Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-10-16
1980-07-08
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328138, 307246, 307293, H03K 906, H03K 1728
Patent
active
042119383
ABSTRACT:
A tone detector comprising a non-linear or saturated system that is adapted to receive an input frequency or group of frequencies and to provide an output in the form of turn-on and turn-off signals which are independent of the amplitude of the input, the turn-on and turn-off signals being determined by the presence or absence of a particular frequency or group of frequencies; the system including a transistor connected to a biasing network that is DC referenced to a supply voltage potential of the collector of the transistor and AC referenced to the emitter of the transistor, and a filter connected to the transistor, the filter being substitutable by an input coupling capacitor to determine the presence or absence of the particular frequency or frequencies.
REFERENCES:
patent: 2969468 (1961-01-01), Hogue
patent: 3173065 (1965-03-01), Fullerton
patent: 3204190 (1965-08-01), Broadhead
Benjamin, Jr. Joel M.
Bolgiano Duane R.
Meyer, Jr. Victor
Heyman John S.
International Mobile Machines Incorporated
Jacobs Arthur A.
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