Signal compression circuit, particularly for a telephone set

Details Signal compression circuit, particularly for a telephone set Signal compression circuit, particularly for a telephone set

1988-07-19

1990-01-16

Schreyer, Stafford D.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379395, 330290, H04M 908

Patent

active

048948624

ABSTRACT:
The Invention relates to a signal compression circuit, more particularly for a telephone set of the handsfree-type, comprising a preamplifier (10), the input of which is connected with an input signal to be processed, and a preamplifier gain control device (11) for servo-controlling, to a predetermined value, the output signal amplitude of the preamplifier, in which the gain control device (11) is associated with a circuit (C, 15, 16) determining two time constants, which respectively control the increase or decrease speed of the preamplifier gain (10) in relation with the input signal amplitude (Vin).

REFERENCES:
patent: 3602648 (1969-12-01), Holtz
patent: 3919654 (1975-11-01), Toumani
patent: 4322636 (1982-03-01), Schroder
"CX and DNR", Elektor (Feb. 1982) Search Report.

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