Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-03-11
1982-09-28
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455186, H04B 126
Patent
active
043522068
ABSTRACT:
In a tuning system including a station selector for generating a digital word representative of a selected channel, a counter for counting periods of a local oscillator signal during a measurement interval to generate a digital word representing the accumulated count and a comparator for generating control signals for the local oscillator in accordance with the deviation between the station-representative and count-representative digital words, apparatus is provided to enable the number of bits in the count-representative digital word to be less than the number of bits in the station-representative digital word. Such an arrangement is therefore particularly useful when it is desired to incorporate a large portion of the tuning system in a relatively inexpensive microcomputer in which only a relatively small number of bits, e.g., 8, can be dynamically processed. Specifically, the tuning system operates in coarse, medium and fine tuning steps. During each step a predetermined group of bits derived from the station-representative digital word are selected for comparison and the duration of the measurement interval is set in accordance with the bits selected.
REFERENCES:
patent: 4053933 (1977-10-01), Collins
patent: 4110695 (1978-08-01), Klank et al.
patent: 4184121 (1980-01-01), Tanaka
Bookbinder Marc E.
Emanuel P. M.
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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