Real time date compression method and apparatus for a data recorder

[0030]In the present invention, a real time data compression method applied for a data recorder is disclosed. The compressing processing performed on data is deemed as segment by segment, and further based on the variation extent of the data to determine the compression format. In the compression method, a present read data point is examined to determine whether it is in a tolerable error range, where the tolerable error range is predicted based on a previous data point. According to the examined result, the previous data point is determined to be ignored or not. When the data remains steady or the variation extent is small during a period, the quantity of the recorded data points is accordingly less than that when data is rapidly varied. Thus, based on the amount of the recorded data points, the extent of data variation is obtainable so that the compression format is able to change in real time.

[0031]The real time data compression method for a data recorder that sequentially reads a p