JP2016213625A - Mobile radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile radio system that can flexibly comply with a communication condition in each country and can easily match a communication condition between a master unit and a slave unit at the site.SOLUTION: A mobile radio system has a main communication mode of performing transmission of speech or reception of speech, and an initial setting mode of matching, by radio communication, a condition to perform transmission or reception of speech between a master unit and a slave unit in the main communication mode. Frequency bands used for communication in the two modes are different from each other. By performing predetermined operation at the master unit or the slave unit, they can be shifted from the main communication mode to the initial setting mode any time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a portable wireless system, and more specifically, a portable wireless device that includes a parent device having a transmission function and a child device having a reception function, and performs a guidance broadcast for a user. About the system.

  There is a wireless guide system as a guide device for sightseeing guidance and theater commentary. This system uses a portable wireless system consisting of a master unit with a transmission function and a slave unit with a reception function. Taking tourist information as an example, a commentator such as a tourist guide is used as the master unit. The content spoken to the microphone provided is delivered to tourists through a receiving device such as an earphone attached to the handset. Such a wireless guide system can cover a wide area of about 50 to 60 m, and can be operated by switching a plurality of communication paths.

  In the operation of such a portable radio system, a frequency band of 806.50 to 809.75 MHz allocated for a specific low power radio microphone can be used in Japan. In order to avoid mutual communication interference, the frequency band is divided into 16 channels and used. Radio equipment using this frequency band is treated as a specified low-power radio station by receiving technical standard conformity certification (so-called “technical suit”) that the transmission output is within a predetermined range, even for users without licenses Wireless communication can be performed using this.

  By the way, when the operation is performed by dividing the frequency band assigned in advance into a plurality of channels as described above, it is natural that the channel set on the parent device on the transmission side and the reception side If the channel set for a certain handset does not match, transmission / reception cannot be performed. On the other hand, although the operation of matching the channel settings between the master unit and the slave unit is simple at first glance, it becomes quite complicated as the number of slave units increases. Although not related to the specific low-power radio microphone device, for example, in Patent Document 1, when the power is turned on, information on the frequency used for communication is transmitted from the transmitter side to the receiver side by weak radio waves, A model radio control system characterized by performing radio communication at the frequency has been proposed. However, in this system, matching of such communication conditions is performed only once when the power is turned on, and such matching is not performed at an arbitrary timing.

JP 2005-218552 A

  As described above, in Japan, users who do not have a license communicate wirelessly using a specific frequency band and equipment that has a predetermined transmission output or less by receiving technical skills. It is possible. This “specific frequency band” is different in each country, and if a device using the 806.50 to 809.75 MHz band allocated for a specific low-power radio microphone is used in Japan as it is, it may be illegal. is there. Therefore, when exporting the above-mentioned radio guide system overseas, it is necessary to prepare as many products as the number of countries to export that have the frequency band to be used in conformity with the standards of each country. And exporters must have a lot of inventory.

  In addition, when a plurality of tourist information providers use the wireless guide system as described above at a tourist attraction, etc., a channel set in advance may already be used by another business. All the slave units must be set to different channels. It is impossible to ask such an operation to an unfamiliar tourist, but it is also a waste of time to collect and re-set the handset distributed to the tourist. If you know in advance which channels are available, there is no such thing as it is not possible to know unless you go to the site, especially in places where many tourists gather, avoid the above problems It cannot be passed through.

  The present invention has been made in view of the above situation, can flexibly cope with the communication conditions in each country, and matches the communication conditions between the parent device and the child device in the field. It is an object of the present invention to provide a portable wireless system that can easily perform the above.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have established the communication mode for transmitting or receiving speech and the conditions for transmitting and receiving speech between the master unit and the slave unit. There are initial setting modes that are matched by wireless communication. In these two modes, the frequency bands used for communication are different from each other, and it is always possible to perform initial setting from this communication mode by performing a predetermined operation in the master unit or slave unit It has been found that all the above problems can be solved by making it possible to shift to the mode, and the present invention has been completed.

  The present invention is a portable wireless system for performing a guidance broadcast for a user, comprising a master unit having a transmission function and a slave unit having a reception function. , The main communication mode for transmitting or receiving speech, and the initial setting mode for matching the conditions for transmitting and receiving speech between the master unit and the slave unit, respectively, in these two modes, the frequency used for communication Are different from each other, and by performing a predetermined operation in the base unit in the communication mode, the base unit shifts to the initial setting mode in which a message can be transmitted at the first frequency, The initial setting message containing information on the second frequency used for transmission is repeatedly sent over a certain period of time or the period in which the above operation is continued, and then the mode shifts to the communication mode in which transmission is performed at the second frequency. This communication mode By performing a predetermined operation in the slave unit, the slave unit shifts to the initial setting mode in which a message can be received at the first frequency. The mobile wireless system is characterized in that a communication condition for receiving a call is set based on the initial setting message received from the mobile station, and then the communication mode is switched to the communication mode for receiving a call at the second frequency.

  The operation for shifting to the initial setting mode in the parent device and the child device is preferably a switch operation.

  It is preferable that transmission / reception of messages at the first frequency is performed by weak radio waves or at a frequency approved for use with a specific low-power radio station.

  It is preferable to provide an indicator for displaying whether the slave is in the initial setting mode or the main communication mode.

  According to the present invention, there is provided a portable radio system that can flexibly cope with communication conditions in each country and can easily perform matching of communication conditions between a parent device and a child device on site. Is done.

FIG. 1 is a simplified diagram showing state transitions in a base unit according to an embodiment of the present invention. FIG. 2 is a state transition diagram in the base unit according to the embodiment of the present invention. FIG. 3 is a simplified diagram showing state transition in the slave unit according to the embodiment of the present invention. FIG. 4 is a state transition diagram in the handset according to the embodiment of the present invention.

  Hereinafter, one embodiment of a portable wireless system of the present invention will be described in the order of a parent device and a child device.

[Base unit]
The base unit in the present embodiment is equipped with a transmission function for picking up the voice of the guider with a microphone, converting it into a digital signal and transmitting it to the slave unit in a portable radio system for performing a guide broadcast for the user. This master unit includes a main communication mode for transmitting a speech and an initial setting mode for matching conditions for transmitting and receiving a speech between the master and the slave. In these two modes, the frequencies used for communication are different from each other, and by performing a predetermined operation in the parent device in this communication mode, this parent device can send an initial message at the first frequency. The mode is shifted to the setting mode, and an initial setting message including information on the second frequency used for transmission is repeatedly transmitted over a predetermined time, and then the mode is shifted to the communication mode in which transmission is performed at the second frequency. Hereinafter, the master unit in the present embodiment will be described with reference to the drawings. FIG. 1 is a simplified diagram showing state transitions in a base unit according to an embodiment of the present invention. FIG. 2 is a state transition diagram in the base unit according to the embodiment of the present invention.

  First, the master unit of this embodiment will be described with reference to FIG. In addition, since the audio circuit, the high frequency circuit, and the like in this parent device are well known, the description thereof is omitted. The parent device in the present embodiment includes a main communication mode for transmitting a speech and an initial setting mode for matching conditions for transmitting and receiving a speech between the parent device and the slave. As already described, the frequency band permitted for this type of wireless communication varies from country to country, and even within each country, communication is performed by dividing the permitted frequency band into a plurality of channels. Therefore, when performing actual voice communication, the frequency used between the parent device and the child device must be matched in advance. In the initial setting mode, communication is performed between the master unit and the slave unit at a predetermined frequency to perform the matching in the initial setting mode. In the main communication mode, transmission / reception is actually performed.

  This communication mode in the base unit is a mode for transmitting a voice and has two states, a standby state and an operating state. The base unit includes a power switch made up of push buttons and function keys made up of push buttons. When the function key is pressed for 2 seconds in this communication mode, the mode shifts to the initial setting mode. Also, when the power switch is pressed for 50 milliseconds to 2 seconds in the stop state where the power is off, the power is turned on and the communication mode is shifted to the standby state, and when the power switch is pressed for 2 seconds in the communication mode or the initial setting mode. Stopped.

  The standby state is a mode in which, in order to suppress battery consumption, the high-frequency circuit is turned off, the sound circuit is turned on intermittently, and only the presence / absence of sound input from the microphone is checked intermittently. The operating state is a mode in which the high-frequency circuit and the audio circuit are turned on, and the audio input from the microphone is digitally converted and transmitted. The master unit in the present embodiment enters an operating state when it detects a voice input in the standby state, enters a standby state when it detects a silent state for a certain period of time (30 seconds) in the operating state, and operates for a long time (2 Time) When it is detected that there is no sound, it will stop.

  The initial setting mode is a mode in which a transition is made by pressing the function key for 2 seconds in this communication mode, and an initial setting message including information on the second frequency used for transmission at a predetermined first frequency. Is repeatedly sent for 30 seconds. Thereafter, the communication mode is entered.

  When the power switch and the function key are pressed simultaneously for 3 seconds in the stop state, the state shifts to the setting state. In the setting state, it is possible to set information about a country in which the portable wireless system is used and which channel is used for communication in a frequency band corresponding to the country. Based on the country information and channel information set here, the second frequency used for transmission is determined, and the contents are stored in the memory. In addition, when an audio signal is transmitted, an identification number is added so that communication can be performed only between the parent device and the child device having the same identification number, so that one channel can be further divided and used. In such a case, such an identification number may be set here and stored in the memory. When the power switch is pressed for 2 seconds in the setting state, the state shifts to the stop state.

  Next, each state will be described in detail with reference to FIG. The stop state is a state in which the power is off, and all the circuits are stopped. When the power switch is pressed for 50 milliseconds to 2 seconds in the stop state, the communication mode is set to the standby state. Even if the power switch is pressed for less than 50 milliseconds, the state does not change. This is to prevent the operation from changing even if the switch is touched carelessly. In the standby state, the power of the voice circuit is turned on to check whether there is a voice input. At this time, LED1 which is a power indicator is turned on. If there is no sound for 100 milliseconds or more, the sound circuit is turned off and the LED 1 is turned off. Then, after waiting for 900 milliseconds, the LED 1 is turned on, the power of the voice circuit is turned on, and the presence / absence of voice input is checked for 100 milliseconds as described above. By repeating this, the audio circuit operates intermittently and the LED 1 blinks. In this state, since it operates only for 100 milliseconds per second, battery consumption can be suppressed. In the standby state, the high-frequency circuit remains off. When a voice input is detected in this state, the operation state is entered.

  In the operating state, the sound circuit and the high-frequency circuit are turned on to turn on the LED 1. Then, the information about the second frequency stored in the memory is read, and the PLL circuit is set accordingly. Thereby, the digitized audio signal is transmitted at the second frequency. The output at this time is about 10 mW, for example. When the voice input is checked and a voice is detected, an APO (Auto Power Off) timer is reset. If there is no voice input for 30 seconds or more, a standby state is entered. In the operating state, the LED 1 is always lit to inform the user that it is in the operating state.

  In this communication mode, the APO timer is constantly monitored, and if the state where there is no voice input is continued for 2 hours or more, the APO timer is timed up and shifts to a stopped state. However, if there is a voice input, the APO timer is reset as described above. Therefore, the APO timer times out and shifts to the stopped state only when there is no voice input. In this communication mode, even if the power switch is pressed for 2 seconds, it can be shifted to the stopped state. Although not shown, the APO timer is also reset when the power switch is pressed for 50 milliseconds to 2 seconds in the sleep state to shift to the standby state of this communication mode.

  In this communication mode (standby state or operating state), pressing the function key for 2 seconds shifts to the initial setting mode. In the initial setting mode, the high-frequency circuit is turned on, the PLL circuit is set to a predetermined first frequency, and the LED 2 that is an indicator indicating the initial setting mode is turned on. Then, an initial setting message including CRC information for error detection in addition to information necessary for communication, such as information on the second frequency stored in the memory of the parent device and country information, is created. Transmit repeatedly at the first frequency over a second. By repeatedly transmitting in this way, the initial setting information can be reliably transmitted to all the slave units existing around the master unit.

  As the first frequency, for example, 802.05 MHz is used. This is preset at the time of shipment for both the parent device and the child device, and the same frequency is used both in Japan and abroad. Therefore, it is possible to reliably transfer the initial setting message from the parent device to the child device. This frequency is included in a frequency band allocated for a specific low power radio station (specific low power radio microphone) in Japan, and can be transmitted with an output of about 10 mW in Japan. On the other hand, in foreign countries, there is a possibility that this first frequency is not the frequency assigned for a specific low-power radio station in Japan. In that case, it is transmitted with a weak radio wave of about 0.1 mW that does not require a license. I do. That is, in Japan and foreign countries, the initial setting message is transmitted by changing only the output without changing the first frequency (802.05 MHz in the above example). As a result, the first frequency information can be preset in both the parent device and the child device as described above, and a special setting is performed in the initial setting mode between the two (manual input of the first frequency information). It is possible to send and receive an initial setting message without inputting frequency information. Note that different frequencies are selected for the second frequency used for voice communication in the communication mode and the first frequency used for transmission of the initial setting message in the initial setting mode.

  As described above, after the initial setting information is repeatedly transmitted at the first frequency for 30 seconds, the LED 2 is turned off, and a transition is made to the standby state of this communication mode. Thus, since the LED 2 is lit only when in the initial setting mode, the LED 2 can be used as an indicator for displaying whether it is in the initial setting mode or the present communication mode. In the initial setting mode, when the power switch is pressed for 2 seconds, it shifts to the stop state.

  In the stop state, the function key and the power switch are pressed for 3 seconds to shift to the setting state. In the setting state, the country information setting, the second frequency setting, and the like can be performed while the high-frequency circuit and the audio circuit are off. Various types of information set here are stored in the memory and read out as necessary. For example, the information about the second frequency used in the communication mode is stored in the memory set in the setting state, and is read out from the memory in the operation state of the communication mode as described above, and the PLL circuit Set to When the power switch is pressed for 2 seconds in the set state, the state shifts to the stop state.

[Cordless handset]
Next, the slave unit will be described. In this embodiment, the slave unit is a portable radio system for performing a guide broadcast for a user, and an audio signal transmitted from the master unit is converted into an analog signal by a voice circuit and reproduced by a playback device such as an earphone. It has a function. This handset includes a main communication mode for receiving a call and an initial setting mode for matching conditions for sending and receiving a call between the base unit and the handset. In these two modes, the frequencies used for communication are different from each other. By performing a predetermined operation in the slave unit in this communication mode, the slave unit can receive a message at the first frequency. Transition to the initial setting mode, set the communication conditions for receiving the call based on the initial setting message received from the parent machine at that time, and then receive the call at the second frequency set here Migrate to Here, the first frequency and the second frequency correspond to the first frequency and the second frequency described in the description of the master unit, respectively. Hereinafter, the slave in this embodiment will be described with reference to the drawings. FIG. 3 is a simplified diagram showing state transition in the slave unit according to the embodiment of the present invention. FIG. 4 is a state transition diagram in the handset according to the embodiment of the present invention.

  First, the slave of this embodiment will be described with reference to FIG. In addition, since the audio | voice circuit, high frequency circuit, etc. in this subunit | mobile_unit are well-known things, the description is abbreviate | omitted. The handset in this embodiment includes a main communication mode for receiving a call and an initial setting mode for matching conditions for sending and receiving a call between the base unit and the handset. The initial setting mode is provided in order to perform communication at a predetermined frequency between the parent device and the child device and to match the frequency in this communication (transmission / reception) in advance as described in the parent device. In this communication mode, transmission / reception is performed at a frequency matched in this mode.

  This communication mode in the handset is a mode for receiving a call and has two states, a standby state and an operating state. The slave unit includes a power switch composed of a push button and a function key composed of a push button. When the function key is pressed for 2 seconds in this communication mode, the mode shifts to the initial setting mode. Also, when the power switch is pressed for 50 milliseconds to 2 seconds in the stop state where the power is off, the power is turned on and the communication mode is shifted to the standby state, and when the power switch is pressed for 2 seconds in the communication mode or the initial setting mode. Stopped.

  The standby state is a mode in which, in order to suppress battery consumption, the sound circuit is turned off, the high-frequency circuit is turned on intermittently, and only the presence / absence of a carrier from the parent device is checked intermittently. The operation state is a mode in which the sound circuit and the high frequency circuit are turned on, the sound signal transmitted from the parent device is converted into an analog signal, and the sound is reproduced from a reproducing device such as an earphone. The slave unit according to the present embodiment is in an operation state when a carrier from the master unit is detected in the standby state, enters a standby state when the carrier from the master unit disappears in the operation state, and is in a standby state for a long time (2 hours). If the state without the continuation is continued, it becomes a stop state.

  The initial setting mode is a mode that shifts by pressing the function key for 2 seconds in this communication mode, and waits for reception of an initial setting message from the parent device at a predetermined first frequency. As described above, the initial setting message includes information on the second frequency used for transmission / reception, and the slave unit that has received the information stores the received second frequency information in the memory. To do. The second frequency information stored in the memory is set in the PLL circuit in the communication mode, and carrier detection and transmission / reception are performed at that frequency. After completing the reception of the initial setting message, or after 30 seconds have passed without completing the reception, the communication mode is entered.

  Next, each state will be described in detail with reference to FIG. The stop state is a state in which the power is off, and all the circuits are stopped. When the power switch is pressed for 50 milliseconds to 2 seconds in the stop state, the communication mode is set to the standby state. Even if the power switch is pressed for less than 50 milliseconds, the state does not change. This is to prevent the operation from changing even if the switch is touched carelessly. In the standby state, after the power of the high frequency circuit is turned on, information on the second frequency stored in the memory is read out, and the read second frequency is set in the PLL circuit to check the presence of the carrier. At this time, LED1 which is a power indicator is turned on. If there is no carrier for 100 milliseconds or more, the power of the high frequency circuit is turned off and the LED 1 is turned off. Then, after waiting for 900 milliseconds, the LED 1 is turned on, the power of the high-frequency circuit is turned on, and the presence / absence of the carrier is checked for 100 milliseconds as described above. By repeating this, the high frequency circuit operates intermittently and the LED 1 blinks. In this state, since it operates only for 100 milliseconds per second, battery consumption can be suppressed. In the standby state, the audio circuit remains off. And if a carrier is detected in this state, it will be in an operation state.

  In the operating state, the power of the high frequency circuit and the audio circuit is turned on to light the LED 1. Then, the audio information is received at the second frequency set in the PLL circuit, and the audio is output from a playback device such as an earphone. Reset the APO (Auto Power Off) timer and check the carrier. Repeat this if you have a career. In the operating state, the LED 1 is always lit to inform the user that it is in the operating state.

  If a state in which there is no carrier is detected in the operating state, the intermittent timer is reset, the LED is turned off, the sound circuit is turned off, and a standby state is entered. In the standby state, the carrier is continuously checked for the first 100 milliseconds, but thereafter the carrier is checked intermittently. This is to prevent the reception from being interrupted due to an instantaneous interruption of the carrier. Note that checking the carrier continuously for 100 milliseconds when shifting from the operating state to the standby state can be realized by checking the carrier until the count of the intermittent timer reset as described above reaches 100 milliseconds or more.

  In this communication mode, the APO timer is constantly monitored, and when the carrier-free state continues for 2 hours or more, the APO timer is timed up and shifts to a stopped state. However, since the APO timer is reset as described above if there is a carrier input, the APO timer is timed up and shifted to the stopped state only when there is no carrier. In this communication mode, even if the power switch is pressed for 2 seconds, it can be shifted to the stopped state. Although not shown, the APO timer is also reset when the power switch is pressed for 50 milliseconds to 2 seconds in the sleep state to shift to the standby state of this communication mode.

  In this communication mode (standby state or operating state), pressing the function key for 2 seconds shifts to the initial setting mode. In the initial setting mode, the high frequency circuit is turned on, the PLL circuit is set to a predetermined first frequency, and the LED 2 that is an indicator indicating that the initial setting mode is set is turned on. Thereby, it becomes possible to receive the initial setting message from the parent device at the first frequency. The initial setting message transmitted from the base unit includes CRC information for error detection in addition to information necessary for communication such as information on the second frequency and country information. The success or failure of receiving the setting message is determined. When the reception is successful, the received second frequency information is stored in the memory. As already described, the second frequency information stored in the memory is set in the PLL circuit in the communication mode, and carrier detection and transmission / reception are performed at that frequency. If reception fails, it will try to receive the initial setting message sent from the base unit again. After successfully receiving the initial setting message, or after 30 seconds have passed without receiving the initial setting message, the LED 2 is turned off, and the communication mode is shifted to the standby state. Thus, since the LED 2 is lit only when in the initial setting mode, the LED 2 can be used as an indicator for displaying whether it is in the initial setting mode or the present communication mode. In the initial setting mode, when the power switch is pressed for 2 seconds, it shifts to the stop state.

  As described in the description of the master unit, for example, 802.05 MHz is used as the first frequency. This frequency is the same as the first frequency set in the master unit. Thereby, it is possible to transmit and receive an initial setting message between the parent device and the child device without performing special setting in the initial setting mode (inputting first frequency information manually). Note that different frequencies are selected for the second frequency used for voice communication in the communication mode and the first frequency used for transmission of the initial setting message in the initial setting mode.

  As described above, the master unit and the slave unit in the present embodiment press the function key for 2 seconds while the power is turned on, that is, by performing a predetermined operation, at the first frequency, The parent device transmits an initial setting message, and the child device receives the initial setting message. Therefore, if the function key is pressed at the same timing between the parent device and the child device, the communication conditions are matched between the parent device and the child device located close to each other. As a result, the wireless guide system can be established by matching the communication conditions between the tourist guide and the tourist at any timing without causing interference with other users and without performing complicated operations. Can be used. In other words, for example, when there is a situation where interference with other users is expected suddenly during operation, another channel (frequency) is immediately set on both the master unit and the slave unit. To avoid interference. In addition, in foreign countries, the initial setting message from the parent device to the child device using the first frequency is transmitted with weak radio waves that do not require a license, and the second frequency is set in the frequency band permitted in that country. Since it can be set and used for transmission and reception, it is possible to flexibly cope with communication conditions in each country.

  Although one embodiment of the portable wireless system of the present invention has been described above, the present invention is not limited to the above embodiment, and may be implemented with appropriate modifications within the scope of the present invention. it can.

  For example, in the above embodiment, after performing a predetermined operation (function key pressing) in this communication mode, the initial setting message is transmitted and received by shifting to the initial setting mode for a predetermined time (30 seconds). However, the initial setting message may be transmitted and received by shifting to the initial setting mode only while a predetermined operation is performed. In this case, since the parent device continues to transmit the initial setting message until all the child devices have successfully received the initial setting message, communication conditions in the child device can be more reliably matched.

  In the above-described embodiment, the operation for shifting to the initial setting mode is the pressing of the push button. However, this may be any predetermined operation, such as a slide switch operation. .

  Further, in the above-described embodiment, for example, a time for continuing the operation to perform various operations such as a function key pressing time (2 seconds) for shifting to the initial setting mode is set. The time may be arbitrarily set. These settings may be set, for example, in a setting state in the parent device, and the setting may be transmitted to the child device by an initial setting message.

  In the above embodiment, 802.05 MHz is used as the first frequency. However, another frequency such as 807.05 MHz may be used, and an arbitrary frequency can be set after shipment. Good. Note that the first frequency may not be a frequency defined for a specific low-power radio station in Japan. In this case, it is necessary to use a weak radio wave that does not require a license to transmit the initial setting message at the first frequency, but all the frequency bands defined for the specific low-power radio station are used as the second frequency. be able to. In this case, communication at the first frequency is based on weak radio waves, but communication at the second frequency band can be performed with a normal level output.

  In the above embodiment, the LED 1 is used as a transmission / reception display in the present communication mode, and the LED 2 is used as an indication of the initial setting mode. In addition to this, the LED 3 that indicates that the power is on is used. May be. In this case, for example, a green LED is used as the LED 2 and a red LED is used as the LED 3 to form a two-element LED configuration including these LEDs as one package. It can be green in the mode, and it is possible to improve the visibility of information while saving space.

  In the above embodiment, communication for transmission / reception (that is, communication in this communication mode) is performed with a digital signal. However, this may be performed with an analog signal.

Claims (4)

A portable wireless system for performing a guidance broadcast for a user, comprising a parent device having a transmission function and a child device having a reception function,
The master unit and the slave unit each have a main communication mode in which transmission or reception is performed, and an initial setting mode in which conditions for performing transmission and reception between the master unit and the slave unit are matched. The two modes use different frequencies for communication,
By performing a predetermined operation on the parent device in the communication mode, the parent device shifts to the initial setting mode in which a message can be transmitted at the first frequency, and is used for transmission. An initial setting message including information on the second frequency is repeatedly sent over a certain period of time or a period of continuing the operation, and then the mode shifts to the communication mode in which transmission is performed at the second frequency,
By performing a predetermined operation in the slave unit in the communication mode, the slave unit shifts to the initial setting mode in which a message can be received at the first frequency. A portable wireless system, wherein a communication condition for receiving a call is set based on the initial setting message received from the base unit, and thereafter, a transition is made to the communication mode in which a call is received at the second frequency.   The portable wireless system according to claim 1, wherein an operation for shifting to the initial setting mode in the parent device and the child device is a switch operation.   The portable radio system according to claim 1 or 2, wherein transmission / reception of a message at the first frequency is performed by a weak radio wave or a frequency approved for a specific low power radio station.   The portable wireless system according to any one of claims 1 to 3, further comprising an indicator for displaying whether the slave unit is in the initial setting mode or the main communication mode.

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