Adaptive digital filter with high speed and high precision coeff

Details Adaptive digital filter with high speed and high precision coeff Adaptive digital filter with high speed and high precision coeff

1996-10-11

1998-07-14

Mai, Tan V.

Boots, shoes, and leggings

G06F 1710

Patent

active

057814635

ABSTRACT:
An adaptive digital filter includes a finite impulse response digital filter for performing a convolution calculation by multiplying a code sequence with a coefficient sequence, and a coefficient calculation unit for performing the updating calculation of the coefficient sequence only when the calculation result of the finite impulse response digital filter belongs to a predetermined numerical value region other than numerical value regions which are defined in advance in correspondence with code values of the code sequence. Thus, a coefficient sequence is generated at high speed and with high precision without making the calculation result of the coefficient sequence diverge even for a code sequence in which considerable intersymbol interference has occurred due to disturbance on the transmission path, and the intersymbol interference can be removed.

REFERENCES:
patent: 5058047 (1991-10-01), Chung
patent: 5278780 (1994-01-01), Eguchi
"Joint Blind Equalization, Carrier Recovery, and Timing Recovery for High-Order QAM Signal Constellations," by Neil K. Jablon, IEEE Transcations on Signal Processing, vol. 40, No.6, Jun. 1992, pp. 1383-1398.
United States Advanced Television Systems Committee, draft Guide to the Use of the Digital Television Standard for HDTV Transmission Feb. 24, 1995, pp. 110-111.

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