Communication apparatus having improved switching line connectio

Details Communication apparatus having improved switching line connectio Communication apparatus having improved switching line connectio

1990-12-03

1992-09-01

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379100, 358438, 358443, H04M 1100

Patent

active

051446502

ABSTRACT:
A communication apparatus comprises a switch to selectively connect a line to a speech communication path or a data communication path, signal receiving circuits connected to those two communication paths, a signal detection circuit for detecting a predetermined signal from an output of the signal receiving circuit, and a control circuit for modifying a detection criterion of the signal detection circuit in accordance with a line connection status of the switch.

REFERENCES:
patent: 4794637 (1988-12-01), Hashimoto
patent: 4800439 (1989-01-01), Yoshino
patent: 4868865 (1989-09-01), Ogawa et al.

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