Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1994-11-21
1995-12-12
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348614, 348914, 348611, H04N 5213
Patent
active
054754445
ABSTRACT:
A channel equalization system of a VSB transmission system for a HDTV which can correct phase errors by using composite filters as well as by using general data even in a period having no training sequence. The channel equalizer for a HDTV includes, a composite filter part for making the input signal applied from outside produced as a I signal and a Q signal, filtering the I signal and the Q signal according to composite filter coefficients, and transmitting the filtered I and Q signals as first and second output signals. A composite filter restoring part for calculating an error for the training sequence and an error for the general data using a synchronization signal received from outside of the channel equalizer, the first and second output signals, and calculating real composite filter coefficients and imaginary composite filter coefficients based on the errors for the I signal and the Q signal produced at the composite filter part and training sequence and the error for general data and transmitting the calculated errors to the composite filter part.
REFERENCES:
patent: 4091418 (1978-05-01), Ciciora
patent: 5315617 (1994-05-01), Guida
Goldstar Co. Ltd.
Groody James J.
Hsia Sherrie
LandOfFree
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