Frequency tone detection

Details Frequency tone detection Frequency tone detection

1976-01-26

1977-04-05

Claffy, Kathleen

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78D, H04M 150

Patent

active

040163717

ABSTRACT:
The detection of frequency tones, such as used in telephone pushbutton dialing to identify the digits of a called number, is performed in a digital manner which affords both speed and reliability of detection, by repetitively measuring the frequency of a frequency tone so that each measured frequency can be assigned to one of a plurality of valid frequency bands, maintaining a count thereof for the individual frequency bands, and assigning the frequency tone to the first frequency band to achieve a predetermined count level.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3573633 (1971-04-01), Marrero
patent: 3790720 (1974-02-01), Schartmann
patent: 3801906 (1974-04-01), Harris
patent: 3949177 (1976-04-01), Ball

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