Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1996-04-12
1998-10-27
Grant, Chris
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348607, H04N 521
Patent
active
058284222
ABSTRACT:
Embodiments of methods and apparatuses for removing ghosts from a signal such as a communications signal received over a channel where the output symbol pattern is used for selecting correction factors for correcting the received symbols. The correction factor is added to the sampled symbols and the sampled symbol is compared with a selected one of a plurality of thresholds based upon the closeness of the various thresholds to a sequence of the corrected symbol values. That comparison forms the basis for the next output symbol in the output sequence. Further, the selected correction factor is updated by taking the difference between the selected correction factor and an error measurement between the corrected sample value and the nominal value of the symbol times a damping factor. At various points in the sequence, the output is forced to an expected symbol sequence such as a clocking sequence used for clock recovery.
REFERENCES:
patent: 4115811 (1978-09-01), Goff
patent: 5299004 (1994-03-01), Joo et al.
patent: 5321512 (1994-06-01), Huang
patent: 5654765 (1997-08-01), Kim
Grant Chris
WavePhore, Inc.
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