Circuits for detecting trigger signals for use in synthesizing

Details Circuits for detecting trigger signals for use in synthesizing Circuits for detecting trigger signals for use in synthesizing

1974-09-16

1976-04-13

Safourek, Benedict V.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

325470, 307295, H04B 132

Patent

active

039507025

ABSTRACT:
A trigger signal for indicating the receiving point of a synthesizing type high frequency receiver including a voltage controlled oscillator is detected by a circuit comprising means for deriving an intermediate frequency signal from the received high frequency signal, a wave shaper for shaping the waveform of the intermediate frequency signal, a first monostable circuit connected to the output of the wave shaper and having a time constant larger than the width of the output but smaller than the minimum frequency spacing between individual stations, a second monostable circuit connected to the output of the first monostable circuit and having a time constant smaller than the width of the output of the wave shaper, and an AND gate circuit for producing a logical product of the output of the second monostable circuit and a sweeping clock signal.

REFERENCES:
patent: 3466550 (1969-09-01), Wolf et al.
patent: 3482166 (1969-12-01), Gleason

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