Speech processing device for radioelectric equipment adapted for

Details Speech processing device for radioelectric equipment adapted for Speech processing device for radioelectric equipment adapted for

1983-12-07

1985-12-31

Orsino, Jr., Joseph A.

Multiplex communications

Wide area network

Packet switching

370 6, 375122, 333 14, 1791702, 381110, H04B 320

Patent

active

045625719

ABSTRACT:
The device is of the type comprising a circuit for compressing the dynamic of the speech signal before transmission of the signal at constant level and an expander for re-establishing at reception the speech level before compression thereof. A logic filtering circuit controls the compression circuit by constant attenuation steps depending on the speech level. A selector comparator circuit coupled by a first input to an output of the logic filtering circuit and by a second input to the output of a device controlling the expander compares the attenuation values supplied by the logic filtering circuit with those supplied by the device controlling the expander and adjusts the attenuation value of the compression circuit to the greatest of the attenuation values supplied by the logic filtering circuit or by the control device of the expander.

REFERENCES:
patent: 3377559 (1968-04-01), Stewart
patent: 3462561 (1969-08-01), Deman
patent: 3885111 (1975-03-01), Ishigami et al.
patent: 4123711 (1978-10-01), Chow
patent: 4271499 (1981-06-01), Leveque

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