Masco Corporation of Indiana

Cecil Ernest Mathis

George H Fathauer

Warren L Williamson

There is disclosed a processor controlled scanning radio receiver which employs a microprocessor controller to operate in various modes. One mode of operation is a search/recall mode wherein frequencies located during an automatic search operation are stored in a recirculating storage device for later user recall. The recirculating storage device is also employed to store frequencies or 'birdies' to be locked out during a search operation. The channels to be scanned are stored in an electrically alterable read only memory in which the channels are arranged in five banks having ten channels per bank. A keyboard is included via which a user may select or deselect any one or more banks for the scanning operation.

Processor controlled scanning radio receiver

A signal-seeking scanning radio receiver employing a selective rescan delay circuit for delaying automatic resumption of multi-channel scanning for a period of time following termination of a signal on a tuned channel in response to an auxiliary output signal from a memory programmed to provide auxiliary output signals only for certain preselected channels tuned to a predetermined frequency on which two-way communications are anticipated without delaying automatic scan resumption for channels on which only one-way communications are anticipated.

Selective rescan delay for multi-channel scanning radio receiver

There is disclosed a signal-seeking, scanning superheterodyne radio receiver using frequency synthesizing apparatus to generate the required local oscillator signals and capable of receiving signals on all four bands comprising the public service radio frequencies. The frequency synthesizing apparatus includes circuitry for selectively altering the frequencies of the reference oscillator signal and the offset oscillator signal. Alteration of the reference oscillator signal frequency permits economical use of the same frequency synthesizing apparatus in different bands wherein the spacing between adjacent frequencies is different, whereas alteration of the offset oscillator signal frequency permits the generation of local oscillator signals which fall between multiples of the reference signal frequency.

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Indianapolis, IN, United States of America

Cecil Ernest Mathis