Telephonic communications – Substation or terminal circuitry – Amplifying
Patent
1990-03-12
1991-12-03
Dwyer, James L.
Telephonic communications
Substation or terminal circuitry
Amplifying
379388, 379390, 381 72, 381104, 381106, H04M 160, H03G 320
Patent
active
050705270
ABSTRACT:
An audio compression system wherein the compression theshold may be adjusted to a calibrated level. The audio compression system is utilizable in a receiver system whereinan audio input signal received by the receiver system via a communications channel is applied to conditioning circuitry. The conditioning circuitry, in turn, provides a conditioned input signal to an acoustic transducer element for generating a corresponding audio output signal. The audio compression system compares the conditioned input signal and an initial threshold signal to provide a comparator output signal corresponding to the difference between the conditoned input signal and the initial threshold signal. The comparator output signal is provided as a control input to the conditioning circuitry. If the conditioned input signal exceeds the initial threshold signal for a preselected period of time, then the initial threshold signal is switched to a second threshold signal.
REFERENCES:
patent: 4112384 (1984-09-01), Buchberger
patent: 4386236 (1983-05-01), Ferrieu et al.
patent: 4466119 (1984-08-01), Peters et al.
patent: 4536888 (1985-08-01), Wilson
patent: 4718099 (1988-01-01), Hotvet
ACS Communications, Inc.
Dwyer James L.
Shehata Magdy W.
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