Encoding method and device in sub-ultrasonic communication
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A coding method and ultrasonic technology, applied in the field of communication, can solve problems such as bit errors, and achieve the effect of avoiding inaccurate synchronization
Active Publication Date: 2017-10-27
SOUTH CHINA UNIV OF TECH +1
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[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a coding method and device in sub-ultrasonic communication, and solve the problem in the prior art that the same data will be sent continuously due to inaccurate communication synchronization and cause bit errors , which improves the transmission accuracy
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Embodiment 1
[0019] figure 1 It is the coding flowchart of Embodiment 1 of the present invention, such as figure 1 As shown, the encoding method includes:
[0020] S101. Select a plurality of frequency points in the sub-ultrasonic communication frequency band, and set them as 4 kinds of symbols respectively. The 4 kinds of symbols are data synchronization code E, binary data "0", binary data "1" and data repetition code " P";
[0021] The sub-ultrasonic communication frequency band, in the embodiment of the present invention, selects multiple frequency points in the frequency band of 15kHz-20kHz. For the convenience of explanation, in the embodiment of the present invention, the FSK modulation method is used for communication, and 17.5KHz is used to represent binary For the data "0", 19.0KHz is used to represent the data synchronization code E, 18kHz is used to represent the data repetition code "P", and 18.5KHz is used to represent the binary data "1".
[0022] S102. Determine the data...
Embodiment 2
[0032] figure 2 It is a block diagram of the device composition of Embodiment 2 of the present invention, such as figure 2 As shown, the device includes:
[0033] The selection and setting unit 201 is used to select a plurality of frequency points in the sub-ultrasonic communication frequency band, and set them as 4 kinds of symbols respectively, and the 4 kinds of symbols are respectively data synchronization code E, binary data "0", and binary data "1" and data repetition code "P";
[0034] The determining unit 202 is configured to determine the data to be sent, and if the data to be sent has two bits of data that are continuously sent, replace the second bit of data with the data repetition code;
[0035] The encoding transmission unit 203 is used to encode the data to be sent according to the data encoding format, and transmit the encoded data frame to realize the sub-ultrasonic communication. The data encoding format is sequentially the data communication start code, ...
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Abstract
The present invention provides a coding method and device in sub-ultrasonic communication. Multiple frequency points in the sub-ultrasonic communication frequency band are selected and set as 4 kinds of symbols respectively, which are respectively data synchronization code E, binary data "0", binary data " 1" and data repetition code "P"; determine the data to be sent, if there are two consecutive bits of data in the data to be sent, use the data repetition code to replace the second bit of data; encode the data to be sent according to the data Format is encoded, and the encoded data frame is transmitted to realize sub-ultrasonic communication. The data encoding format is sequentially data communication start code, check digit, payload data and data transmission end flag code. The data communication The start code is composed of data synchronization code E and data repetition code P alternately. The invention solves the problem in the prior art that continuous sending of the same data will cause code errors due to inaccurate communication synchronization, and improves the transmission accuracy.
Description
technical field [0001] The invention relates to the field of communication, in particular to a coding method and device in sub-ultrasonic communication. Background technique [0002] Sub-ultrasonic, usually refers to the sound wave with a frequency between 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 and welding. , gravel, sterilization, etc. [0003] In the current sub-ultrasonic communication technology, the problem of inaccurate communication synchronization often occurs, which will lead to the problem of serious bit errors caused by continuous sending of the same data. Contents of the invention [0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a coding method and device in sub-ultrasonic communication, and solve the problem in the pri...
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