Data compression apparatus and method for data recorder
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United States of America Patent
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-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Dec 12, 1986
filing date -
Dec 12, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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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