TV Receiver with multiplexed microprocessor keyboard scanning an

Details TV Receiver with multiplexed microprocessor keyboard scanning an TV Receiver with multiplexed microprocessor keyboard scanning an

1982-05-24

1985-06-25

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455154, 455161, H04N 544, H04N 550

Patent

active

045257400

ABSTRACT:
A system eliminates digital switching video noise by performing several microprocessor controlled operations in a television receiver during the vertical retrace interval. A microprocessor maintained in an idle state until detection of a vertical retrace pulse initiates channel selector keyboard scan, channel number display update, and phase locked loop tuning information update during the vertical interval by multiplexing control outputs therefrom on a limited number of microprocessor IC pins. This approach provides for the regular and continuous updating of television receiver operating parameters while eliminating digital switching noise from the receiver's video display generated by the transfer of digital data representing the aforementioned operating parameters.

REFERENCES:
patent: 4387440 (1983-06-01), Borg

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