JPH0424786A - Up and down movement change circuit detection circuit - Google Patents

Abstract

PURPOSE:To precisely measure the change number in the up and down direction of a measured body by detecting the number of change of the pressure difference in and out of a case which accompanies the up and down displacement. CONSTITUTION:A microphone 4 which posesses a flat frequency characteristic in the frequency range other than the high-pass side and the low-pass side of the frequency characteristics is housed in a case 1, and an air flow vent which communicates the inside and outside of the case 1, and also gives a flow rate resistance to the air which flows is provided at the case 1. A pressure detecting means 4 is repeatedly displaced in the vertical direction in the flat frequency range of the frequency characteristics or the frequency range between a frequency 'OHz' to the flat frequency characteristics, and the number of up and down movement of the measured object is detected based on the number of generation of the pressure difference of the inside and outside of the case one generated which is generated along with that displacement. Thus, by apply ing it to a pedometer, for example, the number of steps can be obtained accu rately by counting the number of times of pressure change.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention can be used, for example, in a pedometer that is attached to a part of a pedestrian's body and used to monitor health based on the number of steps taken each day. This invention relates to a device for detecting the number of changes in vertical movement.

[Prior Art] This type of conventional device will be explained using, for example, a pedometer. In other words, conventional pedometers attach a mass such as a weight to one end of a spring, and use a counter etc. to count the number of times the weight vibrates over a predetermined amplitude in synchronization with the vertical movement that occurs when walking. , it detects how many times the foot moves up and down, that is, the number of steps.

[Problems to be solved by the invention] However, since this type of pedometer uses a vibration system consisting of a spring and a weight, if you walk while making large body movements, the vibrations will occur in a short period of time. In addition, there are cases where the step count is not sufficiently attenuated, and the number of steps "1" is counted twice as the number of steps "2", resulting in a problem that the accuracy is very poor.

[Means for Solving the Problems of the Invention] This invention is an application of the principle that I discovered when I conducted an experiment to measure the dynamic characteristics of a microphone, such as a condenser microphone, by moving it vertically (up and down). A microphone (pressure detection means) having a flat frequency characteristic within a frequency range other than the frequency bands on the high and low sides of the frequency characteristic is housed in a case, and the inside and outside of the case are communicated, and An air flow hole is provided in the case that imparts flow resistance to the circulating air, and the air flow is within the flat frequency range of the frequency characteristics, or when the frequency is "O".
Hz" to a flat frequency characteristic, the pressure detection means is repeatedly displaced in the vertical direction, and the measured value is determined based on the number of times the pressure difference inside and outside the case occurs as a result of the displacement. It detects the number of vertical movements of the body.

[Function] When the device for detecting the number of changes in vertical movement according to the present invention, for example, a pedometer, is worn on the body (for example, the ankle) while walking, the pressure detection means also moves up and down, so the vertical movement due to the vertical movement Since changes in direction, such as altitude and speed changes, occur, the number of steps is determined with high accuracy by counting the number of changes.

[First Embodiment] The configuration of an embodiment according to the present invention will be described in detail based on FIGS. 1 to 4.

(1) is a rigid high-frequency pressure filter container, and a part of its wall surface is formed with an air flow hole (2) with a flow resistance re (extremely large), and due to the flow resistance, air flow generated outside the container (1) A time delay is provided for the propagation of atmospheric pressure fluctuations into the container (1). (3) is a pressure wraparound prevention container, in which a condenser microphone (4) is installed so as to form a part of the wall surface of the pressure wraparound prevention container, and a condenser microphone (4) is installed at the rear of the microphone (4) integrally with the microphone. It forms a sealed room. In addition, since the volume of the space formed behind the electret film (4a) of the microphone (4) is small, the pressure wraparound prevention container (3) is used to compensate for the volume of this space and prevent pressure wraparound. The air circulation holes (9a), which will be described later, of the five-condenser microphone (4) are actively utilized so that the space formed in the container (3) can be regarded as one space in terms of static pressure. In this way, the space volume of the condenser microphone (4) is filled with a container (
3) By adding the volume of 1 in Fig. 3,
It is also used to shift and set 7T1 to a smaller value. In addition, sufficient airtightness is maintained so that gas does not flow inside or outside of this container (3) via the attachment portion (6) of the microphone (4) to this pressure wraparound prevention container (3). In addition, the entire space formed between the container (3) and the high-frequency pressure filter container (1) is filled with spongy bodies (7) such as sponges. When the atmospheric pressure outside the high-frequency pressure filter container (1) suddenly changes, the corpus cavernosum (7) is exposed to both containers (]) and (3).
) This is to prevent the pressure in the space formed between the air holes (2
) has a function that supplements the function of In addition, the corpora cavernosa (
7) is also used to speed up the acoustic attenuation of the air in the space where it is placed.

In this embodiment, the corpus cavernosum (7) is used, but it goes without saying that any material that provides flow resistance, such as cloth or porous material, may be used instead.

Moreover, if the filter function is sufficient only with the air circulation holes (2), the corpus cavernosum (7) may not be used.

Next, the structure of the condenser microphone (4) will be explained based on FIG. 2.

The condenser microphone (microphone) (4) is
It is currently on the market for use in radio cassette players, etc., and as shown in Figure 2, it consists of a ring-shaped insulating member (4b), a ring-shaped insulating member (4b), and a predetermined An electret film (one electrode plate) (4a) to which a charge amount Q is given, and the electret film (
A ring-shaped insulating spacer (4c) placed behind 4a)
) and behind the spacer.

disposed opposite to the electret film (4a),
The other electrode plate (4e) is provided with a plurality of air circulation holes (4d), and the other electrode plate (4e) is provided with a conductive clamping member (4f) formed in the shape of a disc spring, and a piece of adhesive. The FET integrated circuit (8) electrically connected through one terminal (8a) in series and the other three lead terminals (8b) of the FET integrated circuit (8) connect the FET integrated circuit (8) to an external circuit. a substrate (9) that is soldered to the substrate and has a plurality of air circulation holes (9a) formed therein; and a cylinder that maintains a constant distance between the substrate and the other electrode plate (4e). A shape spacing member (10) is housed in a case (11), and each of these housed members is held at both ends by clamping parts (lla) integrally provided in the case at both end openings of the case. It is stored under pressure. Case (1)
1) Although the items stored inside are pressed and held by both clamping parts (lla) provided at the openings at both ends of the case (11), microscopically, they are not completely in close contact with each other. , The air inside and outside of the case (11) flows through small gaps (gaps with large flow resistance) A, B, (, D-E) formed on the wall surface, each pressing surface, etc. inside the case (11) for a predetermined time constant. The electret film (4a) creates a difference between the pressure supplied from the outside and the internal pressure behind the electret film (4a), and is distorted according to the difference. ,Operate.

Note that the air circulation hole (9a) is formed in the substrate (9), and the air circulation hole connects the space around the FET integrated circuit (8) and the space inside the pressure wraparound prevention container (3). This is so that it can be regarded as one space, and it is intended to extend the low range side of the frequency characteristic measured with a single condenser microphone without an air circulation hole (9a) further to the lower range side.

Next, before explaining the operation of the above structure based on FIGS. 1 to 3, the symbols used in the following explanation of the principle will be explained.

T: Absolute temperature Pj: High frequency pressure filter container (1
) Outside atmospheric pressure P: Pressure inside pressure wraparound prevention container (3) Pm:
Pressure in the space between the high-frequency pressure filter container (1) and the pressure wraparound prevention container (3) e: Space between the high-frequency pressure filter container (1) and the pressure wraparound prevention container (3) Volume of the part (volume excluding the effective volume of the corpus cavernosum (7)) V (((Ve ): Space formed behind the electret film (4a) in the space inside the condenser microphone (4) The sum of the volume of the part and the volume of the space of the pressure wraparound prevention container (3) excluding the volume of the condenser microphone (4) ε022 and the other electrode plate (4e) Dielectric constant of air between So 2 and Area of electret film (4a) S Nira plus operator Q: Charge amount of electret film (4a): Honey per unit area of electret film (4a) Constant D = Thickness d of Ni spacer 4c): Amount of change in gap between both electrode plates (4a) and (4e) due to sound pressure G: Gain re of FET integrated circuit (8): Gain of air circulation hole (2) Flow resistance r: This is the flow resistance due to leakage occurring in the gaps between contact surfaces A, B, C, D, and E formed inside the condenser microphone (4).

Next, the pneumatic dynamic characteristics of the condenser microphone (4) will be explained.

(1) Atmospheric pressure Pi and high frequency pressure filter container (1
) Relationship with internal pressure Pm dPm/dt2(-]/T2) ・Pm + (1/
Dingsheng・PthT2=(re-Ve)/(R-T) R: Gas constant transfer function Pm=(1/(1+5-T2))・Pl・・・・・・・・・
:1(II) Pressure Pm and pressure wraparound prevention container (
3) Internal pressure (atmospheric pressure) P which relationship dP/dt= (-]/T1)-P+ (J/T1)・
PmT=('・V)/(R-T) Transfer function is P= (1/(1+s4□))・Pm-■(m) Output voltage of condenser microphone (4) (Eb-1-
Relationship between e), Pm, and Pi (Eb: bias voltage of condenser microbond (4), e: 8-force voltage due to pressure change) Eb+e=G・((1(Dad)/(So・t),
))=(G-D-Q)/(So-Eo)+(G-Q-d
)/(So・to)d=(Pteng−P)/, so Eb+e:(G−1)Q)/(S, s E , )”(
(GJ)/(S, sε.))・(1/k)・(P+w−
P) Therefore, Eb= (G-D-Q)/(So・ξ.)e= ((G
-Q)/(So, ε.・k)) ・(Pa -P) Substituting the relationship in the equation (■) into the above equation, we get e" ((G-Q)/(So-t, 5k))"(( s
4. )/(1+s4.)) Furthermore, by substituting the relationship of the equation (■) into the above equation, e= ((G-Q)/(So-E, -
k))l(s・ding,)/(]+s・ding□:・(1/(1
+5-T2))・Pi・・・・・・■.

In a normal condenser microphone (4) (G-Q)
/(S, ・t, ・k)=10-3V, 1Bar or r> re Ve'J+ V 72<71
Therefore, the frequency weight from Pi to e in the equation (2) is as shown in FIG.

From this figure, frequency f < (1/27CTx) (= (1/27C)
- It has been shown that e is proportional to the differential of Pi in the range of ((r-V)/(R4)4.

That is, at f < (1/2πT1), e = ((G-Q)/ (S, , t, -k))
・(dPi/dtl・・−■ holds true.

Here, within the altitude range from sea level to several thousand meters,
Air pressure is proportional to height (vertical distance from a place based on the altitude of O pressure in the stratosphere), so Pi=ρgh・・・・・・・・・■(ρ: Density of air , g double force acceleration) Substituting this into the equation (■), the relationship between the output voltage e due to the sound pressure of the condenser microphone (4) and the vertical speed V is e: ((G-Q)/(So-E o- k))・(s-T
□/(1+s-T, ))・(1/ (1+s・d2)・
)ρ・gh=(CG-0・ρ・g)/(S,・
ε.・k))・(T7(1+S・d□))・(1/(
1+542))・v.

e = ((c”Q” p ”g)/(so
' t o ・k)) 41・v= ((K-Q・ρ・g
)/(S,・ε.・k))・((r-V)/(R4))
・V...■The output voltage e of the condenser microphone (4) in the system shown in FIG. 1 is proportional to the vertical speed V.

Also, by substituting the formula ■ into the formula ■, e = ((G-Q)/(So・t,・k))・(s4
1/(1+s4.))(1/(1+5-T2)・)ρ・
gh・= ・=−■.

Here, the volume of the space inside the condenser microphone (4) and the volume of the space inside the pressure wraparound prevention container (3) formed behind the electret film (4a) are determined so that the time constant □ is sufficiently large. The air circulation hole (
2), the flow resistance re is reduced by /h, and the volume of the corpus cavernosum (7) is excluded from the total volume of the space formed between the high-frequency pressure filter container (1) and the pressure wraparound prevention container (3). If the volume Ve of the part is chosen small, the frequency (1/(2πT)) < f ((1/(
2πT2)), the output voltage e is e = ((G-Q-ρ・g)/(Sll-io'k
))・h −−−−−■, and the output voltage e of the condenser microphone (4) is proportional to the height.

Note that the time constant in Figure 3 is T2 (or cutoff frequency f, = 1/(2xd), f2 = 1/(2πT2)
) is the volume Ve of the portion obtained by excluding the volume of the corpus cavernosum (7) from the total volume of the space formed between the high-frequency pressure filter container (1) and the pressure wraparound prevention container (3), and the electret film ( This can be adjusted by changing the sum V of the volume of the space inside the condenser microphone (4) and the volume of the space inside the pressure wraparound prevention container (3), which are formed behind the pressure wraparound device 4a). Among these, the time constant T1 is determined depending on what range of speed is to be measured. That is, it is a constant used when determining the maximum frequency in the usage range.

[Second Embodiment] A pedometer to which equation (2) of the above principle is applied will now be described with reference to FIGS. 4 and 5.

In Fig. 4, (4) is a condenser microphone housed in the high-frequency pressure filter container (1) as shown in Fig. 1. By being attached to a part of the pedestrian's body, Detects vertical movement of the body. (13)
is a reference voltage generation circuit, which is connected to a condenser microphone (1
A voltage equal to the bias voltage Eb constantly output from 2) is set as a reference voltage, and this reference voltage is output. (14) is a differential amplifier which generates a bias voltage Eb from among the signals output from the FET integrated circuit (8) of the condenser microphone (4).
3) High-frequency pressure filter container (1) that is canceled by the reference voltage supplied from and caused by displacement in the vertical (up and down) direction.
Only the output voltage e due to the change in the air pressure inside is amplified and output as a signal (Fig. 5b). (18) is a band pass filter that filters the third signal from among the signals output from the condenser microphone (4). A frequency (angular frequency) band is set to pass only the angular frequency components within the range from 1/T1 to 1/2 in the frequency characteristic diagram shown in the figure, and is supplied from the differential amplifier (I4). Only the signal component (pulsating flow component shown in FIG. 5) related to displacement in the vertical direction is extracted from the signal. (19) is a waveform shaping circuit which converts the signal supplied from the bandpass filter (18) into a pulse waveform (FIG. 5C) and outputs it (FIG. 5C). (20
) is a counter circuit that counts the pulse waveform supplied from the waveform shaping circuit (19) and displays the counting result on the first display (
21) and display 1. Also, the counter circuit (2
0), its count value is reset by closing the normally open reset switch (17). (15) is an integrating circuit that integrates the signal supplied from the differential amplifier (14) with a predetermined time constant to obtain the altitude difference from the start of walking to the present moment (Fig. 5 d). A signal indicating the determined altitude difference (FIG. 5d) is supplied to the second display (16) and displayed. Further, the integral value of the integrating circuit (15) is reset by opening the reset switch (17).

Next, the operation of the above configuration will be explained based on FIG.

It is assumed that the entire circuit shown in FIG. 4 is housed in a case (not shown) and is attached to a part of the pedestrian's body, such as the chest, waist, shoes, etc. In addition, in Fig. 5, with the starting point as the reference point and the altitude as Om, the time TTO'',
As the walking time progresses, the altitude difference between the current point of walking and the starting point actually changes as shown in Figure 5 (point with an altitude difference of 100").
It is assumed that the change occurs as shown by the solid line in a). Under such circumstances, when the reset switch (17) is closed, both the counter circuit (20) and the integrating circuit (15) are reset, and walking is started, the condenser microphone (4) is closed as in the above embodiment. ), the bias signal Eb is sent from the base 4 voltage generator (12) to the differential amplifier (
14) is canceled by the reference voltage supplied to
As a result, the pressure inside and outside of the high-frequency pressure filter container (1) fluctuates due to the vertical movement of the entire body or a part of the body during walking, and voltage fluctuations corresponding to the pressure fluctuations are caused by the pulsating flow shown in Fig. 5(b). and is output from the differential amplifier (14). After that, only the pulsating flow component is extracted by a band pass filter (18), converted into a pulse signal (C) as shown in Fig. 5 (C) by a waveform shaping circuit (19), and counted by a counter circuit (20). The counting results are displayed on the first display (21
) is displayed as the cumulative number of steps. Also, a differential amplifier (1
The output signal shown in Figure 4 (b) from 4) is integrated by the integrating circuit (15), and the integration result is displayed on the second display (coro) as the altitude difference between the current point and the starting point. .

In this embodiment, the integrating circuit (15) calculates the altitude difference between the starting point and the final point, but a peak value hold circuit is interposed between the integrating circuit (15) and the second display (16). The maximum altitude difference between the start and end of walking (characterized by the altitude of the starting point) can be displayed on the second display (16). Good. This allows you to know, for example, how high you have climbed in one day compared to the altitude of your starting point, and it can be used as a guide for your exercise. Also, when climbing, you can measure the altitude difference between your starting point and your current point. Since you can know the altitude difference to your destination by comparing it with a map, you can more accurately predict the time required to reach your destination.

[Third Embodiment] This embodiment is an application of equation (2) (or equation (2)) of the above principle, and will be explained in detail based on FIG. 6.

In FIG. 6, components that are the same as or equivalent to those shown in FIG. 4 are given the same reference numerals, and their explanation will be omitted, and only different parts will be explained.

(22) is a gate circuit which supplies a pulse signal from a waveform shaping circuit (19) to a counter circuit (20) only when a control signal is supplied from a comparison circuit (23) to be described later.

In the comparison circuit (23), the time required for one step when an S-type person walks for the purpose of exercise is set as a reference pulse width in correspondence with the pulse width as a lapel time, and the reference pulse width is set as a reference pulse width. and the pulse width of the pulse signal output from the waveform shaping circuit (19) every time the foot takes a step, and if the pulse width is smaller than the set reference pulse width, that is, the walking is changed to a racewalk-like movement. If the user is walking more vigorously and taking more steps per unit time, a control signal is supplied to the gate circuit (22).

Furthermore, if the pulse width of the pulse signal supplied from the waveform shaping circuit (19) is larger than the set standard pulse width, the comparison circuit (23) determines that the foot movement is slow. Stop outputting control signals. (24)
is a notification unit which generates a notification sound every time a control signal is supplied from the comparison circuit (23), and has a function of notifying the pedestrian of the rhythm when walking is an exercise.

Incidentally, if this embodiment is configured based on the formula (■), the signal extraction function of the bandpass filter (18) shown in FIG.
It must be set within the frequency range of (1/(2πT2)), or if configured based on the formula (■),
It is necessary to set the signal extraction function of the bandpass filter (18) shown in Fig. 6 to a low-pass filter function that extracts signal components within the frequency range of 0 < f < (1/(2πT1)). Not even.

Next, the operation of the above configuration will be explained.

The output pulse signal from the waveform shaping circuit (19) accompanying walking is supplied to the gate circuit g (22) and the comparison circuit (23), and the pulse signal is used in the comparison circuit (23) to determine the standard required for each step of movement. It is compared with the pulse width corresponding to the time. As a result of the comparison, if the pulse width of the pulse signal supplied to the comparison circuit (23) is shorter than the set pulse width, the gate circuit (22) is opened and the output from the waveform shaping circuit (19) is The pulse signal is converted into a counter circuit (20
), the number of steps taken during exercise is counted, and the counting result is supplied to a display (21) to display the cumulative number of steps. On the other hand, if the counter circuit (20) is counting, it will be notified by sound at the same time.
While walking, you can find out whether you need more or less time per step compared to the time required per step when a standard person walks consciously of exercise. If there are many, you can walk at a fast tempo to keep up with the rhythm while paying attention to the sound from the notification unit (24).

In addition, by resetting the standard number of steps per unit time set in the comparison circuit (23) for elderly people, it becomes a completely new health promotion and management tool for elderly people whose legs become weak for the first time, and it can also be used for exercise. Even in cases where patients with functional disabilities undergo rehabilitation, etc., the number of steps taken per day or per time can be given to doctors, etc. as numerical values, and can be captured as numerical data, so it is expected that the treatment will be more effective.

[Fourth Embodiment] This embodiment is based on equation (2) of the above principle, and the case where the device according to the present invention is attached to the foot will be explained in detail with reference to FIG.

In FIG. 7, components that are the same or equivalent to those in FIGS.
8') and the comparison circuit (23') will be explained.

The bandpass filter (18') has a function of passing only signal components in a frequency range of 0<f<(1/(:2zT,)). In addition, (23') is a comparison circuit, which is set as a reference voltage value to a signal corresponding to the height of the foot raised when a standard person walks.
18), input the voltage waveform output from (the sinusoidal pulsating voltage waveform shown in Figure 5), compare the input voltage waveform with the set reference value, and calculate the voltage waveform of the input voltage waveform. If the peak value is larger than the reference voltage value, the foot is raised higher than that of a standard person when walking, and the control signal is sent to the gate circuit (22) and the notification unit (24), indicating that the foot is moving.
supply to.

By attaching a device configured in this way to the foot and using it, it is possible to measure whether one's foot is raised higher than other people's feet or not when walking or exercising. Because you can know it along with the data.

, it can be used to correct the way you lift your legs, which you were previously unable to do on your own. It also has the effect of allowing one person to measure motor functions such as vertical jump, which could only be measured at a designated measurement location.

[Fifth Embodiment] This embodiment is based on equation (2) (or equation (2)) of the above principle, and will be explained in detail based on FIG.

In FIG. 8, components that are the same as or equivalent to those in FIGS. 4 and 6 are given the same reference numerals, and their explanation will be omitted, and only the different parts will be explained.

(25) is an A/D converter, and a bandpass filter (18
) converts the analog signal supplied from the converter into a digital signal. (26) is a signal processing circuit with memory, A/D
The signal waveform supplied from the converter (25) is stored while being updated sequentially, and the signal waveform supplied this time (the waveform for one cycle from the previous inflection point to the current inflection point) and the signal waveform supplied last time are stored. Compares the stored signal waveform and determines whether the period is within the allowable range compared to the previous one, and whether the degree of waveform distortion is within the allowable range. do.

As a result, when it is determined that the walking is normal within the allowable range, a signal for opening the gate is supplied from the signal processing circuit (26) to the gate circuit (22), and the waveform shaping circuit ( The output signal of the bandpass filter (18) via the bandpass filter (19) is supplied to the counter circuit (20). However, if an abnormality is determined to be outside the allowable range, for example if you trip or slip on a slope, the supplied signal waveform will be distorted, the period will become shorter or longer, and in that case the gate circuit ( A signal for closing the gate of (22) is supplied to the gate circuit (22). This makes it possible to prevent duplicate counting of trips and slips on rough roads such as slopes when walking on mountain roads and the like.

Incidentally, if this embodiment is constructed based on the formula (■), the signal extraction function of the band pass filter (18) shown in FIG.
It must be set within the frequency range of /(2z T2)), but if it is configured based on the formula (■),
The signal extraction function of the bandpass filter (18) shown in Figure 8 must be set to a low-pass filter function that extracts signal components within the frequency range of 0 (f ((1/(2πT))). Needless to say.

[Sixth Embodiment] This embodiment is based on equation (2) of the above principle, and will be explained in detail based on FIG. 9.

In FIG. 9, parts that are the same as or equivalent to the components in FIGS. 6 and 8 are given the same reference numerals, and their explanation will be omitted, and only the different parts will be explained.

(27) is a one-shot multivibrator which converts the pulse signal supplied from the waveform shaping circuit (I9) into a pulse signal of a predetermined pulse width each time it is supplied, and outputs the pulse signal. The pulse width of this converted pulse signal is
When walking for exercise, a value corresponding to the time required for a standard person to take one step is set as a reference value. (22') is a gate circuit which inputs a pulse signal with a predetermined pulse width supplied from the one-shot multivibrator (27) and a pulse signal supplied from the waveform shaping circuit (19), and converts both pulse signals. By comparison, the pulse width (base 11! value) of the pulse signal supplied from the one-shot multivibrator (27) is
9) The alarm (28) increases the pitch only when the pulse width is smaller than the pulse width of the pulse signal supplied from the alarm (28).
to give instructions and generate sound.

Note that if this embodiment is constructed based on the formula (■), the signal extraction function of the bandpass filter (]8) shown in FIG. It goes without saying that it must be set to a low-pass filter function that extracts signal components within the frequency range.

Furthermore, in each of the above embodiments, the direction of displacement is vertical, but it goes without saying that even if the aircraft moves up and down diagonally, the displacement component in the vertical direction can be determined by the device according to the present invention. do not have.

[Seventh Embodiment] This embodiment is based on equation (2) (or equation (2)) of the above principle, and will be explained in detail based on FIG. 10. FIG. 10 shows only the different parts from the configuration shown in FIG. 9, and the other parts are the same or equivalent.

(29) is a coefficient setting device consisting of a numeric keypad, etc., and is used to input and set the radius and coefficient of the rotation locus of the subject device attached to the rotating part of the object to be measured, such as the wheel of a bicycle, by external operation. . (30) is an arithmetic circuit consisting of a CPU, etc., which calculates a value calculated based on the value set by the coefficient setter (29) with respect to the counting result supplied from the counter circuit (20), that is, a value calculated based on the value set by the coefficient setter (29). Multiply the distance the bicycle travels by rotating, and display the result on the display (2
1) and display it.

Next, the effect of the above configuration will be explained.

Assume that the device configured as described above is attached to, for example, one ankle while riding a bicycle, and the distance traveled by actually depressing the pedals is measured.

Under these conditions, when the radius of the rotation locus of the ankle stepping on the pedal and the coefficient 2π are input using the coefficient setter (29), the arithmetic circuit (30) inputs the values supplied from the counter circuit (20). The distance traveled by one rotation of the pedal (calculated by multiplying the value of (2π x radius of rotation trajectory) by a predetermined coefficient) is calculated by multiplying the count value. is calculated. Note that, depending on this calculation, only the distance traveled as a result of the actual physical exercise of the person riding the bicycle is calculated, excluding the distance traveled naturally by the bicycle due to inertia force etc. on slopes etc.

Although the above description is based on the case of actually driving by depressing the pedals, it is also possible to attach it to a wheel and calculate the distance traveled based on the rotation of the wheel. In that case, the radius of the rotation trajectory of the device can be Just set it.

Moreover, if this embodiment is constructed based on the formula (■), the signal extraction function of the band pass filter (18) shown in FIG.
It must be set within the frequency range of (1/(2πT2)), but if it is constructed based on the formula (■), the signal extraction function of the bandpass filter (18) shown in FIG. It goes without saying that the low-pass filter function must be set to extract signal components within the frequency range of f ((1/(2πT1)).

[Effects of the Invention] As described above, the present invention provides a case that has an air circulation hole that provides flow resistance to the flowing gas, and a case that has a flat frequency range except for the frequency ranges on the high and low sides. and a pressure detection means housed in the case,
And frequency II Q H211 of the memorized frequency characteristics
The pressure detecting means is made to change vertically within a frequency range ranging from 100 to a flat frequency characteristic, or within a frequency range within either the flat frequency characteristic range, and as the pressure detecting means is vertically displaced, the inside and outside of the case are Since this device detects the number of changes in vertical motion by detecting the number of changes in pressure difference, it is unique in that it can accurately measure the number of changes in the vertical direction of an object to be measured, for example, the number of times a pedestrian's foot changes in the vertical direction. It can be effective. Moreover, this invention has the unique effect of being able to obtain a device with a smaller size and being able to use microphones that are produced in extremely large quantities, making it extremely inexpensive to produce.

[Brief explanation of drawings]

Fig. 1 is a first embodiment of the present invention, and is an explanatory diagram of the main part of the part that converts air pressure changes into electrical signals, and Fig. 2 is a condenser microphone (
4), FIG. 3 is a frequency characteristic diagram of the condenser microphone (4), FIG. 4 is a second embodiment showing the main circuit diagram of the system circuit diagram according to the present invention, and FIG.
6 is a circuit block diagram of the third embodiment, FIG. 7 is a circuit block diagram of the fourth embodiment, and FIG. 8 is a circuit block diagram of the fifth embodiment. Figure 9 is the 6th
Circuit Block Diagram of Embodiment FIG. 10 is a circuit block diagram of the seventh embodiment. 1... Container for high-frequency pressure filter 2... Air circulation hole 3... Container for preventing pressure leakage 4... Condenser microphone 4a...
...Electret film (electrode plate) 4c...
Spacer 4e... Electrode plate 7...
Cavernous body 8...FET integrated circuits 8a, 8b
....-Lead terminal 13...Reference voltage generation circuit 14...Differential amplifier 16.21...Display device 17--Reset switch 18 ......Band pass filter 19...-Waveform shaping circuit 2 22...Gate circuit 23.23'...Comparison circuit 24...Notification section 25 ...26...
...Signal processing circuit O... Counter circuit A/D converter Fig. 1 Fig. 3 Fig. 2 Fig. 5 Fig. 10

Claims (1)

[Claims] (1) A case that has air circulation holes that provide flow resistance to the flowing gas, and has frequency characteristics that are flat in other frequency ranges except for the high and low frequency ranges, and is housed in the case. pressure detection means, and within a frequency range from the frequency "0 Hz" to a flat frequency characteristic, or within one of the frequency ranges within the flat frequency characteristic. A device for detecting the number of vertical motion changes, characterized in that the pressure detecting means is made to change in the vertical direction, and the number of changes in the pressure difference inside and outside the case accompanying the vertical displacement is detected.