Edward E Krause

US Patent:

52413829, Aug 31, 1993

Filed:

Apr 25, 1992

Appl. No.:

7/871996

Inventors:

Woo H. Paik - Encinitas CA
Vincent Liu - San Gabriel CA
Paul Shen - San Diego CA
Edward A. Krause - San Diego CA

Assignee:

General Instrument Corporation - Hatboro PA

International Classification:

H04N 712
H04N 1104

US Classification:

358133

Abstract:

A macroblock packet format is provided for use in a digital HDTV system wherein successive video frames are divided into a plurality of macroblocks. The macroblocks comprise a plurality of superblocks, each containing a plurality of luminance and chrominance video data blocks. A DLEN field is provided in the macroblock packet format to identify the length of the macroblock packet. The packets also include variable length encoded portions of video data. The macroblock packets are transmitted in a data multiplex that also includes a next macroblock position (NMP) word. A receiver compares the DLEN information with the NMP word to verify synchronization, and reacquires the signal if synchronization has been lost.

US Patent:

52912817, Mar 1, 1994

Filed:

Jun 18, 1992

Appl. No.:

7/900904

Inventors:

Woo H. Paik - Encinitas CA
Edward A. Krause - San Diego CA
Vincent Liu - San Gabriel CA

Assignee:

General Instrument Corporation - Hatboro PA

International Classification:

H04N 7133

US Classification:

348384

Abstract:

An apparatus and method for adaptively compressing blocks of video image data provide a local coding level for use in compressing successive blocks of video image data. Each block is preliminarily compressed using a global coding level. The preliminarily compressed data is processed to provide a measure of the randomness of an image area represented by the block of video image data. A local coding level is generated based on the randomness measure. The video image data is then compressed using the local coding level to provide compressed data for transmission. One or more intermediate compression stages can be provided, each generating an intermediate coding level, to better refine the randomness measure for use in generating the local coding level.

US Patent:

53217250, Jun 14, 1994

Filed:

Jul 10, 1992

Appl. No.:

7/908407

Inventors:

Woo H. Paik - Encinitas CA
Scott A. Lery - Leucadia CA
Chris Heegard - Ithaca NY
Edward A. Krause - San Diego CA
Jerrold A. Heller - Del Mar CA

Assignee:

General Instrument Corporation - Hatboro PA

International Classification:

H04L 512

US Classification:

375 39

Abstract:

A method and apparatus for communicating high definition television signals is provided. Video signals are divided into blocks of PCM data. The PCM data is processed using motion estimation and compensation to provide DPCM data. For each block, one of PCM and DPCM data is selected for transmission based on a predetermined criteria. The selected data is compressed using the discrete cosine transform to provide blocks of transform coefficients. The coefficients are quantized to improve their coding efficiency and variable length coded. The variable length coded coefficients are coded using a concatenated coding scheme with a Reed-Solomon outer code and trellis inner code to provide coded signals for transmission. The coded signals are transmitted using QAM.

US Patent:

52165035, Jun 1, 1993

Filed:

Dec 24, 1991

Appl. No.:

7/809561

Inventors:

Woo H. Paik - Encinitas CA
Edward A. Krause - San Diego CA
Vincent Liu - San Gabriel CA
Paul Shen - San Diego CA
Henry Derovanessian - La Jolla CA

Assignee:

General Instrument Corporation - Hatboro PA

International Classification:

H04N 712

US Classification:

358133

Abstract:

A multichannel image compression system uses a plurality of encoders to compress image data. A coding level command is provided to each of the encoders to specify a level of quality to be provided by each encoder. Encoded image data, provided by the encoders in response to the coding level command, is multiplexed into a combined signal for transmission. The coding level command is adjusted in response to an accumulated amount of data from the combined signal, to maintain the accumulated data within a throughput capability of a communication channel. Although the coding level command may specify a global coding level that is the same for all of the encoders, the encoders can derive local coding levels from the global coding level to provide different encoding qualities. Decoder apparatus is provided to recover an image from the compressed image data.

US Patent:

56872577, Nov 11, 1997

Filed:

Nov 9, 1994

Appl. No.:

8/336801

Inventors:

Woo H. Paik - Encinitas CA
Edward A. Krause - San Diego CA
Vincent Liu - San Gabriel CA

Assignee:

General Instrument Corporation - Hatboro PA

International Classification:

G06K 936

US Classification:

382239

Abstract:

An apparatus and method for adaptively compressing blocks of video image data provide a local coding level for use in compressing successive blocks of video image data. Each block is preliminarily compressed using a global coding level. The preliminarily compressed data is processed to provide a measure of the randomness of an image area represented by the block of video image data. A local coding level is generated based on the randomness measure. The video image data is then compressed using the local coding level to provide compressed data for transmission. One or more intermediate compression stages can be provided, each generating an intermediate coding level, to better refine the randomness measure for use in generating the local coding level.