Channel change indication circuit

Details Channel change indication circuit Channel change indication circuit

H - Electricity

03

J

365/7

H03J 7/04 (2006.01) H03J 5/02 (2006.01) H04N 5/50 (2006.01)

Patent

CA 1125445

ABSTRACT OF THE DISCLOSURE A limited-channel tuning system for a television receiver includes a memory whose activation time is directly related to its useful life. A channel address information means is coupled through an encoder to a series of flipflops which supply a first set of inputs of a corresponding plurality of comparators. The encoder also directly supplies a memory- accessing decoder and second set of inputs of the comparators. The outputs of the comparators are coupled through a NOR gate to a flipflop. The output of the flipflop supplies one input of an AND gate. A clock source drives all flipflops and the other input of the AND gate. The output of the AND gate drives a one-shot multivibrator for activating the memory with a short duration Read pulse only after a change in channel address input information occurs. -2-

322639

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