Tektronix, Inc.

Forrest A Edwards

Eric P Etheridge

Paul M Gerlach

Kevin Thomas Ivers

Scott R Ketterer

John W Edwards

Peter D Rosback

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.

Architecture providing increased information display for long acquisitions or constrained memory bandwidth

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.

Dithering apparatus to properly represent aliased signals for high speed signal sampling

Test signal generator

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Wilsonville, OR, United States of America

Forrest A Edwards