Echo canceller circuit

Details Echo canceller circuit Echo canceller circuit

1988-12-16

1990-05-22

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370 321, H04B 323

Patent

active

049283081

ABSTRACT:
An echo canceller circuit contains a network of capacitors binary-stepped in their capacitance, whose one set of plates, representing a center of the network, each are switchably connectable to a reference potential or, in the case of less significant bits of digital information to be converted, to ground potential, or to a fraction (U3, U4) of the reference potential. To avoid difficulties which might result from the offset voltage of an integrated operational amplifier (V) connected to the capacitor network, the network is composed of two symmetrical halves (COo' to C32o; COn' to 32n).

REFERENCES:
patent: 4195282 (1980-03-01), Cameron
patent: 4200863 (1980-04-01), Hodges et al.
patent: 4517549 (1985-05-01), Tsukakoshi
patent: 4661802 (1987-04-01), Yukawa
patent: 4669116 (1987-05-01), Agazzi et al.
patent: 4764753 (1988-08-01), Yukawa
O. E. Agazzi, "Large Scale Integration of Hybrid-Method Digital Subscriber Loops", Dissertation Univ. Ca. Berkeley; 5/20/82, pp. 161, 168, 169, 170, and 171.
"Hybrid with Automatic Selection of Balance Networks", A. de la Plaza, Conference, 1981 IEE Int. Symposium on Circuits and Systems, Chicago, Ill., 27-29 Apr. 1981, pp. 725-8.

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