Data under voice communications system
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United States of America Patent
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Jan 10, 1984
Grant Date -
N/A
app pub date -
Sep 3, 1981
filing date -
Sep 3, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A communications system capable of simultaneously transmitting voice and data information. The spectral energy of the data signal is smeared by spreading it in a spectrum with energy packed in the lower frequency range under the conventional voice signal frequency in a manner which complements the standard C-message weighting curve. The use of the spread spectrum technique also eliminates thumping at the data rate since the harmonics that produce thumping are also spread throughout the bandwidth.
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