JPH0678902A - Moving means discriminating method - Google Patents

Abstract

PURPOSE:To provide a method capable of continuously discriminating a moving means by a very small amount of calculation or by an analog circuit. CONSTITUTION:A signal of a vibration sensor 5 is amplified by an amplifier 6, then separated per frequency by a low-pass filter 7 and a high-pass filter 9 to obtain each energy by practical value circuits 8, 10, and then the divided signals are converted to numerical values by an A/D converter 11 to be input to a central processing unit (computer unit) 12. When the thus obtained energy of every frequency is taken as coordinate to draw a graph, a fixed range is obtained by a moving means, so that the moving means can be easily discriminated from the region where the point belongs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of discriminating means of movement, and more particularly to a method of discriminating means of movement used in a behavior recording apparatus used for human behavior management, health management and the like.

[0002]

2. Description of the Related Art Conventionally, a device for counting the number of steps and displaying the total number of steps since wearing and a device for calculating the amount of exercise from the number of steps per unit time have been devised, but these are limited to walking. Moreover, since it is not possible to store information internally at each time, it could only be used for simple health management. On the other hand, devices for recording entry and exit times and their times have been devised and widely used, but the information that can be recorded is limited only to the entry and exit times. On the other hand, regarding the vehicle,
A so-called tachograph, which automatically records the speed at each time, has been devised and widely used.

[0003]

DISCLOSURE OF THE INVENTION The inventor of the present invention records or records how and for what time a person has moved or stopped at each time, so that the memory or recording of the person himself / herself has been conventionally made. In order to provide a device that automatically measures and records information about movement that had to be relied on, the vibration sensor attached to the human body or clothes and the vibration of the human body obtained by the vibration sensor are analyzed and moved. An action recording device has been developed which comprises an information processing device for determining time and movement means and a device for recording or storing such information at each time, and has already applied for a patent (Japanese Patent Application No. 3-40510).
issue).

In the embodiment of the behavior recording apparatus developed by the present inventor, the vibration of a person is measured as an acceleration by the piezoelectric element acceleration transducer, and the time series signal of the acceleration converted into a digital value by the A / D converter. Is Micro C
The power spectrum is calculated by the calculation by the PU (the FFT method (fast Fourier transform method) is used for this calculation).
Since the power spectrum has a peak that can be easily discriminated by the moving means and its speed, it is possible to estimate the moving means from the vibration by obtaining the peak value range of the reference moving means vs. the power spectrum in advance. Become. However, this method requires a lot of calculation,
Further, there is a problem that the means of movement can be discriminated only discontinuously.

The present invention replaces the above-mentioned method in which the amount of calculation is large and the moving means can be discriminated only discontinuously, and a method in which the moving means can be discriminated continuously by an extremely small amount of calculation or an analog circuit. It is provided.

[0006]

According to the present invention, in order to achieve the above object, information obtained by a vibration sensor attached to a human body or clothes is separated for each frequency, and low frequency and high frequency are respectively separated. There is provided a method of discriminating a moving means, which is characterized by estimating the moving means according to the amount of energy.

[0007]

According to the present invention, the signal from the vibration sensor attached to the human body or clothes is decomposed into two or more frequency components by a numerical filter or a filter by an electric circuit, and the energy amount of each component is obtained. When a graph is drawn with the energy for each frequency obtained in this way as coordinates, the area becomes a certain range depending on the moving means.
Therefore, it is possible to determine the moving means based on the area to which the coordinate point determined based on the calculated energy amount belongs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of the present invention will be described more specifically below with reference to the drawings showing the embodiments of the present invention. FIG. 1 shows an embodiment in which the present invention is realized by a numerical filter. A signal from a vibration sensor 1 is amplified by an amplifier 2 and input as a numerical value to a CPU (computer unit) 4 by an A / D converter 3. The CPU 4 executes a digital filter by a program, separates this signal for each frequency, and obtains energy of each frequency band.

FIG. 2 shows an embodiment in which the present invention is realized by an analog circuit, which is the same as the embodiment shown in FIG. 1 until the signal of the vibration sensor 5 is amplified by the amplifier 6, but thereafter the low-pass filter 7 is used. And the high pass filter 9 separates each frequency, and the execution value circuits 8 and
After obtaining the energy by 10, the A / D converter 1
It is converted into a numerical value by 1 and input to the CPU 12. In any case, when a graph is drawn with the energy for each frequency thus obtained as coordinates, the moving means makes a certain range as shown in FIG. 3, so that the moving means can be easily discriminated from the area to which the point belongs. can do.

[0010]

According to the moving means discriminating method of the present invention, the amount of calculation is greatly reduced as compared with the conventional FFT method, so that it can be realized by an inexpensive microcomputer, and for this reason, power saving can be achieved. The device can be downsized. On the other hand, unlike the FFT method, the data accumulated for a certain period of time is not calculated collectively, but the output is continuously obtained, so that the moving means can be accurately determined in real time.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of another embodiment of the present invention.

FIG. 3 is a graph showing regions to which various moving means belong when high frequency energy and low frequency energy are plotted as vertical and horizontal coordinate axes.

[Explanation of symbols]

1,5 Vibration sensor, 2,6 Amplifier, 3,11 A /
D converter, 4, 12 CPU, 7 low-pass filter, 8, 10 execution value circuit, 9 high-pass filter

Claims (1)

[Claims] 1. Information obtained by a vibration sensor attached to a human body or clothing is separated for each frequency,
A method of determining a moving means, which estimates the moving means based on the amount of energy of each high frequency.