Sub-miniature tone encoder with automatic number identification

Details Sub-miniature tone encoder with automatic number identification Sub-miniature tone encoder with automatic number identification

1980-09-22

1982-10-19

Popek, Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 36, 328 14, H04M 150

Patent

active

043552102

ABSTRACT:
A digitally synthesized tone encoder and automatic number identification generator for a radio-telephone is presented herein. The system includes a tone burst generator for producing two audio tones simultaneously in response to either a keypad input or sequencing of a multiplexer providing a single-pole eight-throw switching function in response to the incrementing of a counter.

REFERENCES:
patent: 3766523 (1973-10-01), Brocker et al.
patent: 3798545 (1974-03-01), Schultz et al.

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