Method and device for storing historical trend data in limited memory space

Abstract

The invention discloses a method and device for storing historical trend data in limited memory space. The method comprises the steps of judging, subtracting, comparing, and deleting. In the judging step, judgment is made to the remained space of the memory. In the subtracting step, when the result in the judging step is negative, subtraction is done in a manner that all the data in the memory space minus the adjacent data respectively to get the difference value, wherein the adjacent data is the data which is adjacent when the data storage occurs. In the step of comparing, comparison is made between all the difference values to acquire the smallest difference value. In the step of deleting, one of two mutually adjacent data corresponding to the smallest difference value is deleted, thus leaving space for storage. According to the method, when the memory space is determined to be inadequate, through the deletion of either one of the two mutually adjacent data corresponding to the smallest difference value, memory space can be vacated for storing new data, at the same time the data variation trend in the memory space can be preserved to the maximum.

Description

technical field [0001] The present application relates to the field of data storage, in particular to a method and device for storing historical trend data in a limited storage space. Background technique [0002] When measuring signals in engineering, it is often necessary to monitor the signal for a long time and focus on observing the trend of the signal. When the monitoring time is long and the memory of the measuring device is full, the measuring device will generally automatically delete the oldest historical data to make room for new data. Out of storage space. However, this approach in the prior art will make the data stored in the measuring device unable to reflect the changing trend of the monitoring signal well. For example, when an engineer uses an oscilloscope to observe a signal for a long time, when the storage space of the oscilloscope is full, in the prior art, the oscilloscope will automatically delete the oldest historical observation data to make room fo...

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Problems solved by technology

However, this approach in the prior art will make the data stored in the measuring equipment unable to reflect the changing trend of the monitoring signal well

For example, when an engineer uses an oscilloscope to observe a signal for a long time, when the storage space of the oscilloscope is full, in the prior art, the oscilloscope will automatically delete the oldest historical observation data to make room for new data. This undoubtedly cannot completely preserve the overall change trend of the observed signal, which makes the focus of the engineer's observation of the overall change trend of the signal seriously distorted and damaged

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