Highly-reliable data transmission method and device based on dual tone multiple frequency sound waves

Abstract

The invention discloses highly-reliable data transmission method and device based on dual tone multiple frequency sound waves, wherein the device comprises a sending end which is connected with a sound making device so as to be used for sending sound wave signals, and a receiving end which is connected with a listening device so as to be used for receiving the sound wave signals, the sending end comprises a data generating unit, a dual tone multiple frequency information coding unit and a dual tone multiple frequency sound wave sending unit, and the receiving end comprises a dual tone multiple frequency sound wave receiving unit, a dual tone multiple frequency information decoding unit and a data verifying unit. The method and device provided by the invention has lower requirements on hardware, can carry out data transmission only by arranging a horn and a microphone, can be used on a mobile phone and a computer, and facilitates the realization of application and service fast and with lower cost; when the dual tone multiple frequency information is encoded, the difficult problem that the starting positions of the signals are not easy to look up by adopting a method of comparing and collecting total values after multi-step excursion; and during date generation and data verification, the data consistency can be ensured by adopting verification and an algorithm.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a high-reliability data transmission method and device based on dual-tone 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 comb...

AI Technical Summary

Problems solved by technology

If the traditional DTMF method is directly applied to the audio data communication of the mobile terminal, there are some problems as follows: 1. There is a dial tone that can be heard in the transmission, and the dial tone for a long time will make the user uncomfortable; 2. International The International Telephone and Telegraph Consultative Committee (CCITT) stipulates that a maximum of 10 keys can be pressed per second, that is, the shortest time slot for each key is 100MS, and the actual audio duration is at least 45MS and not greater than 55MS. Keep silent at other times, so when pressing a button to generate dual audio signals, the two consecutive signals are separated by a period of time. This method suitable for hardware decoders is difficult to be processed by mobile terminal software such as mobile phones; 3. After the microphone records, the environment The impact of noise will lead to inaccurate judgment of the silent period; 4. Data verification and error correction are not considered

[0005] If the single-tone multi-frequency sound wave signal is used to transmit data, its disadvantage is that in each time period, a single frequency signal can only represent a value, and the amount of data transmitted per unit is insufficient, resulting in longer data transmission time and more susceptible to environmental noise. and an error occurs

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