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Encoding and decoding methods and system in secondary ultrasonic communication

A technology of ultrasonic and encoding devices, which is applied in the field of communication, can solve the problems of low communication efficiency, and achieve the effect of simple hardware, convenient expansion, and improved communication efficiency

Active Publication Date: 2014-05-28
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide an adaptive encoding and decoding method and system in sub-ultrasonic communication, solve the problem of low communication efficiency due to fixed-length encoding in the prior art, and reduce the Redundancy and data transmission time improve communication efficiency

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  • Encoding and decoding methods and system in secondary ultrasonic communication
  • Encoding and decoding methods and system in secondary ultrasonic communication
  • Encoding and decoding methods and system in secondary ultrasonic communication

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Embodiment 1

[0025] figure 1 It is the coding flowchart of Embodiment 1 of the present invention, such as figure 1 As shown, the encoding method includes:

[0026] S101. The encoding device selects 4 frequency points in the sub-ultrasonic frequency band as 4 kinds of symbols transmitted in communication, and the 4 kinds of symbols are respectively 1 data transmission start code, 1 data transmission end code, binary data 0 and binary data 1;

[0027] Among them, the selected frequency band of the sub-ultrasonic wave is 18.4-19.6KHz, and the selected 4 frequency points can be any frequency point in the interval. In the embodiment of the present invention, for the convenience of description, the 4 frequency points can be 18.31KHz, 18.63KHz , 18.95KHz, 19.27KHz, where 18.63KHz represents the start code of data transmission, 18.95KHz represents the end code of data transmission, 18.31KHz represents binary data 0, and 19.60KHz represents binary data 1.

[0028] It should be noted that, in the...

Embodiment 2

[0056] image 3 It is a system block diagram of Embodiment 2 of the present invention, such as image 3 As shown, the system includes:

[0057] The coding device 301 is used to select 4 frequency points in the sub-ultrasonic frequency band as 4 kinds of symbols transmitted in communication, and the 4 kinds of symbols are respectively 1 data transmission start code, 1 data transmission end code, binary data 0 and Binary data 1, determine the length of the user data bit to be encoded according to the size of the user data, and calculate the check bit, and adaptively synthesize the user data bit and the check bit into data frames of different lengths according to the data frame encoding format, and the described The data frames of different lengths are sent to the decoding device, so that the decoding device performs frame processing according to the encoding format of the data frame to complete the decoding operation;

[0058] It should be noted that, in the embodiment of the ...

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Abstract

The invention provides an encoding method in secondary ultrasonic communication. The encoding method comprises: an encoding device selects four frequency points in a secondary ultrasonic frequency band as four kinds of symbols for transmission in communication, wherein the four kinds of symbols respectively include one data transmission start code, one data transmission end code, binary data 0 and binary data 1; according to the size of user data, a to-be-encoded user data bit length is determined and a check bit is calculated; the user data bit and the check bit are synthesized into data frames with different lengths by a self-adaptive way according to a data frame encoding format; and the data frames with different lengths are sent to a decoding device and thus the decoding device carries out framing processing according to the data frame encoding format so as to complete the decoding operation. Correspondingly, the invention also provides a decoding method and a system. Therefore, a problem of low communication efficiency due to fixed length encoding in the prior art can be solved; the redundancy and data sending time are reduced; and the communication efficiency is improved.

Description

technical field [0001] The invention relates to the field of communication, in particular to a coding and decoding method and system in sub-ultrasonic communication. Background technique [0002] Sub-ultrasonic, usually refers to sound waves with a frequency of 15KHz-20KHz. It has good directionality, strong penetrating ability, easy to obtain concentrated sound energy, and has a long distance in water. It can be used for communication, distance measurement, speed measurement, cleaning, welding, crushing stone, sterilization, etc. [0003] In the current sub-ultrasonic communication technology, most of them use fixed-length coded transmission mode for transmission, which has high redundancy and takes a long time to send data, resulting in low communication efficiency. Contents of the invention [0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide an adaptive encoding and decoding method and system in sub-ultrasonic communi...

Claims

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Application Information

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IPC IPC(8): H04B11/00
Inventor 戚其丰
Owner SOUTH CHINA UNIV OF TECH
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