Information transcoding process and a transmission system using such a process
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United States of America Patent
Stats
-
Dec 25, 1984
Grant Date -
N/A
app pub date -
Jul 27, 1981
filing date -
Jul 29, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process and system are provided for transmitting additional information, called order track, superimposed on the information to be transmitted, by alteration of the coding law. The process involves: detection of at least one possible value of the information to be transmitted, for which the coding law is altered depending on the order track information. The first coding is transformed into a second coding by choice of one of several alphabets capable of ensuring such a transformation, this choice being effected depending on the value of the current numerical sum, in accordance with the coding law such that the value of this numerical sum is minimized. the output at one end of the transmission channel of the information is expressed in the second coding as altered by the order track. The information received at the other end of the transmission channel is transformed into information expressed in the first coding. The order track is detected by detection of the alteration in the coding law.
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