JPH0831809B2 - Simultaneous call wireless device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables interruption of a third station and selective switching of a communication partner by a master station during communication between two stations (master station and slave station) in a simultaneous call wireless device using a single frequency band. The present invention relates to a simultaneous call wireless device, which is useful for a wireless network of three or more stations.

[0002]

2. Description of the Related Art In recent years, various small-sized and high-performance wireless devices (generally called transceivers) have come on the market, and are rapidly spreading to amateur wireless and car wireless. Is well known.

There are generally two types of call systems for the above-mentioned wireless devices. One-way call switching system (so-called press talk system) in which the other party cannot talk until the other party has finished talking.
There is a simultaneous call system using a dual frequency band system having a transmission-only frequency band and a reception-only frequency band, and it is already commercially available.

The above-mentioned simultaneous call system has the same convenience as that of a mobile phone, but it has a problem that it occupies two frequency bands and cannot set the two frequency bands close to each other due to interference. Had.

Further, since the transmission frequency band and the reception frequency band must be determined in advance by the two wireless devices alternately, communication between specific two parties is possible and communication with other wireless devices is not possible. That was a lack of practicality.

Therefore, a simultaneous call wireless device has been developed which solves the above-mentioned drawbacks and enables simultaneous calls in a single frequency band by computer-controlled ultra-high speed transmission / reception switching and special voice processing.

The outline of the basic principle of the above-mentioned simultaneous call wireless device is outlined in Japanese Patent Application No. 224323 in 1984 by the applicant of the present invention.
And Japanese Patent Application No. 129273 of 1993.

The principle of transmission / reception with a single frequency in the above-mentioned simultaneous call wireless device will be outlined below with reference to FIGS. 6 to 9.

First, as shown in FIG. 6, this simultaneous call radio apparatus uses the same radios M and S having the circuit of FIG. 7 in combination. When the radio M first starts transmission, the radio M is the master station and radio S is the slave station.

First, the master station radio M will be described.

FIG. 8 is a block diagram of the wireless device M which is the main station.
3 is a time chart showing the characteristics of the audio signal at each point G1 to G9.

The transmitted sound G1 from the microphone 2 amplified by the low frequency amplifier 1 is input to the terminals 3a and 4a of the switches 3 and 4, and the changeover switch 5 is sampled to the terminal 3a only during the sampling period TA. The change-over switch 6 is controlled by the control lines 8 and 9 from the microcomputer 7 so that the change-over switch 6 is turned on to the terminal 4a only during the period TB.

Therefore, during the sampling period TA, the divided transmission sound L1 shown by G2 in FIG. 8 is transferred to the waveform storage element 10 via the switch 3, and then during the sampling period TB in FIG.
The divided transmission sound L2 indicated by G3 is input to the waveform storage element 11 via the switch 4.

The divided transmitted sound L1 stored in the waveform storage element 10 is output as the compressed transmitted sound S1 having a compressed waveform shown in G4 of FIG. 8 in the next sampling interval TB, and stored in the waveform storage element 11. The divided divided transmission sound L2 is output as the compressed transmission sound S2 shown by G5 in FIG. 8 in the next sampling section TA. The above is the delay control means, and the control of the waveform storage elements 10 and 11 is controlled by the clock pulse 13 of the flip-flop 12 operated by the control line 41 from the microcomputer 7.

The compressed speech sounds S1 and S2 are microcomputer 7
Is input to the mixer 28 by the changeover switches 24 and 25 of the changeover devices 20 and 21 which are appropriately controlled at the transmission / reception timings by the control lines 22 and 23 (when transmitting, the changeover switches are the transmission side terminals 20a and 21a). On the side), resulting in a synthesized compressed speech sound C (= S1 + S2), and after (or before) the compressed speech sounds S1 and S2 of each sampling section TA, TB under the control of the control line 27 from the microcomputer 7. By adding the sync signal X generated by the sync signal generator 26 shown in G6 of FIG.
The synthesized compressed transmission sound D (= C + X) shown in FIG.
It is output from 8.

A transmitting terminal 29 is controlled by a control line 30 from the microcomputer 7 during transmission.
It is an antenna switch in which the changeover switch 31 is turned on to a, and the above-mentioned synthetic compressed transmission sound D outputted from the mixer 28 is inputted via the transmitter 32 controlled by the control line 42 from the microcomputer 7. As a result, from the antenna 33 (antenna 33M of the radio M) to the slave radio S
Is transmitted to the antenna.

On the other hand, in the slave station radio S, the selector switch 31 of the antenna selector 29 is in the standby state and the receiving side terminal 2
9b and the antenna 33S receives it, the microcomputer 7
Is input to the receiver 34 controlled by the control line 43, and the synthesized compressed transmission sound D from the master station radio M is received and the polarity is inverted and output. Hereinafter, this will be referred to as a synthesized compressed reception sound D '(G in FIG. 7) in the slave radio S.
8 ').

Next, the synthesized compressed reception sound D'is converted into a sync signal detector 35 composed of a low-pass filter and a comparator.
Input to the high-pass filter 44 and the sync signal X '.
And the synthesized compressed reception sound G8 are separated and output.

The detected synchronizing signal X'determines sampling intervals Ta and Tb in which the slave station radio S and the master station radio M coincide in transmission and reception timing.

That is, when the synchronizing signal X'is input to the microcomputer 7 through the control line 36,
In the sampling section Tb, the microcomputer 7 inserts the selector switch 5 of the selector 3 into the terminal 3a, the selector switch 6 of the selector 4 into the terminal 4b, and the sampling switch Ta of the selector 3 into the terminal 3b in the sampling section Ta. , The changeover switch 6 of the changeover device 4 is controlled via the control lines 8 and 9 so that the changeover switch 6 is turned on to the terminal 4a.

Then, G1 of FIG. 7 in the slave radio S
~ G5, G7 ~ G9 As shown in the time chart of Fig. 9 showing the waveform of each point and X ', input to the waveform storage element 10 via the switch 3 as shown in G2 of Fig. 9 during the sampling period Ta. The compressed received sound S1 'becomes the reproduced received sound L1' which is expanded and reproduced in the next sampling section Tb, and is sent to the waveform storage element 11 via the switch 4 at the sampling section Tb as shown by G3 in FIG. The input compressed reception sound S2 'becomes the reproduction reception sound L2' which is expanded and reproduced in the next sampling section Ta.

Next, the changeover device 2 controlled by the control lines 22 and 23 from the microcomputer 7 so that the changeover switches 24 and 25 are respectively inserted into the reception side terminals 20b and 21b.
The received reception sound L to the mixer 38 on the receiving side via 0, 21.
By inputting 1'and L2 ', the continuous reproduced received sound (L1' + L2 ') shown in G9 of FIG. 9 is output,
After being amplified by the low frequency amplifier 39, it is input to the receiver 40, so that the slave radio S can listen to the call from the master radio M.

By the way, as described above, the slave station radio S has already detected the synchronization signal X by first receiving the compressed transmission sound from the master station radio M, and the subsequent transmission / reception between the master station and the slave stations. Since the timings are synchronized, the slave station radio S transmits to the master station radio M using the means at the time of transmission of the master station radio M, and the microcomputer 7 similarly controls them. There is. (The split transmission sound and the compressed transmission sound on the slave side are represented as L3, L4, S3, and S4 in the figure.) In this respect, the generation and mixing of the synchronization signal is not necessary on the slave side in principle. However, in practice, the subordinate side also goes. This is because it is possible to adjust the synchronization on both the master station side and the slave station side if the synchronization is lost. Normally, the master station side ignores the sync signal from the slave station side.

As described above, the master station radio M and the slave station radio S are synchronized, and transmission / reception is alternately switched at a timing of 100 ms or less to enable a simultaneous call in a single frequency band.

The waveform storage elements 10 and 11 have a sampling period T, as can be seen from G2 and G4 in FIG.
At A, at the same time when L1 is input and stored, the compressed reception sound S3 ′ from the partner station that was previously stored is expanded while the reproduction reception sound L3 ′ is output. It is done by doing. As this waveform storage element, for example, a charge transfer element BBD (bu
Ccket brigade device) is used.

[0026]

However, in the above-mentioned conventional simultaneous call radio apparatus using the single frequency band, only the communication between the master station and the slave station which first started communication is possible. Therefore, the simultaneous call wireless devices of the third station other than the master station and the slave station could not interrupt during the communication between the master station and the slave station.

That is, in the conventional simultaneous call wireless device, the time division of transmission / reception in each sampling section of the first sampling section and the second sampling section is divided into two (the transmission time zone of the compressed transmission voice and the other party). There is no means to make the master station or slave station recognize the existence of the third station that wants to communicate because it is done in the compressed reception tone of the station).

Therefore, the simultaneous call wireless device (station)
In the case of a wireless network with a large number of stations, once communication between two stations begins, other stations will be in a state of being unavailable during the communication, and there is a problem that wireless communication in an emergency becomes impossible. It was

The above inconvenience is similar to the case where the telephone is "busy" and the line is not connected, but in this case it is well known how convenient it is to have a call waiting device.

The present invention has been made in view of the above circumstances, and the transmission / reception time division in each sampling section is performed by setting the compression rate of the transmission sound of each radio station to 2.4 times or more and less than 8 times. It is divided into three parts, and in addition to the normal transmission time zone and reception time zone, an interrupt reception time zone for receiving the interrupt signal of the third station is provided to enable detection of the interrupt signal, and that the main station side has an interrupt The present invention provides a simultaneous call wireless device that enables a subsequent communication partner station to be selected by transmitting a control signal at the stage of detecting.

[0031]

In order to achieve the above-mentioned object, the present invention comprises a pair of radios having the same control means in which a transmission start side is a master station and a reception side is a slave station, and is a master station. Occasionally, a synchronization signal is generated to alternately and repeatedly set a first sampling period and a second sampling period, and a timing of transmission and reception by detecting the synchronization signal on the master station side when becoming a slave station. Sync signal detecting means for alternately and repeatedly setting the first sampling section and the second sampling section, and the first divided transmission sound divided and sampled in the first sampling section are stored and In addition to compression output in the second sampling section, the second divided transmission sound sampled in the second sampling section is stored to store the next first sampling section. The delay operation of compressing and outputting, and the compressed reception sound sampled in the first sampling section are stored and expanded and reproduced in the next second sampling section, and the compressed reception sound sampled in the second sampling section is stored. And a delay control means for performing a delaying operation for expanding and reproducing in the next first sampling section, and a signal combining for combining the compressed and output compressed voice-transmitted sound and the expanded reproduced voice-received sound. In the simultaneous call wireless device with a single frequency band, the compression rate of the compressed transmission sound is set to be 2.4 times or more and less than 8 times, and the first sampling section and the second sampling section are set. An interrupt receiving time zone for receiving an interrupt signal from a third station having the same control means other than the master station and the slave station is provided in the sampling section, and the interrupt signal is received. And the main stations,
Provided is a simultaneous call wireless device comprising: a control signal generation circuit that generates a control signal for switching communication between a slave station and a third station; and a control signal reception circuit that receives the interrupt signal and the control signal. To do.

[0032]

In the simultaneous call radio apparatus of the present invention, since the compression rate of the compressed transmission sound is set to be 2.4 times or more and less than 8 times, each of the first sampling section and the second sampling section. In the section, an interruption reception time zone for receiving an interruption signal from the third station can be provided separately from the transmission time zone of the compressed transmission sound and the reception time zone of the compressed reception sound from the partner station.

Further, the control signal generating circuit in the simultaneous call radio apparatus, which itself is the third station, generates the above-mentioned interrupt signal, and synchronizes with the synchronization signal of the main station to match the interrupt reception time zone of the main station. Send an interrupt signal.

At this time, if information such as the station number and the degree of urgency is added to the interrupt signal, the above information can be known as well as the detection of the interrupt from another station.

Next, when the master station receives the interrupt signal, it determines the subsequent communication switching among the master station, the slave station and the third station.

That is, when communicating between the master station and the third station, a control signal for canceling communication is transmitted to the current slave station, and the slave station immediately stops transmission. The third station subsequently communicates with the master station as a new slave station.

On the other hand, when the third station communicates with the slave station on behalf of the master station, the master station immediately transmits a control signal for alternation to the third station and immediately stops the transmission. Becomes the master station and starts communicating with the slave stations.

The control signal is generated by the control signal generation circuit of the main station, and is replaced with a part of the compressed transmission sound at the time of transmission of the main station and transmitted.

In the slave station and the third station, the control signal is received and demodulated by the control signal receiving circuit, and the control information is decoded by the microcomputer.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A simultaneous call radio apparatus according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same components as in the prior art are represented by the same reference numerals in the drawings.

FIG. 1 is a circuit diagram showing a main part of a simultaneous call radio apparatus including a control signal generating circuit and a control signal receiving circuit according to the present invention.

In FIG. 1, IC1 and IC2 are waveform storage elements (for example, BBD), and the above-mentioned 10, 11 of FIG.
The main station side stores the first divided transmission sound and the second divided transmission sound sampled in the first sampling section TA and the second sampling section TB and stores them in the next sampling section TB. , TA for compression output and a delay operation for expanding and reproducing the compressed reception sound sampled in the sampling intervals TB, TA in the next sampling intervals TA, TB.

Also on the slave station side, the IC1 and IC2 store the first divided transmission sound and the second divided transmission sound sampled in the first sampling section Ta and the second sampling section Tb, respectively, in the same manner as described above, and store them next. Sampling intervals Tb, T of
The delay operation of compressing and outputting at a, the sampling period Tb,
A delay operation of expanding and reproducing the compressed reception sound sampled at Ta in the next sampling sections Ta and Tb is performed.

The control for converting the divided transmission sound into the compressed transmission sound is two types of clock pulse C input to IC1 and IC2.
This can be easily done by setting the clock timing ratio of P1 and CP2 equal to the required compression rate.

Further, the IC 3 is the switching device 3 of FIG.
An integrated circuit element for performing divided sampling of 4, 20, and 21 and waveform synthesis, in which a transmission sound G1 is input, divided in each sampling section, and outputs (L1, L2) are output to the waveform storage elements IC1 and IC2, respectively. The waveform storage elements IC1 and I
The compressed transmission sound (S1, S2) compressed and output at C2 is input to be a synthetic compressed transmission sound C.

At the same time, the IC 3 receives the compressed and synthesized reception sound G
8 is input, divided at each sampling interval and output (S
3 ', S4') to the waveform storage elements IC1, IC2, respectively, and the reproduced reception sounds (L3 ', L4') expanded and reproduced by the waveform storage elements IC1, IC2 are input and synthesized to reproduce reproduction reception sounds. G9.

IC4 is an integrated circuit element for inserting a synchronizing signal / connecting voltage, and includes a synchronizing signal X (synchronizing signal voltage Vx),
The connecting voltage Vk is inserted into the synthesized compressed speech sound C for a predetermined time, and finally the synthesized compressed speech sound D is output.

The connecting voltage Vk is the start time of the transmission time zone of the synthetic compressed transmission sound D and the synchronization signal X.
A low level constant voltage inserted immediately before, to prevent a detection time error in sync signal detection and to prevent the reproduced voice from overlapping the unstable demodulated sound level. Is.

At this time, when the master station radio M receives the interrupt signal J from the third station, which will be described later, in the control signal receiving circuit 51, does the main station and the third station perform subsequent communication? , Or in order to transmit a control signal W to the slave station and the third station by the correspondent of the master station, in addition to inserting the synchronizing signal X and the connecting voltage Vk into the IC4, The control signal W generated by the control signal generation circuit 50 is inserted.

This control signal W is a frequency shift of a carrier sine wave in accordance with transmission information (control information for stopping communication with a slave station or changing master station with a third station is represented by a predetermined 0/1 digital signal). Modulation
Cy-shift keying (FSK).

The above-mentioned FSK is a kind of digital modulation and regardless of the kind of system, for example, MSK (Minimum Shift Keyin) which is a kind of narrow band FSK system.
g) method.

FIG. 2 is a time chart showing an example of the control signal W obtained by the MSK modulation.

This MSK system is a kind of narrow band FSK system, and as the name implies, it minimizes the frequency deviation ΔF. The frequency shifts discretely by ΔF, but the phase shifts continuously. After T seconds, the phase advances by 90 ° when sending “1” data, and the phase shifts when sending “0” data. Is delayed by 90 degrees.

As a result, if a phase at a time that is an integer multiple of T is taken out, demodulation can be performed as PSK, so that the code error rate becomes approximately the same as that of two-phase PSK.

Further, since the control information of the present simultaneous call radio apparatus is extremely small and simple, it is not necessary to minimize the frequency deviation ΔF. For example, as shown in FIG. 3, the section of "1" of the control information is an integral multiple of one wavelength of the carrier sine wave, and the section of "0" is 1.
A method of replacing with an integral multiple of 5 wavelengths may be used. In this case 2
The frequency ratio of the two modulated carrier sine waves is 1: 1.5 (the phase shift is continuous).

The combination of the logical patterns A and B as shown in the time chart of FIG. 4 which is input to the IC 4 from the microcomputer 7 through the control line,
The connection voltage Vk, the synchronizing signal voltage Vx, the control signal W, and the synthesized compressed speech sound C are taken in for each sampling section, and the final synthesized compressed speech sound D is synthesized.

That is, the connection voltage Vk is output when (A, B) is (1, 1), and the synchronization signal X (voltage Vx) is output at (1, 0).
Is output, the control signal W is output at (0, 1), and the synthetic compressed speech sound C is output at (0, 0).
Thus, the synthetic compressed transmission sound D including the control signal W is generated.

In addition, as a reminder, the control signal W is generated by the control signal generation circuit 50 via the control line 49 and taken into the synthesized compressed transmission sound D by the control signal reception circuit 51. When receiving the interrupt signal J and selecting the communication partner station, that is, only for the time when the control signal W is transmitted (about 0.1 to 1 second), the control signal W is not generated during normal communication. Moreover, the logical pattern (A, B) never becomes (0, 1).

However, during the time when the communication partner station is selected, the part where the synthesized compressed transmission sound C is normally output is partially replaced by the control signal W, so that on the partner station side (the slave station and the third station). Although the reproduced reception sound is not normally reproduced, there is no problem because it is not necessary to transmit voice when selecting the partner station.

It is needless to say that the microcomputer 7 can easily generate the logical patterns A and B by the program memory, and the insertion time width of each signal can be freely set.

It is needless to say that each of the main station, the slave station, and the microcomputer 7 of the third station appropriately controls the subsequent operation of the device in accordance with the control signal W transmitted or received.

For example, when the master station and the third station newly communicate with each other, the microcomputer 7 of the third station, as a slave station, performs each control in synchronization with the synchronization signal of the master station. On the other hand, the original slave station controls the operation of the device so as to shift to the communication stop state or the standby state so as to leave communication.

Next, the control signal receiving circuit 51 is connected to the high-pass filter 44, and detects the interrupt signal J from the third station and demodulates the control signal W from the main station, which is included in the synthetic compressed reception sound G8. To do.

The demodulated (returned to 0/1 digital signal) control information is input to the microcomputer 7.

At this time, although the interrupt signal J is included in the synthesized compressed reception sound G8 input to the IC3, the time period during which the interrupt signal J is expanded and reproduced at the time of division in each sampling interval is the control signal. Shall be ignored.

When it is desired to interrupt the master station or slave station in communication at the third station, a predetermined key operation is performed to synchronize with the master station's sync signal X and to match the master station's interrupt reception time zone. Send J.

The interrupt signal J is generated by the control signal generating circuit 50 via the control line 49 from the microcomputer 7, but it may be a sine wave,
The control signal W may be frequency shift keyed.

In the former case, only the presence of the third station desiring to interrupt the communication is detected. In the latter case, however, information such as a predetermined station number and urgency can be added to the interrupt signal J. It is convenient to know the above information, not just the presence of an interrupt from the third station.

FIG. 5 is a time chart showing the waveform of each time-divided sampling section when the master station, the slave station and the third station in communication transmit the interrupt signal J. The symbols G1 to G9, L1 to L4, S1 to S4, etc. correspond to the conventional examples of FIGS.

In the figure, by setting the compression rate from the divided transmission sounds L1 and L2 of the main station to the compression transmission sounds S1 and S2 to about 4 times, the sampling intervals TA and TB are the transmission time zone and the reception time. The time zone and the interrupt reception time zone Tw are divided into about three equal parts.

The compression rate can be freely set as long as it exceeds 2 times, and the width of the interrupt reception time zone TW can be freely set according to the compression rate, but the interrupt signal J is surely detected. Therefore, it is necessary to secure a sufficient width of TW, while the compression rate should be suppressed in order to operate compression / expansion reproduction without error.

Therefore, in practice, it is desirable to set it to 3 to 4 times, and the scope of claims of the present invention is 2.4 times or more,
The range of the compression rate of less than 8 times is based on the above circumstances.

[0073]

Since the transmission signal synthesizing circuit of the simultaneous call radio apparatus according to the present invention is configured as described above, it has the excellent effects described below.

(1) It has an excellent effect that the third station other than the main station and the slave station in communication can interrupt the communication between the master station and the slave station by transmitting the interrupt signal.

(2) The main station during communication has an excellent effect that, in case of interruption, it can freely select a subsequent communication station by transmitting a control signal.

(3) It has an excellent effect that it is easy to construct a wireless network of three or more stations because emergency communication is possible.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a main part of a simultaneous call wireless device including a control signal generation circuit and a control signal reception circuit according to the present invention.

FIG. 2 is a time chart showing an example of a control signal W obtained by MSK modulation.

FIG. 3 is a time chart showing an example of a control signal W by frequency shift keying of another method.

FIG. 4 is a time chart of logic patterns A and B for synthesizing a final synthesized compressed speech sound D, a synthesized compressed speech sound C, and a control signal W.

FIG. 5 is a time chart showing the main waveform of each time-divided sampling section when a master station, a slave station, and a third station in communication transmit an interrupt signal J.

FIG. 6 shows a master station wireless device M and a slave station wireless device S of a simultaneous call wireless device.

FIG. 7 is a circuit diagram of a conventional simultaneous call wireless device.

FIG. 8 shows G1 to G9 of FIG. 7 in the conventional master station radio M.
It is a time chart of the signal of each point.

FIG. 9 is a view showing G1 to G of FIG. 7 in the conventional slave radio S;
5 is a time chart of points G7 to G9 and X '.

[Explanation of symbols]

 M master station radio S slave station radio 7 microcomputer 10 and 11 waveform storage element 12 flip-flop 26 synchronization signal generator 28 transmitter mixer 29 antenna selector 32 transmitter 34 receiver 38 receiver mixer 44 high-pass filter 45 low-pass Filter 46 Comparator 49 Control line 50 Control signal generation circuit 51 Control signal reception circuit IC1, IC2 Waveform storage element (BBD) IC3 Divided / synthesized integrated circuit element IC4 Synchronous signal / connecting voltage insertion integrated circuit element L1 to L4 Divided transmission Sound L1 'to L4' Reproduced reception sound S1 to S4 Compressed transmission sound S1 'to S4' Compressed reception sound R1 to R5 Resistance Vx Synchronous signal voltage Vk Connection voltage Vf Comparison voltage C Synthesized compression transmission sound (= S1 + S2) D Synthesis Compressed transmission sound (= C + X) X synchronization signal (main station side) X'detection same Signal (slave station side) W control signal J interrupt signal TW interruption reception time period

Claims (1)

[Claims] 1. A set of radios having the same control means in which a transmission start side is a master station and a reception side is a slave station, and when the master station becomes a master station, a synchronization signal is issued to generate a first sampling period and a second sampling period. Synchronous signal generating means for alternately and repeatedly setting sections, and when the slave station is set, the synchronizing signal on the master station side is detected and the transmission / reception timing is adjusted to alternate the first sampling section and the second sampling section. And a synchronization signal detection unit that is repeatedly set, stores the first divided transmission sound that is divided and sampled in the first sampling section, compresses and outputs it in the next second sampling section, and the second sampling A delay operation of storing a second divided transmission sound that is divided and sampled in a section and compressing and outputting in the next first sampling section; and the first sampling section. The compressed reception sound sampled during the interval is stored and expanded and reproduced in the next second sampling section, and the compressed reception sound sampled in the second sampling section is stored and expanded and reproduced in the next first sampling section. Delay control means for performing a delay operation, and a signal synthesizing means for synthesizing the compressed and output compressed transmission sound and synthesizing the decompressed and reproduced reproduction received sound. In the simultaneous call wireless device, the compression ratio of the compressed transmission sound is set to be 2.4 times or more and less than 8 times, and the same control other than the master station and the slave station is performed in the first sampling section and the second sampling section. An interrupt reception time zone for receiving an interrupt signal from a third station having a means, and a control for switching the communication between the interrupt signal and the master station, slave station, and third station. Simultaneous call radio device comprising a control signal generating circuit for generating a Lumpur signal, a control signal receiving circuit for receiving the interrupt signal and the control signal, further comprising: a.