# US 12,003,947 B2 · Sound field optimization method and device performing same

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- Number: US 12,003,947 B2
- Document ID: US12003947B2
- Status: Granted
- Kind: B2
- Application number: 17/880,704
- Filed: 2022-08-04
- Published: 2023-06-29
- Granted: 2024-06-04
- Earliest claimed: 2021-12-29
- Assignees: AAC Microtech (Changzhou) Co., Ltd.
- Applicants: AAC Microtech (Changzhou) Co., Ltd.
- Inventors: Shuyuan Sun; Yiming Meng; Hao Yin
- Web page: https://patentgrep.com/patent/US12003947B2

## CPC

- H04S 7/302: {Electronic adaptation of stereophonic sound system to listener position or orientation (H04S7/301 takes precedence)}
- H04R 5/02: Spatial or constructional arrangements of loudspeakers
- H04S 7/301: {Automatic calibration of stereophonic sound system, e.g. with test microphone}
- H04R 2430/20: Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic (H04R2203/12 takes precedence)
- H04R 2499/13: Acoustic transducers and sound field adaptation in vehicles
- Y02T 10/40: Engine management systems
- H04S: STEREOPHONIC SYSTEMS
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The invention provides a sound field optimization method, including steps of building up a first acoustic response model for a controlled area inside a car and building up a second acoustic response model for an uncontrolled area inside the car; building up a first acoustic response difference calculation model based on the first acoustic response model and the second acoustic response model; calculating optimal solution of audio parameters; and controlling each speaker to output audio signals according to corresponding optimal solution of audio parameters. Thus, the vocal area isolation is achieved, so as to provide more extreme acoustic hearing, sound field effect in the controlled area where the user is located inside the car is optimized.

## Claims

### Claim 1

A sound field optimization method used in an intelligent cockpit audio system having a first speaker mounted at a back of a front seat and a second speaker mounted on a headrest of a rear sea, the sound field optimization method comprising steps of:
building up a first acoustic response model based on audio parameters, an acoustic response transfer function and a first acoustic transfer function corresponding to a reference position inside a controlled area to be calculated for each speaker, the controlled area being a division of a rear seat currently taken by a rear passenger;
building up a second acoustic response model based on the audio parameters, the acoustic response transfer function and a second acoustic transfer function corresponding to the reference position inside an uncontrolled area to be calculated; the uncontrolled area being a division of a rear seat currently not taken by a rear passenger;
building up a first acoustic response difference calculation model based on the first acoustic response model and the second acoustic response model;
calculating optimal solution of audio parameters corresponding to the audio parameters to be calculated for each of the speakers with maximization of acoustic response difference between the controlled area and the uncontrolled area as constraint condition for the first acoustic response difference calculation model;
controlling each of the speakers to output audio signals according to the corresponding audio parameters.

### Claim 2 (depends on 1)

The sound field optimization method as described in claim 1, wherein the steps of building up the first acoustic response model based on the audio parameters, the acoustic response transfer function and the first acoustic transfer function corresponding to the reference position inside the controlled area, to be calculated for each speaker, comprises step of:
building up the first acoustic response model based on the audio parameters, the acoustic response transfer function and the first acoustic transfer function at ear positions on different sides of the rear passenger inside the controlled area, to be calculated for each speaker.

### Claim 3 (depends on 2)

The sound field optimization method as described in claim 2, wherein before the steps of calculating the optimal solution of the audio parameters corresponding to the audio parameters to be calculated for each of the speakers with the maximization of acoustic response difference between the controlled area and the uncontrolled area as constraint condition for the first acoustic response difference calculation model, further comprises steps of:
building up a third acoustic response model respectively based on the analog audio parameters, the acoustic response transfer function of the virtual speakers arranged oppositely at the ear positions on different sides of the rear passenger and a third acoustic transfer function corresponding to the ear position on corresponding side;
building up a second acoustic response difference calculation model based on the first acoustic response model and the third acoustic response model; and wherein
the steps of calculating the optimal solution of audio parameters corresponding to the audio parameters to be calculated for each of the speakers with the maximization of acoustic response difference between the controlled area and the uncontrolled area as constraint condition for the first acoustic response difference calculation model comprises step of:
calculating optimal solution of the audio parameters to be calculated for each of the speakers jointly with the maximization of acoustic response difference between the controlled area and the uncontrolled area as constraint condition for the first acoustic response difference calculation model and with the minimization of the difference between the actual acoustic response and the analog acoustic response as constraint condition for the second acoustic response difference calculation model.

### Claim 4 (depends on 1)

The sound field optimization method as described in claim 1, wherein the first speaker is a speaker array group having speaker arrays arranged at different positions.

### Claim 5

A sound field optimization device used in an intelligent cockpit audio system having a first speaker and a second speaker respectively arranged on a front seat and a rear seat on the same side, the first speaker being arranged at a back of the front seat, the second speaker being arranged at a rear seat headrest, the sound field optimization device comprising:
a first building block, used for building up a first acoustic response model based on audio parameters, an acoustic response transfer function and a first acoustic transfer function corresponding to a reference position inside a controlled area, to be calculated for each speaker, and building up a second acoustic response model based on the audio parameters, the acoustic response transfer function and a second acoustic transfer function corresponding to the reference position inside an uncontrolled area, to be calculated; wherein, the controlled area is a division of rear seats currently taken by the rear passenger, the uncontrolled area is a division of rear seats currently not taken by the rear passenger;
a second building block, used for building up a first acoustic response difference calculation model based on the first acoustic response model and the second acoustic response model;
a calculation module, used for calculating optimal solution of the audio parameters corresponding to the audio parameters to be calculated for each of the speakers with the maximization of acoustic response difference between the controlled area and the uncontrolled area as constraint condition for the first acoustic response difference calculation model;
a control module, used for control each of the speakers to output audio signals according to the corresponding audio parameters.

### Claim 6 (depends on 5)

The sound field optimization device as described in claim 5, wherein the first building block is specifically used for building up the first acoustic response model respectively based on the audio parameters, the acoustic response transfer function and the first acoustic transfer function at the ear positions on different sides of the rear passenger inside the controlled area.

### Claim 7 (depends on 6)

The sound field optimization device as described in claim 6, wherein the first building block is further used for building up the third acoustic response model respectively based on the analog audio parameters, the acoustic response transfer function of the virtual speakers arranged oppositely at the ear positions on different sides of the rear passenger and the third acoustic transfer function corresponding to the ear position on corresponding side;
the second building block is further used for building up the second acoustic response difference calculation model based on the first acoustic response model and the third acoustic response model;
the calculation module is specifically used for calculating the optimal solution of the audio parameters corresponding to the audio parameters to be calculated for each of the speakers jointly with the maximization of acoustic response difference between the controlled area and the uncontrolled area as constraint condition for the first acoustic response difference calculation model and with the minimization of the difference between the actual acoustic response and the analog acoustic response as constraint condition for the second acoustic response difference calculation model.

### Claim 8 (depends on 5)

The sound field optimization device as described in claim 5, wherein the first speaker is a speaker array group having speaker arrays arranged at different positions.