Coding method and apparatus in secondary ultrasonic communication
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A coding method, 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: 2014-05-28
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 invention provides a coding method and apparatus in secondary ultrasonic communication. A plurality of frequency points in a secondary ultrasonic communication frequency band and four kinds of symbols are respectively set, wherein the four kinds of symbols respectively are a data synchronous code E, binary data "0", binary data "1", and a data repetition code "P"; to-be-sent data are determined and if two bits of identical data for continuous sending exit in the to-be-sent data, the data repetition code is used for replacing the second-bit data; the to-be-sent data are coded according to a data coding format and data frames after coding are transmitted, thereby realizing secondary ultrasonic communication. Besides, the data coding format successively includes a data communication start code, a check code, net load data, and a data transmission end mark code; and the data communication start code is formed by synthesis of the data synchronous code E and the data repetition code P. According to the invention, a problem that an error code occurs due to identical data continuous sending caused by inaccurate communication synchronization in the prior art can be solved; and the transmission accuracy rate can be improved.
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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Application Information
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