Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-11-08
1978-04-18
Claffy, Kathleen H.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307310, H04M 356, H01L 2356
Patent
active
040852903
ABSTRACT:
A telephone conference amplifier consists of a plurality of identical channels connected to a common point. Each channel includes means for deriving an envelope signal from an incoming speech signal, and means for adding the envelope signal to the incoming signal to produce a unidirectional polarity signal which is applied through an ideal diode circuit to the common point. The signal at the common point is picked off by another ideal diode circuit in each channel and returned to the channel input. Each channel includes means for inhibiting the return of the signal when it is active. Each channel includes a level control circuit for controlling in dependence on the envelope signal the amplitude of the unidirectional polarity signal produced from an input signal so as to limit the range of variation. The sensitivity of the means for producing an envelope signal is responsive to the signal derived from the common point in such a way as to be reduced when the signal at the common point originates from another channel. The signal for reducing the sensitivity of the means for producing an envelope signal includes a transistor which is shunted by a temperature dependent resistor thereby to keep the reduction in sensitivity of the means for producing an envelope signal less dependent on temperature.
REFERENCES:
patent: 3299296 (1967-01-01), Bullene
patent: 3321581 (1967-05-01), Zyrd
patent: 3371231 (1968-02-01), Burley
patent: 3816917 (1974-06-01), Jones
patent: 3943286 (1976-03-01), Tsurushima
"Transistor Manual," General Electric Co., 1969, pp. 106-107.
Drew Allan Mathieson
Jones Ralph Archibald
Chayt Kenneth A.
Claffy Kathleen H.
Post Office
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