Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-03-22
1977-12-27
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307230, 307351, 324103P, 324132, 328 26, 328145, 328151, H02M 700, G06G 724, G01R 1904
Patent
active
040656829
ABSTRACT:
A system for deriving a voltage which is a logarithmic function of peak value of an audio signal, in which the audio input signal is amplified by means of an operational amplifier having bipolar feedbacks through a pair of oppositely poled rectifying junction devices operating over logarithmic portions of their response characteristics, the output of the operational amplifier being applied in opposite polarities to a second pair of rectifying junction devices to rectify a bipolar signal applied thereto, and to control current flow to a storage capacitor, the second pair of devices having a common load which provides a constant current source for slow charge of the storage capacitor in one sense, the second pair of devices providing rapid discharge paths in the opposite sense. In one embodiment either or both pairs of rectifying junction devices can be transistors. Improved operation occurs with transistors in that they exhibit gain as well as rectifying characteristics which increases the range of the inventive circuit.
REFERENCES:
patent: 3099000 (1963-07-01), Dunning
patent: 3201688 (1965-08-01), Ferguson
patent: 3289079 (1966-11-01), Ferguson
patent: 3499160 (1970-03-01), Gordon
patent: 3971984 (1976-07-01), Bench
McIntosh Laboratory Inc.
Zazworsky John
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