Leung Ping Lee

US Patent:

6411623, Jun 25, 2002

Filed:

Dec 29, 1998

Appl. No.:

09/221864

Inventors:

Leonard DeGollado - Silver Spring MD
Karl J. Kuhn - Haymarket VA
Leung P. Lee - Potomac MD
John Mark Zetts - Falls Church VA

Assignee:

International Business Machines Corp. - Armonk NY

International Classification:

H04L 1226

US Classification:

3703951, 370486, 370241

Abstract:

A switched, digital high-broadband network provides automated control and in-service and out-of-testing of analog video signals, encoded and decoded real time, into MPEG 2 digitized format with a high level of security and protection of content and without attendant degradation of the analog signal sometimes experienced in satellite transmissions. The switch network, typically an asynchronous transfer mode (ATM) network, has multiple gateways for connection to video signal sources and sinks. Each gateway includes an analog/digital video switch for receiving the video signals and distributing them to an MPEG 2 encoder for conversion into digital packets. A multiplexer is coupled to the encoder and a digital switch for inserting the multiplexed signal into the switched ATM network. The multiplexer and the digital switch encode destination address information into the digital packets to ensure proper routing. Each gateway further includes a de-multiplexer and MPEG 2 decoder connected to the digital switch for separating the digital packets from the ATM network into separate MPEG 2 streams subsequently decoded into analog video and returned to the video sinks.

US Patent:

61122238, Aug 29, 2000

Filed:

May 20, 1997

Appl. No.:

8/859550

Inventors:

Henry Dexter Chadwick - Herndon VA
David William Davenport - Raleigh NC
Leonard DeGollado - Silver Spring MD
James William Eldridge - San Jose CA
Michael Joseph Flynn - Palo Alto CA
Roger Lee Haskin - San Jose CA
Leung Ping Lee - Potomac MD
Gregory Allen Poist - Union City CA
Frank Lonnie Stein - Vienna VA
Jeffrey Lloyd Weiner - Austin TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 900

US Classification:

709201

Abstract:

A fault tolerant multimedia program distribution system includes a number of controllers for transmitting instances of predetermined multimedia program information to a communications network at predetermined times, a storage system for storing the multimedia program information, and a multiple access storage control device which allows multiple access to the storage system by more than one distribution controller at any time.