Title:
HOWLING SUPPRESSION DEVICE, PROGRAM, INTEGRATED CIRCUIT, AND HOWLING SUPPRESSION METHOD
Document Type and Number:
WIPO Patent Application WO/2005/125272
Kind Code:
A1
Abstract:
It is possible to suppress howling generated when amplifying a target sound collected by a first microphone, by an amplification unit and outputting it from a loud speaker as an intensified sound. The first step generates a first power spectrum corresponding to a first acoustic signal collected and outputted by the first microphone. The next step generates a second power spectrum corresponding to a second acoustic signal associated with a sound containing at least the intensified sound and not including the target sound. According to the first power spectrum and the second power spectrum, the first acoustic signal is filtered so that only the acoustic signal associated with the target sound is outputted to the amplification unit.
Inventors:
KANAMORI TAKEO
KAWAMURA TAKASHI
MATSUOKA TOMOMI
KAWAMURA TAKASHI
MATSUOKA TOMOMI
Application Number:
PCT/JP2005/010408
Publication Date:
December 29, 2005
Filing Date:
June 07, 2005
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
KANAMORI TAKEO
KAWAMURA TAKASHI
MATSUOKA TOMOMI
KANAMORI TAKEO
KAWAMURA TAKASHI
MATSUOKA TOMOMI
International Classes:
H04R3/02; H04R27/00; (IPC1-7): H04R3/02; H04R27/00
Domestic Patent References:
| WO2003010996A2 | 2003-02-06 |
Foreign References:
| JPH08223274A | 1996-08-30 | |||
| JP2003284183A | 2003-10-03 | |||
| JP2002237769A | 2002-08-23 | |||
| JP2002223182A | 2002-08-09 | |||
| JP2003250193A | 2003-09-05 |
Attorney, Agent or Firm:
Ogasawara, Shiro (3-11 Enokicho, Suita-sh, Osaka 53, JP)
Download PDF:
Previous Patent: AIRBORNE COLLECTION OF ACOUSTIC DATA USING AN UNMANNED AERIAL VEHICLE
Next Patent: HOWLING DETECTOR AND ITS METHOD
Next Patent: HOWLING DETECTOR AND ITS METHOD