Data under voice communications system

Details Data under voice communications system Data under voice communications system

H - Electricity

04

M

379/5

H04M 11/06 (2006.01) H04B 1/713 (2006.01) H04J 1/00 (2006.01) H04J 1/14 (2006.01) H04M 11/04 (2006.01)

Patent

CA 1185025

ABSTRACT OF THE INVENTION 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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