AUDIO SIGNAL PROCESSING APPARATUS AND AUDIO SIGNAL PROCESSING METHOD

• US 20110299706A1
• Filed: 05/19/2011
• Published: 12/08/2011
• Est. Priority Date: 06/07/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: SAKAI, Kazuki
• Granted Patent: US 8,494,190 B2
• Time in Patent Office: Days
• US Class Current: 381/303
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone

Abstract

An audio signal processing apparatus includes: a test signal supply unit to supply a test signal to each speaker of a multi-channel speaker including a center speaker and others; a speaker angle calculation unit to calculate an installation angle of each speaker with an orientation of a microphone as a reference, based on test audio output from each speaker and collected by the microphone; a speaker angle determination unit to determine an installation angle of each speaker with a direction of the center speaker from the microphone as a reference, based on the installation angle of the center speaker and the installation angles of the other speakers with the orientation of the microphone as a reference; and a signal processing unit to perform correction processing on an audio signal based on the installation angles of the speakers with the direction of the center speaker from the microphone as a reference.

Claims

1. An audio signal processing apparatus, comprising:

a test signal supply unit configured to supply a test signal to each of speakers of a multi-channel speaker including a center speaker and other speakers;

a speaker angle calculation unit configured to calculate an installation angle of each of the speakers of the multi-channel speaker with an orientation of a microphone as a reference, based on test audio output from each of the speakers of the multi-channel speaker by the test signals and collected by the microphone arranged at a listening position;

a speaker angle determination unit configured to determine an installation angle of each of the speakers of the multi-channel speaker with a direction of the center speaker from the microphone as a reference, based on the installation angle of the center speaker with the orientation of the microphone as a reference and the installation angles of the other speakers with the orientation of the microphone as a reference; and

a signal processing unit configured to perform correction processing on an audio signal based on the installation angles of the speakers of the multi-channel speaker with the direction of the center speaker from the microphone as a reference, the installation angles being determined by the speaker angle determination unit.

2. The audio signal processing apparatus according to claim 1, wherein

the signal processing unit distributes the audio signal supplied to one of the speakers of the multi-channel speaker to speakers adjacent to the speaker such that a sound image is localized at a specific installation angle with the direction of the center speaker from the microphone as a reference.

3. The audio signal processing apparatus according to claim 2, wherein

the signal processing unit delays the audio signal such that a reaching time of the test audio to the microphone becomes equal between the speakers of the multi-channel speaker.

4. The audio signal processing apparatus according to claim 2, wherein

the signal processing unit performs filter processing on the audio signal such that a frequency characteristic of the test audio becomes equal between the speakers of the multi-channel speaker.

5. An audio signal processing method, comprising:

supplying a test signal to each of speakers of a multi-channel speaker including a center speaker and other speakers;

calculating an installation angle of each of the speakers of the multi-channel speaker with an orientation of a microphone as a reference, based on test audio output from each of the speakers of the multi-channel speaker by the test signals and collected by the microphone arranged at a listening position;

determining an installation angle of each of the speakers of the multi-channel speaker with a direction of the center speaker from the microphone as a reference, based on the installation angle of the center speaker with the orientation of the microphone as a reference and the installation angles of the other speakers with the orientation of the microphone as a reference; and

performing correction processing on an audio signal based on the installation angles of the speakers of the multi-channel speaker with the direction of the center speaker from the microphone as a reference, the installation angles being determined by a speaker angle determination unit.