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Self-Balancing Line Hybrid Using Compound Adaptive Equalizer

IP.com Disclosure Number: IPCOM000063593D
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Davis, GT Robinson, RH [+details]

Abstract

A technique is described whereby a self-balancing line hybrid using digital and analog technology combined with existing concepts are used to obtain significantly improved receiver sensitivity. The technique used also provides a balanced phone line and permits the use of log-PCM codecs (logarithmic pulse code circuit modules), in an analog-to-digital interface to provide for a full-duplex modem where strong transmit signals would otherwise cover up a weak receive signal, by forcing the codec to operate on the low resolution part of its transfer characteristic. The line hybrid is typically used to interface electronic devices to commercial telephone networks.