Dynamic threshold tone detector

Details Dynamic threshold tone detector Dynamic threshold tone detector

1976-07-30

1979-11-20

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307358, 329179, 340171R, H03K 520

Patent

active

041752562

ABSTRACT:
The presence of a tone in a received signal is detected by passing the signal through a bandpass filter tuned to the frequency of interest. The output from the filter is peak detected and applied both to the first input of a comparator and to a unique variable threshold circuit which, in turn, is coupled to the remaining comparator input. The threshold circuit tracks the peak detected level of the bandpass filter output such that the comparator is activated between its logic states, representing the detect or undetect condition, with a minimum of delay time.

REFERENCES:
patent: 2952811 (1960-09-01), Carr
patent: 3320576 (1967-05-01), Dixon et al.
patent: 3502993 (1970-03-01), Schurzinger et al.
patent: 3551889 (1970-12-01), Miller
patent: 3708678 (1973-01-01), Kreda
patent: 3868639 (1975-02-01), Okada et al.
patent: 3882402 (1975-05-01), Tajima et al.
Dynamic Threshold Circuit by Rackl, IBM Tech. Disclosure Bull., vol. 15, No. 4, Sep. 1972, p. 1138.

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