Method, device, DSP and modem for efficient echo canceler phase

Details Method, device, DSP and modem for efficient echo canceler phase Method, device, DSP and modem for efficient echo canceler phase

1995-06-26

1997-04-29

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Antinoise or distortion

375346, 370286, 379406, 379410, H04B 1500

Patent

active

056256469

ABSTRACT:
The present invention provides a novel method, device, digital signal processor and modem for efficiently determining and tracking a phase roll of a far end echo by utilizing a novel phase error generator and a novel, efficient replica generator. The efficient replica generator utilizes a uniquely positioned phase rotator to facilitate replication of the far end echo. A unique combination of a Hilbert phase splitter and a conjugate Hilbert phase splitter together with a rectangular to polar converter enable the novel phase error generator to provide a reliable phase error.

REFERENCES:
patent: 4736414 (1988-04-01), Montagna et al.
patent: 5132963 (1992-07-01), Ungerboeck
patent: 5247512 (1993-09-01), Sugaya et al.
patent: 5483594 (1996-01-01), Prado et al.
patent: 5528687 (1996-06-01), Tanaka et al.

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