SYSTEM AND METHOD FOR SPREAD SPECTRUM ACOUSTIC COMMUNICATION
First Claim
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1. A method of communicating using acoustic signals, comprising the steps of:
- generating a pseudorandom noise signal;
modulating an input signal by said pseudorandom noise signal, thereby generating a direct-sequence spread spectrum signal;
generating in a transmission medium an acoustic wave corresponding to said direct-sequence spread spectrum signal.
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Abstract
Systems and methods for communicating with acoustic signals and, more particularly, systems and methods for communicating using direct-sequence spread spectrum acoustic waves generated by non-impulsive sources. A data signal is modulated by a pseudorandom noise signal and the modulated spread spectrum signal is coupled to a transmission medium for propagation of an acoustic wave through the medium. Acoustic signals are received from the medium and are possessed to obtain a transmitted data signal.
10 Citations
31 Claims
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1. A method of communicating using acoustic signals, comprising the steps of:
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generating a pseudorandom noise signal; modulating an input signal by said pseudorandom noise signal, thereby generating a direct-sequence spread spectrum signal; generating in a transmission medium an acoustic wave corresponding to said direct-sequence spread spectrum signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of communication using acoustic signals, comprising the steps of:
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receiving an acoustic signal from a transmission medium; obtaining a pseudorandom noise signal; and demodulating said acoustic signal by said pseudorandom noise signal, thereby obtaining a data signal. - View Dependent Claims (9, 10, 11, 12, 13, 31)
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14. A system for communicating using acoustic signals, comprising:
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a noise generator configured to generate a pseudorandom noise signal; a signal modulator configured to modulate an input signal by said pseudorandom noise signal, thereby generating a direct-sequence spread spectrum signal; a transmit transducer configured to receive said direct-sequence spread spectrum signal, mechanically couple said direct-sequence spread spectrum signal to a transmission medium, and generate in the transmission medium an acoustic wave corresponding to said direct-sequence spread spectrum signal; a receive transducer configured to receive said acoustic signal from said transmission medium generated by interaction between said acoustic wave and the transmission medium and convert said acoustic signal to electronic signals; and a signal demodulator configured to receive from said receive transducer said electronic signal and demodulate said electronic signal by said pseudorandom noise signal, thereby obtaining said data signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A computer program product for communicating using acoustic signals, said computer program product comprising a digital storage medium and a set of machine readable instructions stored on said digital storage medium, wherein said instructions are executable by a computer to:
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generate a pseudorandom noise signal; modulate an input signal by said pseudorandom noise signal, thereby generating a direct-sequence spread spectrum signal; and transmit said direct-sequence spread spectrum signal to a transmit transducer mechanically coupled to a transmission medium. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A computer program product for communicating using acoustic signals, said computer program product comprising a digital storage medium and a set of machine readable instructions stored on said digital storage medium, wherein said instructions are executable by a computer to:
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receive from a receive transducer mechanically coupled to a transmission medium an acoustic signal; obtain a pseudorandom noise signal; and demodulate said acoustic signal by said pseudorandom noise signal, thereby obtaining a data signal. - View Dependent Claims (28, 29, 30)
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Specification