Circuitry in a scanning receiver for speeding up the generation

Details Circuitry in a scanning receiver for speeding up the generation Circuitry in a scanning receiver for speeding up the generation

1985-11-15

1988-03-15

Masinick, Michael A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455222, 455226, 455296, H04B 110

Patent

active

047318686

ABSTRACT:
Reception or non-reception of a signal is detected on the basis of whether or not a certain noise level is reached at the receiver output. Measuring periods are formed, during each of which the charge of a capacitor changes from a fixed value to a value dependent upon the momentary noise. The time from the beginning of the measuring period until a certain state of charge is reached is compared with a reference time, and a receive criterion is produced when the time dependent upon the noise is shorter than the reference time. The reference time may be obtained in a manner similar to the way in which the first-mentioned time is produced. When both times are thus obtained in an analogous manner, not only the presence but also the absence of a signal can be detected much more rapidly than heretofore.

REFERENCES:
patent: 3961268 (1976-06-01), Hansen
patent: 4378605 (1983-03-01), Baumann et al.
patent: 4498195 (1985-02-01), Ooi et al.

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