Multi-channel sound wave communication system and method

Abstract

The invention relates to a multi-channel sound wave communication system and method. Effective information can not be transmitted by purely using an ultrasonic wave frequency characteristic, and less frequency points exist. The information is transmitted by using amplitude modulation, and error rate is high. The multi-channel sound wave communication system comprises a sound wave information generator and a sound wave information receiver, wherein the sound wave information generator comprises a first microphone, a first analog to digital conversion module, a channel selection module, a DDS (Direct Digital Synthesizer) carrier generation module, an FSK (Frequency Shift Keying) modulation module, a code element information storage module, a coding module, a first clock module, a digital to analog conversion module, an analog filter module, an amplifier module and a speaker. The sound wave information receiver comprises a second microphone, a second analog to digital conversion module, a digital down converter module, a digital filter module, a down-sampling module, an automatic gain control module, a synchronous decision module and a second clock management module. The multi-channel sound wave communication system has a simple structure, and avoids that each path of traditional FSK demodulation is subjected to a large quantity of digital signal processing operation.

Description

technical field [0001] The invention relates to the technical field of communication, and in particular to a system and method for realizing information transmission between multiple devices, information reception and restoration, and multi-channel coexistence to prevent carrier conflict based on sound waves. Background technique [0002] With the commercialization of GSM digital mobile communication technology, mobile terminal equipment represented by mobile phones has become an essential tool for people's life, and on the basis of completing basic call functions, in recent years, technologies such as Bluetooth and NFC near field communication have been added to realize indoor precision. Positioning and mobile payment and many other functions. These basic functions are realized based on electromagnetic waves as the basic transmission medium, which require special hardware and equipment, and are expensive to implement. [0003] Different from the information transmissio...

AI Technical Summary

Problems solved by technology

In the invention patent CN102202258.A with an application date of May 4, 2011, effective information cannot be transmitted simply by using ultrasonic frequency characteristics, and there are few frequency points; in the invention patent CN101247183A with an application date of February 15, 2007, the Modulation transmits information, there is a high bit error rate, and there is no effective mechanism for disclosing carrier anti-collision

In conclusion, the practicality of existing solutions is insufficient

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