DTMF detection for voice processing equipment

Details DTMF detection for voice processing equipment DTMF detection for voice processing equipment

1995-07-26

1996-06-18

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379386, H04M 304

Patent

active

055286631

ABSTRACT:
By testing a received signal for power, frequency content, and stability, one can measurably improve DTMF signal detection and identification performance in voice store and forward systems. The algorithms described here have been found to be especially useful in minimizing talk-off. Further, the approach improves the performance with acoustic-type generators and minimizes transhybrid loss.

REFERENCES:
patent: 4580016 (1986-04-01), Williamson
patent: 4599495 (1986-07-01), Richards
patent: 4853958 (1989-08-01), Rabipour et al.
patent: 4903292 (1990-02-01), Dillon
patent: 5073941 (1991-12-01), Locke et al.
patent: 5163050 (1992-11-01), Cromack
patent: 5203011 (1993-04-01), Bane et al.
EDN Electrical Design News, Newton, Massachusetts, USA p. 205, vol. 30, No. 6, Mar. 1985 P. Mock `Add DTMF Generation and Decoding To DSP-uP Designs`.

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