The Magnavox Company

Arthur N Borg

Daniel A Heuer

Bruce E Smith

Jerry D Trostel

Apparatus for automatically restoring information concerning a plurality of broadcast station frequencies in a microprocessor type tuning system when such information is inadvertently lost from a volatile memory.

Self-programing memory tuning system

Apparatus is provided for automatically compensating for frequency drift in a digitally tuned varactor tuner. An Automatic Frequency Control signal for tuning the varactor tuner is produced in response to the direction of a tuning error. A signal level detector is used to inhibit the AFC signal when weak signals are being tuned by the varactor tuner thereby preventing continuous searching by the tuning system.

Automatic frequency control for digital tuning systems

A channel number display device for a television receiver for displaying the numerals of the channel to which the receiver is tuned with the display being initially bright immediately after a channel change, and then after a predetermined time of several seconds, being reduced in brightness so as not to distract from the program material. Through the use of a thyristor, regardless of the number of individual elements in the numerical display, the brightness levels may be held to predetermined quantities.

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Fort Wayne, IN, United States of America

Arthur N Borg