Sub-miniature radio telephone decoder

Details Sub-miniature radio telephone decoder Sub-miniature radio telephone decoder

1979-06-08

1981-06-23

Brigance, Gerald L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 34, 340167R, H04Q 704

Patent

active

042752710

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.

REFERENCES:
patent: 3387270 (1968-06-01), Adlhoch et al.
patent: 3458664 (1969-07-01), Adlhoch et al.
patent: 3581019 (1971-05-01), Ryan
patent: 3652805 (1972-03-01), Wisner
patent: 3763324 (1973-10-01), Garcia et al.
patent: 3859475 (1975-01-01), Wulfsberg et al.
patent: 3936616 (1976-02-01), Di Gianfilippo et al.

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