Selectively activated dual tone multi-frequency detector

Details Selectively activated dual tone multi-frequency detector Selectively activated dual tone multi-frequency detector

1994-01-12

1995-10-17

Hofsass, Jeffery A.

Telephonic communications

Supervisory or control line signaling

Signalling integrity protection

379 77, 379 88, 379282, 379283, H04M 300, H04M 164

Patent

active

054597811

ABSTRACT:
A technique for improved DTMF detection utilizes a speech detector, either alone or in combination with other information from a voice processing arrangement, to adjust the sensitivity of the DTMF detector. The DTMF detector is turned completely off when the voice processing application is in the record mode, and when speech is detected.

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