JP2566563B2 - Walking distance measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a walking distance measuring device capable of measuring a walking distance when worn on the body.

[Conventional technology]

In recent years, interest in health has been increasing, and more and more people are enthusiastically exercising mainly on walking in order to prevent deterioration of legs and waist or to actively train. There are various types of exercises that mainly involve walking, such as walking, hiking, competition, orienteering, and walking rallies. Among these events, if you can know the walking distance, you can manage your goals and , There are some advantages to improving the results. For example, in the case of a walk or a race walk, it is possible to manage the amount of exercise per day, and in the case of a walking rally, it is possible to reduce the demerits in the competition by knowing the accurate walking distance.

However, it is strongly desired to measure the walking distance accurately, but as a conventional walking distance meter, set your own stride on a pedometer and calculate the number of steps of the pedometer and the set stride. By doing so, the walking distance was simply displayed.

[Problems to be solved by the invention]

However, in the simple walking pedometer, the number of steps detected by the pedometer itself causes an error due to chattering, etc., and the actual stride varies with respect to the set stride, so that the calculated walking distance is reliable. Is less
There is a problem that the displayed walking distance can be used only for reference.

An object of the present invention is to solve the above-mentioned problems and to provide a full-scale walking distance measuring device capable of performing accurate walking distance measurement only by mounting on the body.

[Means for solving problems]

The structure of the present invention for achieving the above object is as follows.

The body is composed of a body mounted on one foot and outputting an ultrasonic transmission signal, and a reflector mounted on the other foot and configured to detect the ultrasonic transmission signal and output an ultrasonic reflection signal. A distance measuring circuit for measuring the distance between the main body and the reflector by starting counting in synchronization with the sound wave transmission signal and ending counting in synchronization with the ultrasonic wave reflection signal, and continuously by the distance measuring circuit. A maximum data determination circuit that determines maximum data from the measured distance data, and an integration circuit that integrates the maximum data to calculate walking distance data.

〔Example〕

 Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an external view of a walking distance measuring device of the present invention. FIG. 1 (a) shows a main body and FIG. 1 (b) shows a reflector. The main body 1 is composed of an ultrasonic speaker for transmission and reception, a microphone 2 (hereinafter abbreviated as acoustic wave SM), a display device 3 capable of displaying a walking distance of 6 digits, a power button 4, and a band 5 to be worn on the body. The reflector 10 is an ultrasonic wave SM for transmission and reception.
11, a power button 12, and a band 13 for the device.

FIG. 2 is a state diagram showing a state in which the gait measuring device shown in FIG. 1 is attached to the body, and the body 1 is attached to one ankle and the reflector 10 is attached to the other footsteps by the bands 5 and 13, respectively. The walking distance is measured by transmitting and receiving ultrasonic waves indicated by the dotted line.

FIG. 3 is a time chart for explaining the measurement principle of the gait measuring device shown in FIG. 2. FIG. 3 (a) shows a change in time with walking, and FIG. 3 (b) shows a moving state of a foot. , Third
The figure (c) shows the measured value of the distance as the foot moves. Next, the measuring principle of the walking distance measuring device according to the present invention will be described with reference to the time charts of FIG. 2 and FIG.

That is, in FIG. 2, the right foot on which the main body 1 is attached is A,
Assuming that the left foot on which the reflector 10 is attached is B, the distance between the right foot A and the left foot B is continuously measured by transmitting and receiving ultrasonic waves between the body 1 and the reflector 10, as will be described later. It is stored in a memory circuit built in the, and the walking distance is calculated according to the result.

FIG. 3B shows the foot shapes of the right foot A and the left foot B. At time t ₁ , the right foot A and the left foot B are in the same position as A ₁ and B ₁ , so As shown in Figure (c),
The distance measurement value L is “0”. Considering the state in which the right foot A is stepped from the position A ₁ to the position A ₂ according to the arrow a ₁ by starting walking from this state, the right foot A ₁ gradually separates from the left foot B ₁ and the arrow a _In contrast to ₁ , the measured value of the distance increases like l ₁ and the measured value becomes the maximum value of L ₁ at the time t ₂ when the right foot lands on the position of A ₂ . Next, when the left foot B ₁ is advanced according to the arrow b ₁ , the distance between the left foot B ₁ and the right foot A ₂ is gradually shortened, and the measured value is decreased by l _{2 with} respect to the arrow b ₁ , and the left foot B ′ ₁ is changed to the right foot. When passing the position of A ₂
At t ₂ , the measured value becomes “0”. Further left foot B _'1 proceeds according to the arrow b ₂ when the left foot B' ₁ and Measurement for arrow b ₂ the distance between the right leg A ₂ gradually leave the left continue to increase as the l ₃ B At the time t ₄ when landing at the position of ₂ , the measured value becomes the maximum value of L ₂ . In the same manner, the measured distance values are shown in FIG.
As shown in, the increase and decrease are repeated, and the maximum value is reached at the time of landing when the distance between the right foot and the left foot becomes maximum.

Therefore, the walking distance can be measured by adding the maximum values L ₁ , L ₂ , and L _{3 to} L _n of the measured values.

Next, the circuit configuration and operation of the walking distance measuring device of the present invention will be described with reference to FIGS.

FIG. 4 is a block diagram of the main body 1. Reference numeral 20 is an oscillating circuit that oscillates an ultrasonic signal f ₀ , 21 is a count signal f ₁ for distance measurement by dividing the ultrasonic signal ₀ , and a timing signal. f ₂ ,
Frequency divider circuit for outputting f ₃ , 22 is the timing signal
A drive timing signal generation circuit for inputting f ₂ and f ₃ and outputting sampling pulses P _ss at a constant interval shown in FIG. 6 (a), and 23 is an AND gate which operates as a sampling gate. By sampling ₀ with the sampling pulse P _ss , the transmission signal S _s shown in FIG. 6 (b) is output. A driving circuit 24 sends the transmission signal S _s via the ultrasonic wave SM2.

Reference numeral 25 is a reflection signal detection circuit, which is an amplification circuit 26 and a detection circuit.
27, an AND gate 28, and an inverter 29, which detects a reflection signal S _r described later and outputs a reflection pulse P _sr shown in FIG. 6C. _Reference numeral 30 denotes a distance measuring circuit, which is a data type flip-flop 31 (hereinafter abbreviated as D.FF) which outputs the counting gate signal _Pc shown in FIG. 6 (d) to which the sampling pulse _Pss and the reflection pulse _Psr are input. ), An AND gate 32 controlled by the counting gate signal P _c , a distance counter 33 that counts the ultrasonic signal f ₀ passing through the AND gate 32 and outputs distance data, and an OR gate 34.

_{Reference numeral} 40 denotes a maximum data determination circuit, which is used for the reflection pulse P _sr.
The distance data D ₁ from the distance counter 33 is input as a synchronizing signal, the maximum data D _lm is determined from the distance data D _l , and the maximum data D _lm is output.

50 is an integrating circuit, which is an adding circuit 51 and a data memory 52.
And the maximum distance data D _lm and the walking distance data D _w stored in the data memory 52.
And the result is stored in the data memory 52 as new walking distance data D _w . A display drive circuit 60 drives the display device 3 shown in FIG. 1 to display the walking distance data D _w . 70 is a battery, 71 is a power switch controlled by the power button 4, 72 is an initial setting circuit that outputs an initial setting pulse P _r when the power switch 71 is turned on, and the maximum setting data is generated by the initial setting pulse P _r . The determination circuit 40, the integrating circuit 50, the frequency dividing circuit 21, and the D / FF 31 are initialized.

 Next, the structure of the reflector 10 will be described with reference to FIG.

Reference numeral 80 is an oscillation circuit that oscillates the ultrasonic signal f ₀ , 81 is a frequency dividing circuit that divides the ultrasonic signal f ₀ , 82 is a transmission signal detection circuit, and a widening circuit 83, a detection circuit 84, and an AND gate 85. , An inverter 86, detects the transmission signal S _s transmitted from the main body 1, and outputs the trigger pulse P shown in FIG.
Output _rr . _Reference numeral 90 denotes a drive timing signal generating circuit, which inputs the frequency- _divided signal from the frequency-dividing circuit 81 and the trigger pulse P _rr and is synchronized with the _{trailing edge} of the trigger pulse P _rr as shown in FIG. Outputs sampling pulse P _rs . 91 operates as a sampling gate AND
A gate for sampling the ultrasonic signal f ₀
Figure 6 (g) by sampling with _Prs
The reflected signal S _r shown in is output. Reference numeral 92 denotes a drive circuit, which sends out the reflected signal S _r via the ultrasonic wave SM11.

Next, the operation of measuring the walking distance by the main body 1 and the reflector 10 will be described.

First, considering the condition of the count signal f ₁ used for distance measurement, the velocity C _s at which the transmission signal S _s and the reflection signal S _r, which are the ultrasonic signals, propagate in the air is C _s = 331 + 0.6T (m / s) (T is temperature ℃) and the speed C _{ss at} room temperature (24 ℃) is 345.4 [m / s]
Becomes Therefore, the time t _s required for each of the signals S _s and S _r to travel 1 [cm] is t _s = 1/34540 [sec] ≅28.95 (μs). Since the reflection method is adopted, the round trip distance must be measured.
[Cm] The time required to progress is apparently doubled to 2t _s
Therefore, 2t _s ≈ 57.90 [μs]. Therefore, the counting signal f ₁ becomes f ₁ = 1 / 57.90 = 17270 [Hz].

That is, the time interval from the transmission of the transmission signal S _s from the main body 1 to the reception of the reflection signal S _r is the counting signal f ₁ (17
By counting at 270 Hz, it is possible to perform distance measurement in which 1 cm corresponds to 1 count value.

Next, a specific operation will be described with reference to FIGS. First, as shown in FIG. 2, the main body 1 and the reflector 10 are attached to both ankles, and the power buttons 4 and 12 are operated to bring them into an operating state, and then when walking is started as shown in FIG. 3, the main body shown in FIG. 1, the power switch 71 is turned on by operating the power button 4.
As a result, the initial setting circuit 72 outputs the initial setting pulse _Pr at the same time when the power is supplied. Then D · FF 31 and the data memory 52 by the initial setting pulse P _r is, is reset initialized by the frequency divider circuit 21 simultaneously starts dividing operation after being reset.

Then, when the timing signals f ₂ and f ₃ are output from the frequency dividing circuit 21, the drive timing signal generating circuit 22 outputs the timing signals f ₂ and f _{3 in} FIG.
The sampling pulse P _ss shown in is output to open the AND gate 23, close the AND gate 28 via the inverter 29, and further supply it to the φ terminal of the D / FF 31. This result AN
The ultrasonic signal f ₀ that has passed through the D gate 23 is supplied to the drive circuit 24 as the transmission signal S _s shown in FIG.
Will be output. The transmission signal output from the drive circuit 24
S _s is also supplied to the reflected signal detection circuit 25, but is blocked by the AND gate 28 closed by the sampling pulse P _ss . That is, the AND gate 28 prevents the transmission signal S _{s from} being mixed into the reflected signal detection circuit 25 due to the ultrasonic wave SM2 also being used for transmission and reception.

Further, the counting gate signal P _c shown in FIG. 6 (d) is output to the output terminal Q of the D / FF 31 at the falling timing of the sampling signal P _ss supplied to the φ terminal of the D / FF 31. As a result, the AND gate 32 is opened and the distance counter 33 starts counting by the count signal f ₁ that has passed through the AND gate 32.

And the transmission signal S _s output from the ultrasonic wave SM2 is
It is received by the ultrasonic wave SM11 of the reflector 10 and supplied to the transmission signal detection circuit 82. The transmission signal detection circuit 82 widens the supplied transmission signal S _s by the amplification circuit 83 and then makes it a pulse by the detection circuit 84, and the trigger pulse P _rr via the AND gate 85.
Is output. By inputting this trigger pulse P _rr , the drive timing signal generating circuit 90 outputs the sampling pulse P _rs at the falling timing of the trigger pulse P _rr as shown in FIG. It opens and closes the AND gate 85 via the inverter 86.
As a result, the ultrasonic signal f ₀ that has passed through the AND gate 91 is supplied to the drive circuit 92 as the reflection signal S _r shown in FIG.
Output from ultrasonic SM11. The reflected signal S _r output from the drive circuit 92 is also supplied to the transmission signal detection circuit 82,
It is blocked by the AND gate 85 closed by the sampling pulse P _rs .

That is, the AND gate 85 causes the reflected signal S _r to be transmitted to the transmission signal detection circuit 82 when the ultrasonic wave SM11 is also used for transmission and reception.
Are prevented from entering. The reflected signal S _r output from the ultrasonic wave SM11 is received by the ultrasonic wave SM2 of the main body 1 and supplied to the reflected signal detection circuit 25. The reflected signal detection circuit 25 widens the supplied reflected signal S _r by the widening circuit 26 and then makes it pulse by the detection circuit 27, and the AND gate 28
The reflected pulse P _sr is output via. Then, this reflection pulse P _sr resets D · FF31 via the OR gate 34 and is supplied to the maximum data determination circuit 40. As a result, the counting gate signal P _c output to the output terminal Q of the D / FF 31 disappears, and the AND gate 32 is closed, and the counting operation of the distance counter 33 is completed. Then, the count value of the distance counter 33 is supplied to the maximum data determination circuit 40 as distance data D ₁ representing the distance between the main body 1 and the reflector 10, that is, the distance between the right foot and the left foot in cm. Then, the maximum data determination circuit 40 determines whether or not the measured distance data D _l is the maximum data every time the counting operation of the distance counter 33 is completed, and only when the maximum value is the maximum data. D _lm is supplied to the integrating circuit 50. The integrating circuit 50 stores the first maximum data D _lm supplied to the adding circuit 51 in the data memory 52 in the reset state, and supplies the content as the walking distance data D _w to the display drive circuit 60 to display the display device. The walking distance is displayed in 3. Further, the integration circuit 50 adds the maximum data D _lm from the second time supplied from the maximum data determination circuit 40 and the walking distance data D _w stored in the data memory 52 by the addition circuit 51, and the result is added. By re-storing the new walking distance data D _w in the data memory 52, the display value of the display device 3 is increased according to the walking distance.

Next, the specific structure and operation of the maximum data determination circuit 40 shown in FIG. 4 will be described with reference to FIGS. 7 and 8. In FIG. 7, 41 is a maximum value memory, 42 is a reference value memory, 43 and 44 are comparison circuits, 45 and 46 are data transfer circuits, and 47 and 48 are delay circuits, which are supplied from the distance counter 33. Distance data D _l
Is input to the comparison circuits 43 and 44 and the data transfer circuit 45, and the reflected pulse P _sr is input to the comparison circuits 43 and 44 via the delay circuit 47.

The operation of the maximum value determination circuit 40 will be described. When the walking distance data D _l is determined by the reflection pulse P _sr , the comparison circuits 43 and 44 start the comparison operation after a certain stabilization time by the delay circuit 47. The comparison circuit 43 compares the newly input distance data D _l with the maximum data D _lm stored in the maximum value memory, and outputs a transfer pulse Pt ₁ when D _l > D _lm. The data transfer circuit 45 is operated to store the new distance data D _l in the maximum value memory 41 as new maximum data D _lm . And this operation is reflected pulse P _sr
The final maximum value D _lm is stored in the maximum value memory 41 by repeating each input of. The reference value memory 42 stores the reference distance data D _ls having a relatively small value, and the comparison circuit 44 stores the distance data D _l for each reflection pulse P _sr.
And the reference distance data D _ls are compared, and when D _l <D _ls , the transfer pulse Dt ₂ is output, thereby operating the data transfer circuit 46 and operating the maximum data stored in the maximum value memory 41.
D _lm is transferred to the integrating circuit 50. The transfer pulse Pt ₂ is delayed by the delay circuit 48 for the time required to complete the transfer operation, and then the maximum value memory 41 is reset to start the determination of the next maximum value data.

Further explaining the above operation with reference to FIG. 8, FIG. 7 (a) corresponds to FIG. 3 (c), and shows a state in which the distance data D _l changes in accordance with the walking motion.
D _ls is reference distance data stored in the reference value memory 42. This value creates the timing to transfer the determined maximum data D _lm , and the condition is that it is a value that is sufficiently smaller than the expected maximum data (pedestrian's stride). It is also possible to minimize.

FIG. 8B shows a change in the stored data in the maximum value memory 41 in accordance with the input of the distance data D ₁ shown in FIG. That is, since the first C ₁ section is D ₁ / D _1s , the comparison circuit 44 resets the maximum value memory by outputting the transfer pulse Pt ₂ , so that the stored data is zero. At this time, the transfer operation is instructed to the data transfer circuit 46 by the transfer pulse Pt ₂ , but since the stored data is zero, the data transfer is not performed. Then C ₂
Since the transfer pulse Pt ₂ is no longer output because D _l > D _ls in the interval, and the reset of the maximum value memory 41 is released, the maximum value determination operation by the comparison circuit 43 and the data transfer circuit 45 is started. Since the distance data D _l increases, the comparison circuit 45 outputs the transfer pulse Pt ₁ every time and outputs the maximum value memory 41.
The stored data of is rewritten every time. As a result, an increasing characteristic is obtained as shown in FIG. Next, in the C ₃ section, since the maximum value data D _lm is stored in the maximum value memory 41 and the distance data D _l is decreased, the maximum value determination operation is continued, but the transfer pulse Pt ₁ is It is no longer generated, and the stored data in the maximum value memory 41 is fixed to the maximum value D _lm .

Then, in the next C ₁ section, the transfer pulse Pt ₂ is output from the comparison circuit 44 because D ₁ <D _ls . As a result, the data transfer circuit 46 is activated to output the maximum data D _lm stored in the maximum value memory 41, and after a slight delay time, the maximum value memory 41 is reset to complete one step measurement. .

Then, the distance of each stride is measured by repeating the above operation, and it is output as the maximum data D _lm . The above is the configuration of the walking distance measuring device in the present invention, and in the present embodiment, the configuration is such that it is attached to the ankles of the main body 1 and the reflector 10.
It is not limited to this, it may be attached to shoes,
It is also possible to build it into shoes.

〔The invention's effect〕

As described above, the walking distance measuring device of the present invention is an ankle,
Accurate measurement of walking distance is possible just by wearing it on shoes, and exercises and hobbies based on walking can be further enhanced, which is extremely effective for modern health management.

[Brief description of drawings]

The drawings are all related to the present invention. FIG. 1 is an external view of a walking distance measuring device, FIG. 2 is a state diagram showing a state of being mounted on the body, and FIG. 3 is for explaining the principle of walking distance measuring. Time chart, Figure 4 is a block diagram of the main body,
FIG. 5 is a block diagram of the reflector, FIG. 6 is a time chart, FIG. 7 is a block diagram of the maximum data judging circuit, and FIG.
The figure is a time chart for explaining the operation of the maximum data determination circuit. 1 ... Main body, 2, 11 ... Ultrasonic speaker, microphone, 10 ... Reflector, 30 ... Distance measuring circuit, 40 ... Maximum data judgment circuit, 50 ... Integration circuit.

Claims (1)

(57) [Claims] 1. A body which is attached to one foot and outputs an ultrasonic transmission signal, and a reflector which is attached to the other foot and outputs the ultrasonic reflection signal by detecting the ultrasonic transmission signal. A distance measuring circuit that measures the distance between the main body and the reflector by starting counting in synchronization with the ultrasonic transmission signal and ending counting in synchronization with the ultrasonic reflection signal, and the distance. Walking distance measurement including a maximum data determination circuit that determines maximum data from distance data continuously measured by a measurement circuit, and an integrating circuit that integrates the maximum data to calculate walking distance data apparatus.