Multifrequency receiver

Details Multifrequency receiver Multifrequency receiver

1981-04-15

1983-05-24

Rubinson, G. Z.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 77E, H04M 150

Patent

active

043852084

ABSTRACT:
In a multifrequency receiver, a threshold level (VTH) supplied to a group of threshold comparators (105-1 through 105-N) is controllably adjustable by a variable threshold generation circuit (104) in response to received multifrequency signals. As the envelope of the received multifrequency signal experiences a positive amplitude transition, the threshold level is increased at a fast rate (fast attack). Also, as the envelope of the received multifrequency signal exhibits a negative amplitude transition, the threshold level is decreased at a much slower rate (slow release).

REFERENCES:
patent: 4107475 (1978-08-01), Carlqvist et al.
patent: 4121121 (1978-10-01), Gabeler
patent: 4145580 (1979-03-01), Hasegawa
patent: 4227055 (1980-10-01), Hanson

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