Thomas A Nowak

US Patent:

61541559, Nov 28, 2000

Filed:

Mar 8, 1999

Appl. No.:

9/263579

Inventors:

John Erik Hershey - Ballston Lake NY
Namita Joshi - Schenectady NY
Mark Lewis Grabb - Burnt Hills NY
John Anderson Fergus Ross - Schenectady NY
Thomas Gerard Nowak - Langhorne PA
Vincent Paul Staudinger - Niskayuna NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H03M 740

US Classification:

341 65

Abstract:

A method of coding and compressing telemetry data makes use of the fact that the telemetry frames are typically highly correlated at a distance,. delta. , corresponding to commutation or data periodicities. The existence of such periodicity is used to render a portion of each frame to zeros. The next steps are to search for and remove correlations between the bits in a set of frames, denoted {F. sub. i *}. The compression algorithm implementing the method according to the invention has four sub-steps; Data preconditioning, Compression and coding of first frame, F. sub. 1, Compression and coding of frames 2-. delta. , F. sub. 1 -F. sub. delta. , and Compression and coding of F. sub. delta. +1 and on, the steady-state mode.