The Magnavox Company

Daniel A Heuer

Arthur N Borg

Bruce E Smith

Frederick W Caspari

Jerry D Trostel

A tuning system is provided in which the tuning function is substantially integrated in a microprocessor. A fixed modulus counter is cascaded with a programmable counter (or timer) found within the microprocesor thereby extending the counting range of the programmable counter. Then by prescaling the output of the local oscillator to a value below the toggle frequency of the microprocessor counter, the microprocessor may periodically measure the output frequency of the oscillator and, if necessary, generate correction signals therefor.

Frequency synthesized tuning system using a microprocessor

A microprocessor control system is described for effecting channel tuning and function selection in a television receiver. The system will respond to commands entered by a set of controls at the television receiver or to remote control commands received at the television receiver. A channel number display is also provided whereby the channel number of a station currently tuned is displayed. A microprocessor within the system is programmed to validate control information received from an operator either by remotely generated commands or by controls located on the television receiver. Operator supplied information is processed and implemented by the microprocessor control system to effect control over the television receiver.

Microprocessor control system for television receivers

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 tuning a varactor tuning system by means of a keyboard or other switch means. By selecting switches representing the digits of a channel member, a signal is provided for tuning a given channel with a varactor tuner. When a station having a channel number corresponding to the selected channel number is tuned, the tuning of the varactor tuner is inhibited.

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Fort Wayne, IN, United States of America

Daniel A Heuer