Digital channel selection and fine tuning system

Details Digital channel selection and fine tuning system Digital channel selection and fine tuning system

1979-08-10

1981-11-03

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455184, 455186, 455316, H04B 126

Patent

active

042989884

ABSTRACT:
A tuning system for use in a radio frequency multi-signal receiving system, e.g., for CATV converters, utilizes a closed feedback loop digital arrangement for channel selection (local oscillator frequency control) and channel fine tuning. The system may be implemented either via discrete hardware or through the use of microprocessor controlled apparatus.
In accordance with one aspect of the present invention, double heterodyne tuning apparatus automatically compensates for frequency drift in the second local oscillator.

REFERENCES:
patent: 3961266 (1976-06-01), Tanaka
patent: 4004232 (1977-01-01), Amaya
patent: 4061980 (1977-12-01), Sato
patent: 4114100 (1978-09-01), Klank
patent: 4144498 (1979-03-01), Tanaka

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