Multifrequency receiver

Details Multifrequency receiver Multifrequency receiver

H - Electricity

04

Q

328/164, 340/166

H04Q 1/45 (2006.01) G01R 23/02 (2006.01) H04Q 1/453 (2006.01)

Patent

CA 1194939

- 17 - ABSTRACT MULTIFREQUENCY RECEIVER 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).

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