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An adaptive real-time lossless compression method for seismic data streams

A lossless compression and adaptive technology, applied in seismic signal processing, code conversion, electrical components, etc., to achieve the effect of eliminating redundancy and good compression performance

Active Publication Date: 2020-04-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only considers single-sampled data, and does not use the correlation between adjacent multi-sampled data to eliminate the redundancy between data, that is, the data can be further compressed

Method used

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  • An adaptive real-time lossless compression method for seismic data streams
  • An adaptive real-time lossless compression method for seismic data streams

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Embodiment Construction

[0023] The compression method in the present invention is carried out in two steps: differential predictive coding and exponential Golomb coding.

[0024] 1. Differential predictive coding:

[0025] Differential encoding, that is, except for the first element, each element is expressed as the difference between each element and the previous element.

[0026] The original data is: X 1 ,X 2 ,...,X n

[0027] The compressed data is: X 1 ,X 2 -X 1 ,...,X n -X n-1

[0028] Second-order difference, that is, to make another difference on the data after difference.

[0029] The original data is: X 1 ,X 2 ,X 3 ,...,X n

[0030] The compressed data is: X 1 ,X 2 -X 1 ,X 3 -2X 2 +X 1 ,...,X n -2X n-1 +X n-2

[0031] The data after the second-order difference is differenced again, and the third-order difference can be obtained, and the data after the third-order difference is made again, and the fourth-order difference can be obtained. By analogy, higher-order dif...

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Abstract

The invention relates to a self-adaptive real-time lossless compression method for seismic data streams. In order to improve the transmission efficiency of a device, when a seismic exploration device carries out collection, self-adaptive real-time lossless compression is carried out on 24-bit seismic data after analog-to-digital conversion. Totally 3n bytes of seismic data for n sample points of a single sample channel are compressed each time. The data compression is carried out according to two steps: N-order differential predictive coding and k-order exponent Golomb coding. Self-adaptive coding is realized by determining the N and the k when the optimum compression is carried out.

Description

technical field [0001] The invention relates to a seismic data compression method, in particular to an adaptive real-time lossless compression method for seismic data streams. Background technique [0002] Seismic exploration instruments usually use 24-bit AD conversion technology to obtain 3-byte signed integer sampling data. The increase in the number of AD conversion bits and the increase in the number of acquisition channels require higher data transmission efficiency. The existing seismic data stream compression method utilizes the distribution law of the data value to re-encode the single sampling data, so as to achieve the purpose of compressing the data. This method only considers the data of a single sampling, and does not use the correlation between adjacent multi-sampled data to eliminate the redundancy between the data, that is, the data can be further compressed. [0003] In fact, the seismic data collected by a single channel over a period of time is similar ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30G01V1/28
CPCG01V1/28H03M7/3002H03M7/3071
Inventor 李可寒宋克柱杨俊峰
Owner UNIV OF SCI & TECH OF CHINA