Coded data generation or conversion – Digital code to digital code converters – Byte length changed
Patent
1986-12-12
1990-03-06
Shoop, Jr., William M.
Coded data generation or conversion
Digital code to digital code converters
Byte length changed
341 51, 341 87, 324520, H03M 700
Patent
active
049069950
ABSTRACT:
A data compression method and apparatus particularly suitable for use in electrical power line fault data recorders. The system performs both gain compression and frequency compression. For gain compression, a predetermined number of samples are analyzed to determine a gain setting common to each sample in the set of samples. A reduced data string consisting of a gain code and data words having fewer bits than the input words are transmitted as a compressed data string. For frequency compression, a sample set representing the input signal is decimated until there remain only a sufficient number of data samples to satisfy the Nyquist criterion for the highest frequency component of interest. The frequency compressed output data string comprises a frequency code representing the highest frequency of interest followed by the set of decimated data samples.
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Asman Sanford J.
Sangamo Weston, Inc.
Shoop Jr. William M.
Young Brian K.
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