Marc S Walker

US Patent:

7710859, May 4, 2010

Filed:

Jun 13, 2003

Appl. No.:

10/518670

Inventors:

Carl L. Christensen - South Jordan UT, US
Marc Stuart Walker - Taylorsville UT, US
David Kim Blair - Taylorsville UT, US
David Lynn Blytheway - Murray UT, US
Lynn Howard Arbuckle - Bountiful UT, US

Assignee:

Thomson Licensing - Boulogne-Billancourt

International Classification:

H04L 12/26

US Classification:

370216, 370244

Abstract:

A fault-tolerant router includes first and second router matrix card. The first and second router matrix cards receive a common set of 4n parity encoded input digital audio data streams and respectively generates therefrom, first and second sets of M output digital audio streams. As the first and second sets of data streams propagate along the first and second router matrix cards, respectively, one or more health bits are set whenever an error or other type of fault condition is detected. First and second parity check circuits are configured to detect parity errors and/or assess the relative health of the first and second sets of data streams and one of the two sets of data streams is selected as the output of the fault-tolerant router based upon either the parity error analysis, health analysis or both.

US Patent:

62851977, Sep 4, 2001

Filed:

Jul 31, 1998

Appl. No.:

9/127329

Inventors:

Marc S. Walker - Taylorsville UT

Assignee:

Philips Electronics North America Corporation - New York NY

International Classification:

G01R 2702
G01R 23175

US Classification:

324603

Abstract:

A jitter unit converts a stable input test signal into a jittering output test signal used to test the jitter tolerance of electronic equipment. This jitter device allows any test or sample signal (analog or digital, video or audio) to be used for testing such equipment. Jitter is a type of timing error between the expected or ideal timing of a signal and the actual timing of a signal in which the characteristics of the timing error change with time. The characteristics of jitter include the level of error, the frequency of change in the error and whether the change is periodic or random. The jitter unit uses a variable delay unit to delay the signal and uses a controller to regulate the delay of the delay unit in order to transform the stable signal into a jittering signal.