All digital LSI line circuit for analog lines
AssigneeInternational Telephone and Telegraph Corporation
InventorRobert Treiber
Life of this patent
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Abstract
A digital telecommunication line circuit implementable on one or more large scale integrated circuit (LSI) chips is described. A simplified integrated hardware structure is provided so as to achieve the combination on an LSI chip of an electronic two-to-four wire hybrid, line impedance matching by automatic digital impedance synthesizing of an output impedance and all digital filtering functions for an all LSI telephone line circuit including automatic equalizing.
Claims19
A digital telephone line circuit providing an interface between a full duplex analog telephone subscriber line and a digital switching system, comprising:
- means for automatically digitally synthesizing an output matching transmission line terminating impedance;
- two-to-four wire conversion means for digitally separating full duplex transmit and receive information signals on said subscriber line into a pair of digital signals, each separate from the other;
- automatic recursive equalizer means coupled to said two-to-four wire conversion means for providing time multiplexed signal optimization/equalization of said information signals by
- time multiplexing said recursive equalizer means to said full duplex line such that automatic equalization is provided for said line in accordance with its individual transmission line characteristics during the interval that said equalizer means is coupled to said two-to-four wire conversion means and to said means for digitally synthesizing an output matching transmission line terminating impedance.
Dependencies are inferred from the claim text.