Interface circuitry for acoustic coupler compensation

Details Interface circuitry for acoustic coupler compensation Interface circuitry for acoustic coupler compensation

1979-02-21

1981-09-08

Popek, Joseph A.

H04M 1100

Patent

active

042886619

ABSTRACT:
For the type of modem that transmits information by way of quadrature amplitude modulation (QAM) over a telephone line, an electronic circuit for compensating for amplitude distortion created by use of an acoustic coupler with an ordinary telephone handset.
The circuit is positioned in the acoustic coupler between the modem and the coupler's microphone and receiver. This circuit compensates for amplitude distortion introduced by the acoustic coupling within the data transmission frequency bands of the modem.

REFERENCES:
patent: 3535456 (1970-10-01), Wilson
patent: 3808369 (1974-04-01), Libby
patent: 4100373 (1978-07-01), Perkins

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