US-20260129389-A1 - Method, Apparatus, and System for Optimizing In-Cabin Sound field, and Readable Storage Medium

US20260129389A1US 20260129389 A1US20260129389 A1US 20260129389A1US-20260129389-A1

Abstract

Disclosed are a method, an apparatus, and a system for optimizing an in-cabin sound field, and a readable storage medium, which are applied to a sound control system of a target vehicle. The method includes: obtaining, upon detecting that a warning object appears in a caution zone corresponding to the target vehicle, a relative position parameter between the warning object in the caution zone and the target vehicle; reconstructing a sound field in the cabin of the target vehicle based on the relative position parameter to obtain a corresponding target chime source file; and outputting a corresponding audio control signal to each of the loudspeakers based on the target chime source file. Through implementation of the disclosure, an in-cabin passenger may easily know the orientation and movement information of a warning object via a 3D chime emitted by the sound control system.

Inventors

Shuyuan Sun
Yiming Meng
Xin Zhang

Assignees

AAC MICROTECH (CHANGZHOU) CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250207

Claims (9)

1 . A method for optimizing an in-cabin sound field, which is applied to a sound control system of a target vehicle, the sound control system being configured with a plurality of loudspeakers that are installed at different positions in a cabin of the target vehicle, wherein the method for optimizing an in-cabin sound field comprises: obtaining, upon detecting that a warning object appears in a caution zone corresponding to the target vehicle, a relative position parameter between the warning object in the caution zone and the target vehicle, wherein the relative position parameter reflects an orientation attribute and a distance attribute between the warning object and the target vehicle; reconstructing a sound field in the cabin of the target vehicle based on the relative position parameter to obtain a corresponding target chime source file; and outputting a corresponding audio control signal to each of the loudspeakers based on the target chime source file, wherein the audio control signal imparts a corresponding acoustic property to a chime emitted by a corresponding one of the loudspeaker so as to create, in the target vehicle, a sound field which reflects position and movement direction of the warning object, wherein an indicator of the acoustic property includes at least one of phase, amplitude, and frequency.
2 . The method for optimizing an in-cabin sound field according to claim 1 , wherein the reconstructing a sound field in the cabin of the target vehicle based on the relative position parameter to obtain a corresponding target chime source file comprises: fitting acoustic characteristics of an acoustic response of the warning object in a target sound field in the cabin of the target vehicle and an acoustic response in an ideal sound field based on the relative position parameter to determine a target transfer function acting on a digital filter of each of the loudspeakers, wherein an acoustic environment of the ideal sound field includes at least one of an anechoic chamber, a listening room, a reverberation chamber; and updating the target transfer function to a chime source file corresponding to the sound control system to obtain the target chime source file.
3 . The method for optimizing an in-cabin sound field according to claim 2 , wherein a first acoustic response corresponding to the target sound field is expressed as: S ⁡ ( x m , y m ) ⁢ ∑ n = 1 N [ H F ( n , m ) · H S ( n ) · H T ( n ) ] where S denotes an acoustic property indicator corresponding to the audio control signal; (x m , y m ) denotes the relative position parameter between the warning object and the target vehicle; H F (n, m) denotes the target transfer function acting on a digital filter of the nth loudspeaker when the relative position between the warning object and the target vehicle is (x m , y m ); H S (n) denotes an acoustoelectric transformation transfer function of the nth loudspeaker, a magnitude of which depends on a physical property of the corresponding loudspeaker; H T (n) denotes the acoustic transfer function from the nth loudspeaker to a target listening position, a magnitude of which is determined by an actual environment factor of the sound field in the cabin of the target vehicle; and N denotes the number of loudspeakers in the cabin of the target vehicle.
4 . The method for optimizing an in-cabin sound field according to claim 3 , wherein the sound control system is configured with five loudspeakers which are fixed in a console central area, in a right front door area, in a left front door area, in a left rear door area, and in a right rear door area in the cabin of the target vehicle, respectively; the fitting acoustic characteristics of an acoustic response of the warning object in a target sound field in the cabin of the target vehicle and an acoustic response in an ideal sound field based on the relative position parameter to determine a target transfer function acting on a digital filter of each of the loudspeakers comprises: substituting the relative position parameter to a first target computation equation to compute the target transfer function acting on the digital filter of each of the loudspeakers, wherein the first target computation equation is expressed as: [ H F ( 1 , m ) H F ( 2 , m ) H F ( 3 , m ) H F ( 4 , m ) H F ( 5 , m ) ] = H ⁡ ( x m , y m ) [ H S ( 1 ) 0 0 0 0 0 H S ( 2 ) 0 0 0 0 0 H S ( 3 ) 0 0 0 0 0 H S ⁢ ( 4 ) 0 0 0 0 0 H S ( 5 ) ] - 1 [ H T ⁢ ( 1 ) H T ⁢ ( 2 ) H T ⁢ ( 3 ) H T ⁢ ( 4 ) H T ⁢ ( 5 ) ] - 1 where H (x m , y m ) denotes an acoustic transfer function from the warning object to a reference listening position in the ideal sound field.
5 . The method for optimizing an in-cabin sound field according to claim 4 , further comprising after the substituting the relative position parameter to a first target computation equation: substituting the relative position parameter to a second target computation equation to compute the target transfer function acting on the digital filter of each of the loudspeakers in a case that a solution of the first target computation equation is not unique, wherein the second target computation equation is expressed as: Min ⁢ { ❘ "\[LeftBracketingBar]" H ⁡ ( x m , y m ) - [ H F ( 1 ) H F ⁢ ( 2 ) H F ⁢ ( 3 ) H F ⁢ ( 4 ) H F ⁢ ( 5 ) ] ·  [ H S ( 1 ) 0 0 0 0 0 H S ( 2 ) 0 0 0 0 0 H S ( 3 ) 0 0 0 0 0 H S ⁢ ( 4 ) 0 0 0 0 0 H S ( 5 ) ] · [ H T ( 1 ) H T ⁢ ( 2 ) H T ⁢ ( 3 ) H T ⁢ ( 4 ) H T ⁢ ( 5 ) ] T ❘ "\[RightBracketingBar]" } where Min{ } denotes taking a minimum value, and ∥ denotes vector modulus.
6 . The method for optimizing an in-cabin sound field according to claim 3 , further comprising after outputting a corresponding audio control signal to each of the loudspeakers based on the target chime source file: computing, based on the first acoustic response of the target sound field, a second acoustic response corresponding to a chime actually received at the target listening position, wherein the second acoustic response is applied to optimize a generation model of the audio control signal in the target chime source file, the second acoustic response being expressed as: S Driver ( t ) = ∑ m = 0 M { [ S ⁡ ( x m , y m ) ⁢ ∑ n = 1 N [ H F ( n , m ) · H S ( n ) · H T ( n ) ] ] · δ ⁡ ( t - mT s ) } where t denotes time; S Driver (t) denotes the second acoustic response corresponding to time t; δ(t) denotes a unit sample sequence or a unit impulse sequence: δ ⁡ ( t ) = { 1 , t = 0 0 , t ≠ 0 ; M denotes a sample number reference value; T s denotes a sampling cycle; M = T T s - 1 , and T denotes the time period experienced by the warning object from entering the caution zone to leaving the caution zone.
7 . The method for optimizing an in-cabin sound field according to claim 1 , wherein the warning object is a further vehicle entering the caution zone; and the obtaining, upon detecting that a warning object appears in a caution zone corresponding to the target vehicle, a relative position parameter between the warning object in the caution zone and the target vehicle, comprises: obtaining, upon detecting that the warning object appears in the caution zone corresponding to the target vehicle, positioning information of the target vehicle and sampling position parameter of the further vehicle within a preset time period; predicting a movement trajectory of the further vehicle based on the sampling position parameter; and determining a relative position parameter between the further vehicle and the target vehicle at any time within an early-warning time period based on the position information and the movement trajectory, wherein the early-warning time period is a time period experienced by the further vehicle from entering the caution zone to leaving the caution zone, the early-warning time period being longer than the preset time period.
8 . An apparatus for optimizing an in-cabin sound field, which is applied to a sound control system of a target vehicle, the sound control system being configured with a plurality of loudspeakers that are installed at different positions in a cabin of the target vehicle, wherein the apparatus for optimizing an in-cabin sound field comprises: a parameter obtaining module configured to obtain, upon detecting that a warning object appears in a caution zone corresponding to the target vehicle, a relative position parameter between the warning object in the caution zone and the target vehicle, wherein the relative position parameter reflects an orientation attribute and a distance attribute between the warning object and the target vehicle; a sound field reconstructing module configured to reconstruct a sound field in the cabin of the target vehicle based on the relative position parameter to obtain a corresponding target chime source file; and a signal outputting module configured to output a corresponding audio control signal to each of the loudspeakers based on the target chime source file, wherein the audio control signal imparts a corresponding acoustic property to a chime emitted by a corresponding one of the loudspeaker so as to create, in the target vehicle, a sound field which reflects position and movement direction of the warning object, wherein an indicator of the acoustic property includes at least one of phase, amplitude, and frequency.
9 . A sound control system, comprising a memory, a processor, and a plurality of loudspeakers, wherein: the loudspeakers are installed at different positions in a cabin of a target vehicle, respectively, each of the loudspeakers playing a chine based on a corresponding audio control signal, respectively; the processor is configured to execute a computer program stored on the memory; and the processor, when executing the computer program, carries out respective steps in the method for optimizing an in-cabin sound field according to claim 1 .

Description

FIELD The present disclosure relates to sound field control, and more particularly relates to a method, an apparatus, and a system for optimizing an in-cabin sound field, and a readable storage medium. BACKGROUND With advancement in automobile cabin intelligence, users and the market pose new requirements on automobiles in aspects of visual sense, auditory sense, and tactile sense. Chiming is an important function of an automobile sound system. In conventional technologies, a majority of fossil-fueled vehicles still use a conventional audio play control solution that generally features playing back a sound via an interior loudspeaker at a fixed position with a fixed sound source and a fixed configuration parameter once a vehicle warning signal is triggered, which can only play a limited warning role but cannot acoustically reflect position information and movement feature of a warning object. To address this issue, some new-energy vehicles adopt a 3D-chime solution, i.e., once a vehicle warning signal is triggered, alert demands in different scenarios may be handled using an alterable audio source or handled by controlling sound reproduction sequence of different loudspeakers in the vehicle cabin. However, this 3D-chime solution can only alleviate the above issue to a limited extent, which cannot faithfully reflect position information and movement feature of a warning object in real time, so that the acoustic experience offered thereby is till unsatisfactory. SUMMARY The disclosure provides a method, an apparatus, and a system for optimizing an in-cabin sound field, and a readable storage medium, which can at least solve a problem in conventional technologies that a chime of a vehicle sound system cannot faithfully reflect position information and movement feature of a warning object in real time. In a first aspect of the implementations of the disclosure, there is provided a method for optimizing an in-cabin sound field, which is applied to a sound control system of a target vehicle, the sound control system being configured with a plurality of loudspeakers that are installed at different positions in a cabin of the target vehicle, wherein the method for optimizing an in-cabin sound field comprises: obtaining, upon detecting that a warning object appears in a caution zone corresponding to the target vehicle, a relative position parameter between the warning object in the caution zone and the target vehicle, wherein the relative position parameter reflects an orientation attribute and a distance attribute between the warning object and the target vehicle;reconstructing a sound field in the cabin of the target vehicle based on the relative position parameter to obtain a corresponding target chime source file;and outputting a corresponding audio control signal to each of the loudspeakers based on the target chime source file, wherein the audio control signal imparts a corresponding acoustic property to a chime emitted by a corresponding one of the loudspeaker so as to create, in the target vehicle, a sound field which reflects position and movement direction of the warning object, wherein an indicator of the acoustic property includes at least one of phase, amplitude, and frequency. In a second aspect of the implementations of the disclosure, there is provided an apparatus for optimizing an in-cabin sound field, which is applied to a sound control system of a target vehicle, the sound control system being configured with a plurality of loudspeakers that are installed at different positions in a cabin of the target vehicle, wherein the apparatus for optimizing an in-cabin sound field comprises: a parameter obtaining module configured to obtain, upon detecting that a warning object appears in a caution zone corresponding to the target vehicle, a relative position parameter between the warning object in the caution zone and the target vehicle, wherein the relative position parameter reflects an orientation attribute and a distance attribute between the warning object and the target vehicle;a sound field reconstructing module configured to reconstruct a sound field in the cabin of the target vehicle based on the relative position parameter to obtain a corresponding target chime source file;and a signal outputting module configured to output a corresponding audio control signal to each of the loudspeakers based on the target chime source file, wherein the audio control signal imparts a corresponding acoustic property to a chime emitted by a corresponding one of the loudspeaker so as to create, in the target vehicle, a sound field which reflects position and movement direction of the warning object, wherein an indicator of the acoustic property includes at least one of phase, amplitude, and frequency. In a third aspect of the implementations of the disclosure, there is provided a sound control system, comprising: a memory, a processor, and a plurality of loudspeakers, wherein the loudspeakers are installed at diff