Channel identification apparatus useful in a sweep type tuning s

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency

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455164, 455169, 455182, 455184, 455186, 3581921, 3581931, H04B 116, H03J 718, H04N 550

Patent

active

043172253

ABSTRACT:
In a tuning system for generating a tuning voltage for tuning a television receiver, channel identification apparatus includes a memory for storing binary signals representing boundary voltages having magnitudes corresponding to magnitudes of the tuning voltage between tuning voltage ranges for respective adjacent channels. As the memory locations are addressed, the boundary voltages are compared to the tuning voltages. Control apparatus causes the memory location associated with the next boundary voltage to be addressed and causes channel number apparatus to generate binary signals representing the next channel number when the magnitude of a predetermined one of the boundary voltage associated with an addressed one of the memory locations and the tuning voltage exceeds the magnitude of the other one. Display apparatus displays the channel number represented by the binary signals generated by the channel number apparatus.

REFERENCES:
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patent: 3973206 (1976-08-01), Haselwood et al.
patent: 3986154 (1976-10-01), Yamada et al.
patent: 4048562 (1977-09-01), Haselwood et al.
patent: 4081752 (1978-03-01), Sumi
patent: 4093922 (1978-06-01), Buss
patent: 4164711 (1979-08-01), Steckler et al.
patent: 4165489 (1979-08-01), Zato
patent: 4209751 (1980-06-01), Sakamoto
"A Microcomputer Controlled Freq. Synthesizer for TV" by Rzeszewski et al., 2/18/78.

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