Feng Kuo

US Patent:

6833875, Dec 21, 2004

Filed:

Sep 2, 1999

Appl. No.:

09/387389

Inventors:

Feng Yang - Plano TX
Chi-Hao Yang - San Jose CA
Feng Kuo - San Jose CA
Chien-Chung Huang - San Jose CA

Assignee:

Techwell, Inc. - San Jose CA

International Classification:

H04N 978

US Classification:

348665, 348639, 348667, 348505, 348542

Abstract:

A video decoder for decoding a composite video signal. The decoder includes an analog-to-digital converter (ADC), an input resampler, and a Y/C separator, all coupled in series. The ADC receives and digitizes the composite video signal to generate ADC samples. The input resampler receives and resamples the ADC samples with a first resampling signal to generate resampled video samples. The Y/C separator receives and separates the resampled video samples into luminance and chrominance components. The Y/C separator includes a delay element configured to receive the resampled video samples and provide a variable amount of delay. The variable amount of delay can be adjustable from line to line, and is typically based on an approximated duration of a video line. For an NTSC signal, the variable delay is select to be (mÂn+m/2) samples, where m is a ratio of frequencies of the resampling signal and a color subcarrier of the composite video signal, and n is an integer selected such that (mÂn+m/2) samples most approximate the duration of a video line. For a PAL signal, the variable delay is selected to be (mÂn+3m/4) samples.

US Patent:

49183281, Apr 17, 1990

Filed:

May 3, 1988

Appl. No.:

7/190955

Inventors:

Feng Kuo - Purdys NY

Assignee:

Hypres Incorporated - Elmsford NY

International Classification:

H03K 402
H03K 3315
H03K 338

US Classification:

307227

Abstract:

In a time domain reflectometer a first step generator may include two branches of elements which are current sensitive and will produce a gap voltage if the current exceeds a specific threshold. Each branch may include either Josephson junction devices or tunnel diodes. When a trigger signal plus a bias current exceed a threshold value a first one of the elements in a first branch produces a gap voltage and diverts current to the second branch. The current causes all of the elements in the second branch to produce gap voltages and the current is diverted back to the first branch to switch the states of the remaining elements of the first branch. Once all of the elements in both branches produce gap voltages, the total signal produced by these elements is transmitted to a third output branch. The circuit produces a fast step signal and lends itself to expansibility whereby the amplitude of the step signal can be varied by varying the number of elements in the branches of the circuit.

US Patent:

20170280087, Sep 28, 2017

Filed:

Mar 28, 2016

Appl. No.:

15/082394

Inventors:

- San Jose CA, US
Feng Kuo - San Jose CA, US

International Classification:

H04N 5/38
H04N 7/01
H04N 7/18

Abstract:

A method and an apparatus for improving digital video signal transmission over a long transmission line are disclosed. A simple equalization reference signal is generated and then combined with a digital video signal in the digital domain such that the transmission of the reference signal takes place at a predefined time period during the vertical blanking interval of the video signal. The combined signal is then converted into an analog video transport signal, which analog signal is then transmitted over the long transmission line to a downstream video receiver. The equalization reference signal is extracted and used at the video receiver to restore the analog video signal which in turn is converted back to digital video signal.