passenger. In this way, in step S120, the rotation angle of the center speaker is adjusted based on the average value, so that the directivity can satisfy the average value of the audio emitted by the center speaker being refracted to the ear heights of two front passengers through the front windshield of the vehicle, thereby improving the music experience of two persons at the same time.
However, when two persons, i.e., the primary driver and the secondary driver, are present in the vehicle, it is likely that the secondary driver is a child, and if the directivity of the center speaker is adjusted by the average of the height of the ear of the child and the height of the ear of the adult, the sound field of the vehicle is lowered due to a large difference between the heights of the child and the adult, which affects the user experience of the primary driver, which is more important. In this regard, in a preferred embodiment, in the process of detecting the ear heights of the primary driver and the secondary driver respectively and calculating the average value of the two, the method further includes detecting whether the ear height of the secondary driver is lower than a preset height, and if so, the ear height of the secondary driver is not involved in the calculation of the average value. The preset height may be set according to actual conditions, for example, set to 1m, and if the preset height is lower, the co-driver is likely to be a child.
An example of adjusting the center speaker directivity according to the ear height of the front passenger in the vehicle is described below, corresponding to the hardware distribution of the vehicle interior shown in fig. 2. Fig. 5 is a functional block diagram of a mid-speaker directivity according to the ear height of a front passenger in an example of an embodiment of the present invention. As shown in fig. 5, the following steps may be included:
firstly, the camera collects the image information of the front passengers, and the image recognition is carried out through the image recognition chip so as to analyze the distribution and the ear positions of the front passengers. Meanwhile, a microphone array in the vehicle collects audio signals of front passengers, and Fourier spectrum analysis is carried out on the audio signals through a spectrum analysis chip so as to analyze the distribution and the ear positions of the front passengers.
Next, information processing including the calculation of the average value of the ear heights in the above-mentioned case of two persons for the front passenger, the judgment of the possibility that the passenger is a child, and the calculation of the rotation angle θ that the center speaker should have is performed by an audio processing chip according to the distribution of the front passenger and the ear position. And the sound effect processing chip generates a rotation instruction according to the information processing result, wherein the rotation instruction comprises a rotation angle theta of the middle speaker.
And finally, the motor of the middle speaker receives the rotation instruction sent by the sound effect processing chip, and drives the middle speaker to rotate so that the directivity of the middle speaker points to the calculated ear height of the front passenger.
In conclusion, the directivity adjusting method of the center speaker in the embodiment of the invention adjusts the directivity of the center speaker at any time by automatically rotating the angle of the center speaker, so that the audio emitted by the center speaker is refracted to the height of the ears of the front passengers through the front windshield, and the audio received by the front passengers has enough spaciousness, strength and intimacy, thereby bringing high-quality music experience to the passengers and simultaneously increasing the scientific and technological perception of the whole vehicle. In addition, the directivity adjusting method of the center speaker in the embodiment of the invention can adjust the directivity of the center speaker through the distribution, the importance degree and the like of the front passengers, so as to mainly meet the music experience of the main driver.
Fig. 6(a) -6 (c) are schematic structural diagrams of a directivity adjustment device of a center speaker according to an embodiment of the present invention, where the directivity adjustment device of the center speaker is based on the same inventive concept as the above-mentioned embodiment of the directivity adjustment method of the center speaker.
As shown in fig. 6(a) -6 (c), the directivity adjustment device of the center speaker includes: a detection unit 610 for detecting the ear position of the front passenger; and an adjusting unit 620 for adjusting the rotation angle of the center speaker to change the directivity thereof, and the changed directivity requirement enables the audio emitted by the center speaker to be refracted to the ear position of the front passenger through the front windshield of the vehicle.
As shown in fig. 6(a), in a preferred embodiment, the detecting unit 610 includes: an image collecting module 611a, configured to collect image information of a front passenger; and an image recognition module 612a for recognizing the image information to analyze the ear position of the front passenger. The image capturing module 611a is, for example, a camera, and the image recognizing module 612a is, for example, a conventional image recognizing chip.
In another preferred embodiment, as shown in fig. 6(b), the detecting unit 610 includes: a sound collection module 611b fixed at a ceiling position of each seat for collecting audio information of the front passenger; and a spectrum analysis module 612b, configured to calculate a difference between distances from the front passenger to different sound collection modules according to the time when the sound collection modules 611b collect the audio information, perform fourier spectrum analysis according to the difference to determine a position of a mouth of the front passenger, and infer an ear position of the front passenger according to the position of the mouth. The sound collection module 611b is, for example, a microphone, and the spectrum analysis module 612b is, for example, a control chip capable of implementing conventional spectrum analysis.
In yet another preferred embodiment, as shown in fig. 6(c), the detecting unit 610 includes: an ultrasonic sensor 611c fixed at a ceiling position of the front seat for detecting a head position of the passenger; and an ultrasonic analysis module 612c for inferring the ear position of the front passenger from the overhead position detected by the ultrasonic sensor. The ultrasonic analysis module 612c may be integrated in the ultrasonic sensor 611c, and is, for example, a control chip capable of implementing conventional ultrasonic analysis.
Further, the adjusting unit 620 for adjusting the rotation angle of the center speaker may include: based on the ear positions of the front passengers, the distances of the center speakers and the front passengers relative to the front windshield glass in the front-rear direction of the vehicle, the distances of the center speakers relative to the front windshield glass in the up-down direction of the vehicle, and the inclination angles of the front windshield glass relative to the front-rear direction of the vehicle, the rotation angle of the center speaker relative to the up-down direction of the vehicle when the audio emitted by the center speaker is refracted to the ear positions of the front passengers through the front windshield glass is calculated by utilizing a trigonometric function.
The adjusting unit 620 may be configured by a conventional controller having an audio processing chip.
Further, the detecting unit 610 is further configured to detect the distribution of the front passenger before detecting the ear position of the front passenger, detect only the ear position of the driver if there is only one driver in the vehicle, and detect the ear heights of the primary driver and the secondary driver if there are two drivers in the vehicle, and calculate an average value of the detected ear positions as the ear position of the front passenger finally detected.
Further, when both the primary driver and the secondary driver are in the vehicle, the detecting unit 610 is further configured to detect whether the ear height of the secondary driver is lower than a preset height, and if so, the ear height of the secondary driver is not involved in the calculation of the average value.
It should be noted that, for details and effects of the directivity adjustment device of the center speaker according to the embodiment of the present invention, reference may be made to the foregoing embodiment of the directivity adjustment method of the center speaker, and therefore, detailed description is not repeated herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A directivity adjustment method of a center speaker is characterized in that the directivity adjustment method of the center speaker comprises the following steps:
detecting ear positions of front passengers; and
the rotation angle of the center speaker is adjusted to change the directivity of the center speaker, and the changed directivity requirement enables the audio emitted by the center speaker to be refracted to the ear position of the front passenger through the front windshield of the vehicle.
2. A directivity adjustment method of a center speaker according to claim 1, characterized in that the detection of the ear position of the front passenger includes any one of:
collecting image information of a front passenger, and identifying the image information to analyze the ear position of the front passenger; and/or
Acquiring audio information of front passengers through sound acquisition modules respectively fixed at the positions of roofs of all vehicle seats, calculating the difference value of the distances from the front passengers to different sound acquisition modules according to the time for acquiring the audio information by all the sound acquisition modules, performing Fourier spectrum analysis according to the difference value to determine the positions of mouths of the front passengers, and deducing the positions of ears of the front passengers according to the positions of the mouths; and/or
The head position of the passenger is detected by an ultrasonic sensor fixed at the ceiling position of the front seat, and the ear position of the front passenger is deduced according to the head position.
3. The directivity adjustment method of a center speaker according to claim 1, wherein the adjusting of the rotation angle of the center speaker includes:
based on the ear positions of the front passengers, the distances of the center speakers and the front passengers relative to the front windshield glass in the front-rear direction of the vehicle, the distances of the center speakers relative to the front windshield glass in the up-down direction of the vehicle, and the inclination angles of the front windshield glass relative to the front-rear direction of the vehicle, the rotation angle of the center speaker relative to the up-down direction of the vehicle when the audio emitted by the center speaker is refracted to the ear positions of the front passengers through the front windshield glass is calculated by utilizing a trigonometric function.
4. The directivity adjustment method of a center speaker according to claim 1, characterized in that the directivity adjustment method of a center speaker further includes:
detecting a distribution of front passengers prior to said detecting ear positions of front passengers;
if only one driver is in the vehicle, the detecting the ear position of the front passenger comprises: detecting an ear position of the driver;
if two persons, namely the primary driver and the secondary driver, exist in the vehicle, the detecting the ear positions of the front-row passengers comprises the following steps: the ear heights of the primary driver and the secondary driver are detected respectively, and the average value of the two is calculated as the ear position of the finally detected front passenger.
5. A directivity adjustment method of a center speaker according to claim 4, wherein the detecting the ear heights of the primary driver and the secondary driver, respectively, and calculating the average of the two as the finally detected ear position of the front passenger comprises:
and detecting whether the height of the ear of the co-pilot is lower than a preset height, and if so, enabling the height of the ear of the co-pilot not to participate in the calculation of the average value.
6. A directivity adjustment device of a center speaker, characterized in that the directivity adjustment device of the center speaker comprises:
a detection unit for detecting the ear position of a front passenger; and
and the adjusting unit is used for adjusting the rotation angle of the center speaker to change the directivity of the center speaker, and the changed directivity requirement can ensure that the audio emitted by the center speaker is refracted to the ear position of the front passenger through the front windshield of the vehicle.
7. The directivity adjustment device of a center speaker according to claim 6,
the detection unit includes: the image acquisition module is used for acquiring image information of front passengers; and an image recognition module for recognizing the image information to analyze the ear position of the front passenger; and/or
The detection unit includes: the sound acquisition modules are fixed at the positions of the roofs of all the vehicle seats and used for acquiring the audio information of the front passengers; the spectrum analysis module is used for calculating the difference value of the distances from the front passenger to different sound collection modules according to the time of collecting the audio information by each sound collection module, performing Fourier spectrum analysis according to the difference value to determine the mouth position of the front passenger, and deducing the ear position of the front passenger according to the mouth position; and/or
The detection unit includes: the ultrasonic sensor is fixed at the position of the ceiling of the front seat and is used for detecting the head top position of a passenger; and the ultrasonic analysis module is used for deducing the ear position of the front passenger according to the head top position detected by the ultrasonic sensor.
8. The directivity adjustment device of the center speaker according to claim 6, wherein the adjustment unit is configured to adjust the rotation angle of the center speaker, and includes:
based on the ear positions of the front passengers, the distances of the center speakers and the front passengers relative to the front windshield glass in the front-rear direction of the vehicle, the distances of the center speakers relative to the front windshield glass in the up-down direction of the vehicle, and the inclination angles of the front windshield glass relative to the front-rear direction of the vehicle, the rotation angle of the center speaker relative to the up-down direction of the vehicle when the audio emitted by the center speaker is refracted to the ear positions of the front passengers through the front windshield glass is calculated by utilizing a trigonometric function.
9. The directivity adjustment device of a mid-speaker according to claim 6, characterized in that the detection means is further configured to detect the distribution of front passengers before detecting the ear positions of the front passengers, detect only the ear positions of the driver if there is only one driver in the vehicle, and detect the ear heights of the primary driver and the secondary driver if there are two primary and secondary drivers in the vehicle, respectively, and calculate the average value of the detected ear positions as the ear positions of the front passengers.
10. The directivity adjustment device of a center speaker according to claim 9,
when both the primary driver and the secondary driver exist in the vehicle, the detection unit is further used for detecting whether the height of the ears of the secondary driver is lower than a preset height, and if so, the height of the ears of the secondary driver is not involved in the calculation of the average value.
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