Patent
1975-01-30
1978-10-31
Griffin, Robert L.
H04B 106
Patent
active
041237153
ABSTRACT:
There is disclosed a signal-seeking superheterodyne radio receiver for use on the public service radio frequencies capable of scanning among a plurality of channels and using frequency synthesizing apparatus to generate the required local oscillator signals. An electrically programmable, nonvolatile memory is included for controlling the frequency to which the receiver is tuned when it is operative on any given channel. The receiver includes a plurality of manually operated switches for selectively locking out individual ones of the receiver channels and inhibiting the reception of signals at the frequencies corresponding to the locked out channels. It further includes programming circuitry for altering the information contained in the memory and, thus, the frequency corresponding to any individual channel. The programming circuitry uses the channel lockout switches for data entry and includes apparatus for defeating the channel lockout function when data is being prepared and entered into the memory. Programming enabling circuitry is provided to insure that information contained in the memory is not unintentionally erased. The programming circuitry further includes unique circuits for inverting the logic function of certain of the logic components contained therein, thus permitting the same channel selection circuitry to be used for channel selection in both the read and erase modes of the memory.
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Griffin Robert L.
Masco Corporation of Indiana
Masinick Michael A.
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