# US 2020/0288261 A1 · Audio processing device and method therefor

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- Number: US 2020/0288261 A1
- Document ID: US20200288261A1
- Status: Published application
- Kind: A1
- Application number: 16/883,004
- Filed: 2020-05-26
- Published: 2020-09-10
- Earliest claimed: 2014-01-16
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: MINORU TSUJI; TORU CHINEN
- Web page: https://patentgrep.com/patent/US20200288261A1

## CPC

- H04S 7/302: {Electronic adaptation of stereophonic sound system to listener position or orientation (H04S7/301 takes precedence)}
- H04S 3/008: {in which the audio signals are in digital form, i.e. employing more than two discrete digital channels (data reduction aspects thereof based on psychoacoustics G10L19/02)}
- H04S 7/307: {Frequency adjustment, e.g. tone control (H04S7/301 takes precedence)}
- H04R 1/40: by combining a number of identical transducers {(specially adapted for hearing aids H04R25/405)}
- H04S 2400/01: Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
- H04S 2400/11: Positioning of individual sound objects, e.g. moving airplane, within a sound field (H04S2420/13 takes precedence)
- H04S 2400/13: Aspects of volume control, not necessarily automatic, in stereophonic sound systems
- H04S 2420/03: Application of parametric coding in stereophonic audio 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)

## Abstract

An input unit receives input of an assumed listening position of sound of an object, which is a sound source, and outputs assumed listening position information indicating the assumed listening position. A position information correction unit corrects position information of each object on the basis of the assumed listening position information to obtain corrected position information. A gain/frequency characteristic correction unit performs gain correction and frequency characteristic correction on a waveform signal of an object on the basis of the position information and the corrected position information. A spatial acoustic characteristic addition unit further adds a spatial acoustic characteristic to the waveform signal resulting from the gain correction and the frequency characteristic correction on the basis of the position information of the object and the assumed listening position information. The present technology is applicable to an audio processing device.

## Claims

### Claim 1

An audio processing device, comprising:
a position information correction unit configured to calculate, based on position information and listening position information, corrected position information that indicates a first position of a sound source relative to a listening position indicated by the listening position information, wherein
the position information indicates a second position of the sound source relative to a standard listening position at which sound from the sound source is heard, and
the listening position is different from the standard listening position at which the sound from the sound source is heard;
a correction unit configured to correct a frequency characteristic of a waveform signal of the sound source based on the position information and the corrected position information, wherein
a high frequency component of the sound source is attenuated based on a first distance that is greater than a second distance,
the first distance is a distance between the listening position and the sound source, and
the second distance is a distance between the standard listening position and the sound source; and
a generation unit configured to generate, based on the corrected frequency characteristic of the waveform signal of the sound source and the corrected position information, a reproduction signal for reproduction of the sound from the sound source to be heard at the listening position.

### Claim 2 (depends on 1)

The audio processing device according to claim 1, further comprising a spatial acoustic characteristic addition unit configured to add a spatial acoustic characteristic to the waveform signal of the sound source based on the listening position information and the position information.

### Claim 3 (depends on 2)

The audio processing device according to claim 2, wherein the spatial acoustic characteristic addition unit is further configured to add at least one of early reflection or a reverberation characteristic as the spatial acoustic characteristic to the waveform signal of the sound source.

### Claim 4 (depends on 1)

The audio processing device according to claim 1, wherein
the position information is expressed by coordinates of an orthogonal coordinate system, and
the orthogonal coordinate system has an origin at the standard listening position.

### Claim 5

An audio processing method, comprising:
in an audio processing device:
calculating, based on position information and listening position information, corrected position information that indicates a first position of a sound source relative to a listening position indicated by the listening position information, wherein
the position information indicates a second position of the sound source relative to a standard listening position at which sound from the sound source is heard, and
the listening position is different from the standard listening position at which the sound from the sound source is heard;
correcting a frequency characteristic of a waveform signal of the sound source based on the position information and the corrected position information, wherein
a high frequency component of the sound source is attenuated based on a first distance that is greater than a second distance,
the first distance is a distance between the listening position and the sound source, and
the second distance is a distance between the standard listening position and the sound source; and
generating, based on the corrected frequency characteristic of the waveform signal of the sound source and the corrected position information, a reproduction signal for reproduction of the sound from the sound source to be heard at the listening position.

### Claim 6 (depends on 5)

The audio processing method according to claim 5, further comprising adding a spatial acoustic characteristic to the waveform signal of the sound source based on the listening position information and the position information.

### Claim 7 (depends on 6)

The audio processing method according to claim 6, further comprising adding at least one of early reflection or a reverberation characteristic as the spatial acoustic characteristic to the waveform signal of the sound source.

### Claim 8 (depends on 5)

The audio processing method according to claim 5, wherein
the position information is expressed by coordinates of an orthogonal coordinate system, and
the orthogonal coordinate system has an origin at the standard listening position.

### Claim 9

A non-transitory computer-readable medium having stored thereon computer-executable instructions that, when executed by a processor, cause the processor to execute operations, the operations comprising:
calculating, based on position information and listening position information, corrected position information that indicates a first position of a sound source relative to a listening position indicated by the listening position information, wherein
the position information indicates a second position of the sound source relative to a standard listening position at which sound from the sound source is heard, and
the listening position is different from the standard listening position at which the sound from the sound source is heard;
correcting a frequency characteristic of a waveform signal of the sound source based on the position information and the corrected position information, wherein
a high frequency component of the sound source is attenuated based on a first distance that is greater than a second distance,
the first distance is a distance between the listening position and the sound source, and
the second distance is a distance between the standard listening position and the sound source; and
generating, based on the corrected frequency characteristic of the waveform signal of the sound source and the corrected position information, a reproduction signal for reproduction of the sound from the sound source to be heard at the listening position.

### Claim 10 (depends on 9)

The non-transitory computer-readable medium according to claim 9, further comprising adding a spatial acoustic characteristic to the waveform signal of the sound source based on the listening position information and the position information.

### Claim 11 (depends on 10)

The non-transitory computer-readable medium according to claim 10, further comprising adding at least one of early reflection or a reverberation characteristic as the spatial acoustic characteristic to the waveform signal of the sound source.

### Claim 12 (depends on 9)

The non-transitory computer-readable medium according to claim 9, wherein
the position information is expressed by coordinates of an orthogonal coordinate system, and
the orthogonal coordinate system has an origin at the standard listening position.