Automatic digital control device for exact frequency tuning of a

Details Automatic digital control device for exact frequency tuning of a Automatic digital control device for exact frequency tuning of a

1981-11-24

1983-12-06

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455169, H03J 722

Patent

active

044197675

ABSTRACT:
In a voltage synthesizer type receiver in which the tuning frequency is varied in first and second directions and in which a tuning frequency is automatically obtained in response to detuning detection signals produced from a window comparator, a hysteresis characteristic of the window comparator is compensated for by using a second up/down counter to control the tuning frequency variation in the second direction so that it terminates half way between the trailing edge of a first detection signal and the leading edge of a second detection signal so that exact tuning is accomplished.

REFERENCES:
patent: 4264976 (1981-04-01), Yamashita

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