Data compression system
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United States of America Patent
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May 7, 1985
Grant Date -
N/A
app pub date -
Feb 26, 1982
filing date -
Feb 26, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A character base input data stream is encoded in compressed form by using a histogram of a sample of the data stream to determine the frequency of appearance of characters in the stream. A code for a character M+1 is generated in an encoder (112) to be of a length which is an inverse function of the frequency of appearance of character M+1 in the preceding M characters in the sample. Decoding can be achieved by forming a comparable sample window in a decoder (118) to which is applied an estimated index of the incoming character being decoded.
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