Telephonic communications – Audio message storage – retrieval – or synthesis – Multilingual system or operation
Patent
1990-10-04
1994-02-22
Brown, Thomas W.
Telephonic communications
Audio message storage, retrieval, or synthesis
Multilingual system or operation
379395, 381106, H04M 160, H04M 165
Patent
active
052895297
ABSTRACT:
An automatic gain controller uses a voltage controlled amplifier coupled to an averaging circuit that feeds back into the amplifier. The averaging circuit supplies a controlling voltage that keeps the amplifier output voltage tending towards a certain reference level. When the amplifier output is generally high, the averaging circuit output is also generally high and the reverse is also true for low signals. For low averaging circuit output voltages corresponding to low intensity signals, amplification of the signal by the amplifier is enhanced or augmented. The result is to boost the signal of low intensity signals significantly, compressing the dynamic range of an incoming signal received from a phone. This reduces the variance of an incoming phone line signal for an analog to digital converter (ADC) in a digital telephone answering device, and the effective dynamic range of the ADC is closer to optimum. A scaling circuit couples the signal from the automatic gain controller to the ADC.
REFERENCES:
patent: 3745261 (1973-07-01), Friedman
patent: 4406923 (1983-09-01), Burne, III et al.
patent: 4506113 (1985-03-01), Blomley
patent: 4630302 (1986-12-01), Kryter
patent: 4794638 (1988-12-01), Millet
patent: 4928307 (1990-05-01), Lynn
"Audio compounder squelches hiss and hum better than Dolby system", Electronics, Feb. 15, 1979, pp. 70, 72.
Voice Technology, Teja and Gonnella, Reston Publishing Co., Inc., Reston, Va., 1983, pp. 26-31.
Brown Thomas W.
Phone-Mate, Inc.
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