Wen Chen Chen

US Patent:

6335990, Jan 1, 2002

Filed:

Dec 4, 1997

Appl. No.:

08/985377

Inventors:

Wen H. Chen - Sunnyvale CA
Ji Zhang - San Jose CA
Fang Wu - San Jose CA

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06T 510

US Classification:

382261, 382265, 382275, 348607, 348608, 348618, 348620, 37524029

Abstract:

A filter that filters in the spatial and temporal domain in a single step with filtering coefficients that can be varied depending upon the complexity of the video and the motion between the adjacent frames comprises: a IIR filter, a threshold unit, and a coefficient register. The IIR filter and threshold unit are coupled to receive video data. The IIR filter is also coupled to the coefficient register and the threshold unit. The IIR filter receives coefficients, a, from the coefficient register and uses them to filter the video data received. The IIR filter filters the data in the vertical, horizontal and temporal dimensions in a single step. The filtered data output by the IIR filter is sent to the threshold unit. The threshold unit compares the absolute value of the difference between the filtered data and the raw video data to a threshold value from the coefficient register, and then outputs either the raw video data or the filtered data. The present invention is advantageous because it preserves significant edges in video sequence; it preserves motion changes in video sequences; it reduces noise; and it uses minimal memory storage and introduces minimal processing delay.

US Patent:

6349096, Feb 19, 2002

Filed:

Sep 22, 1997

Appl. No.:

08/934844

Inventors:

Steve Chen - San Jose CA
Victor Lee - Cupertino CA
Young Way Liu - La Mirada CA
Wen Chi Chen - Los Altos CA

Assignee:

Integrated Telecom Express, Inc. - San Jose CA

International Classification:

H04L 1266

US Classification:

370352, 370238

Abstract:

A system that can be dynamically configured to achieve an optimal routing path for an end-to-end data link connection is disclosed. An optimal data path can be determined by a digital subscriber loop (DSL) user based on particular bandwidth requirements, data rate cost constraints, and/or data delay requirements. The data path can be set up to include one or more data routes, including the regular digital public switching telephone network (PSTN), a wide area networks (WAN), or virtual permanent circuit links via digital cross-connects (DCS).

US Patent:

6500263, Dec 31, 2002

Filed:

Mar 26, 2001

Appl. No.:

09/817786

Inventors:

Yu Chang - San Jose CA
Wen Xiao Chen - Roseville CA

Assignee:

Applied Materials, Inc, - Santa Clara CA

International Classification:

C23C 16000

US Classification:

118715, 118707, 118733, 42725528

Abstract:

Multiple levels of interlocks are provided relative to gas flow for a chemical vapor deposition chamber. When a chamber lid used for normal processing is in place, no interlock is in effect. When a lid used during maintenance operations is in place, flow of toxic gas to the chamber is interlocked, but flow of purge gas is permitted. When no lid is in place, all gas flow to the chamber is interlocked. The interlock arrangement may be implemented with two switches, both of which are actuated when the lid for normal processing is in place, and only one of which is actuated by the lid for the maintenance process.

US Patent:

6891854, May 10, 2005

Filed:

Dec 19, 2000

Appl. No.:

09/741451

Inventors:

Ji Zhang - San Jose CA, US
Wen H. Chen - Sunnyvale CA, US
Fang Wu - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04J003/16
H04N011/04
H04N007/12

US Classification:

370468, 370538, 37524001, 3483841, 3483901

Abstract:

Digitally compressed video/audio bit streams, when transmitted over digital communication channels such as digital subscriber loop (DSL) access networks, ATM networks, satellite, or wireless digital transmission facilities, can be corrupted due to lack of sufficient channel bandwidth. This invention describes schemes to ensure lossless transmission of bit streams containing pre-compressed video signals within the communication channels. The schemes herein comprises a rate conversion system that converts the bit rate of a pre-compressed video bit stream from one bit rate to another, and that is integrated with a digital communication channel, and to convey the maximum channel transmission rate to the rate conversion system to allow satisfactory transmission of the bit stream from the input of the rate converter through the transmission facility.

US Patent:

7072331, Jul 4, 2006

Filed:

Nov 13, 2001

Appl. No.:

09/991285

Inventors:

Steve Chen - San Jose CA, US
Victor Lee - Cupertino CA, US
Young Way Liu - La Mirada CA, US
Wen Chi Chen - Los Altos CA, US

Assignee:

Real Communications, Inc. - San Jose CA

International Classification:

H04L 12/66

US Classification:

370352, 370524, 370536

Abstract:

A system that can be dynamically configured to achieve an optimal routing path for an end-to-end data link connection is disclosed. An optimal data path can be determined by a digital subscriber loop (DSL) user based on particular bandwidth requirements, data rate cost constraints, and/or data delay requirements. The data path can be set up to include one or more data routes, including the regular digital public switching telephone network (PSTN), a wide area networks (WAN), or virtual permanent circuit links via digital cross-connects (DCS).

US Patent:

7206281, Apr 17, 2007

Filed:

May 3, 2002

Appl. No.:

10/138853

Inventors:

Wen Chen - San Jose CA, US
Xin Li - Santa Clara CA, US
Makarand S. Bhatambarekar - San Jose CA, US

Assignee:

Ciena Corporation - Linthicum MD

International Classification:

G01R 31/08

US Classification:

370222, 3702381

Abstract:

A system operating on a communication network for mapping service-level information comprising logical connections to physical-level information comprising working physical paths of the logical connections, where the physical-level information is obscured by activation of protect schemes within the communication network.

US Patent:

7283466, Oct 16, 2007

Filed:

Oct 25, 2002

Appl. No.:

10/280896

Inventors:

Wen Chen - San Jose CA, US
Xin Li - San Jose CA, US
Makarand Bhatambarekar - San Jose CA, US

Assignee:

Ciena Corporation - Linthicum MD

International Classification:

G01R 31/08

US Classification:

370225, 370242

Abstract:

A method and system for tracking physical route changes in an optical switching network. One embodiment comprises a method for detecting changes in physical routes of connections within an optical switching network. The method includes receiving an event message from a node of the optical switching network where the event message relates to an event at the node, applying a filtering function to the event message to determine whether the event message may be ignored, ignoring the event message if the event message does not pass the filtering function, and processing the event message if the event message passes the filtering function.

US Patent:

7505480, Mar 17, 2009

Filed:

Jun 22, 2004

Appl. No.:

10/874893

Inventors:

Ji Zhang - San Jose CA, US
Wen H. Chen - Sunnyvale CA, US
Fang Wu - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04J 3/16
H04L 12/28
H04L 5/16

US Classification:

370465, 370235, 370352, 370538, 375222, 37524001, 375 E7198

Abstract:

Digitally compressed video/audio bit streams, when transmitted over digital communication channels such as digital subscriber loop (DSL) access networks, ATM networks, satellite, or wireless digital transmission facilities, can be corrupted due to lack of sufficient channel bandwidth. This invention describes schemes to ensure lossless transmission of bit streams containing pre-compressed video signals within the communication channels. The schemes herein comprises a rate conversion system that converts the bit rate of a pre-compressed video bit stream from one bit rate to another, and that is integrated with a digital communication channel, and a means to convey the maximum channel transmission rate to the rate conversion system to allow satisfactory transmission of the bit stream from the input of the rate converter through the transmission facility.