Mobile telephone set with automatic sound level control

Details Mobile telephone set with automatic sound level control Mobile telephone set with automatic sound level control

1997-05-27

2000-05-30

Chin, Wellington

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455572, 455575, 375312, H01S 400, H04L 2704

Patent

active

060700882

ABSTRACT:
In a portable telephone set having an audio-frequency amplifier (12) for amplifying a sound signal from a microphone (11) and a codec (13),for digitizing and coding the sound signal into a digital sound signal which is transmitted therefrom, a level of said sound signal is monitored (17) to produce a detected level and is averaged at a timing (18) and compared with level data stored in a memory (15), and an amplification control signal is produced. At least one of the audio-amplifier (12) and said codec (13) is controlled its amplification degree in response to the amplification control signal.

REFERENCES:
patent: 3808540 (1974-04-01), Kabrick
patent: 5390244 (1995-02-01), Hinman et al.
patent: 5404315 (1995-04-01), Nakano et al.
patent: 5471527 (1995-11-01), Ho et al.
patent: 5526407 (1996-06-01), Russell et al.
patent: 5602913 (1997-02-01), Lee et al.
patent: 5734987 (1998-03-01), Shiono et al.
patent: 5812944 (1998-09-01), Matsumoto

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