JPS60244810A - Memory cassette type data gathering and recording device with automatic interval function - Google Patents

Abstract

PURPOSE:To reproduce data faithful to actual variation while reducing memory capacity and power consumption by compressing and writing a measured value and time data at regular intervals of time and in case of abrupt variation in measured value. CONSTITUTION:Parallel data D and latched by a latch (a) directly and analog data are latched at every sample period through an A/O converter. The difference 3 of the output 1 of the latch (a) from data which is latched in a latch (e) and recorded in a memory cassette last is calculated and when this exceeds a set value D, it is latched as memory cassette recording data. Further, a counter (h) is set with every regular time signal and the frequency of sampling from every regular time is sent as recording data to a control part together with the latched data of the latch (a).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a memory cassette-type data recording device that has an auto-interval function that records data to a memory cassette and automatically changes the recording cycle according to the amount of change in measured values. It is related to the device.

Although the present invention is not limited thereto, for example, when recording river water levels over a long period of time in an unrestricted area,
Usually, most of the information is recorded using self-recording paper, and this method requires a great deal of effort to read data from the self-recording paper. In order to eliminate this problem, digital recording data recording devices are now being used that record measurement data on cassette tapes or semiconductor memory cassettes for the purpose of automatic data input. .

However, in the current digital recording data recording device, the data sampling period is fixed, and in response to sudden changes like the one shown in Figure 1A, sampling every hour on the hour,
This results in a regenerated waveform as shown in Figure 1B. Furthermore, in order to avoid this, if the sampling period is reduced to one-sixth, the result will be as shown in Figure 1C, but the memory capacity used will be six times larger, which will not only increase the memory capacity and power consumption, but also the power consumption of the CPU. This increases the number of batteries, and requires an extremely large battery for long-term measurements, making installation and handling of the device very inconvenient.

The present invention has been made to solve the above problems, and is characterized by compressing measured values and time data and writing them into memory every hour on the hour and when there is a sudden change in measured values. Therefore, the regenerated waveform and memory capacity become as shown in Figure 1D, which is particularly effective when there are few changes.

The circuit configuration will be explained below.

The operation will be explained with reference to FIG.

The n-bit parallel data A is directly converted into digital data, and the analog data B is digitally converted by the A/D converter b, and latched in the n-bit latch a every sample period. The sampling period at this time is determined by the output of the OSC to the set value C by the counter d and the comparator C. Output 1 of latch a is input to a difference calculation circuit f, which calculates the difference 3 between the data recorded in the previous memory cassette latched in e, and when this exceeds the set value D, it is input to comparator g. Therefore, data latch signal 4 is output and latched as data recorded in the memory cassette. At the same time, the request signal 5 is sent to the control section together with the every hour signal output from d. In addition, the counter h counts sampling signals in the time data section and is reset by the signal every hour on the hour, and the number of samplings from every hour on the hour is recorded together with the latch data of a. The data is sent to the control unit as data E. Upon receiving the request, the control section records the data E and date data in the memory cartridge, and also modifies and displays the data in response to an external request.

As explained above, according to the present invention, data is recorded only when there is a change in the measured value that exceeds the set value. Since the data can be reproduced, it is considered to have high utility value in various fields.

[Brief explanation of the drawing]

FIG. 1 shows the regenerated waveform at each sampling period. A. Input waveform B. Regenerated waveform with sampling time of 60 minutes C. Regenerated waveform with sampling time of 6 minutes D. Auto-interval regenerated waveform FIG. 2 shows an auto-interval function circuit configuration diagram. A is digital input, B is analog input, C is sampling cycle setting value, D is recording signal output difference setting value, E is recording data, and each element is all CMO.
Each of the S circuits is composed of an a input buffer, a DA/D converter, a C comparator, a d counter, an e latch, an f difference calculation circuit, a g comparator, and an h counter.

Claims (1)

[Claims] 1 Calculate the difference between the measured data to be recorded and the previous recorded data at each set recording cycle, and when a difference exceeding the set value is detected, the data and time data are
The next data is recorded in the memory cassette, and even if it does not meet the set value, at least the data every hour is recorded, and the time data at this time is set as the recording interval time, and the data is recorded every hour on the hour. A memory cassette-type data recording device having an auto-interval function, characterized in that the number of recording cycle signals from a memory card is recorded in correspondence with the number of recording period signals from the memory cassette-type data recording device.