Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-04-21
1997-02-11
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348726, 375340, 375346, H04N 521
Patent
active
056026013
ABSTRACT:
A phase error corrector for an HDTV reception system, which can correct data level errors by reducing phase errors coming from local oscillators, includes a gain and offset adjustment unit for adjusting a gain and an offset of incoming I data, a Hilbert transform filter for performing a Hilbert transform filtering of the I data received from the gain and offset adjustment unit for generating Q data, a log LUT for producing logarithmic values of the I data and the Q data received from the gain and offset adjustment unit and the Hilbert transform filter into a logI value and a logQ value respectively, a complex multiplexer for generating a corrected I value and a corrected Q value having their errors corrected out of the logI value and the logQ value received from the log LUT, a phase error detector for detecting phase errors from the corrected I value and the corrected Q value received from the complex multiplexer, and a loop filter for accumulating phase errors received from the phase error detector and applying the accumulated phase errors to the complex multiplexer. The phase error detector advantageously can reduce slice errors caused by phase noise coming from the local oscillator used in a tuner by correcting phase errors, and can be applicable not only to an HDTV but also a QAM for correcting phase errors in an 8 VSB system.
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Jung Su W.
Kim Jong G.
Kim Kyeong S.
Grant Chris
Kostak Victor R.
L. G. Electronics Inc.
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