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Real-time data on-line compression and decompression method

A real-time data and decompression technology, applied in the direction of electrical digital data processing, digital recording/reproduction, instruments, etc., can solve the problems of limited compression ratio, limited compression algorithm, low efficiency, etc., achieve high compression ratio, and realize online compression The effect of storing, flattening and decompressing reads

Active Publication Date: 2005-05-04
ZHEJIANG SUPCON TECH +1
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Problems solved by technology

Moreover, this method compresses data values, and the compressed ratio is very limited.
Therefore, in the existing process control system, the compression algorithm used in its data recording is relatively limited and inefficient

Method used

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  • Real-time data on-line compression and decompression method
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Embodiment Construction

[0047] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0048] see figure 1 , is a block diagram of the overall structure of the present invention. It is a device adopting the real-time data online compression and decompression method described in the present invention, which includes a real-time data reading interface device 11, a real-time data cache device 12, a real-time data compression execution device 13, a real-time process database device 14, a data Inquiry device 15, decompression device 16, data reading device 17;

[0049] The real-time data reading interface device 11 is mainly responsible for the acquisition of data during the operation of the process monitoring system. Read the corresponding tag information list and its data;

[0050] The real-time data cache device 12 is used to temporarily store the bit number information obtained by the real-time data reading interface devic...

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PUM

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Abstract

The invention discloses a real-time data on-line compressing-decompressing method in a course control system and the corresponding file structure. it adopts existing relatively mature compression algorithm, designs a file structure suitable for on-line compression, and is composed of real-time data read interface module, real-time data buffer module, real-time data compression executing module, real-time course database module, data inquiry module, decompression module, and data read module, where the real-time data buffer module contains temporary data file, and the real-time database module contains compression data file and index file. With regard to course real-time data structure, the compressing course of the invention adopts a mode of file group multistage index, has higher compression ratio, and simultaneously implements on-line compression write and gentle decompression read for the real-time data, and thus largely raises history data inquiring efficiency.

Description

technical field [0001] The invention relates to a real-time data processing method, in particular to a real-time data online compression and decompression method and a corresponding file structure in a process control system. Background technique [0002] The data during the operation of the process control system often needs to be recorded for future reference purposes such as process analysis, fault tracing, and control scheme improvement. And the control system needs to run for a long time, so the hard disk space required for storing data files is relatively large, which limits data storage and access. [0003] In order to solve this problem, some existing process control systems also adopt some data compression algorithms, such as the dead zone data method, which is a special case of the LZW compression algorithm, and filters the collected process data according to the predefined dead zone , if the dead zone is defined as 0, it means that if the current value of the tag...

Claims

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Application Information

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IPC IPC(8): G06F12/00G11B20/10H03M7/30
Inventor 张伟盛剑国黄文君
Owner ZHEJIANG SUPCON TECH
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