Memory type tuning system with provisions for skipping nonprefer

Details Memory type tuning system with provisions for skipping nonprefer Memory type tuning system with provisions for skipping nonprefer

1977-12-23

1979-06-19

Griffin, Robert L.

325455, H04B 126

Patent

active

041588169

ABSTRACT:
A tuning system of a television receiver includes a memory with a plurality of memory locations for storing tuning information associated with various channels a viewer may select. Each memory location includes a display portion for storing a binary word representing, in BCD format, information for displaying the channel number of an associated channel and a tuning voltage portion for storing a binary word representing information for generating the appropriate tuning voltage for the associated channel. When it is desired to have a channel skipped over during the normal channel selection mode of operation of the tuning system, in response to viewer control, an input complementor complements each of the binary signals of the binary word stored in the display portion of the associated memory location to form the "1s" complement of the binary word representing the channel number of the channel and thereby identify the associated channel as a nonpreferred channel. Since the "1s" complements of the binary words representing channel numbers between 2 and 83 represent illegal channel numbers, (i.e., channel numbers not between 2 and 83), an illegal channel number decoder is used to cause memory locations containing binary signals representing illegal channel number to be skipped during the normal channel selection mode of operation of the tuning system. When it is desired to reinstate a previously skipped channel, an output complementor, in response to viewer control, recomplements each binary signal of the previously complemented binary word representing the associated channel number.

REFERENCES:
patent: 4005368 (1977-01-01), Tanaka
patent: 4024476 (1977-05-01), Briggs
patent: 4031474 (1977-07-01), Ehni
Magnavox Service Manual, 703777 Videomatic Touch Tune Assembly, Manual No. 7353.

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