Chowdhary V Musunuri

US Patent:

8102470, Jan 24, 2012

Filed:

Feb 22, 2008

Appl. No.:

12/035637

Inventors:

Chowdhary Musunuri - San Jose CA, US
Richard T. Wales - Sunnyvale CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04N 5/06
H03L 7/00

US Classification:

348521, 348540, 348547

Abstract:

In one embodiment, a method for synchronizing a plurality of video signals received from one or more video sources is provided. The method includes providing one or more video sources and providing a codec including an internal reference oscillator. The method also includes generating a plurality of horizontal and vertical synchronization pulses based on the reference frequency of the internal reference oscillator, generating a composite synchronization pulse based on the plurality of horizontal and vertical synchronization pulses, and transmitting the composite synchronization pulse to the one or more video sources via a communication link. The method further includes separating the composite synchronization pulse back into the plurality of horizontal and vertical synchronization pulses, generating a pixel clock signal for the one or more video sources based on one or more of the plurality of horizontal and vertical synchronization pulses, and genlocking the one or more video sources based on the generated clock signal.

US Patent:

20050060421, Mar 17, 2005

Filed:

Jul 15, 2004

Appl. No.:

10/891078

Inventors:

Chowdhary Musunuri - San Jose CA, US
Raghavan Anand - San Francisco CA, US
Johan Pirot - Fremont CA, US
Rahul Kale - Milpitas CA, US

International Classification:

G06F015/16

US Classification:

709231000

Abstract:

A system and method are disclosed for providing immersive visualization at low bandwidth rates. The system retrieves a frame of multimedia information for transmission over a network and converts the frame from a first color space to a second color space. The system slices the frame into a plurality of frame slices and transforms each of the plurality of frame slices into a plurality of corresponding frequency domain components. The system quantizes the frequency domain components of each frame slice, when the frame slice to be processed is an intra-slice or a refresh slice, to generate quantized frequency domain components of each frame slice. The system variable-length encodes the quantized frequency domain components of each frame slice to generate compressed multimedia information associated with each frame slice. The system constructs network packets of the compressed multimedia information associated with each frame slice, and transmits the network packets via the network.

US Patent:

20080129826, Jun 5, 2008

Filed:

Dec 1, 2006

Appl. No.:

11/565784

Inventors:

Chowdhary Musunuri - San Jose CA, US
Richard T. Wales - Sunnyvale CA, US

International Classification:

H04N 17/00
H04N 11/02

US Classification:

348192, 37524001, 348E17001, 375E07076

Abstract:

A method, an apparatus, and logic for testing a video data path. One method includes sending video data corresponding to a video test pattern to an input port of a video data path; receiving video data at an output port of the video data path; and calculating a function of at least the active part of the received video data. The function is selected such that it has a correct value when the at least the active part of the received video data accurately corresponds to the corresponding part of the sent video data. The method further includes ascertaining whether the function of at least the active part of the received video data has the correct value to ascertain whether or not an error has occurred.

US Patent:

20090109988, Apr 30, 2009

Filed:

Oct 26, 2007

Appl. No.:

11/925013

Inventors:

Chowdhary Musunuri - San Jose CA, US
David J. Mackie - San Jose CA, US
Richard T. Wales - Sunnyvale CA, US
J. William Mauchly - Berwyn PA, US

International Classification:

H04L 12/56

US Classification:

370412

Abstract:

A method, an apparatus, and logic encoded in a computer-readable medium to carry out a method. The method includes receiving packets containing compressed video information, storing the received packets in a buffer memory, timestamping the received packets according to an adjustable clock; and removing packets from the buffer for decoding and playout of the video information, the removing according to playback order and at a time determined by the adjustable clock. The method includes adjusting the adjustable clock from time to time according to a measure the amount of time that the packets reside in the buffer memory, such that time latency caused by the buffer memory is limited. An overrun or an underrun of the buffer memory is unlikely.