Serafim S Loukas

20070201388, Aug 30, 2007

Jan 30, 2007

11/700367

Devarshi Shah - San Diego CA, US
Binita Gupta - La Jolla CA, US
Scott Swazey - San Diego CA, US
Robert Daley - Del Mar CA, US
Sten Dahl - San Diego CA, US
Thadi Nagaraj - San Diego CA, US
Vinod Kaushik - San Diego CA, US
Serafim Loukas - Carlsbad CA, US
Vijayalakshmi Raveendran - San Diego CA, US
Bruce Collins - San Diego CA, US

QUALCOMM Incorporated - San Diego CA

H04L 5/22
H04L 27/04

370300000

In general, this disclosure describes techniques for exchanging information between a plurality of encoder modules and a multiplex module to combine segments of data from the encoder modules with an improved overall quality. In particular, the encoder modules associate their respective segments of data with quality and rate information and send at least the quality and rate information associated with the segments of data to the multiplex module. The multiplex module analyzes the quality and rate information to determine whether the segments of data that encoder modules desire to include in the current superframe fit within the available bandwidth of a transmission channel. If the multiplex module determines the plurality of segments of data do not fit within the available bandwidth, the multiplex module selects one or more of the segments to be resized based on the quality and rate information received from the encoder modules.

20070274340, Nov 29, 2007

Jan 30, 2007

11/700369

Vijayalakshmi Raveendran - San Diego CA, US
Gordon Walker - San Diego CA, US
Binita Gupta - La Jolla CA, US
Phanikumar Bhamidipati - San Diego CA, US
Bruce Collins - San Diego CA, US
Devarshi Shah - San Diego CA, US
Robert Daley - Del Mar CA, US
Sten Dahl - San Diego CA, US
Serafim Loukas - Carlsbad CA, US
Bharat Ahuja - Longmont CO, US
Thadi Nagaraj - San Diego CA, US
Vinod Kaushik - San Diego CA, US
Prasanna Kannan - San Diego CA, US

QUALCOMM Incorporated - San Diego CA

H04J 3/16

370468000, 375240010, 375E07126

In general, this disclosure describes techniques for exchanging information between a plurality of encoder modules and a multiplex module to combine segments of data from the encoder modules with an improved overall quality. In particular, the encoder modules associate their respective segments of data with quality and rate information and send at least the quality and rate information associated with the segments of data to the multiplex module. The multiplex module analyzes the quality and rate information to determine whether the segments of data that encoder modules desire to include in the current superframe fit within the available bandwidth of a transmission channel. If the multiplex module determines the plurality of segments of data do not fit within the available bandwidth, the multiplex module selects one or more of the segments to be resized based on the quality and rate information received from the encoder modules.

20080127258, May 29, 2008

Nov 15, 2007

11/941014

Gordon Kent Walker - Poway CA, US
Vijayalakshmi R. Raveendran - San Diego CA, US
Serafim S. Loukas - Carlsbad CA, US
Seyfullah Halit Oguz - San Diego CA, US
Fang Shi - San Diego CA, US
Sitaraman Ganapathy Subramania - San Diego CA, US
Phanikumar Bhamidipati - San Diego CA, US
James T. Determan - Encinitas CA, US

QUALCOMM INCORPORATED - San Diego CA

H04N 5/445

725 39

Techniques for video encoding and decoding a common guide media logic channel (MLC) to enable fast acquisition and re/synchronization of the video stream while preserving compression efficiency are provided. Systems and methods to process multimedia data using channel switch frames are presented. The system comprises an encoder operative to generate a common guide media logical channel (MLC) of a plurality of channel switch frames (CSFs), each respective active channel having one or more CSFs in the guide MLC. The decoder in the system is operative to decode a set of the plurality of CSFs from the guide MLC. The decoder simultaneously displays programming content of the decoded set of the plurality of CSFs on a display and automatically switches to a primary bitstream of an active channel associated with a selected one displayed CSF.

20080130755, Jun 5, 2008

Nov 2, 2006

11/555989

Serafim S. Loukas - Carlsbad CA, US
Tao Tian - San Diego CA, US
Vijayalakshmi R. Raveendran - San Diego CA, US

QUALCOMM INCORPORATED - San Diego CA

H04N 7/26

37524024, 37524026, 375E07026

Aspects include systems and methods of improving processing in an encoder in a multimedia transmission system. Multimedia data may include one or more of motion video, audio, still images, or any other suitable type of audio-visual data. Aspects include an apparatus and method of encoding video data. For example, an apparatus and method of reduced reference frame search in video encoding is disclosed.

20080170564, Jul 17, 2008

Nov 14, 2007

11/940122

Fang Shi - San Diego CA, US
Christopher John Bennett - San Diego CA, US
Serafim S. Loukas - Carlsbad CA, US
Brian William Orr - San Diego CA, US
Vijayalakshmi R. Raveendran - San Diego CA, US
Scott T. Swazey - San Diego CA, US
Amnon Silberger - San Diego CA, US
Thadi M. Nagaraj - San Diego CA, US
Gordon Kent Walker - Poway CA, US
David Brackman - San Diego CA, US
Fang Liu - San Diego CA, US
Sumeet Singh Sethi - San Diego CA, US
Ramkumar Sampathkumar - San Diego CA, US

QUALCOMM INCORPORATED - San Diego CA

H04Q 11/00
H04L 12/50

370386

Techniques for video encoding and decoding channel switch frames (CSF) to enable acquisition and re/synchronization of the video stream while preserving compression efficiency is provided. Systems and methods to process multimedia data enabling channel switching are presented. The systems generate a CSF with one or more network adaptation layer (NAL) units as a random access point (RAP) frame. Back-to-back frames are transmitted which include the CSF and a non-RAP frame, each having the same frame ID number.

20080212690, Sep 4, 2008

Dec 20, 2007

11/961955

Serafim S. Loukas - Carlsbad CA, US

QUALCOMM INCORPORATED - San Diego CA

H04N 7/26

37524028, 375E07198

In general, this disclosure describes techniques of compensating for differences between a clock associated with an input stream of media data and a clock associated with an output stream of media data. Due to drift between a clock that governs the rate at which a transcoder receives media data units (“MDUs”) and a clock that governs the rate at which the transcoder outputs MDUs, the transcoder may receive MDUs at a rate that is faster or slower than a rate at which the transcoder outputs the MDUs. The transcoder compensates for such differences by identifying sets of received MDUs that account for a time equal to an output period minus a correction magnitude, modifying the identified sets of MDUs such that the sets of MDUs account for a time equal to the output period, and outputting the modified sets of MDUs as part of the output stream.

20080260042, Oct 23, 2008

Apr 23, 2007

11/739075

Devarshi Shah - San Diego CA, US
Phanikumar Bhamidipati - San Diego CA, US
Vinod Kaushik - San Diego CA, US
Serafim S. Loukas - Carlsbad CA, US

QUALCOMM INCORPORATED - San Diego CA

H04N 7/52

37524025, 375E07016

This disclosure describes techniques for controlling a perceived quality of multimedia sequences to try to achieve a desired constant perceptual quality regardless of the content of the sequences. In particular, an encoding device may implement quality control techniques to associate a sequence segment with a content “class” based on the content of the segment, determine a perceptual quality metric of the sequence segment, and adjust at least one encoding parameter used to encode the segment is encoded such that for the perceptual quality of the sequence segment converges to the desired quality.

20060268841, Nov 30, 2006

May 15, 2006

11/435050

Thadi Nagaraj - San Diego CA, US
Bruce Collins - San Diego CA, US
Amnon Silberger - La Jolla CA, US
Gordon Walker - Poway CA, US
Serafim Loukas - Carlsbad CA, US
Vijayalakshmi Raveendran - San Diego CA, US

H04L 12/66

370352000

A method and apparatus to improve error resiliency in processing a multimedia bitstream is described. A directory of header information is generated for a multimedia bitstream. The directory information comprises packet header information associated with the multimedia bitstream. The directory information may be transmitted to a receiver along with the multimedia bitstream. A receiver of the multimedia bitstream and the directory can utilize the header information to identify and locate packets within and subsequent to erroneous data in the received bitstream. By identifying and locating packets that may otherwise be discarded, the receiver may be able to improve error recovery and decoding of the multimedia data.