Title:
音声通信装置
Document Type and Number:
Japanese Patent JP4282317
Kind Code:
B2
Abstract:
A transmission-speech extraction filter extracts speech to be transmitted from the output signal of a transmission-speech microphone by using the proximity effect. A background-sound extraction filter extracts background sound from the output signal of the transmission-speech microphone. A background sound level calculation section calculates the level of the extracted background sound in each frequency band, and sends the level to a loudness-compensation control section as a background-sound level. The loudness-compensation control section controls the amount of gain adjustment for a received-speech signal in each frequency band in a gain adjustment section according to the background-sound level and the received-speech level of a received-speech signal, calculated in a received-speech-level calculation section.
Inventors:
Nozomi Saito
Toru Marumoto
Toru Marumoto
Application Number:
JP2002354164A
Publication Date:
June 17, 2009
Filing Date:
December 05, 2002
Export Citation:
Assignee:
Alpine Electronics Co., Ltd.
International Classes:
H04M1/60; H04R3/00; G10L21/02; H03G3/32; H03G5/16; H03G5/22; H03G9/02
Domestic Patent References:
| JP11308329A | ||||
| JP2000506347A | ||||
| JP2000069127A | ||||
| JP4181897A | ||||
| JP6152724A | ||||
| JP2000312396A | ||||
| JP2001136039A |
Attorney, Agent or Firm:
Katsushi Sato