Terminal for wirebound telecommunication

Details Terminal for wirebound telecommunication Terminal for wirebound telecommunication

1996-11-26

1998-12-08

Hunter, Daniels S.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

399387, 399388, 399377, H04M 100

Patent

active

058481478

ABSTRACT:
A terminal (1) for wirebound telecommunication according to the invention comprises a class D amplifier which is supplied with a rectified ringing voltage (V.sub.ring) coming from the line (2) in a ringing condition and, in an off-hook condition, is supplied with the line voltage (V.sub.ln) coming from the line (2). A class D amplifier (20) is advantageous in that it is suitable for use with supply voltages which may vary over a large range. As a result, both the rectified ringing voltage (V.sub.ring) and the line voltage (V.sub.ln) can plainly be used as a supply voltage for the amplifier (20) and no additional circuits are necessary for matching these voltages.

REFERENCES:
patent: 4233474 (1980-11-01), Hishinuma et al.
patent: 4748664 (1988-05-01), Blomley
patent: 4856055 (1989-08-01), Schwartz
patent: 5118997 (1992-06-01), El-Hanansy
patent: 5155764 (1992-10-01), Malaurie et al.
patent: 5410592 (1995-04-01), Wagener et al.
patent: 5672998 (1997-09-01), Wittlinger
Wirebound telecom applications handbook 1995, Philips Semiconductors, pp. 125-145.
"Designing a Versatile Telephone Set--part IV", New Electronics, Nov. 6, 1995, David O'Neill Mullard.

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