Title:
HOWLING DETECTOR AND ITS METHOD
Document Type and Number:
WIPO Patent Application WO/2005/125273
Kind Code:
A1
Abstract:
A howling detector detects, for each speech signal, the domination ratio indicating the degree of danger of causing howling when a mixed signal generated by mixing speech signals collected by microphones by means of a sound mixing unit is converted into sound by means of a loudspeaker. The howling detector comprises a level detecting unit for detecting the levels of the speech signals, a desinence detecting unit which compares in time series a noise reference signal which is a signal concerning the sound produced by the loudspeaker with the mixed signal and detects a desinence section, i.e., the time when the mixed signal is inputted after the noise reference signal falls, and domination ratio calculating unit which extracts only the levels corresponding to the desinence sections out of the levels of the speech signals detected by the level detecting unit and calculates the ratios of the levels of the speech signals to the sum of the levels of the speech signals as their domination ratios.
Inventors:
KAWAMURA TAKASHI
KANAMORI TAKEO
KANAMORI TAKEO
Application Number:
PCT/JP2005/010959
Publication Date:
December 29, 2005
Filing Date:
June 15, 2005
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
KAWAMURA TAKASHI
KANAMORI TAKEO
KAWAMURA TAKASHI
KANAMORI TAKEO
International Classes:
H04R3/00; H04R3/02; (IPC1-7): H04R3/02; H04R3/00
Foreign References:
| JPH08223274A | 1996-08-30 | |||
| JP2003284183A | 2003-10-03 | |||
| JPH0833091A | 1996-02-02 | |||
| 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)
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