Jing C Chen

US Patent:

6731685, May 4, 2004

Filed:

Sep 20, 2000

Appl. No.:

09/665373

Inventors:

Vincent Liu - San Diego CA
Siu-Wai Wu - San Diego CA
Hanson On - San Diego CA
Robert S. Nemiroff - Carlsbad CA
Michael Casteloes - Poway CA
Jing Yang Chen - San Diego CA
Rebecca Lam - San Diego CA

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N 712

US Classification:

37524014, 370477, 3483851

Abstract:

A statistical multiplexer for coding and multiplexing multiple channels of digital television data, or multiple panels of HDTV digital television data. A bit rate need parameter is determined for each encoder in a stat mux group by scaling the complexities of previous pictures of the same and different picture types. Scaling factors based on an activity level, motion estimation score, and number of pictures of a certain type in a GOP, may be used. Moreover, the scaling factors may be bounded based on a linear or non-linear operator to prevent large variations in the factors. An encoding bit rate is allocated to each channel based on its need parameter.

US Patent:

7110455, Sep 19, 2006

Filed:

Aug 14, 2001

Appl. No.:

09/929553

Inventors:

Siu-Wai Wu - San Diego CA, US
Jing Yang Chen - San Diego CA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N 7/12

US Classification:

37524016, 382272, 348699

Abstract:

Noise is reduced in a video system by applying motion compensated temporal filtering using previously generated motion vectors and adaptive spatial filtering at scene change frames. Various types of noise can be introduced into video prior to compression and transmission. Artifacts arise from recording and signal manipulation, terrestrial or orbital communications, or during decoding. Noise introduced prior to image compression interferes with performance and subsequently impairs system performance. While filtering generally reduces noise in a video image, it can also reduce edge definition leading to loss of focus. Filtering can also tax system throughput, since increased computational complexity often results from filtering schemes. Furthermore, the movement of objects within frames, as defined by groups of pixels, complicates the noise reduction process by adding additional complexity. In addition to improvements made to FIR spatial filtering, the present invention improves on previous filtering techniques by using Infinite Impulse Response (IR) temporal filtering to reduce noise while maintaining edge definition.

US Patent:

7512182, Mar 31, 2009

Filed:

Aug 30, 2004

Appl. No.:

10/929976

Inventors:

Jing Yang Chen - San Diego CA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N 1/58
H04N 1/409
H04N 5/911

US Classification:

37524029, 37524026

Abstract:

A method () and apparatus () for reducing noise in a video signal calculates () a discrimination value of a filter based on a magnitude difference between a current frame and a prior frame of a sequence of frames and modifies () the current frame using the modified discrimination value. The output of the filter is calculated as follows:()=()βwherein:.

US Patent:

7653129, Jan 26, 2010

Filed:

Dec 28, 2004

Appl. No.:

11/023775

Inventors:

Yong He - San Diego CA, US
Siu-Wai Wu - San Diego CA, US
Jing Yang Chen - San Diego CA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N 7/12

US Classification:

37524003, 375240, 37524001, 37524012

Abstract:

The present invention discloses a system and method for adaptive adjustment of bit budget that favors the allocation of bits to intra coding frames (I frames). Namely, an encoder is able to dynamically adjust the bit budget for each picture type in an image sequence, thereby effecting proper usage of the available transmission bandwidth and improving the picture quality. In one embodiment, the present invention will allocate more encoding bandwidth to a current Intra coding frame when the average quantization level of inter coding frames (e. g. , P and B frames) of a previous group of pictures is relatively high.

US Patent:

8160161, Apr 17, 2012

Filed:

Sep 18, 2008

Appl. No.:

12/233315

Inventors:

Jing Yang Chen - San Diego CA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N 1/58
H04N 1/409
H04N 5/911

US Classification:

37524029, 37524026

Abstract:

A method () and apparatus () for reducing noise in a video signal calculates () a discrimination value of a filter based on a magnitude difference between a current frame and a prior frame of a sequence of frames and modifies () the current frame using the modified discrimination value. The output of the filter is calculated as follows:()=()βwherein:.

US Patent:

8510107, Aug 13, 2013

Filed:

Nov 18, 2009

Appl. No.:

12/620762

Inventors:

Robert S. Nemiroff - Carlsbad CA, US
Jing Yang Chen - San Diego CA, US
Siu-Wai Wu - San Diego CA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

G10L 21/04

US Classification:

704229

Abstract:

A detector for determining an audio data bit rate of a pre-compressed audio elementary stream (AES), in which the pre-compressed AES includes a plurality of preamble length fields is provided. The detector includes an analyzer module configured to determine one or more candidate audio data bit rates of the AES from the plurality of preamble length fields, a detector module configured to determine whether one or more of the candidate audio data bit rates are correct, and a selector module configured to select one of the one or more candidate audio data bit rates determined to be correct as the audio data bit rate of the pre-compressed AES.

US Patent:

8588310, Nov 19, 2013

Filed:

Aug 31, 2010

Appl. No.:

12/872931

Inventors:

Jing Yang Chen - San Diego CA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N 7/26

US Classification:

37524025, 37524001

Abstract:

A method for managing delivery of encoded bits to a decoder is disclosed. In the method, a number of bits associated with a variable system delay is determined. The variable system delay is a time interval between each of a plurality of frames being encoded and decoded and is measured with respect to a current time for each of the plurality of frames. A number of bits in an encoder buffer for an encoder is determined. A number of bits in a decoder buffer for a decoder configured to receive encoded bits from the encoder is determined based on the bits associated with the variable system delay and the bits in the encoder buffer. Delivery of the encoded bits to the decoder is managed based on the number of bits determined to be in the decoder buffer.

US Patent:

20050094965, May 5, 2005

Filed:

Sep 7, 2004

Appl. No.:

10/935694

Inventors:

Jing Chen - San Diego CA, US
Robert Nemiroff - Carlsbad CA, US
Siu-Wai Wu - San Diego CA, US

International Classification:

H04N009/74

US Classification:

386004000

Abstract:

The present invention provides improvements of the rate control method during the transitions at the splice point. In one embodiment, black frames and/or mute audio frames are inserted at the splice point.