Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1983-03-28
1984-11-06
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455186, 455197, 455340, H04B 126
Patent
active
044816731
ABSTRACT:
A tuning system for a receiver includes an RF filter for selecting the RF signal corresponding to a selected channel of a plurality of channels in response to a filter tuning control signal, a local oscillator for developing an oscillator signal, the frequency of which is controlled by an oscillator tuning control signal developed in response to a binary coded representation of the channel number of the selected selection, and a mixer for heterodyning the selected RF signal with the local oscillator signal to produce an IF signal. A circuit including a memory is provided for storing binary signals for controlling the modification of the oscillator tuning control signal to derive the filter tuning control signal. Since the modification needed to derive the filter tuning control signal is the same for groups of channels, the number of memory locations is less than the total number of channels and the addresses are therefore generated by coupling means responsive to the coded channel signals for supplying only a predetermined number of bits of said coded channel number representative signal to the address inputs of the memory. Since the number of modifications needed from higher number channels is less than for lower number of channels, the coupling means ignores increasing numbers of least significant bits of the coded channel number representative signal for developing the address signals, as the channel number increases.
REFERENCES:
patent: 3835424 (1974-09-01), Marik
patent: 4334323 (1982-06-01), Moore
patent: 4402089 (1983-08-01), Knight et al.
patent: 4408348 (1983-10-01), Theriault
patent: 4418427 (1983-11-01), Muterspaugh
patent: 4418428 (1983-11-01), Evans
The Cheap Video Cookbook by Don Lancaster, Published by Howard W. Samms and Co. in 1978, pp.40 to 42.
Emanuel Peter M.
Ng Jin F.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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