Superposition of data over voice
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United States of America Patent
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Dec 5, 2006
Issued Date -
N/A
app pub date -
Jan 9, 2004
filing date -
Sep 29, 1998
priority date (Note) -
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Abstract
Method and apparatus for transmitting messages between communication devices via a communication channel allowing at least voice messages to be transmitted, the messages including data subdivided in a sequence of basic data units, the method including: a) encoding the basic data units as unique signals (us.sub.j) including a predetermined number of basic signals (b.sub.i), each basic signal having a unique fixed frequency (f.sub.i); b) transmitting a sequence of unique signals (us.sub.j) during a sequence of fixed time periods (t1, t2, t3, . . . ); c) receiving and decoding the sequence of unique signals (us.sub.j) into the sequence of basic data units; the data being transmitted in superposition over voice.
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