Multifrequency detection

Details Multifrequency detection Multifrequency detection

1988-02-01

1991-12-17

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

379283, G10L 500

Patent

active

050739417

ABSTRACT:
The detection of DTMF tones is improved in a three-step process: first testing even-numbered samples; then testing odd-numbered samples, and finally testing for tone quality (time interval and frequency stability).

REFERENCES:
Architectural Overview, "TMS 320C25".

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