A method and device for short-distance data transmission based on sound waves

Abstract

The invention relates to a short-distance data transmission method and device based on sound waves. The method comprises the following steps: inputting data to be transmitted; determining the total number of frequency bands and the number of frequency bands to be extracted according to the types of data symbols to be transmitted; making a codebook, and mapping the data symbols to corresponding codewords in the codebook; according to the incoming Code word, synthesized sound wave; play the synthesized sound wave; obtain the played sound wave; extract the sound wave in the target frequency band from the acquired sound wave; map the extracted sound wave, and decode the data symbol through the mapping relationship between the code word and the data symbol ; Perform data connection through the decoded data symbols to obtain continuous data strings. The beneficial effects of the present invention are: realizing high-quality data transmission between devices with pickups and loudspeakers, strong anti-noise performance, strong adaptability to microphone characteristics and speaker characteristics of different devices, simple operation, and high reliability for communication devices Low requirements.

Description

(1) Technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a short-distance data transmission method and device based on sound waves. (2) Background technology [0002] Wired network transmission methods, such as twisted pair, coaxial cable, optical fiber, etc., are reliable and high-speed. However, with the development of miniaturization and mobility of equipment, wireless transmission of information has shown great advantages. For example, in wireless network cameras, smart phones, wearable devices, etc., wireless transmission methods must be used. [0003] Traditional wireless network transmission methods, such as WiFi, Bluetooth, ZigBee, NFC, etc., all require dedicated hardware modules to support, and the cost of transmitting a small amount of data is high, and each communication method has defects: for example, the WiFi method must have a hotspot device, Moreover, during the interaction process, data...

AI Technical Summary

Problems solved by technology

[0003] Traditional wireless network transmission methods, such as WiFi, Bluetooth, ZigBee, NFC, etc., all require dedicated hardware modules to support, and the cost of transmitting a small amount of data is high, and each communication method has defects: for example, the WiFi method must have a hotspot device, Moreover, during the interaction process, data packets can be intercepted in a large area near the hotspot, which poses a security risk; the WiFi direct connection method requires the device to monopolize the WiFi, disconnecting the original WiFi link, and the user experience is poor; the Bluetooth method requires manual search and connection. A series of operations such as confirmation and matching connection, user operations are too complicated during a small amount of data transmission

[0004] In order to supplement the deficiencies of the wired transmission method and the traditional wireless transmission method, a method of transmitting data using sound waves has emerged, but the current sound wave transmission method also has the following defects: the frequency of the sound wave is fixed, and it is generally an ultrasonic frequency band or infrasonic wave that cannot be perceived by the human ear. frequency band; sound wave modulation information has serious frequency leakage, which seriously interferes with the frequency of non-target sound wave bands; sound wave encoding has obvious starting and ending positions, which is not conducive to information protection; the characteristics of speakers on different devices are different, resulting in different degrees of sound waves sent by speakers Distortion and tailing, the existing sound wave transmission scheme does not solve the compatibility problem of speaker characteristics

Although this method reduces the error rate of data restoration, the rate of data transmission is relatively fixed, and the transmission data adopts a definition in binary, quaternary, octal, decimal, or hexadecimal. , the data transmission is not flexible

[0006] The invention patent application with the application number 201210058106.8 and the invention title "Audio or Ultrasonic Based Data Communication Method and System" discloses a sound wave transmission method. By repeatedly sending data packets, superposition and noise removal can be improved to a certain extent. The accuracy of data restoration, but the invention requires that the number of repeated transmissions N be a positive integer and N is greater than 1, which also leads to a low data transmission rate; and the invention needs normalization processing in the process of parsing data, and the threshold value is used to analyze data, the selection of the threshold value directly affects the correctness of the analytical data, and it is difficult to find an optimal threshold value under different equipment and different noise environments

[0007] In addition, the consistency of the speaker sending ability and microphone receiving ability of different devices is different. For example, the sensitivity and reduction of different microphones to different frequency sounds are significantly different, and the frequency response of different speakers is also significantly different. Some speakers may exhibit "frequency tailing"

Therefore, the above method is difficult to guarantee the accuracy of the sending end for the sound wave signals of different frequencies and the accuracy of the receiving end for signal restoration.

Images