Dual tone multiple frequency receiver/decoder

Details Dual tone multiple frequency receiver/decoder Dual tone multiple frequency receiver/decoder

1974-10-29

1976-05-25

Claffy, Kathleen H.

H04M 150

Patent

active

039596036

ABSTRACT:
A method and apparatus for separating the two analog component signals which make up a dual tone multiple frequency (Touch Tone) signal, converting the component signals into digital identification signals representative of the component signals, and then recombining the identification signals and developing a digital output signal which corresponds to the particular input signal. The apparatus includes signal separating means for separating the input analog signal into its two component signals, frequency identification decoding means for identifying the two component signals and developing digital identification signals corresponding thereto, and digital logic means responsive to the identification signals and operative to develop particular one-of-sixteen digital output signals which correspond to the particular Touch Tone signal input to the system.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3760269 (1973-09-01), Beeman
patent: 3784758 (1974-01-01), McIntosh
patent: 3790720 (1974-02-01), Schartmann
patent: 3882283 (1975-05-01), Proudfoot
patent: 3912869 (1975-10-01), Ullakko

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