Rca Inc.

Rca Licensing Corporation

Warren C DeVilbiss

Gary T Osborne

Apparatus to permit service adjustment of a television receiver includes a microprocessor which normally controls parameters of a video signal processed by the receiver. The microprocessor also automatically establishes a desired video signal reference condition for the service mode when manual service controls are to be adjusted. The service mode is entered by pressing a designated microprocessor keyboard key while plugging the receiver into a source of primary AC power.

Apparatus for aligning an image display device in a video signal

An AC line signal of unknown frequency is compared to a signal of known reference to determine the frequency of the AC line signal. Thereafter, the AC line frequency signal is used as a time-base for keeping real time.

Automatic determination of time base in electronic time-keeping apparatus

A 'cable-ready' receiver includes a controller for selecting broadcast ('air') and cable channels tuned by a tuner. When switching between air and cable tuning modes the controller stores the number of the channel tuned in the previous mode and retunes the tuner to the stored channel if the number is within a range of valid channel numbers for the new tuning mode. If not, the controller increments the number until it is both in the range and present in a user selected channel tuning list and retunes the turner to the incremented number. In another embodiment the controller increments the number until it is within the valid channel range and a video detector signifies that the channel is occupied. Both examples increase the likelihood that an active channel will be tuned when changing the air/cable tuner operating modes.

Cable broadcast TV receiver with automatic channel search responsive to

A television receiver includes a micro-computer which controls the receiver functions and provides on-screen display of messages for prompting the user. Display characters are compacted to minimize memory space by encoding the characters in 4-bit nibbles to maximize storage efficiency in a ROM organized to store 8-bit bytes.

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Noblesville, IN, United States of America

Warren C DeVilbiss