AUDIO SIGNAL PROCESSING DEVICE, AUDIO SIGNAL PROCESSING METHOD, AND PROGRAM

• US 20120106763A1
• Filed: 10/21/2011
• Published: 05/03/2012
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: OKIMOTO, Koyuru, Yamada, Yuji
• Granted Patent: US 9,084,069 B2
• Time in Patent Office: Days
• US Class Current: 381/333
• CPC Class Codes: H04R 2499/13 Acoustic transducers and sound field adaptation in vehicles
• CPC Class Codes: H04R 2499/15 Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone
• CPC Class Codes: H04S 7/302 Electronic adaptation of stereophonic sound system to listener position or orientation H04S7/301 takes precedence
• CPC Class Codes: H04S 7/305 Electronic adaptation of stereophonic audio signals to reverberation of the listening space H04S7/301 takes precedence

Abstract

An audio signal processing device includes two audio signal processing units that serially perform a processing with respect to an input audio signal, and obtain an output audio signal for driving a speaker. One audio signal processing unit of the two audio signal processing units performs, with respect to the input audio signal, a correction process through a filter that realizes a reverse characteristic of an impulse response measured at a first measurement position that is a front position of the speaker. The other audio signal processing unit performs, with respect to the input audio signal, a correction process through a filter that realizes a reverse characteristic of an impulse response measured at a second measurement position different from the first measurement position that is a front position of the speaker.

Claims

1. An audio signal processing device comprising:

two audio signal processing units that serially perform a processing with respect to an input audio signal, and obtain an output audio signal for driving a speaker,

wherein one audio signal processing unit of the two audio signal processing units performs, with respect to the input audio signal, a correction process through a filter that realizes a reverse characteristic of an impulse response measured at a first measurement position that is a front position of the speaker, and

the other audio signal processing unit performs, with respect to the input audio signal, a correction process through a filter that realizes a reverse characteristic of an impulse response measured at a second measurement position different from the first measurement position that is a front position of the speaker.

2. The audio signal processing device according to claim 1, further comprising:

a filter coefficient group retaining unit that retains a plurality of filter coefficient groups as a filter coefficient group of the filter of the other audio signal processing unit;

a filter coefficient group selecting unit that selects an arbitrary filter coefficient group among the plurality of filter coefficient groups retained in the filter coefficient group retaining unit; and

a filter coefficient setting unit that sets the filter coefficient group selected in the filter coefficient group selecting unit to the filter of the other audio signal processing unit.

3. The audio signal processing device according to claim 2,

wherein the plurality of filter coefficient groups retained in the filter coefficient group retaining unit is a plurality of filter coefficient groups corresponding to an installation state of the speaker.

4. The audio signal processing device according to claim 2,

wherein the plurality of filter coefficient groups retained in the filter coefficient group retaining unit is a plurality of filter coefficient groups corresponding to a listening position.

5. The audio signal processing device according to claim 1,

wherein the speaker is disposed integrally with a display panel that performs a video display, and

the audio signal processing device further comprises:

a filter coefficient group retaining unit that retains a plurality of filter coefficient groups corresponding to an installation angle of the display panel as the filter coefficient group of the other audio signal processing unit;

an installation angle detecting unit that detects the installation angle of the display panel; and

a filter coefficient setting unit that fetches the filter coefficient group corresponding to the installation angle of the display panel from the plurality of filter coefficient groups that is retained in the filter coefficient group retaining unit, based on a detection output of the installation angle detecting unit, and sets the fetched filter coefficient group to the filter of the other audio signal processing unit.

6. The audio signal processing device according to claim 5,

wherein as the installation angle of the display panel, there are two installation angles in a case where the display panel is disposed with a horizontal displacement and in a case where the display panel is disposed with a vertical displacement.

7. The audio signal processing device according to claim 1, further comprising:

an impulse response measuring unit that measures the impulse response at the second measurement position;

a filter coefficient group calculating unit that calculates the filter coefficient group of the filter that realizes a reverse characteristic of the impulse response measured in the impulse response measuring unit; and

a filter coefficient setting unit that sets the filter coefficient group calculated in the filter coefficient group calculating unit to the filter of the other audio signal processing unit.

8. An audio signal processing method, comprising:

two audio signal processing steps of serially performing a processing with respect to an input audio signal and obtaining an output audio signal for driving a speaker,

wherein in one audio signal processing step of the two audio signal processing steps, a correction process is performed with respect to the input audio signal through a filter that realizes a reverse characteristic of an impulse response measured at a first measurement position that is a front position of the speaker, and

in the other audio signal processing step, a correction process is performed with respect to the input audio signal through a filter that realizes a reverse characteristic of an impulse response measured at a second measurement position different from the first measurement position that is a front position of the speaker.

9. A program that allows a computer to function, as two audio signal processing units that serially perform a processing with respect to an input audio signal and obtain an output audio signal for driving a speaker,

wherein one audio signal processing unit of the two audio signal processing units performs, with respect to the input audio signal, a correction process through a filter that realizes a reverse characteristic of an impulse response measured at a first measurement position that is a front position of the speaker, and

the other audio signal processing unit performs, with respect to the input audio signal, a correction process through a filter that realizes a reverse characteristic of an impulse response measured at a second measurement position different from the first measurement position that is a front position of the speaker.