Fang Wu

US Patent:

7471841, Dec 30, 2008

Filed:

Feb 28, 2005

Appl. No.:

11/069620

Inventors:

Fang Wu - Pleasanton CA, US
Wen-hsiung Chen - Sunnyvale CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06K 9/36
H03M 7/34

US Classification:

382245, 341 51

Abstract:

A method, a carrier medium, and an apparatus to process a plurality of ordered series of quantized coefficients of a block of an image to reduce the amount of data used to represent the image. The method includes establishing a breakpoint along the ordering of the series to define a first contiguous region and a second contiguous region, such that clusters of consecutive signals of non-zero values occur mostly in the first contiguous region. Establishing the breakpoint uses statistics calculated from at least a subset of the plurality, the statistics being of where, along the ordering of the plurality of the series, coefficients of any non-zero value occur in clusters of consecutive non-zero coefficients. For each series in the plurality, the signals in the first region are encoded using a first region encoding method, and the signals in the second region are encoded using a second region encoding method.

US Patent:

7664057, Feb 16, 2010

Filed:

Jul 13, 2004

Appl. No.:

10/890581

Inventors:

Fang Wu - Pleasanton CA, US
Wen-hsiung Chen - Sunnyvale CA, US
Walter R. Friedrich - Pleasanton CA, US
Shantanu Sarkar - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/16
H04Q 11/00
H04L 12/66
H04J 3/16
H04J 3/22
H04J 3/24
H04J 3/06
G06F 15/16

US Classification:

370260, 370270, 370352, 370467, 370471, 370473, 370509, 709204

Abstract:

Synchronizing audio and video streams in packet-based networks requires synchronization of packet timestamps. The present invention provides such synchronization without resort to a network time standard. In one embodiment of the present invention, pairs of timestamp synchronized signals, such as audio and video signals, not having a common timestamp clock are mixed. One of the signals, for example, the audio signals, is mixed first while preserving the original audio timestamps. The preserved timestamp information is then used to synchronize the timestamps of the unmixed signals, in this example the video signals, to provide synchronization of all signals. In another embodiment, the present invention uses packets containing calibration of timestamps to reduce jitter. The present invention also includes specifications for a packet for transmitting timestamp information.

US Patent:

7965771, Jun 21, 2011

Filed:

Feb 27, 2006

Appl. No.:

11/364152

Inventors:

Fang Wu - Pleasanton CA, US
Jack C. Cham - San Leandro CA, US
Michael Pereira - Milpitas CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04N 11/02

US Classification:

37524012

Abstract:

In a packet based multicast video streaming network, a method for minimizing delay in displaying video on a TV set in response to a viewer changing the channel is disclosed. For each live multicast video stream, one or more reference frames and corresponding compressed frames are temporarily stored in a memory in anticipation of the viewer switching to that particular program. When the viewer changes channels, the previously stored reference and compressed frames are immediately read from the memory and rendered for display on the TV. This eliminates the need to wait for the next available reference frame. In other words, this eliminates a temporary blank TV screen each time the channel is changed. Certain compressed frames are dropped and blank frames can be inserted in order to catch up to and synchronize with the live video broadcast. The particular frames to be dropped and the number of blank frames to be inserted is a function of the bandwidth limitation imposed by the last mile of the network.

US Patent:

8462847, Jun 11, 2013

Filed:

Jan 28, 2011

Appl. No.:

13/016773

Inventors:

Fang Wu - Pleasanton CA, US
Jack C. Cham - San Leandro CA, US
Michael Pereira - Milpitas CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04N 7/12

US Classification:

37524012

Abstract:

In a packet based multicast video streaming network, a method for minimizing delay in displaying video on a TV set in response to a viewer changing the channel is disclosed. For each live multicast video stream, one or more reference frames and corresponding compressed frames are temporarily stored in a memory in anticipation of the viewer switching to that particular program. When the viewer changes channels, the previously stored reference and compressed frames are immediately read from the memory and rendered for display on the TV. This eliminates the need to wait for the next available reference frame. In other words, this eliminates a temporary blank TV screen each time the channel is changed. Certain compressed frames are dropped and blank frames can be inserted in order to catch up to and synchronize with the live video broadcast. The particular frames to be dropped and the number of blank frames to be inserted is a function of the bandwidth limitation imposed by the last mile of the network.

US Patent:

8570954, Oct 29, 2013

Filed:

Feb 19, 2008

Appl. No.:

12/033828

Inventors:

Fang Wu - Pleasanton CA, US
Fuyong Zhao - San Jose CA, US
Haiyun Luo - San Jose CA, US

Assignee:

Aruba Networks, Inc. - Sunnyvale CA

International Classification:

H04W 4/00

US Classification:

370329, 370352, 455444, 455450, 4554521

Abstract:

A method and system for QoS provisioning in broadband wireless mesh networks are disclosed. According to one embodiment, a computer-implemented method, comprises providing a dual mode mesh router having a plurality of radios, wherein the mesh router is used in a cell of a plurality of cells that covers a geographic region. The mesh router includes one or more WiMAX backhaul radios, one or more WiFi backhaul radios, one or more WiMAX access radios, one or more WiFi access radios, and three or more intra-mesh radios. Traffic is received at the dual mode mesh router. A minimum quality of service requirement is identified for the traffic. The traffic is routed via the one or more WiMAX backhaul radio when the minimum quality of service meets a predetermined value.