Carbon microphone interface for a modem

Details Carbon microphone interface for a modem Carbon microphone interface for a modem

1996-01-29

1996-09-24

Zele, Krista M.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 93, 379394, 379442, 379398, H04M 176

Patent

active

055598692

ABSTRACT:
A traditional modem includes a data access arrangement circuit located between the computer and the RJ11 connector. An alternate connection is made from this data access arrangement circuit to an input of a carbon microphone interface circuit. This carbon microphone interface circuit includes a galvanic isolation circuit and an impedance matching circuit. The input to the carbon microphone interface circuit is thus transformed to a format which is compatible with a traditional carbon microphone found in the handset of practically all telephones. Therefore, the output of the carbon microphone interface circuit can be directly connected to the handset of a telephone (or other carbon microphone audio terminal device), independent of the location or type of subscriber interface at the wall jack.

REFERENCES:
patent: 4825465 (1989-04-01), Ryan
patent: 4864567 (1989-09-01), Giorgio
patent: 4894864 (1990-01-01), Cook
patent: 4907267 (1990-03-01), Gutzmer
patent: 4989243 (1991-01-01), Choi
patent: 5133006 (1992-07-01), Khuat
patent: 5239580 (1993-08-01), Bruno et al.
Bigelow, "Understanding Telephone Electronics Third Edition", Sams, 1991, pp. 296 & 297.

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