Communication apparatus with cross-talk protection

Details Communication apparatus with cross-talk protection Communication apparatus with cross-talk protection

1992-02-06

1994-12-20

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379386, 379 88, 379 98, H04M 1100

Patent

active

053751663

ABSTRACT:
A communication apparatus includes a Dual Tone Multi-Frequency (DTMF) noise signal detector for detecting a first DTMF noise signal caused by the apparatus and a second DTMF signal detector for detecting a DTMF signal transmitted from another apparatus. If self-induced DTMF noise is sensed, the second DTMF signal detector is disabled. As a result, the communication apparatus is able to distinguish the DTMF noise signal caused by said apparatus from the DTMF signal transmitted from another apparatus.

REFERENCES:
patent: 4313038 (1982-01-01), Nilssen et al.
patent: 4431872 (1984-02-01), Edwards et al.
patent: 4841561 (1989-06-01), Hill
patent: 4885763 (1989-12-01), D'Brien et al.
patent: 5023903 (1991-06-01), Bowen
patent: 5172406 (1992-12-01), Locke
patent: 5187740 (1993-02-01), Swaim et al.

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