Circuit for displaying selection of a channel in a television se

Details Circuit for displaying selection of a channel in a television se Circuit for displaying selection of a channel in a television se

1984-12-12

1987-03-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455159, H04N 550

Patent

active

046494294

ABSTRACT:
There is provided a circuit for displaying selection of a channel in television sets. In the circuit, the output voltage from a saw tooth generator generating a saw tooth wave by a horizontal pulse signal is compared with reference voltages applied to the respective connection points of the registers at the operational amplifiers and, thereby, a color bar is generated on a television screen when low level signals are output from both the operational amplifiers. The circuit is constructed in such a manner that changes in the width of the color bar on both sides correspond to the change of reference voltages at the connection points which fluctuate according to the output voltages of an automatic fine tuning circuit (AFT).

REFERENCES:
patent: 3598906 (1971-08-01), Uetake et al.
patent: 4160278 (1979-07-01), Nelson
patent: 4214273 (1980-07-01), Brown
patent: 4366502 (1982-12-01), Shiu
patent: 4387401 (1983-06-01), Henderson et al.

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