Forrest W Edwards from 3701 69Th St, Lubbock, TX 79413, age 73, Phone: 8067880566

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Location:

Portland, Oregon Area

Industry:

Electrical/Electronic Manufacturing

Dithering Apparatus To Properly Represent Aliased Signals For High Speed Signal Sampling
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US Patent:

6388595, May 14, 2002
Filed:

Feb 5, 2001
Appl. No.:

09/777358
Inventors:

Forrest A. Edwards - Wilsonville OR
Eric P. Etheridge - Beaverton OR
Assignee:

Tektronix, Inc. - Beaverton OR
International Classification:

H03M 120
US Classification:

341131, 341139
Abstract:

The subject invention addresses the problem of aliasing in subsampled data by adding dither to the timing of the subsampling of the data. The subject invention solves a speed problem caused by delays in modifying (i. e. , dithering) the A/D converter sampling clock. It is herein recognized that to maintain a high acquisition rate one should randomly select (i. e. , dither) samples after demultiplexing the data into a wider and slower stream of samples, rather than attempting to modify the high speed A/D converter sampling clock.

Architecture Providing Increased Information Display For Long Acquisitions Or Constrained Memory Bandwidth
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US Patent:

6847905, Jan 25, 2005
Filed:

Feb 12, 2003
Appl. No.:

10/366046
Inventors:

Eric P. Etheridge - Beaverton OR, US
Kevin T. Ivers - Woodland WA, US
Forrest A. Edwards - Wilsonville OR, US
Paul M. Gerlach - Beaverton OR, US
Assignee:

Tektronix, Inc. - Beaverton OR
International Classification:

G01R 1300
G06F 1500
US Classification:

702 67, 702 70
Abstract:

A method and apparatus for rasterizing a digital sample stream by producing histograms for each of a plurality of time slices forming a display frame. Time slice histograms for at least one display frame are stored in a circular memory buffer and provided to a display raster for display. The first time slice displayed optionally comprises that time slice temporally associated with a trigger condition.