JPH0460204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a storage method for digitally storing and reproducing output waveforms of an analyzer such as a chromatograph.

B. Prior art The output waveform of a chromatograph is the waveform shown in Figure 3. Conventionally, when digitally storing a waveform such as this in which peaks appear here and there on the baseline, all data obtained at fixed time intervals are stored in the same manner. It was memorized using the number of bytes. In the case of a chromatograph, since the output dynamic range is wide, one data requires, for example, 4 bytes, and therefore a large capacity memory is required. However, since this method uses a fixed length for one piece of data, it has the advantage of being able to read data randomly.

C. Problems to be Solved by the Invention The present invention aims to compress the amount of memory used when storing data digitally, and also to enable random data reading.

D. Measures to solve the problem Change the word length depending on the size of the data, store each data with the number of bytes used, and store a certain number of data as one block before and after each block in memory. The total number of bytes included in that block is stored in memory.

E. Operation FIG. 1 shows the configuration of a memory in the system of the present invention. The ranges marked as 1st block, 2nd block, etc. are the data blocks mentioned above. A certain number of data, for example 1000, are stored in one block, and the total number of bytes in that block is written at both the front and back ends of each block. It has been done. The range marked as first data, second data, etc. is the recording structure of each piece of data, and is composed of the number of bytes n1, n2, etc. that make up the data and the data itself. Since the total number of bytes of the first block is written at the beginning of the memory, the length of the first block is immediately known in the memory. By counting the number of bits corresponding to the length of , you can quickly reach the beginning of the second block.
In the same way, you can quickly reach any block. Each block has the total number of bytes written before and after it, so if you are currently reading data from a certain block and then move on to another block,
Instead of returning to the beginning of the first block one by one, it is possible to reach blocks with lower numbers from the block currently being read in the same manner as described above. Since the number of bytes is appended to each piece of data in one block, the specified data can be reached by adding up the number of bytes.

F. Embodiment The embodiment described here is for storing the output waveform of a chromatograph. The chromatographic output is sampled, A/D converted, and integrated over a certain period of time. Conventionally, this accumulated data was stored using a fixed number of bytes. In this embodiment, the above data is not directly stored in memory, but the difference between the previous and subsequent data is taken and stored. The memory uses 1 to 4 bytes depending on the size of the difference. If there is no change in the chromatographic output, the difference is 0, but 1 byte is used even for 0. The differential data is stored in memory along with the number of bytes. Number of bytes is 1~
Since it is 4 bytes, 2 bits are used to store it. One block consists of 1000 pieces of data (differences), and the total number of bytes in that block is stored before and after each block in memory. The number of bytes ranges from a minimum of about 1000 to a maximum of over 4000 bytes, and is stored using 2 bytes.

The data stored in the memory in this way is read out as follows. A buffer memory is prepared, and the contents of an arbitrary block are read into the buffer memory. This block is, for example, the block to which the previously read data belongs. In the buffer memory, each data (in this case, differential data) is restored to normal data by integrating the differential data, and is stored in 4 bytes in total, and of course, data representing the number of bytes for each data is unnecessary. Since each piece of data in the buffer memory has the same number of bytes, any data in a block read into the buffer memory can be accessed immediately regardless of the number of data. If the block stored in the buffer is not the specified block, the specified block can be accessed and read into the buffer. Since each block stores the number of bytes of data in that block before and after it,
As described in the section on operation, the length of each block in the memory can be determined no matter which direction the memory is viewed from, and a specified block can be immediately searched for from a certain block.

FIG. 2 is a flowchart of the operation of the CPU in the above embodiment.

Figure 2A shows a data write operation, and during analysis (represented by blocks), the operations shown by blocks B, C, and D are repeated (the two lines on the right side of the block indicate that a certain operation is being repeated). show). In other words, the operation of importing data is repeated for 1000 data. Since each data is compressed as mentioned above, the number of bytes of 1000 data is added before and after the 1000 data to form one block of data, and then the next Moving on to the block. The above operations are repeated as one unit until the analysis is completed. The operation details of the block are shown in blocks E and F. In the block (h), sampled data is integrated over a certain period of time. The difference between the accumulated data and the previous data is taken and written into memory using 1 to 4 bytes depending on the difference. 1000 movements of E and F are performed. The contents of the operation (e) are shown in blocks (g) and (h). Data is sampled and integrated over a certain period of time.

FIG. 2B shows the operation of reading data stored in memory. A feather-shaped block indicates a conditioned action. First, check whether the buffer memory is empty. If it is not empty (NO), move on to operation 2 and check whether the specified data is in the buffer. If the judgment is YES in action A, the action moves from A to C. In step C, the data of the first block is normalized from the memory and stored in the buffer. Normalization means to restore the original data by sequentially adding the difference data, and to store each data in a buffer as a fixed number of bytes (4 bytes in this embodiment). After completing the movement C, the movement moves to B. If the data specified in operation (b) is in the buffer, the process moves to operation (2), where the data is extracted, and the operation ends. If the specified data does not exist in the buffer (NO), check whether the corresponding block is before or after the block stored in the buffer. If it is before, perform a block search in the memory in the forward direction. If it is later, perform a block search backwards in memory. When a predetermined block is searched, the data of that block is normalized and stored in a buffer, and the operation ends after block 2 and 2.

G. Effects As described above, the present invention stores data in different numbers of bytes depending on its size, so the required memory capacity can be reduced, and even if the number of bytes per piece of data is undefined, Since the number of data is set as one block and the total number of bytes in that block is shown, data can be read by searching for the block to which the read data belongs in block units, and then searching for specified data within that block. , there is no need to read data one by one from the beginning of the memory, and data can be read out at high speed.

[Brief explanation of the drawing]

Figure 1 shows the internal structure of the memory in the method of the present invention, and Figure 2 shows the CPU that executes the method of the present invention.
FIG. 3 is a graph illustrating a waveform to be stored.

Claims (1)

[Claims] 1 The word length of the data is changed according to its size, and it is stored in memory sequentially along with the number of bytes, and the total number of bytes in the block is equalized for each block in the memory, with a certain number of data as one block. A data storage method in which data is written before and after a block, and data is read by searching for the block to which the specified data belongs, and then searching for the specified data within the same block.