JPH09107325A - Wireless message communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the wireless message communication system in which power consumption is reduced without crosstalk of a message from a master station received by a visitor and without an excessive operation to receive the desired message. SOLUTION: A system manager operates a master station 1 via an input output device 5 to send a message to persons each carrying a slave station 2. A power supply of a radio system receiver 7 of each slave station 2 is usually interrupted. Prior to the transmission of a message from a radio system transmitter 4, the master station 1 uses an electromagnetic induction system radio equipment 3 whose communication range is narrow to send a signal relating to a start signal and a message transmission frequency of a radio system receiver 7 of the slave station 2 to the slave station 2 through the communication of the electromagnetic induction system. The radio system receiver 7 is started to receive a message sent from the radio system transmitter 4 of the master station 1 and to provide an output from an input output section 8. The power supply of the radio system receiver 7 is interrupted when it finishes output of the message.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for guiding a message such as guidance to a destination in an amusement park or a public facility.

[0002]

2. Description of the Related Art In amusement parks, public facilities, etc., there are the following conventional systems for guiding visitors to a desired place.

When a visitor does not carry a portable terminal or the like, it is general that the approach of the visitor is detected by a sensor such as infrared rays and a message is announced by an announcement in the hall.

On the other hand, when it is possible to allow a visitor to carry a mobile terminal having a speech synthesis IC or the like built therein, such a mobile terminal is handed over at the time of attendance, and when a message is required, the visitor is required. There is a way to get people to listen to the messages sent from the terminal when they want, such as pressing buttons. In addition, a mobile terminal (slave station) having a receiving means such as an FM receiver is carried by a visitor, and a message is periodically sent from the master station by using wireless communication means, and the mobile terminal is used. It is also possible to have the visitors hear the message sent from the parent station.

In order for the visitor to hear the desired message, the master station should send several messages on different frequencies, or the slave station should send the desired message to the master station. There is a method of providing a means for enabling the data communication from the slave station to the master station in order to convey to the master station. Infrared communication or the like is used as a communication means from the slave station to the master station.

[0006]

In a system that detects the approach of a visitor and starts transmitting a message by an electric wave or an announcement in the venue, when a visitor catches up with the predecessor, the explanation of the message of the predecessor is made on the way. There is also a possibility that you will hear from other than the desired master station, you may not hear the voice you want to hear clearly, or you may misunderstand the content of the message, etc. Cause

In addition, in the case of having a visitor carry a portable terminal and using a radio wave radio communication means such as FM, generally, each master station has the same channel for transmitting a message, Because the separation of the message transmission channel between different master stations is not enough,
Since the range of radio waves is wide and it is easily affected by the surrounding environment, the communication area between the master station and other master stations overlaps, and again, the voice cannot be clearly heard, the message content is mistakenly recognized, etc. Will be confused.

In order to allow the visitor to receive a desired message from the master station, when infrared communication is used as a means for transmitting a message from the slave station to the master station, the installation position of the master station is confirmed, and in this direction Visitors must be requested to perform actions such as pointing the terminal or placing the terminal in a fixed position.

Further, when a mobile terminal to be carried by a visitor is provided with a voice guide output means such as an IC for voice synthesis, or when a radio wave receiver such as an FM receiver is used as a constant reception standby state. In the case of the radio wave type radio, since the power consumption is large, the battery life becomes short.

Therefore, it is an object of the present invention to suppress power consumption without a message received by a visitor from a master station interfering with each other and an extra operation for receiving a desired message. It is to provide a wireless message communication system capable of performing.

[0011]

In order to solve the above-mentioned problems, the area for communication between the master station and the slave station is restricted by using the guiding radio means which can easily limit the communication area of the master station, and It is effective to perform control so that the timing at which the station receives the message matches the timing at which the master station transmits the message.

Such control can be realized by using two radios, an induction radio based on an electromagnetic induction system for detecting a slave station and a radio based on a radio wave system for communicating a message. Is.

Therefore, the slave station in the system of the present invention receives the message from the master station by the radio wave method according to the induction radio means for performing data communication with the master station by the electromagnetic induction method and the content of the data communication. And means.

Similarly, the master station also has induction radio means for performing data communication with the slave station by an electromagnetic induction method, and transmitting means for transmitting a message to the slave station by a radio wave method according to the contents of the data communication. Equipped with.

That is, the communication system of the present invention is a communication system for transmitting a message to a person who carries a child station by wireless communication means of a plurality of scattered parent stations. Induction wireless means using an electromagnetic induction method for communication, and wireless communication means using a radio wave method for transmitting a message to a slave station, and the slave station is an induction wireless method using an electromagnetic induction method for performing data communication with a master station. Means and a radio communication means for receiving a message from the master station, and when the person carrying the slave station comes within the communication range of the guided wireless communication means of the master station, the slave station First, the data communication with the station is performed, and then the message communication by the radio wave method is performed according to the content of the data communication.

Thus, the induction radio means of the electromagnetic induction system is provided in the slave station and the master station so that the slave station exchanges data necessary for receiving a message from the master station. For example, the data transmitted from the master station to the slave station by the electromagnetic induction method is the frequency channel used when transmitting a message by the radio wave method, or the power of the radio communication means or the receiving means of the radio wave method of the slave station is turned on. And the like.

Since the electromagnetic induction type radio can make the communication range much smaller than that of the radio wave type, the communication range can be limited only to a very limited area around the parent station, and the parent station performing communication at the same frequency. It is possible to prevent the signals transmitted from the respective master stations from interfering with each other even if they are provided relatively close to each other.

On the slave station side, the radio communication means or the receiving means of the radio wave system, which usually consumes a large amount of power, is turned off, and the induction radio means is always turned on. Since the inductive wireless means consumes less power than the radio wave type wireless communication means, even if the power is always turned on, the power consumption is lower than that when the radio wave type wireless communication means is always used. The battery life can be extended when the battery is used as the power source of the slave station, for example.

When the person carrying the child station enters the electromagnetic communication system of the parent station, the data is received from the parent station and the radio communication means or the receiving means of the radio wave is turned on. , Receive a message from the master station.
In this case, the power is turned off again when the message from the master station ends. With this configuration, the message from the master station can be reliably heard from the beginning to the end, and the message will not be heard halfway.

When the master station can send a message on a plurality of frequency channels, the slave station uses the guided radio means to send channel selection data to the master station, and the master station is requested according to this data. The message is transmitted by radio wave on the specified frequency channel. By sending a different message for each frequency channel, the mobile phone of the slave station can select and listen to the message that it wants, enabling two-way communication between the master station and the slave station. .

Further, if the same message is transmitted on each frequency channel, it is possible to alleviate the problem of waiting a long time until the message starts when the number of visitors is very large.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining the principle of the present invention. The wireless message communication system of the present invention includes a master station managed by a system administrator and a slave station which is a mobile terminal carried by a visitor of an amusement park, for example. Multiple slave stations are generally prepared, and the master station is
Depending on the configuration of the equipment in which this system is installed, there may be one or a plurality of cases. The description of the present invention is mainly made with the facility of the attraction of the amusement park in mind, but the application is not limited to this, and for example, a child station having a time card function at the entrance of a car parking lot can be used. It is also possible to use it by giving it to the driver and guiding it to an empty parking space.

As shown in the figure, the master station 1 has an electromagnetic induction type radio 3 having a loop coil antenna 9-1.
And a radio wave transmitter 4 having an antenna 10-1, and an input / output device 5 serving as an interface for the system administrator to control the master station 1. Further, the slave station 2 includes an electromagnetic induction type radio device 6 having a loop coil antenna 9-2.
And a radio wave receiver 7 having an antenna 10-2, and an input / output unit 8 for notifying a carrier of the slave station 2 of information and inputting data to be transmitted to the master station 1.

The master station 1 uses a loop coil with a signal for activating the radio wave type receiver 7 of the slave station 2 from the electromagnetic induction type radio device 3 having a narrow communication range and data regarding the frequency of a channel for transmitting a message. It transmits from the antenna 9-1. On the side of the slave station 2, the power of the radio wave type receiver 7 is normally off, and only the electromagnetic induction type radio device 6 is always in the receiving state. The signal transmitted from the loop coil antenna 9-1 of the master station 1 is received by the loop coil antenna 9-2 of the slave station 2, decrypted by the electromagnetic induction system radio 6, and controlled by a processor (not shown). The receiver 7 is activated and the frequency at which the message is transmitted is automatically tuned.

In this way, the radio wave receiver 7 on the side of the slave station 2 is in the reception standby state. On the other hand, in the master station 1, when the radio device 3 of the electromagnetic induction system transmits the activation signal of the radio wave receiver 7 of the slave station 2, the radio wave transmitter 4 continuously transmits a message signal on a predetermined frequency. To do. On the side of the slave station 2, the radio wave receiver 7 tuned to the predetermined frequency receives the radio wave from the master station 1 and outputs a message from the input / output unit 8. After outputting the message,
The radio wave receiver 7 on the slave station 2 side is automatically turned off and turned off. The carrier of the child station 2 determines his or her course in attractions such as a maze based on the message thus obtained.

Here, since the wireless communication range of the electromagnetic induction system is narrower than that of the radio wave system, when a plurality of master stations 1 are provided, even if the master stations are brought relatively close to each other, the electromagnetic induction system The communication ranges can be made non-overlapping. Then, the receiver 7 is activated immediately before receiving a message from the master station 1 in response to an instruction by the electromagnetic induction system communication, so that it is possible to prevent interference of messages from other master stations.
When the slave station 2 is a portable type, it is considered that a battery is used as a power source in many cases, but since the receiver 7 of the radio wave method which consumes a large amount of power is activated only when receiving a message, power consumption is reduced. It can be suppressed to prolong the battery life and reduce the burden on the system administrator.

Further, since a signal for starting and tuning the radio wave receiver 7 is transmitted to the slave station 2 before the master station 1 sends a message, the slave station 2 in the slave station 2 receives the signal. You can listen to the message from the first time without omission. When the master station 1 is configured to transmit different messages on different frequency channels, the electromagnetic induction system radio 6 requests the master station 1 to transmit the message desired by the visitor. 1 sends a signal to the slave station 2 for tuning the frequency of the message desired by the visitor. This allows visitors to hear their desired message.

FIG. 2 is a block diagram showing the configuration of the master station of the system according to the embodiment of the present invention. The master station shown in the figure has an induction radio 13 based on an electromagnetic induction system and a transmitter 14 based on a radio wave system. Induction radio 3
A loop coil antenna 11 for communication by an electromagnetic induction system is provided.
To communicate with a slave station (a mobile terminal carried by a visitor) similarly having an induction wireless device.

The induction radio 13 includes encoders 13-1,
It includes a decoder 13-3, a protocol control unit 13-2, a transmission / reception unit 13-4 having a signal modulation / demodulation and detection function, and a waveform analysis unit 13-5.

The host computer 16 has a role of an interface with the system administrator, and controls the MPU 15 for communication control of the master station. The MPU 15 performs switching and control of the electromagnetic induction type induction wireless device 13 and the radio wave type transmitter 14, and memory control for transmission data.

Upon receiving the transmission data from the MPU 15, the guide wireless device 13 sets the transmission data to a protocol in which the encoder 13-1 can transmit the transmission data under the control of the protocol control unit 13-2. It is modulated by -4 and transmitted from the loop coil antenna 11. When data from the slave station is received by the loop coil antenna 11,
The transmission / reception unit 13-4 detects / demodulates, and the waveform analysis unit 13-
After being subjected to waveform analysis in 5, the data is converted into data that can be handled by the MPU 15 by the decoder 13-3 under the control of the protocol control unit 13-2 and sent to the MPU 15.

Since the induction wireless device 13 is a communication system that utilizes a magnetic field component having a large amount of attenuation in electromagnetic waves, it is relatively possible to form a narrow communication area by devising the shape and installation location of the antenna. It is well known that this can be easily achieved. For example, the loop coil antenna 11 has a length of about 25 m when the frequency used in communication of the electromagnetic induction system is 300 kHz, and has a loop coil shape (spiral shape) so as to keep the occupied area small. It Further, the communication range of the induction wireless device 13 can be considerably several tens cm to 2 or 3 m, which is considerably narrower than that of the radio wave system, though it depends on the loop diameter of the loop antenna and the output power. In addition, the transmission antenna 12 of the radio wave system,
For example, it is a dipole antenna or a linear antenna used for FM radio or the like.

The induction wireless device 13 transmits, as data, a start signal of a radio wave type receiver of a slave station (described later) and a frequency channel for this receiver to perform reception. The radio wave transmitter 14 transmits a message using the radio frequency channel specified by the induction radio device 13.

The radio wave type transmitter 14 is a PLL (phase l
ocked loop) 14-1, low-pass filter 14-2, self-excited oscillator 14-3, modulator 14-4, band-pass filters 14-5 and 14-7, and mixers 14-6 and 14-8. The PLL frequency synthesizer (comprising the PLL 14-1, the low-pass filter 14-2, and the self-excited oscillator 14-3) of the transmitter 14 sets the transmission frequency of the transmitter 14 according to the signal from the MPU 15, and the signal is transmitted from the MPU 15. The signal is converted into voice data by the voice synthesizing IC 17, and this data is amplified by the voice driver 18 and sent to the transmitter 14. This audio signal is modulated by the modulator 14-4, and the two band pass filters 1
The signal is transmitted from the transmission antenna 12 via the mixers 4-5, 14-7 and the two mixers 14-6, 14-8.

The signal transmitted from the radio wave transmitter 14 may be a voice signal, a character, an image signal, or the like. For example, the voice signal is obtained by digitizing voice by PCM modulation or the like.

Regarding the transmission timing of the two radios of the guide radio 13 and the radio wave transmitter 14, it is assumed that the transmitter 14 starts the transmission of the guide message when the data transmission by the guide radio 13 is completed. It is something that is repeated on a regular basis. It is desirable that no master station uses the same transmission frequency channel of the transmitter 14 in the same system, but if the number of installed master stations is greater than the number of transmission frequency channels of the transmitter 14, the same frequency is used. The frequencies will be reused by installing them in separate locations so that signal interference between master stations with channels is sufficiently small.

FIG. 3 is a block diagram showing the configuration of a slave station of the system according to the embodiment of the present invention. The slave station is an induction radio 23 and a receiver 24 whose reception frequency channel can be automatically changed.
Having. The induction coil 23 has a loop coil antenna 2
1, the receiver 24 is provided with the receiving antenna 22, and both are controlled by the MCU 25. here,
The receiving antenna 22 is similar to that of the master station,
For example, a dipole antenna or a linear antenna.

Loop coil antenna 21 and induction radio 2
Since 3 is the same as that of the master station in FIG. 2, its explanation is omitted. When the induction wireless device 23 receives the information on the transmission frequency from the transmitter 4 of the master station, the MCU 25 makes the PLL 24
The signal for tuning the receiver 24 is input to -1. P
LL24-1, LPF24-2, VCO (self-excited oscillator)
The circuit composed of 24-3 generates a signal having a frequency matching the frequency of the transmitted radio wave, and the mixer 24-
Enter 8 The radio wave received by the receiving antenna 22 is combined with the signal from the VCO 24-3 by the mixer 24-8,
Band pass filter 24-7, 24-5, mixer 24-
After passing 6, the audio signal is demodulated by the demodulator 24-4, amplified by the audio driver 27, and output from the output device 29. The signal transmitted from the master station is not limited to a voice signal, and may be a signal for outputting characters or the like.
Therefore, as the output device 29, not only a speaker for audio output but also a liquid crystal screen or the like capable of outputting characters and pictures can be provided.

Further, the child station is provided with an input device 28 for transmitting information so that a visitor can send a desired message to the parent station as an interface with the child station carrier. The input device 28 is, for example, a numeric keypad.

The power source 30 is, for example, a battery, and the MCU
Power is supplied to circuits with high power consumption such as the receiver 24 and the audio driver 27 via a power switch 26 controlled by 25.

On the slave station side, normally, only the induction radio 23 is supplied with power, and the receiver 24 is the induction radio 23.
Power is supplied only when the device receives data from the master station, and the device is in a reception standby state. This receiver 24 is a PLL frequency synthesizer (PLL) capable of automatically setting a reception frequency.
24-1, LPF 24-2, VCO 24-3)
The reception frequency of the receiver 24 is changed by the data of the frequency channel received by the induction wireless device 23. The reception standby state ends at the timing when the receiver 24 receives all the messages, and the power supply to the receiver 24 ends. The control such as the ending timing is performed by using the timer function of the MCU 25. The MCU 25 controls the receiver 24 and the audio driver 27 to be turned off when a message end signal is received from the master station. It is possible to do. Thus, the control on the slave station side can be easily realized by incorporating a microcomputer such as the MCU 25.

According to the above configuration, the visitor cannot hear the message unless the slave station (portable terminal) receives the wireless data from the master station by the electromagnetic induction method. Even if you enter the communication area of the same parent station, you will not hear from the middle of the message.

Since the peculiar frequency channel can be used in each master station by the data communication by the electromagnetic induction type radio, there is no possibility that the message from the master station other than the master station desired by the visitor is interfering.

Further, in the wireless device, where power consumption is large,
A mixer unit that modulates and demodulates data and an amplifier unit that amplifies a signal,
The detection ICs and the like generally consume more power as the operating frequency is higher and when communicating with a distant place. Compared to the radio wave method, the electromagnetic induction method consumes less power because the frequency used is considerably lower. In addition, since it is difficult to say the difference in power consumption between the electromagnetic induction method and the radio wave method due to various communication distances and configurations, the electromagnetic induction method is generally a few tenths of the radio wave method. It can be said that the power consumption is small. Therefore, since the radio wave receiver that consumes a lot of battery has a circuit configuration that operates only when it passes through the electromagnetic induction wireless communication area of the parent station, the battery replacement period on the child station side is extended and the burden on the system provider is increased. It is possible to reduce

FIG. 4 is a block diagram showing the structure of the PLL frequency synthesizer. In this PLL frequency synthesizer, the signal of frequency f1 oscillated from the self-excited oscillator 31 is fed back and input to the phase comparator 32. The self-excited oscillator 31 is an oscillation circuit that oscillates at a frequency commensurate with the input voltage. The signal of frequency f1 fed back from the self-excited oscillator 31 is M from the input side.
Frequency f2 input by PU (or MCU)
Is input to the phase comparator 32. The phase comparator 32 compares the signal of the frequency f1 with the signal of the frequency f2, creates a signal from which extra noise and high frequency are removed by the low pass filter 33 in the next stage, and sends this signal to the self-excited oscillator 31 again. The voltage of this signal is input to control the oscillation frequency of the self-excited oscillator 31. By this PLL feedback loop, stable oscillation can be performed and a signal of a constant frequency can be supplied to the output side. Further, the feedback path 35 is provided with a programmable variable frequency divider 34 so that the oscillation frequency can be freely set. FIG.
In the third embodiment, the control of the variable frequency divider 34 is also M
It is configured to be performed by PU or MCU.

FIG. 5 shows an example in which the present invention is applied to an attraction system such as a maze in an amusement park. The visitor selects a traveling direction based on messages from the master station installed at a plurality of branch points in the maze.

In this system, the master station A is provided at each branch point.
Is installed. Each master station A has a built-in induction radio device having the same frequency as shown in FIG. 2 and a transmitter using radio waves of a specific frequency channel. It is desirable that the distances between the respective master stations A are large enough to prevent interference in the electromagnetic induction communication.

As an example, the communication exchange with the slave station at the branch point where the master station A exists will be described below. FIG. 6 is a timing chart showing the transmission timing of the transmission data of the master station and the slave station.

The inductive radio of the master station forms a communication area limited by a so-called loop coil antenna, and FIG.
The transmission data is sent at the timing shown in (a). Since this transmission data may be about several bytes related to the frequency channel of the transmitter 4 of the master station, the transmission time is sufficiently shorter than 1 ms.

A visitor enters this communication area, and the slave station uses induction radio to transmit data ch. When 1 (channel 1) is received, the receiver 24 is activated by the control of the MCU 25 in the slave station (see FIG. 6C), and at the same time, the PLL frequency synthesizer (PLL 24-1,
LPF 24-2 and VCO 24-3), and the reception frequency channel is set to ch. It is set to 1 and the reception standby state is set. After that, a message is transmitted from the transmitter 4 on the master station side at the timing of FIG. 6B, and the current supply to the receiver 24 is terminated at an appropriate timing when the message is terminated (see FIG. 6C). The timing for ending the current supply is controlled by the above-mentioned timer control or the reception of the message end signal from the master station.

After this, the processing of the slave station is roughly divided into two cases. If the visitor can select the route only with this message, the processing with the master station ends, and if the frequency channel data received by the guiding radio is the same as the previously received channel, reception is awaited. Performs processing that does not result in a state. This setting makes the MCU 25 the receiver 24 when the same frequency channel data is received from the master station.
It suffices to set not to output the signal for activating, and it can be realized by simple software using MCU and memory. Further, it is possible to realize a setting that the message once heard is not heard again as described above and is then heard again by a simple software using the MCU and the memory. Then, desired data may be set, and data for prompting the parent station to send the message again may be transmitted by induction wireless.

When the visitor needs more detailed data, as shown in FIG. 6D, the desired channel c is obtained by using the input means (for example, key input) of the slave station.
h. Select 3. At this time, the first message or the like is used to inform the visitor which frequency channel corresponds to the desired message. Then, as shown in FIG. 6D, this frequency channel ch. The data of No. 3 is transmitted to the master station, and by the same process as described above, the data of the ch. The message is transmitted in 3 (see FIG. 6E), and the slave station ends the process.

FIG. 7 is a timing chart showing another transmission timing of the transmission data of the master station. At the transmission timing of FIG. 6, ch. Since the communication between the slave station that received the setting data and the master station starts,
ch. When the setting data is received, it is possible to communicate with a plurality of slave stations and one master station, and the slave stations do not receive the message from the middle.

However, if a person behind the person enters the electromagnetic induction communication area while the previous message is flowing, ch. Since the transmission of the setting data has not started yet, the message from the master station cannot be heard, or the former person has to wait until the message is heard.

This is related to the length of the message, the frequency of visitors, etc., but a method of reducing the possibility of such a thing is to transmit the transmission data from the master station at the timing of FIG.

As shown in FIG. 7A, a ch. The setting signals of 1 to 3 are alternately and continuously transmitted. At this time, in the master station, ch. 1
The transmission messages corresponding to 3 to 3 can be simultaneously transmitted. For example, if you have multiple radio wave transmitters,
It is possible to adopt a configuration in which signals are multiplexed and transmitted.

The transmission messages corresponding to the respective channels are the same, and these messages are transmitted as shown in FIG.
As shown in (d) to (d), it is performed immediately after the transmission of each channel setting signal in FIG. 7 (a). For example, ch. 1
From immediately after the timing A1 when the setting signal of
h. Data transmission by 1 starts (timing B
1), the next ch. The transmission of the transmission message is completed by the time (timing B2) before the timing (timing A2) at which the 1 setting signal is transmitted.

Ch. 2 and ch. The same applies to the case of 3.
ch. 2 after the setting signal is transmitted, the next ch. 2 until the setting signal is transmitted. 2 to send a message, ch. Ch. Between 3 setting signals. 3. Send a message according to 3.

By doing so, the time until the start of the next message is shortened and the frequencies used are different, so there is no possibility of interference.

[0060]

As described above, the radio wave type receiver is turned on and waits for reception only when the message can be completely received from the beginning by the communication of the electromagnetic induction system. You will not hear from the middle.

Further, the radio wave receiver having large power consumption is configured to be turned on only when receiving a message,
Since it is an electromagnetic induction type wireless device that consumes less power, it is possible to prevent the battery of the mobile terminal carried by the child station or the visitor from being exhausted because the power is always turned on.

Furthermore, since the user obtains the necessary information by using the frequency channels respectively assigned in advance, interference can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram showing a configuration of a master station according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a slave station according to an embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration example of a PLL frequency synthesizer.

FIG. 5 is a diagram showing an example in which the present invention is applied to an attraction system such as a maze in an amusement park.

FIG. 6 is a timing chart showing transmission timings of transmission data of a master station and a slave station.

FIG. 7 is a timing chart showing another example of transmission timing of transmission data of the master station.

[Explanation of symbols]

1 master station 2 slave station 3 and 6 electromagnetic induction type radio 4 radio wave type transmitter 5 input / output device 7 radio wave type receiver 8 input / output unit 9-1, 9-2, 11, 21 loop coil antenna 10-1, 10-2, 12, 22 Antenna 13, 23 Inductive radio 14 Transmitter 15 MPU 16 Upper personal computer 17 Voice synthesis IC 18, 27 Voice driver 24 Receiver 25 MCU 26 Power switch 28 Input device 29 Output device 30 Power supply 31 Own Excitation oscillator 32 Phase comparator 33 Low-pass filter 34 Variable frequency divider 35 Feedback path

Claims (13)

[Claims] 1. A communication system for transmitting a message to a person carrying a slave station by wireless communication means of a plurality of scattered master stations, wherein the master station is an electromagnetic induction for performing data communication with the slave station. System-based induction wireless communication means, and a radio communication method wireless communication means for transmitting a message to the slave station, the slave station, the induction wireless communication means by an electromagnetic induction system for performing data communication with the master station, , A radio communication means for receiving a message from the master station is provided, and when the person carrying the slave station comes within the communication range of the guided wireless communication means of the master station, the slave station A communication system characterized by first performing the data communication with the master station, and then performing message communication by a radio wave method according to the content of the data communication. 2. The slave station further comprises output means for outputting a message or a picture received by the radio communication means by radio wave as voice or image, and by receiving a predetermined signal from the master station by the induction radio communication means, The communication system according to claim 1, wherein the output operation of the message sent from the master station is performed by radio communication by radio waves. 3. The slave station normally stops a part or all of the power source of the wireless communication means by the radio wave system, or stops a part or all of the receiving operation of the wireless communication means,
3. The communication system according to claim 2, wherein the radio communication device of the radio wave system starts the receiving operation with the predetermined signal received by the radio communication device of the electromagnetic induction system. 4. The radio communication method of the radio wave system of the slave station is capable of multi-channel reception, and performs message communication using the frequency channel transmitted from the master station by the guide radio communication means. The communication system according to claim 2. 5. The communication system according to claim 1, wherein the induction wireless communication means of the electromagnetic induction system of the slave station is capable of bidirectional communication. 6. The slave station transmits information to the master station by means of inductive wireless communication means, and in response to the information, the master station first notifies the slave station of a frequency channel for transmitting a message by means of electromagnetic induction communication, and then the radio wave. The communication system according to any one of claims 2 to 5, wherein a message is sent to a slave station using a frequency channel designated by the method. 7. The communication system according to claim 1, wherein the message is a voice message. 8. A slave station in a communication system for exchanging messages with a master station, which comprises an induction wireless means for performing data communication by an electromagnetic induction method and a transmitting means for transmitting a message by a radio wave method. A slave station in a communication system comprising: an inductive wireless means for performing data communication with the master station; and a receiving means for receiving a message from the master station by a radio wave method according to the content of the data communication. 9. The content of the data communication includes at least data regarding a frequency channel for transmitting a message from a master station and a command for activating a reception means of a slave station, and the reception means is activated at the timing of receiving the message. 9. The slave station of the communication system according to claim 8, wherein the receiving means is turned off when the reception of the message is completed. 10. The slave station of the communication system according to claim 8, wherein the message is a voice message. 11. A master station in a communication system for exchanging messages with a slave station, which comprises an induction wireless means for performing data communication by an electromagnetic induction method and a receiving means for receiving a message by a radio wave method. A master station in a communication system comprising: an inductive wireless means for performing data communication with the slave station; and a transmitting means for transmitting a message to the slave station by a radio wave method according to the content of the data communication. 12. The contents of the data communication include at least a frequency channel for transmitting a message from a master station and a command to activate a receiver of a slave station, and the receiver is activated at the timing of receiving the message, The master station of the communication system according to claim 11, wherein the receiving means is turned off when the reception of the message is completed. 13. The master station of a communication system according to claim 11, wherein the message is a voice message.