Data under voice communications system
First Claim
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1. A communications system for communicating data information simultaneously with voice transmission at frequencies less than the voice transmission comprising:
- means for generating at least one digital data signal;
means for generating at least one spreading frequency;
means for combining the data signal and the spreading frequency to create a spreading code for transmission of the data which causes the data to be transmitted at three or more fundamental frequencies; and
means for transmitting the fundamental frequencies simultaneously with the voice transmission, the data being transmitted as a coherent frequency modulated signal having a constantly varying fundamental frequency less than the voice frequency bandwidth.
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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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Citations
40 Claims
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1. A communications system for communicating data information simultaneously with voice transmission at frequencies less than the voice transmission comprising:
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means for generating at least one digital data signal; means for generating at least one spreading frequency; means for combining the data signal and the spreading frequency to create a spreading code for transmission of the data which causes the data to be transmitted at three or more fundamental frequencies; and means for transmitting the fundamental frequencies simultaneously with the voice transmission, the data being transmitted as a coherent frequency modulated signal having a constantly varying fundamental frequency less than the voice frequency bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for communicating data information over a communications medium at frequencies less than voice transmission frequencies comprising:
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generating at least one digital data signal; generating at least one spreading frequency; combining the data signal and spreading frequency to create a spreading code for transmission of the data which causes the data to be transmitted at three or more fundamental frequencies; and transmitting the fundamental frequencies as a coherent frequency modulated signal having a constantly varying fundamental frequency less than the voice frequency bandwidth. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification