Sound wave communication method and system

Sound wave communication method and system

  • CN 105,376,189 A
  • Filed: 09/01/2014
  • Published: 03/02/2016
  • Est. Priority Date: 09/01/2014
  • Status: Active Application
First Claim
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1. a sound wave communication method, comprises step:

  • Transmitting terminal is handled as follows the data cell in data to be sent;

    Check code is set;

    Described data cell is modulated on M carrier wave by pre-arranged code rule, M be more than or equal to 2 positive integer, a described M carrier wave meets the relation of pairwise orthogonal, and in M carrier wave, the absolute value of the frequency-splitting of any two carrier waves is less than or equal to 22kHz;

    Described coding rule comprises phase parameter or range parameter;

    Add synchronous code;

    Add Cyclic Prefix;

    Generate voice signal and send;

    Receiving terminal receives described voice signal, and is handled as follows;

    Analog-to-digital conversion is carried out to the voice signal received, obtains Serial No.;

    Down-converted is carried out to described Serial No.;

    The sequence of complex numbers that down-conversion obtains synchronously is processed;

    Do fast Fourier transform, time-domain signal is obtained to synchronous process the data obtained;

    Carry out reduction treatment to time-domain signal, described reduction treatment comprises channel estimating and channel compensation;

    Carry out phase demodulating process to the signal through reduction, demodulation method is corresponding with the modulator approach that transmitting system adopts;

    Carry out checking treatment to the signal through phase demodulating, method of calibration is corresponding with the check encoding method that transmitting system is arranged;

    Reduction binary sequence obtains raw information.

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