JPS61244000A - Data storage device - Google Patents

Abstract

PURPOSE:To store efficiently data for many hours by changing a storage period in accordance with a state of a signal which has been converted digitally, and storing it together with time data. CONSTITUTION:As for a signal passing through an A/D converter 3, the storage period is prolonged in case when the signal is scarcely varied, by processing using a CPU4 corresponding to a setting means 5 for setting a storage state. Also, a signal of a small number of samplings, and time data of a sampling period are written on a memory 6, and after it has been read out, a signal is reproduced, based on both the data. According to them, only correct data is stored and the data can be stored efficiently for many hours.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data storage device that stores measured analog input signal data in a memory.

[Prior Art] Conventionally, data storage devices are known that convert an analog input signal into a digital signal, store it in a memory, reproduce it, and record it.

[The problems that this invention attempts to solve, however,
Most of these conventional devices always store input signals at a constant time period. If you try to store the measured waveform of the input signal as shown in Figure 3(a) in memory, regardless of the state change of the input signal as shown in Figure 3(b), in this example, Approximately 210 samples of data must be stored in the memory, and unimportant data is also stored in large steps, requiring a very large storage capacity.

In view of the above points, an object of the present invention is to provide a data storage device in which the data storage cycle is made variable and data can be efficiently stored for a long period of time.

[Means for Solving the Problems] The present invention provides a data storage device that converts an analog input signal into a digital signal and stores it in a memory. This is a 7'-event storage device which stores time data in the memory while changing the storage period of the data.

[Embodiment 1] FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

The analog input signal taken in by the input circuit 1 is amplified by the amplifier 2, converted into a digital signal by the A-D converter 3,
This input data is stored in the memory 6 by a processing means 4 such as a microcomputer at different storage cycles depending on changes in the state of the input signal. Further, the setting means 5 performs various settings such as storage (memory) conditions, and the display means 7,
The recording means 8 displays and records data. Further, time data is stored in the memory 6 simultaneously with input data.

That is, when storing the measured waveform of the input signal shown in FIG. 3(a) in the memory 6, it is sufficient to store it in the storage period as shown in FIG. 3(C).

In other words, as shown in Figure 2, the input signal is taken in at a predetermined period, but in region MA, the state change of the input signal is large, so the state change of the input signal is more gradual than in the minimum time region A. Therefore, 10 samples are stored at slightly longer time intervals (for example, a storage cycle of 0.2 seconds). Since the change in the input signal becomes smaller sequentially, the region tiiXc,
o,+=,F, for successively longer time intervals, e.g., O,
'3SS0° Sampled at time intervals of 4s, 0.5s, and 0.6s and stored in the memory 6, resulting in a total of 61 samples. In this way, when the state change of input data is small,
Of the data taken in by the input circuit 1, it is stored in the memory 6 only once every few times. When these input data are stored in the memory 6, time data from a time generating means (not shown) is also stored in the memory 6 in association with the input arc.

When reproducing the data next time, the processing means 4 outputs the input data to the display means 7 in real time based on the time data, that is, at every time of the storage cycle, or outputs it to the recording means 8 and prints it on recording paper. By doing so, an output corresponding to that shown in FIG. 3(C) can be obtained.

It is also possible to convert the value into actual time and output it.

In addition, the change in the state of the input signal is measured when the rate of change of the input signal is measured and the storage period (time interval) is made variable. Usually, the storage period is long, and when a certain upper limit or lower limit is exceeded. Data may be stored at a high storage cycle, or only the desired input range may be stored at high speed. Further, the data may be stored with the storage period changed according to storage (memory) conditions set in advance by the setting means 5.

This series of operations can be seen by referring to Figure 2.
Data is stored in the memory 6 while changing its storage cycle depending on a change in the state of the input signal or specified memory conditions. Also,
The reproduced data may be converted into a voltage output analog signal by a DA converter (not shown), and may be recorded on an external analog recorder or displayed on an oscilloscope. Also,
It may be possible to output it with an appropriate sound.

Since the storage cycle is changed according to changes in the state, it is possible to store a large amount of required data with a small amount of memory capacity, and high-speed phenomena can be stored without loss of quality, and fast changes and slow changes can coexist. However, data can be stored without any data loss, and actual real-time output is possible during playback due to the time γ-day.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are explanatory diagrams showing one embodiment of this invention, FIG. 3(a) is a diagram showing an example of an input signal, and FIG.
b) is a diagram showing an example of conventional data storage; FIG.
) is a diagram showing an example of data storage according to the present invention.

Claims (1)

[Claims] 1. In a data storage device that converts an analog input signal into a digital signal and stores it in a memory, the storage period of this input data is changed according to a change in the state of the input signal or a specified storage condition. A data storage device characterized in that it stores time data in a memory and also stores time data in the memory at the same time. 2. The data storage device according to claim 1, wherein input data is converted into actual time based on time data, reproduced and outputted. 3. The data storage device according to claim 1 or 2, wherein the reproduced data is recorded on recording paper. 4. Claims 1 to 3, characterized in that the reproduced data is displayed on a display means such as a CRT.
Data storage device as described in Section.