Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent
1995-12-06
1999-04-20
Tsang, Fan S.
Telephonic communications
Substation or terminal circuitry
Conversion of signal form
379387, 379388, 379389, 379390, 379391, 379392, 381 57, 381 94, H04M 100, H03G 320, H04B 1500
Patent
active
058964509
ABSTRACT:
In an apparatus of adjusting a sound level of a reception voice in a telephone, an audio signal including a transmission voice signal and a peripheral noise is inputted through a microphone. A gain control signal corresponding to a level of the peripheral noise is generated while the transmission voice signal is not present and the gain control signal immediately before input of the transmission voice signal is started is held and outputted while the transmission voice signal is present. A variable gain amplifier amplifies a reception voice signal in accordance with the gain control signal such that a voice corresponding to the reception voice signal is outputted from a speaker with a sound level determined in accordance with the gain control signal.
REFERENCES:
patent: 4829565 (1989-05-01), Goldberg
patent: 4847897 (1989-07-01), Means
patent: 4891837 (1990-01-01), Walker et al.
patent: 4908855 (1990-03-01), Ohga et al.
patent: 5297198 (1994-03-01), Butani et al.
patent: 5640450 (1997-06-01), Watanabe
Hoosain Allan
NEC Corporation
Tsang Fan S.
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