Circuit for cancelling whole or part of a waveform using nonrecu

Details Circuit for cancelling whole or part of a waveform using nonrecu Circuit for cancelling whole or part of a waveform using nonrecu

1988-02-29

1991-08-20

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379406, 379410, 379411, H04J 300

Patent

active

050420267

ABSTRACT:
The whole or part of a waveform is cancelled by a circuit comprising a nonrecursive filter and a recursive filter. The nonrecursive filter has a plurality of first multipliers having first tap weights for modifying symbols successively shifted along a shift register. The recursive filter is connected in a series circuit to the shift register and has a second tap weight for recursively modifying the output of the shift register. The recursively modified symbol is modified by a second multiplier having a third tap weight and combined in an adder with the symbols modified by the first tap weights to produce a replica of an undesired waveform. The replica is destructively combined in a subtractor with an incoming symbol having an undesired waveform. The output of subtractor is utilized to derive the tap weights to adaptively control the inputs to the adder.

REFERENCES:
patent: 4016410 (1977-04-01), Eggermont
patent: 4057696 (1977-11-01), Gitlin et al.
patent: 4321705 (1982-03-01), Nimiki
patent: 4747068 (1988-05-01), Voorman et al.
patent: 4868874 (1989-09-01), Tokatori et al.
"Architecture for Fully Integrated Echo Canceller LSI Based on Digital Signal Processing", Takatori et al., IEEE International Communication Conference, Jun. 7-10, 1987, Seattle Wash., pp. 0601-0605.
"Mixed Recursive Echo Canceller", Mogavero et al., IEEE International Communication Conference, 1986, pp. 0044-0048.

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