Telephone handset interface for alternating voice-data (AVD) mod

Details Telephone handset interface for alternating voice-data (AVD) mod Telephone handset interface for alternating voice-data (AVD) mod

1996-04-23

1997-04-29

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379442, 375222, H04M 1100

Patent

active

056256795

ABSTRACT:
An interface between an alternating voice-data (AVD) modem and a telephone that allows the modem to be connected to a PBX or office-type telephone system without using special software. The user speaks and listens through the telephone handset, which is disconnected from the telephone base and connected to the interface. The interface provides an impedance across the modem "Phone" connection. The impedance simulates the off-hook condition that would normally (i.e., when the modem is connected in the conventional manner to a non-PBX telephone) be provided by the non-PBX telephone and that, absent disabling the requirement by special software, the modem requires in order to properly switch between voice mode and data mode. The interface monitors the modem "Line" connection to detect whether the modem is in an off-hook state or an on-hook state. A compensation circuit minimizes attenuation of the wake-up tone by the impedance across the "Line" connection. When the interface detects that the modem is on-hook, the interface couples the handset to the telephone base. When the interface detects that the modem is off-hook, the relay circuit disconnects the handset and couples the modem "Line" connection to the telephone base.

REFERENCES:
patent: 5455859 (1995-10-01), Gutzmer
patent: 5473676 (1995-12-01), Frick et al.

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