A high-reliability data transmission method and device based on multi-frequency sound waves

Abstract

The invention discloses a high-reliability data transmission method and device based on multi-frequency sound waves. The device comprises a transmitting end which is connected with a sound-producing device for transmitting a sound wave signal, and a receiving end which is connected with a receiving device for receiving the sound wave signal, wherein the transmitting end comprises a data coding unit and a multi-frequency sound wave transmitting unit; and the receiving end comprises a data decoding unit and a multi-frequency sound wave receiving unit. The high-reliability data transmission method and the device based on multi-frequency sound waves provided by the invention have low hardware requirements, data transmission can be performed by only arranging a loudspeaker and a microphone, the method and the device can be applied to mobile phones and computers, and quick realization of application and services at low cost is facilitated; and during data decoding, a probability sequence is referred, and a calibration method is adopted, so that the hit rate and accuracy of data are increased effectively.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a high-reliability data transmission method and device based on multi-frequency sound waves. Background technique [0002] At present, there are many communication methods between mobile phones or between mobile phones and computers, including Bluetooth, wireless network and other near-field communication methods, but these communication methods have high and specific requirements for hardware configuration, and the process of establishing communication is relatively cumbersome. The cost of software and hardware is high, and the coverage is narrow, which is not convenient for on-site payment by mobile phone, private data transfer between mobile phones and other data transmissions that require high reliability of data transmission. [0003] The patent application with the publication number CN101247183A discloses a method for realizing ultrasonic communication by combining a hi...

AI Technical Summary

Problems solved by technology

However, when using ultrasonic waves for data communication, the sound frequency range of the speakers and microphones equipped with mobile phones and computers is narrow, the sensitivity is limited, and affected by environmental noise, sound wave distortion is prone to occur, resulting in too high an error rate during data transmission, which cannot be achieved. Practical Requirements for High Reliability Data Transmission

The method disclosed in this patent application adopts binary coded data, and the amount of information transmitted per unit of data is small. When a large amount of data is transmitted, the probability of waveform distortion is high; the judgment of "0" and "1" values ​​is simple through the level High and low decision, when the influence of environmental noise is great, the distortion rate of the high and low level value is high, the threshold value of the high and low level boundary changes greatly with the environmental influence, and cannot be set accurately; when there is an error in the judgment of a certain data, it cannot be verified and corrected Wrong, a single error can cause the entire message to be wrong; the physical structure of mobile phones and computers has been solidified when they leave the factory, and the cost of remodeling the circuit during application is too high

This method is difficult to meet the practical requirements of mobile phones and computers for high-reliability data transmission.

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