Resumes
Resumes
Chung Lu Phones & Addresses
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Plainsboro, NJ
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Princeton Jct, NJ
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Knoxville, TN
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New Brunswick, NJ
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Philadelphia, PA
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Edison, NJ
Publications
Us Patents
Predictor Controlled Encoder For Digital Transmission Systems
View pageUS Patent:
49424670, Jul 17, 1990
Filed:
Dec 5, 1988
Appl. No.:
7/280053
Inventors:
Harvey Waldman - Yardley PA
Chung H. Lu - Plainsboro NJ
Chung H. Lu - Plainsboro NJ
Assignee:
General Electric Company - Schenectady NY
International Classification:
H04N 7137
US Classification:
358135
Abstract:
A pre-encoder look-up table (LUT) provides output symbols for a statistical coder in response to signals representing a prediction of a prediction signal in a differential pulse code modulation (DPCM) system. The normal prediction signal is used as one address to the LUT and the prediction of that normal signal is used as a second address. The average probability distribution of the signals is determined to construct the LUTs wherein the output symbols are assigned values corresponding to different average probabilities of occurrence of the signal to be processed to thereby reduce the entropy further without adding overhead control symbols to the transmission system.
Generalized Chrominance Signal Demodulator For A Sampled Data Television Signal Processing System
View pageUS Patent:
47454636, May 17, 1988
Filed:
Sep 25, 1986
Appl. No.:
6/911424
Inventors:
Chung H. Lu - Plainsboro NJ
Assignee:
RCA Licensing Corporation - Princeton NJ
International Classification:
H04N 950
US Classification:
358 23
Abstract:
In an NTSC digital television receiver, the composite video signal is digitized with a sampling frequency of 32/13 times the color subcarrier frequency, f. sub. c. The chrominance signal component of this video signal is demodulated using a pair of finite impulse responsive filters having programmable weighting factors. The weighting factors are changed in a 32 step sequence as 32 consecutive chrominance samples are applied to the filters. The circuitry which generates the weighting factors is responsive to a phase alignment signal to determine when the 32 step sequence begins.
Non-Linear Processor For Reducing The Dynamic Range Of A Digitized Error Signal
View pageUS Patent:
46849831, Aug 4, 1987
Filed:
Jul 31, 1986
Appl. No.:
6/890958
Inventors:
Alfonse Acampora - Staten Island NY
Chung H. Lu - Plainsboro NJ
Chung H. Lu - Plainsboro NJ
Assignee:
RCA Corporation - Princeton NJ
International Classification:
H04N 712
US Classification:
358135
Abstract:
In systems in which the current digitized level value of a synthesized-signal sample (e. g. , a television video signal sample) is determined by summing a transmitted error-signal-sample level value and a delayed previous synthesized-signal-sample level value, the dynamic range of the transmitted error-signal samples are reduced by as much as one-half. This is accomplished by passing the error-signal samples through a first non-linear processor (NLP) before transmission thereof and then passing the summed output through a second NLP. Both NLPs exhibit the same specified transfer function taught by the present invention.
Apparatus For Noise Reducing Composite Video Signal
View pageUS Patent:
47378506, Apr 12, 1988
Filed:
Nov 1, 1985
Appl. No.:
6/793734
Inventors:
Chung H. Lu - Plainsboro NJ
Alfonse Acampora - Staten Island NY
Alfonse Acampora - Staten Island NY
Assignee:
RCA Corporation - Princeton NJ
International Classification:
H04N 521
US Classification:
358167
Abstract:
In field/frame recursive filters for providing noise reduction to composite video signal, inversion of the chrominance component of the composite video signal is obviated by selecting nearest neighbor in-phase field/frame delayed signals for recursion. The system arbitrates between two or more nearest neighbor in-phase signals or combinations thereof and feeds back the signal having an amplitude most closely matching the incoming composite video signal.