Sub-miniature radio telephone decoder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 23, 1981
Grant Date -
N/A
app pub date -
Jun 8, 1979
filing date -
Jun 8, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Presented herein is a sub-miniature radio telephone decoder which through a unique arrangement of integrated circuits adapted to create frequency detectors and counters provide the means whereby a radio telephone receiver is held in a muted state until a predetermined 600/1500 MTS code representing a phone number is decoded. When the predetermined code has been detected, the decoder unmutes the receiver and activates an audio signal. The functions are accomplished by first and second frequency detectors responsive to 600 Hz and 1500 Hz tones in combination with means to count frequency shifts between the two tones and interpret sets of shifts as digits of a predetermined telephone code.
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Family
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Cited Art Landscape
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