Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1988-05-31
1991-06-25
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
341 65, 381 31, H04B 166
Patent
active
050273760
ABSTRACT:
Disclosed is a data compressing modem for connection to a decompressing modem over communication lines. The compressing modem receives an input data stream, and each character in the data stream is recodified with a compressed character code, the length of which is dependent on the frequency of the character in the data stream. A frequency table is maintained so that changes in the relative frequency of characters in the data stream will be recognized by the compressing modem and the compressed character codes representing such characters will be exchanged accordingly. A decompressing modem, which is connected over communication lines to the compressing modem, processes the compressed character code in a reverse order from the manner in which the compresing modem processing the codes. The decompressing modem also maintains a relative frequency table and as the relative frequencies of the various characters change, the actual characters represented by the compression codes must also change.
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Friedman Paul
Melhorn Nathan
Microcom Systems, Inc.
Safourek Benedict V.
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