JPH09187068A - Radio relay system, slave set and radio repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain communication by each group without needing troublesome operations and complicated configuration of a repeater and a slave set in the radio relay system in which plural groups uses one repeater. SOLUTION: A slave set sends a digital signal in response to a digital signal for each transmission before the tone signal and a speech signal, and a tone signal of a relay control section 9 in the repeater R is set automatically based on a digital signal extracted from a reception signal by a digital signal extract section 11. Thus, one repeater is used by plural groups by setting different tone and digital signals for the plural groups.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless relay in which a plurality of slave groups that are divided into a plurality of groups can communicate with each other by using one wireless relay device (hereinafter referred to as a repeater). It is about the system.

[0002]

2. Description of the Related Art Conventionally, wireless communication using a repeater has been actively performed for the purpose of extending the communication distance. Generally, a repeater includes a transmitter and a receiver, and is configured to perform a relay operation by remodulating and transmitting a signal detected by the receiver in the transmitter.

Such repeaters can be roughly classified into an open type which can be freely used by unspecified people and a closed type which can be used only by a specific group of people. In the case of the open type, since the relay operation is activated when the carrier is input, it can be used freely by an unspecified person if only the repeater reception frequency (uplink frequency) is known. Since all the relay signals are received by the slave set to the repeater transmission frequency (falling frequency), it is not possible to perform communication only within a specific group.

Therefore, in the case of a general closed type for performing communication only within a specific group, the relay operation is activated only when the received signal includes a predetermined tone signal below the voice signal band. Is configured to. In this case, the slave unit has a function of transmitting a predetermined tone signal and a tone squelch function. Then, the repeater detects a predetermined tone signal transmitted from the slave unit belonging to the group and activates the relay operation.

In this way, in the slave unit, only the call signal including the predetermined tone signal can be heard by the tone squelch function, so that the relay communication only within the group becomes possible.

Since it is difficult for the repeater to remodulate the tone signal for transmission from the tone signal in the voice signal band included in the received signal or less, the tone signal included in the signal received by the high-pass filter is difficult. Is temporarily cut, a newly generated tone signal is added, and modulation / transmission is performed. Further, since such a repeater is generally installed in a place such as a high place where direct operation is difficult, some repeaters have a remote control function for managing and setting the repeater. This remote control function is provided with a control-dedicated receiving circuit in addition to the relay, and only a specific manager transmits a DTMF signal or the like, and the remote-control function is provided via the control-dedicated receiving circuit. It is configured to change the frequency of the tone signal of the repeater.

[0007]

However, in the conventional radio relay system as described above, in order to perform communication for each group, repeaters having different tone signals must be installed by the number of groups. There is a problem that it must be. Alternatively, there is a problem in that each slave unit has a remote control function, and it is necessary to switch the tone signal of the repeater to the tone signal of the group to which it belongs each time it is transmitted, which is a troublesome operation.

In addition to the tone signal for activating the repeater, each slave unit has a function of transmitting / receiving a digital signal for identifying a group or identifying a communication partner and a DTMF signal, and a repeater for repeating the digital signal. However, a complicated configuration is required for each child device and the repeater, which causes a problem of cost increase.

Therefore, according to the present invention, in a wireless relay system in which a plurality of groups use a single repeater, communication for each group can be performed without requiring a troublesome operation and a complicated configuration of the repeater and the slave unit. The purpose of the present invention is to provide a wireless relay system that enables

[0010]

In order to solve the above-mentioned problems, in claim 1, a plurality of slave units each having a transmission / reception function and a tone squelch function and divided into a plurality of groups, In a wireless relay system including a wireless relay device having a relay function for relaying communication between each slave, in each slave, a group setting means for setting a different group identification code for each group and a group identification code A digital signal prefix means for prefixing and transmitting a corresponding digital signal to the call signal is provided, and the wireless relay device includes an extracting means for extracting the digital signal from the signal transmitted from the slave unit and the digital signal. The tone signal control means for setting the frequency of the tone signal according to the tone signal control means, and the frequency of the tone signal included in the signal transmitted from the slave unit to the tone signal control means. And a tone signal adding means for adding the set tone signal to the call signal transmitted from the handset and transmitting the same. ,
It is configured such that a plurality of groups can share one wireless relay device without interfering with signals of other groups.

According to another aspect of the present invention, the slave unit has a group setting means for setting a different group identification code for each group, and a digital signal front means for preliminarily transmitting a digital signal corresponding to the group identification code to a call signal. Is equipped with. The wireless relay device according to claim 3, wherein the extraction unit that extracts a digital signal from the signal transmitted from the slave unit, the tone signal control unit that sets the frequency of the tone signal according to the digital signal, and the transmission unit transmitted from the slave unit. Relay control means for activating the relay function when the frequency of the tone signal included in the signal matches the tone signal set by the tone signal control means, and a call signal transmitted from the slave unit with the set tone signal. And tone signal adding means for adding and transmitting.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a plurality of groups G1 and G.
It is a figure explaining the form which 2, G3, ... Gn ... uses one repeater R. A plurality of child devices S1-1, S1-2, S1-3, ... To the group G1 and a plurality of child devices Sn-1, Sn-2, Sn-3 ,. belong to.

In FIG. 2 for explaining the block configuration of each slave unit, the slave unit S is a slave unit transmitting section 1 for transmitting a voice signal from a microphone, a slave unit receiving section 2 for demodulating a received signal, and a received signal. Among them, a tone squelch section 3 for selectively passing only a signal including a predetermined tone signal, a tone signal setting means 4 for manually setting a tone signal for tone squelch, and a digital signal front-end means 5 are further provided. ing. The tone signal setting means 4 corresponds to the group setting means.

The digital signal front means 5 is a signal converting means 51 for converting the digital setting signal set by the tone signal setting means 4 into a digital signal, and an input for inputting the converted digital signal to the handset transmitter 1. And the control means 52. The operation of the signal converting means 51 will be described with reference to the flowchart of FIG. First, in step 11, referring to the conversion table as shown in Table 1,
The input digital setting signal is encoded using an error correction code such as a Hagel-Burger code or a Hamming code. Then, in step 12, the encoded digital setting signal is added to the synchronization signal and is output to the handset transmitter 1 in the input control means 52.

[0015]

[Table 1] The tone squelch unit 3 switches the frequency of the tone signal to a frequency corresponding to the digital setting signal set by the tone signal setting unit 4, a slave unit tone signal switching unit 3A.
And a slave unit comparison unit 3B that outputs a squelch control signal when the tone signal included in the received signal is compared with the set tone signal and coincides with the set tone signal. Output device 3C to be input to the transmitter
And a switch means 3D which allows the reception signal to pass when the squelch signal is input and there is a detection signal.

Upon reception, the reception signal that has passed through the switch means 3D is output from the speaker as an acoustic signal.

As shown in FIG. 3, the repeater R includes a receiver 6, a transmitter 7, a relay switch 8, a relay controller 9, a tone signal controller 10, and a digital signal extractor 11. The digital signal extraction section 11 extracts a digital signal from the received signal, and the tone signal control means 10 outputs a digital setting signal corresponding to the digital signal extracted by the digital signal extraction section 11. The processing in the tone signal control means 10 and the digital signal extraction section 11 will be described with reference to the flowchart of FIG. First, in step 13, the synchronizing signal is waited, and when the synchronizing signal is detected, in step 14, the decoding processing is performed and the digital setting signal is obtained by referring to Table 1. Step 13 corresponds to the digital signal extraction section 11, and step 14 corresponds to the tone signal control means 10.

The relay control section 9 includes a repeater tone signal switching means 9A for outputting a tone signal having a frequency corresponding to the digital setting signal, and a repeater tone signal switching means for changing the tone signal included in the received signal. The repeater comparison means 9B that outputs a relay control signal when they match with the tone signal output from 9A, and when the relay control signal is output and the detection signal is present, the communication state is determined and the relay switch 8 is turned on. Switch control means 9D to turn on
And a repeater output means 9C for inputting the tone signal to the transmitter 7.

The relay control section 9 corresponds to relay control means, the digital signal extraction section 11 corresponds to extraction means, and the repeater output means 9C corresponds to tone signal addition means.

In the wireless relay system including the plurality of slave units S having the above-mentioned configuration and one repeater R, the first group G1 has a dedicated frequency F1 for a tone signal and 8 corresponding to this tone signal. A bit digital value D1 is assigned, and a dedicated tone signal frequency Fn and a digital signal Dn corresponding to this tone signal are assigned to the nth group Gn.

Therefore, when the slave unit S1-1 belonging to the first group G1 communicates with another slave unit S1-2 in the same group via a repeater, the tone signal setting means 4 of the slave unit S1-1. Set the digital value D1 by operating the digital switch of. As a result, the tone signal of the tone squelch unit 3 is set to the frequency F1 and the digital signal pre-means 5 becomes ready to output the digital signal obtained by converting the digital value D1 and becomes ready for communication.

Here, when the PTT switch is pressed, first,
A digital signal obtained by converting the digital value D1 from the digital signal prefix means 5 is transmitted from the handset transmitter 1 through the signal conversion means 51 and the input control means 52. Subsequently, a tone signal is added to the voice signal input to the microphone by the handset output means 3C and the voice signal is transmitted from the handset transmitter 1. As shown in FIG. 8, when the PTT switch is pressed at time t1, a digital signal is sent out immediately, and when an audio signal is input to the microphone at time t2, a tone signal is added and sent out.

In the repeater R, when the digital signal extracting section 11 extracts the digital signal D1 from the received signal, the tone signal control means 10 extracts the digital signal.
The digital setting signal based on D1 is output, and the tone signal of the repeater tone signal switching means 9A is set to the frequency F1 corresponding to the digital setting signal. The tone signal included in the subsequently received voice signal is compared in the repeater comparison means 9B and if a match is found, a relay control signal is output, so the switch control means 9D causes the relay switch 8 to operate.
Is turned on and the power supply of the transmitter 7 is turned on. At the same time, in the repeater output means 9C, the tone signal newly generated in the repeater tone signal switching means 9A is added to the received signal and input to the transmitter 7 for transmission.

After the transmission is completed, when the signal from another group Gn is received in the repeater R, a tone signal Fn different from the above is set based on the digital value Dn assigned to this group Gn, and immediately after that. Relay the group.

In the other slave units S1-21 in the same group, the signal from the slave unit S1-1 in the same group is a signal to which the tone signal of the predetermined frequency F1 is added by the repeater R as described above. Therefore, the tone squelch unit 3 provided in the slave unit operates to output only the received signal including the matched tone signal from the speaker.

In such a state, another group G
2 of the slaves S2-1, S2-2, S2-3, ... Or other slaves of the group Gn Sn-1, Sn-2, Sn-3 ,. However, since the tone signals are different, those tone squelch portions do not operate, so that they are not output from the speaker.

The operation flowchart of the slave unit is as shown in FIG. In step 1, when switching to transmission, the process branches to process 1, and when switching to receiving, the process branches to process 2. In process 1, if transmission is started, reception is stopped and transmission is started. Then, the digital signal is first output, and then the tone signal is transmitted together with the voice signal input to the microphone.

In process 2, if transmission is being performed in step 2, the process branches to process 3, and if transmission is not in progress, the tone signal is set to the frequency set by the tone signal setting means 4 and the slave unit reception is performed. The tone signal of the detection signal output from the unit 2 is compared, and if they match, the switch means 3D is opened. When there is no detected signal and when the tone signals do not match, the switch means 3D is closed.

The operation flowchart of the repeater is as shown in FIG. In step 3, the reception unit 6 monitors the presence or absence of a signal from the slave unit, and when a detection signal is obtained, a process 4 is performed. In process 4, the digital value is obtained from the signal from the slave unit, the tone signal of the relay control unit 9 is set based on the digital value, and the relay operation is performed, and process 5 is performed. In process 5, the tone signals are compared every time a signal from the slave unit is received, and if they match, the relay switch 8 is turned on and relaying is performed. If the tone signals do not match, in process 6, the relay switch 8 is turned off and no relay is performed.

[0030]

According to the wireless relay system, the child device, and the wireless relay device of the present invention, one wireless relay device can be divided into a plurality of groups and can be inter-grouped by the digital value and the tone signal set for each group. Since it can be used without interference, a great cost saving effect can be obtained as compared with the conventional method in which a wireless relay device is installed for each group.

Further, since a digital signal for controlling the wireless relay device and a tone signal are sent every time transmission from the slave unit and the tone signal of the wireless relay device is set to the tone signal of its own group, communication of other groups is performed. It is possible to communicate comfortably within a group without hearing. Further, since the digital signal sent for each transmission is completed in an instant, the time loss can be ignored as compared with the control signal such as the DTMF signal.

Further, the wireless relay device does not need a conventional receiving section for remote control, the slave unit does not need a digital receiving function, and only one set is required on the repeater side of the wireless relay device. An excellent wireless relay system as described above can be realized at a minimum cost as both a wireless relay device and a slave unit. In this way, a plurality of groups can share one wireless relay device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a wireless relay system of the present invention.

FIG. 2 is a block configuration diagram of a child device according to the present invention.

FIG. 3 is a block configuration diagram of a repeater according to the present invention.

FIG. 4 is an operation flowchart of the slave.

FIG. 5 is an operation flowchart of the repeater.

FIG. 6 is an operation flowchart of the digital signal front-end means.

FIG. 7 is an operation flowchart of a digital signal extraction unit.

FIG. 8 is a timing chart of the child device.

[Explanation of symbols]

 G1, G2, G3, Gn Group S, S1-1, S1-2, S1-3, Sn-1, Sn-2, Sn-3 Slave unit R repeater 1 Slave unit transmitter 2 Slave receiver 3 Tone squelch unit 4 tone signal setting means (group setting means) 5 digital signal front-end means 6 reception section 7 transmission section 9 relay control section (relay control means) 10 tone signal control means 11 digital signal extraction section (extraction means) 9C repeater output means (Means for adding tone signals)

Claims (3)

[Claims] 1. A wireless relay comprising a plurality of slave groups each having a transmission / reception function and a tone squelch function and divided into a plurality of groups, and a wireless relay device having a relay function for relaying communication between the slaves. In the system, each cordless handset is provided with a group setting means for setting a different group identification code for each group, and a digital signal front-end means for prefixing and transmitting a digital signal corresponding to the group identification code to a call signal. The wireless relay device includes an extracting unit that extracts a digital signal from a signal transmitted from the slave unit, a tone signal control unit that sets the frequency of the tone signal according to the digital signal, and a signal transmitted from the slave unit. Relay control means for activating the relay function when the frequency of the tone signal included in the tone signal matches the tone signal set in the tone signal control means. By providing the tone signal adding means for adding the set tone signal to the call signal transmitted from the handset and transmitting the signal, a plurality of groups can operate one wireless relay device without interfering with the signals of other groups. A wireless relay system characterized by being configured to be shared. 2. A group setting means for setting a different group identification code for each group, and a digital signal prefix means for prefixing and transmitting a digital signal corresponding to the group identification code to a call signal. Claim 1 characterized by
Handset used in the wireless relay system of. 3. Extraction means for extracting a digital signal from a signal transmitted from a slave unit, tone signal control means for setting a frequency of a tone signal according to the digital signal, and a tone signal control means included in the signal transmitted from the slave unit. Relay control means for activating the relay function when the frequency of the tone signal to be generated matches the tone signal set in the tone signal control means,
The wireless relay device for use in the wireless relay system according to claim 1, further comprising: tone signal adding means for adding the set tone signal to the call signal transmitted from the slave unit and transmitting the tone signal.