JPH0576502A - Electromagnetic induction communication system - Google Patents

Abstract

PURPOSE:To provide the electromagnetic induction communication system which can respectively distinguishably receive signals transmitted from plural transmitters. CONSTITUTION:A step signal transmitter transmits step signals according to the electromagnetic induction signal of a frequency f0, and a pulse signal transmitter transmits electrocardiographic waveform signals according to the electromagnetic induction signal of a frequency f1. A receiving circuit 18 of a watch receives the electromagnetic induction signals detected by a coil 17 and outputs electromagnetic induction signals (a) to band pass filters (BPF) 19 and 20. The BPF 19 extracts the signal component of the frequency f0 from the electromagnetic induction signal (a) and outputs an output signal (b) as the step signal to a control part 21. The BPF 20 extracts the signal component of the frequency f1 from the electromagnetic induction signal (a) and outputs an output signal (c) as the electrocardiographic waveform signal to the control part 21. The control part 21 separately detects the step signal and the electrocardiographic waveform signal, counts the number of steps and calculates the pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction communication system.

[0002]

2. Description of the Related Art When exercising such as running or jogging, a pedometer is attached to count the number of steps. Further, it is effective to measure the physical condition and exercise capacity of the body by simultaneously measuring the heart rate during exercise.

[0003]

In this case, since the pedometer is attached to the waist belt or shoes, it is impossible to know how many steps are taken during exercise. Further, since the electrode for detecting the heart rate is attached to the surface of the body, the heart rate meter main body having the display unit and the electrode must be connected with a cord, and the cord is an obstacle during exercise. Therefore, there is a demand for a system that can receive a signal from a pedometer or a heart rate monitor without using a code.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electromagnetic induction communication system capable of individually receiving signals transmitted from a plurality of transmitters.

[0005]

In order to solve the above problems, the present invention comprises a plurality of transmitters for transmitting signals by electromagnetic induction and a receiver for receiving the signals transmitted from the plurality of transmitters. In the electromagnetic induction communication system, the plurality of transmitters each transmit a signal at a different unique frequency, and the receiver includes a plurality of band-pass filters for extracting different frequency components. To do.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a circuit configuration of a step number signal transmitter to which the present invention is applied. In this case, the step number signal transmitter is attached to a waist belt or shoes. The vibration sensor 1 outputs a sensor voltage according to the strength of vibration caused by walking or running, and outputs a sensor voltage as shown in FIG. The detection circuit 2 waveform-shapes the sensor voltage and outputs a detection signal as shown in FIG. 2B to the induction signal generation circuit 3. The induction signal generation circuit 3 generates an electromagnetic induction signal (magnetic induction signal) having a frequency f0 as shown in FIG. 2C based on the detection signal output from the detection circuit 2 and outputs it to the transmission circuit 4. The transmission circuit 4 transmits the electromagnetic induction signal output from the induction signal generation circuit 3 from the coil 5. The electromagnetic induction signal transmitted from the coil 5 can be sufficiently detected if the receiving means is located at a distance of up to about 2 m. The power supply circuit 6 uses the battery 7 as a power supply, and the vibration sensor 1, the detection circuit 2,
A drive voltage is supplied to each part of the induction signal generation circuit 3 and the transmission circuit 4.

FIG. 3 is a block diagram showing a circuit configuration of a heartbeat signal transmitter to which the present invention is applied. In this case, the heartbeat signal transmitter is stored in a chest pocket of a jacket worn by the subject. The ECG electrodes 9 are a pair of electrodes that are attached to the body of the subject and detect the electrocardiographic waveform (ECG) of the subject. E
The CG electrode 9 is connected to the detection circuit 10, as shown in FIG.
An electrocardiographic waveform as shown in (A) is output to the detection circuit 10. The detection circuit 10 shapes the electrocardiographic waveform output from the ECG electrode 9 and outputs a detection signal as shown in FIG. 4B to the induction signal generation circuit 11. Induction signal generation circuit 11
4 based on the detection signal output from the detection circuit 10.
An electromagnetic induction signal of frequency f1 as shown in (C) is generated and output to the transmission circuit 12. The transmission circuit 12 uses the electromagnetic induction signal output from the induction signal generation circuit 11 as a coil 13
Send from The electromagnetic induction signal transmitted from the coil 13 can be sufficiently detected at a distance of up to about 2 m. The power supply circuit 14 uses the battery 15 as a power supply, and through the switch 16, the ECG electrode 9, the detection circuit 10, the induction signal generation circuit 1
1, and a drive voltage is supplied to each part of the transmission circuit 12.

FIG. 5 is a block diagram showing a circuit configuration of a wrist watch to which the present invention is applied. In this case, the wristwatch is a receiver that receives electromagnetic induction signals transmitted from the step number signal transmitter and the heartbeat signal transmitter, and is worn on the subject's wristwatch. The coil 17 receives an electromagnetic induction signal and is connected to the receiving circuit 18. The receiving circuit 18 is the coil 17
The electromagnetic induction signal received by is received by the band pass filter (BPF1) 19
And to the band pass filter (BPF2) 20. The electromagnetic induction signal a output from the receiving circuit 18 is
As shown in FIG. 6A, it is composed of a signal component of frequency f0 from the step number signal transmitter of FIG. 1 and a signal component of frequency f1 from the heartbeat signal transmitter of FIG.

The band pass filter 19 attenuates the signal components other than the frequency f0 from the electromagnetic induction signal a to extract the signal component of the frequency f0 as shown in FIG. The rectangular wave signal F0 shown in () is output to the control unit 21. The band pass filter 20 attenuates the signal components other than the frequency f1 from the electromagnetic induction signal a to extract the signal component of the frequency f1 shown in FIG.
An output signal F1 as shown in (E) is output to the control unit 21.

Returning to FIG. 5, the control unit 21 is a central processing unit that controls each unit based on a microprogram stored in the ROM 22 in advance and performs various processes. The RAM 23 is a memory that stores various data, and details will be described later with reference to FIG. 7.

The key input unit 24 is provided with K1 to K3 keys (not shown) and other keys, and outputs a key input signal corresponding to a key operation to the control unit 21. Where K1
The key is a key for inverting the mode by inverting the contents of the mode register M described later. The K2 key is a key for inverting the contents of the flag register F described later. The K3 key is a key for executing the storing process.

The display unit 25 is composed of, for example, a liquid crystal display element, and displays the current time, the number of steps, the pulse, etc. based on the display data output from the control unit 21. The oscillator circuit 26 oscillates a clock signal of a predetermined frequency and inputs it to the frequency dividing / timing circuit 27. The frequency division / timing circuit 27 divides the clock signal input from the oscillation circuit 26, generates various timing signals such as a clock signal, and supplies them to each unit.

FIG. 7 is a diagram showing a memory configuration of the RAM 23 in FIG. In the figure, the display register is a register for storing display data displayed on the display unit 25, and the mode register M is a register for storing mode data. In this case, "M = 0" is the time display mode, and "M = 1" is the measurement mode. The clock register is a register that stores current time data that is sequentially updated by a clock process described later. The stride register is a register that stores the stride of the subject. The step count register is a register for counting step count data during exercise. The distance register is a register that stores the distance obtained by multiplying the step length and the number of steps. The flag register F stores a flag indicating the execution state of the measurement process. The pulse register is a register that stores measured pulse data. Register P
Is a pointer for designating one of the data registers N0 to Nn described later. The register T is a register for measuring the cycle THP of the cardiac radio signal as shown in FIG. The register C is a register for storing time data of exercise. Each of the data registers N0 to Nn has an area X for storing time data, an area Y for storing distance data, and an area Z for storing pulse data.

Next, the operation of the above embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing the operation of the wristwatch. Normally, the control unit 21 is in the HALT state of step S1 and waits for the output of the time signal and the key input.

Then, when the clock signal is output from the frequency dividing / timing circuit 27, steps S1 to S2 are performed.
Proceed to. In the time counting process of step S2, the current time data stored in the time counting register of the RAM 23 is updated. In the following step S3, it is determined whether "M = 1", that is, the content of the mode register M is "1". Step S
If YES is determined in step 3, the process proceeds to step S4, and if NO, the process proceeds to step S12.

If "M = 1", the process proceeds from step S3 to step S4, and it is determined whether "F = 1", that is, the content of the flag register F is "1". YES in step S4
If NO, the process proceeds to step S5, and if NO, the process proceeds to step S12.

If "F = 1", the process proceeds from step S4 to step S5. In step S5, a time measuring process for updating the time data of the register C is executed. As a result, time data when “F = 1”, that is, exercise time data is measured.

In the next step S6, reception processing is executed. That is, the receiving circuit 18 detects the electromagnetic induction signal received by the coil 17 and outputs the electromagnetic induction signal a to a band.
Pass filter 19 and band pass filter 20
Output to. The band pass filter 19 outputs the signal b obtained by extracting the signal component of the frequency f0 from the electromagnetic induction signal a to the control unit 21 as the step number signal F0. The band pass filter 20 outputs the signal c obtained by extracting the signal component of the frequency f1 from the electromagnetic induction signal a to the control unit 21 as the electrocardiographic waveform signal F1.

As described above, even if electromagnetic induction signals are simultaneously transmitted from the step number signal transmitter and the heartbeat signal transmitter, since the frequencies are different, the band pass filters (band filters) 19 and 20 generate respective signal components. It is extracted and received as a separate detection signal.

In the following step S7, it is judged whether or not the step number signal F0 from the step number signal transmitter is received. If YES is determined in step S7, the process proceeds to step S8, and if NO is determined, the process proceeds to step S10.

When the step count signal F0 is received, the content of the step count register of the RAM 23 is incremented by 1 in step S8, and the step count data is counted. In the next step S9, distance calculation is executed, and the distance is calculated based on the stride data and the step count data. In step S10, it is determined whether the electrocardiographic waveform signal F1 transmitted from the heartbeat signal transmitter has been received. Step S1
If YES is determined in step 0, the process proceeds to step S11,
If NO, the process proceeds to step S12.

When the electrocardiographic waveform signal is received, the process proceeds from step S10 to step S11. In step S11, pulse calculation processing is executed. That is, the cycle THP from the previous cardiac radio signal to the current cardiac radio signal is the register T
The pulse data is calculated based on this measurement time. RAM2 calculated pulse data
3 is stored in the pulse register. The process proceeds from step S11 to step S12.

In the display process of step S12, display data according to the mode is displayed. For example, in the time display mode, the current time is displayed on the display unit 25, and in the measurement mode, the time data of the register C, the data stored in the pulse register, the distance register, and the step count register are displayed on the display unit 25. After execution of step S12, the process returns to step S1. Thereafter, in the measurement mode, the step count data and the pulse data are calculated in the same manner as described above.

In the key input section 24, the K1 to K3 keys,
When any other key is operated, the process proceeds from step S1 to step S13. In step S13, it is determined whether the K1 key has been operated. If YES is determined in step S13, the process proceeds to step S14, and if NO is determined, the process proceeds to step S15.

If the K1 key is operated, step S1
4, the contents of the mode register M are inverted, and "0 →
1 ”or“ 1 → 0 ”. After the execution of step S14, the process proceeds to the display process of step S12.

If any key other than the K1 key is operated, the process proceeds from step S13 to step S15. In step S15, it is determined whether the K2 key has been operated. If YES in step S15, the process proceeds to step S16, and if NO in step S15, the process proceeds to step S17.

When the K2 key is operated, step S1
From 5 to S16, the content of the flag register F is inverted and becomes "0 → 1" or "1 → 0". After execution of step S16, the process proceeds to step S12.

When any key other than the K1 and K2 keys is operated, steps S13 to S15, S
Proceed to 17. In step S17, it is determined whether the K3 key has been operated. YES in step S17
In case of NO, the process proceeds to step S18, and in case of NO, the process proceeds to step S20.

When the K3 key is operated, step S1
It progresses from 7 to step S18. In step S18, "M
= 1 and F = 1 "is determined. If YES, the process proceeds to step S19, and if NO, the process proceeds to step S12.

When "M = 1, F = 1", step S19
Then, the storage process is executed. That is, each area X of the data registers N0 to Nn designated by the register P,
The time data of the register C, the distance data of the distance register, and the pulse data of the pulse register are stored in Y and Z. This makes it possible to store the exercise time, its distance, and pulse data at the end of the exercise. After execution of step S19, the process proceeds to step S12.

If another key is operated in step S17, the process proceeds to step S20, and another key process, for example, a process of updating the register P or clearing the data of each register is executed. It The process proceeds from step S20 to step S12.

In the above embodiment, the receiver is applied to a wrist watch, but the present invention is not limited to this, and other electronic equipment may be used as the receiver. Further, the data to be transmitted is not limited to the cardiac wave and the number of steps. Further, the number of transmitters may be three or more, and in that case, each transmitter may be prioritized.

[0033]

According to the present invention, it is possible to provide an electromagnetic induction communication system capable of individually receiving signals transmitted from a plurality of transmitters.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit configuration of a step number signal transmitter.

FIG. 2 is a diagram showing an output state of each signal.

FIG. 3 is a diagram showing a circuit configuration of a heartbeat signal transmitter.

FIG. 4 is a diagram showing an output state of each signal.

FIG. 5 is a diagram showing a circuit configuration of a wristwatch.

FIG. 6 is a diagram showing an output state of each signal.

FIG. 7 is a diagram showing a memory configuration.

FIG. 8 is a flowchart showing an operation.

[Explanation of symbols]

 1 ... Vibration sensor 2 ... Detection circuit 3 ... Induction signal generation circuit 4 ... Transmission circuit 5 ... Coil 9 ... ECG electrode 10 ... Detection circuit 11 ... Induction signal generation circuit 12 ... Transmission circuit 13 ... Coil 17 ... Coil 18 ... Reception circuit 19 , 20 ... Band pass filter 21 ... Control unit

Claims (1)

[Claims] 1. An electromagnetic induction communication system comprising a plurality of transmitters for transmitting signals by electromagnetic induction, and a receiver for receiving the signals transmitted from the plurality of transmitters, wherein the plurality of transmitters are provided. An electromagnetic induction communication system, wherein each receiver transmits a signal at a different specific frequency, and the receiver includes a plurality of band filters for extracting different frequency components.