Telephone having automatic gain control means

Details Telephone having automatic gain control means Telephone having automatic gain control means

1997-10-08

2000-07-25

Isen, Forester W.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379387, 379389, 381104, 381107, H04M 164, H03G 300

Patent

active

060944811

ABSTRACT:
A telephone is disclosed having an automatic gain control circuit and a processor which separates a local signal into a sound signal and a speech signal. The automatic gain control circuit selects a gain value based on sound levels of the sound signal when the speech signal indicates an absence of speech. The telephone also has a variable gain amplifier to amplify a received signal. The gain of the amplifier is selected from stored gain values which are stored in a memory of the telephone in a table format and are a function of the sound signal and volume levels of the sound signal chosen by a user. An input device of the telephone allows the user to select one of the volume levels.

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