Echo canceller for bidirectional transmission on two-wire subscr

Details Echo canceller for bidirectional transmission on two-wire subscr Echo canceller for bidirectional transmission on two-wire subscr

1988-02-17

1989-12-19

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

048887625

ABSTRACT:
An echo canceller for bidirectional transmission on two-wire metallic subscriber lines in an integrated service digital network employing a filter positioned in the echo path having the property that a zero point is located so as to cancel the echo path transfer function attributable to the inductance component of the line coupling transformer.

REFERENCES:
patent: 4344176 (1982-08-01), Qureshi
patent: 4362909 (1982-12-01), Snijders et al.
patent: 4628157 (1986-12-01), Chance et al.
patent: 4748498 (1988-05-01), Yamanashi et al.
P. F. Adams, S. A. Cox and P. J. Glenn, "Long Reach Duplex Transmission Systems for ISDN Access", pp. 35-42, British Telecommunications J., vol. 2, No. 2, Apr. 1984.
P. F. Adams, "High Pass Filter Location in 2B1Q Transceivers", American National Standards Inst. Telecommunications Committee, Doc. No. T1D1.3/86-193, Oct. 8, 1986.

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