JP3468719B2 - Data recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording device for sampling a target waveform signal generated irregularly and recording the data, and more particularly to a data recording device capable of recording data for a long time.

[0002]

2. Description of the Related Art Conventional data recording devices have been provided.
In a conventional data recording device, in order to sample and record a signal that occurs irregularly, a sampling time is set so as to include a signal generation time point. Alternatively, all data is recorded by constantly sampling.

[0003]

The conventional data recording device is constructed as described above. Therefore, it is necessary to perform sampling for a very long time compared to the time from the signal generation time for sampling and recording the target signal to the end.

For example, taking a pulse wave as an example, the amplitude is 16
1 bit when sampling at 400Hz
The data becomes 48 kbytes per minute. 2.8 in 1 hour
Since the size is M bytes, which is a very large data size equivalent to two floppy disks, it is necessary to replace the recording medium. Further, there is a problem that continuous observation is impossible when the exchange is not performed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a data recording apparatus capable of recording data for a long time.

[0006]

A data recording apparatus according to the present invention comprises an amplification means for amplifying input data and an input data.
A waveform shaping means for further amplifying and shaping the waveform of the amplified input data when there is a data, and the input data amplified by the amplifying means is sampled and stored using the waveform shaped signal as a sampling timing signal. .

Since the waveform is shaped only when the input data is present and the signal is used as the sampling timing signal, it is possible to provide the data recording device capable of performing the sampling only when the data needs to be stored.

Preferably, the waveform shaping means shapes the input signal into a rectangular wave and performs sampling in response to the rising edge of the rectangular wave.

Since sampling is performed in response to the rising edge of the rectangular wave, sampling starts only when the rectangular wave rises.

More preferably, a predetermined period from the trailing edge of the rectangular wave or the rising edge of the next rectangular wave after an arbitrary specified number of sampling times is set as a sampling pause period, and the timer of the microcomputer counts time.

Since the sampling is paused from the falling edge of a rectangular wave to the rising edge of the next rectangular wave, sampling is performed and recorded only when necessary. as a result,
A data recording device capable of recording data for a long time can be provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(1) First Embodiment FIG. 1 is a block diagram showing a main part of a data recording apparatus according to the first embodiment of the present invention. With reference to FIG. 1, a data recording device according to a first embodiment of the present invention is connected to a sensor 1 for detecting data, an amplifier 2 connected to the sensor 1 for amplifying input data, and an amplifier. A timing signal generator 4 for inputting the signal amplified by the amplifier 2, a microcomputer 3 connected to the amplifier 2 and the timing signal generator 4, and a storage device 7 connected to the microcomputer. A part of the output from the amplifier 2 is sent to the timing signal generator 4, and the other part is sent to the sensing signal 5
Is input to the microcomputer 3 via the terminal TP1. Here, the amplifier 2 amplifies the data detected by the sensor 1 to a level suitable for sampling. The timing signal generator 4 further amplifies the sensing signal 5 and shapes it into a rectangular wave.

The signal from the timing signal generator 4 is input to the microcomputer 3 as the sampling timing signal 6 via the terminal TP2. The microcomputer 3 sends the waveform block data 8 to the storage device 7. Here, the storage device 7 includes a memory, a hard disk, a magnetic tape, an optical disk, paper, and the like.

FIG. 2 is a diagram showing the signal waveforms of the sensing signal 5 and the sampling timing signal 6. The operation of the data recording device will be described with reference to FIGS.

The signal detected by the sensor 1 is amplified by the amplifier 2 and sent to the terminal TP1 as the sensing signal 5. The waveform of the sensing signal 5 is shaped by the timing signal generator 4, and the sampling signal 5 is input to the A / D port (not shown) of the microcomputer 3 together with the sensing signal 5. Here, the microcomputer 3 responds to the rising of the sampling timing signal 6 by sensing signal 5
Is sampled and the waveform block data 8 is sent to the storage device 7. Further, in response to the fall of the sampling timing signal 6, sampling is stopped. Similarly, when the sensor 1 detects any detection signal, it sends it to the amplifier 2 as input data, and the timing signal generator 4
Then, the sampling timing signal 6 is generated, and the observed waveform of the input data is recorded in the storage device 7 in accordance with the rise and fall of the signal.

The pause of sampling is not limited to the fall of the sampling timing signal 6, but a fixed period may be set as a pause period after an arbitrary specified number of sampling times.

FIG. 3 is a circuit diagram showing a main part of the data recording device shown in FIG. The same parts as those in FIG. As shown in FIG. 3, the amplifier 2 and the timing signal generator 4 are both non-inverting amplifier circuits using standard operational amplifiers.

FIG. 4 is a flow chart showing the contents of the waveform processing performed by the microcomputer 3 in the first embodiment.

First, it is determined whether or not it is during the rest period (step S11). When the pause period ends (NO in S11), the microcomputer 3 synchronizes with the rising edge of the sampling timing signal 6 shaped by the timing signal generator 4.
Starts sampling of the sensing signal 5 (S1
3).

When the predetermined sampling time is exceeded (YES in S14), the program counts the idle period and waits for the next rising of the timing signal (S1).
1, S12).

In this way, the sampling of the data stored in the storage device 7 is 100 waveforms per waveform.
If it is performed once (when the sampling period is 1 second, the data is captured once every 10 msec), 100 pieces of data are stored as 1 block (1 waveform) with the time of the pause period as a header. It

(2) Second Embodiment FIG. 5 is a block diagram showing the configuration of the data recording device in the second embodiment, and FIG. 6 shows the observed waveform graph of the waveform recording device in the second embodiment together with the sampling clock. It is a figure.

The second embodiment is different from the first embodiment in that an external A / D converter 8 is provided in front of the microcomputer 3, and the sampling timing signal 6 is input to the microcomputer 3 via the terminal TP2 and then sampled. The first point is that the clock 10 is sent from the microcomputer 3 to the external A / D converter 8 and the A / D converted data 9 is sent from the external A / D converter 8 to the microcomputer 3 in response to the sampling clock 10. 1 is different from the first embodiment. In the case shown in the figure, 6 times is preset as an arbitrary prescribed number of samplings, and sampling is performed 6 times with 6 sampling counts. Since the other parts are the same as those in the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

Referring to FIG. 6, terminals TP1 and TP2
The waveforms of the sensing signal 5 and the sampling timing signal 6 input from are the same as those of the first embodiment. However, the sampling clock 10 output from the microcomputer 3 is different as shown in FIG. In response to the sampling clock 10, the waveform of the input data is recorded in the storage device 7.

Since the operation of the microcomputer 3 in this case is basically the same as that of the first embodiment, its flowchart is omitted.

The data recording device as described above is specifically used for seismographs, human body detection devices, health devices such as pedometers and pulse meters.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[Brief description of drawings]

FIG. 1 is a block diagram of a data recording device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a signal waveform in the first embodiment.

FIG. 3 is a circuit diagram showing a main part of a sensor, an amplifier, and a timing signal generator.

FIG. 4 is a flowchart showing waveform processing contents of a microcomputer.

FIG. 5 is a block diagram showing a main part of a data recording device according to a second embodiment.

FIG. 6 is a diagram showing an observed waveform graph in the second embodiment.

[Explanation of symbols]

1 sensor 2 amplifier 3 Microcomputer 4 Timing generator 5 Sensing signal 6 Sampling timing signal 7 storage device 8 External A / D converter 9 A / D conversion data 10 sampling clock 11 Waveform block data

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Claims (3)

(57) [Claims] 1. An amplification means for amplifying input data, a waveform shaping means for further amplifying the waveform of the input data amplified by the amplification means when the input data is present, and the waveform-shaped signal. Is used as a sampling timing signal to sample and store the input data amplified by the amplifying means. 2. The data recording device according to claim 1, wherein the waveform shaping means shapes the input data into a rectangular wave and performs sampling in response to the rising of the rectangular wave. 3. The data recording apparatus according to claim 2, wherein a predetermined period from the fall of the rectangular wave to the rise of the next rectangular wave is a sampling pause period.