KR100845098B1 - Multilateral digital wireless communication system - Google Patents

Multilateral digital wireless communication system Download PDF

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Publication number
KR100845098B1
KR100845098B1 KR1020070035386A KR20070035386A KR100845098B1 KR 100845098 B1 KR100845098 B1 KR 100845098B1 KR 1020070035386 A KR1020070035386 A KR 1020070035386A KR 20070035386 A KR20070035386 A KR 20070035386A KR 100845098 B1 KR100845098 B1 KR 100845098B1
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South Korea
Prior art keywords
communication device
voice signal
main communication
voice
sub
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KR1020070035386A
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Korean (ko)
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성 운 한
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성 운 한
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
    • H04L12/1822—Conducting the conference, e.g. admission, detection, selection or grouping of participants, correlating users to one or more conference sessions, prioritising transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1859—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast adapted to provide push services, e.g. data channels

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Transceivers (AREA)

Abstract

The present invention provides an antenna for transmitting and receiving digital signals, an RF input and output unit for modulating or demodulating a digital signal transmitted and received through the antenna, a voice input unit for inputting a voice signal, a voice codec for converting a digital voice signal and an analog voice signal, and an analog signal. A main communication device including a voice output unit for outputting a voice signal to the outside and a CPU for controlling the respective elements; An antenna for transmitting and receiving digital signals to and from the main communication device, an RF input / output unit for modulating or demodulating digital signals transmitted and received through the antenna, a voice input unit for inputting a voice signal, a voice codec for converting a digital voice signal and an analog voice signal to and from each other, And a plurality of sub communication devices including a voice output unit for outputting an analog voice signal to the outside and a CPU controlling the respective elements, wherein communication between the main communication device and each sub communication device is performed in a time division multiple access manner. The present invention relates to a multilateral digital wireless communication system.

Description

Multilateral digital wireless communication system

1 is a schematic diagram illustrating a multilateral digital wireless communication system according to the present invention;

2 is a block diagram showing a main communication device of the multilateral digital wireless communication system according to the first embodiment of the present invention;

3 is a block diagram showing a sub communication apparatus of a multilateral digital wireless communication system according to a first embodiment of the present invention;

4 is a block diagram showing a stack table of the main communication device according to the present invention.

5 is a block diagram showing a main communication device of a multilateral digital wireless communication system according to a second embodiment of the present invention;

6 is a block diagram showing a sub communication apparatus of a multilateral digital wireless communication system according to a second embodiment of the present invention;

7 is an exemplary view showing a remote PTT device according to a second embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10; Main communication devices 11, 21, 31, 41; antenna

12, 22, 32, 42; RF input and output unit 13, 23, 33, 43; CPU

14, 34; Voice codecs 15 and 35; Voice input

16, 36; Voice output section 17, 27, 37, 47; PTT button

20, 40; Remote PTT device 30; Sub communication device

50, 60; Radios

The present invention relates to a multi-party digital wireless communication system, and more particularly, to a multi-party digital wireless communication system that allows a plurality of members located within a predetermined distance to freely perform two-way wireless communication.

In a police or military operation, in which 5 to 7 people work in small teams, each person carries a small radio for short-range communication for communication between team members. The short-range radio is operated in the following manner.

The short range communication radio is divided into a main communication device serving as a master and a sub communication device serving as a slave. Each sub communication device transmits and receives a voice signal only to the main communication device, and the main communication device includes all sub communication devices. It transmits and receives a voice signal for.

Therefore, one of the team members has a main communication device, and the other team members have a sub communication device which communicates with the main communication device. When one of the team members having the sub communication device inputs a voice signal through its sub communication device, the voice signal is transmitted to the main communication device, and the main communication device transmits the received voice signal to all the other sub communication. By sending to the device, communication is made between team members.

According to this conventional method, only one of the team members can transmit a voice signal through the radio, and the other team members can only receive the voice signal, so that two or more team members cannot talk at the same time. There is.

In addition, in the conventional short-range wireless communication method, a voice signal is transmitted and received using a PTT button formed on its radio (master device and slave device), that is, when the PTT button is pressed, the signal is transmitted, and when the PTT button is released, the reception state is released. Becomes In such a communication system, it is inconvenient to press and release the PTT button repeatedly according to the transmission and reception state.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a multilateral digital wireless communication system that allows a plurality of members to transmit and receive voice signals at the same time, so that they can freely communicate with each other. The purpose.

It is another object of the present invention to provide a multilateral digital wireless communication system that enables transmission and reception of voice signals without pressing a PTT button.

The multilateral digital wireless communication system according to the present invention for solving the above technical problem, the antenna for transmitting and receiving digital signals, the RF input and output unit for modulating or demodulating the digital signal transmitted and received through the antenna, the voice signal is input A main communication device including an input unit, a voice codec for mutually converting a digital voice signal and an analog voice signal, a voice output unit for outputting an analog voice signal to the outside, and a CPU for controlling the elements; An antenna for transmitting and receiving digital signals to and from the main communication device, an RF input / output unit for modulating or demodulating digital signals transmitted and received through the antenna, a voice input unit for inputting a voice signal, a voice codec for converting a digital voice signal and an analog voice signal to and from each other, And a plurality of sub communication devices including a voice output unit for outputting an analog voice signal to the outside and a CPU controlling the respective elements, wherein communication between the main communication device and each sub communication device is performed in a time division multiple access manner. Characterized in that made.

Also, in the present invention, the main communication device stores the voice signal received from each sub communication device and the voice signal input to the main communication device for each separate stack table, and the entire voice signal stored in the stack table is stored in each sub communication. And is output to the outside of the main communication device.

Also, in the present invention, the voice codecs of the main communication device and the sub communication device are configured to perform conversion between an analog voice signal and a digital voice signal using an ADPCM method of 4 bits or less.

Also, in the present invention, in order to extend the communication distance between the main communication device and the sub communication device, the main communication device and the sub communication device may each further include an RF output amplifier.

In addition, in the present invention, the main communication device is wired or wirelessly connected to the radio for the long-distance communication, the main communication device and / or sub-communication device further comprises a PTT button for controlling the radio to enable the long-distance communication, the PTT The voice signal input to the main communication device and / or the sub communication device while the button is pressed is transmitted over a long distance through the radio.

In addition, in the present invention, the voice signal input to the main communication device and / or sub communication device while pressing the PTT button is stored in each of the separate stack table in the main communication device, and then transmitted to each sub communication device, the main communication It is characterized in that the output to the outside of the device.

In addition, in the present invention, the analog voice signal received through the radio is output to the outside of the main communication device, is converted into a digital voice signal is stored in the stack table, characterized in that transmitted to each sub communication device.

In the present invention, the main communication device is wired or wirelessly connected to the radio for remote communication, a PTT button to which a control signal for controlling the radio is input, RF input and output for modulating the control signal into a radio frequency signal capable of wireless transmission And a remote PTT device configured to include an antenna for transmitting the modulated control signal to a main communication device and / or a sub communication device, and a CPU to control the respective devices, wherein the PTT button is pressed; The voice signal input to the main communication device and / or the sub communication device may be transmitted over a long distance through the radio.

In addition, the present invention is characterized in that, when the main communication device becomes unavailable, one of the sub communication devices is configured to replace the role of the main communication device in the set order.

Hereinafter, exemplary embodiments of a multilateral digital wireless communication system according to the present invention will be described in detail with reference to the accompanying drawings.

1 schematically shows a multilateral digital wireless communication system according to the present invention, and FIGS. 2 and 3 show a main communication device and a sub communication device of the multilateral digital wireless communication system according to the first embodiment of the present invention, respectively. It is. 4 shows a stack table of the main communication device according to the present invention.

Referring to FIG. 1, the multilateral digital wireless communication system according to the present invention includes a single main communication device 10 serving as a master and a plurality of subs serving as slaves for bidirectional communication with the main communication device 10. It comprises a communication device (30). For example, as shown in FIG. 1, one of the seven members includes the main communication device 10, and the remaining six people include the first to sixth sub communication devices 30. Two-way wireless communication is performed at a short distance.

Referring to FIG. 2, the main communication device 10 according to the present invention is a device that serves as a master to perform wireless communication with each sub communication device 30, and digitalizes each sub communication device 30. An antenna 11 for transmitting and receiving a signal, an RF input / output unit 12 for demodulating and transmitting a digital signal received through the antenna 11 into a high frequency signal capable of wireless transmission, and a voice input unit for receiving a voice signal. 15, a voice codec 14 for converting a demodulated digital voice signal through an RF input / output unit 12 into an analog voice signal and converting an analog voice signal input through the voice input unit 15 into a digital voice signal. It includes a voice output unit 16 for outputting the analog voice signal converted through the codec 14 to the outside, and a CPU 13 for controlling the respective elements.

Referring to FIG. 3, the sub communication device 30 according to the present invention serves as a slave to perform wireless communication with the main communication device 10, and provides a digital signal to the main communication device 10. An antenna 31 for transmitting and receiving, an RF input / output unit 32 for demodulating a digital signal received through the antenna 31 and modulating a digital signal for transmission into a high frequency signal capable of wireless transmission, and a voice input unit 35 for receiving a voice signal. ), A voice codec 34 and a voice codec for converting the demodulated digital voice signal through the RF input / output unit 32 into an analog voice signal and converting the analog voice signal input through the voice input unit 35 into a digital voice signal ( 34 is configured to include a voice output unit 36 for outputting the analog voice signal converted through the 34, and the CPU 33 for controlling the respective elements.

For example, when using a conventional wireless neck microphone as the sub communication device 30, the microphone constitutes the voice input unit 35, the earphone or speaker constitutes the voice output unit 36.

The communication between the main communication device 10 and each sub communication device 30 configured as described above is performed in a time division multiple access method.

For example, when a user having the first sub communication device 30a inputs a voice signal to the voice input unit 35 of his sub communication device 30a, an analog voice signal input to the voice input unit 35 is provided. Is converted into a digital speech signal by the speech codec 34. On the other hand, each sub communication device 30 has its own unique ID information, the signal including the ID information of the first sub communication device 30a and the digital voice signal together in the RF input and output unit 32 After being modulated into a high frequency digital signal to enable wireless transmission, the antenna 31 is transmitted to the main communication device 10 through the antenna 31.

The main communication device 10 receives a digital signal from the first sub communication device 30a through the antenna 11, and the received high frequency digital signal is a low frequency digital voice signal from the RF input / output unit 12. And an ID information signal. Thereafter, the CPU 13 of the main communication device stores the demodulated digital voice signal in a stack table corresponding to the ID of the first sub communication device 30a.

That is, the main communication device 10 stores the data of the received digital voice signal for each stack table of each sub communication device 30. For example, as shown in FIG. 4, the first sub communication device 30a ), The unique ID is S1, and the IDs of the remaining second to sixth communication devices 30b, 30c, 30d, 30e, and 30f are S2, S3, S4, S5, and S6, respectively. The digital voice signal of the first sub communication device 30a is stored in the S1 stack table, and the digital voice signals of the second to sixth sub communication devices 30b, 30c, 30d, 30e and 30f are stored in the remaining S2 to S6 stack tables. The signals are stored respectively. The unique ID of the main communication device 10 becomes M, and the digital voice signal input through the main communication device 10 is stored in the M stack table.

If the main communication device 10 receives the voice signal only from the first sub communication device 30a, the digital voice signal is stored only in the S1 stack table, and no data is stored in the remaining stack tables. If the main communication device 10 simultaneously receives voice signals from the first and second sub communication devices 30a and 30b, the digital voice signal will be stored only in the S1 and S2 stack tables.

As such, the main communication device 10 stores the digital voice signal received from each sub communication device 30 for each stack table corresponding to the ID of each sub communication device 30, and stores the entire voice signal data stored in the stack table. Is transmitted to each sub communication device 30 at regular intervals. Of course, the voice signal stored in the stack table is also output through the main communication device (10).

That is, the digital voice signals of the sub communication device 30 and the main communication device 10 stored in the stack table are modulated by the RF input / output unit 12 of the main communication device 10 at high frequency, and then the antenna 11 is turned on. It is transmitted to each sub communication device 30 through. In addition, the digital voice signal of the stack table received through the antenna 31 of each sub communication device 30 is demodulated by the RF input / output unit 32 of the sub communication device 30, and the voice codec 34 is analog voice. After being converted into a signal, it is output to the outside through the voice output unit 36. In addition, the digital voice signal of the stack table is converted into an analog voice signal by the voice codec 14 of the main communication device 10 and then output to the outside through the voice output unit 16. Therefore, the user of each sub communication device 30 and the main communication device 10 can listen to what other users say while talking.

On the other hand, the communication frequency band between the main communication device 10 and the sub communication device 30 is preferably made in the 2.4GHz to 2.525GHz.

The voice codecs of the main communication device 10 and the sub communication device 30 are configured to perform conversion between analog voice signals and digital voice signals using an adaptive differential pulse code modulation (ADPCM) method of 4 bits or less. It is preferable.

In the present invention, the communication distance between the sub communication device 30 and the main communication device 10 may be about 30M. However, if an RF output amplifier (not shown) is installed in the main communication device 10 and the sub communication device 30, respectively, the communication distance between the sub communication device 30 and the main communication device 10 may be increased to about 130M. . As such, multi-party communication between the main communication device 10 and the sub communication device 30 is possible only in a relatively short distance. Therefore, for telecommunications, the main communication device 10 according to the present invention is preferably configured to be connected to the radio 50 for telecommunications by wire or wireless.

That is, the main communication device 10 and each sub communication device 30 perform short-range wireless communication in a relationship between a master and a slave, respectively, and long-distance communication is performed through the radio 50 connected to the main communication device 10. In addition, the main communication device 10 may be directly connected to the transceiver 50 through the connection cable 52, or may be wirelessly connected at a short distance.

On the other hand, in the present invention, the main communication device 10 or the sub communication device 30 to control the radio 50 for long-distance communication, so that the radio ( PTT buttons 17 and 37 for controlling 50 are further included.

That is, when the PTT button 17 of the main communication device 10 is pressed, the CPU 13 of the main communication device controls the radio 50 to be in a state where remote communication is possible. When the voice signal is input through the voice input unit 15 while the PTT button 17 of the main communication device 10 is pressed as described above, the analog voice signal is transmitted to the other radio 60 at a long distance through the radio 50. Is sent. In addition, the voice signal input through the voice input unit 15 while pressing the PTT button 17 of the main communication device 10 is the same as when the voice signal is input without pressing the PTT button 17. After conversion to a digital signal by the codec 14, it is stored in the M stack table and transmitted to each sub communication device (30).

When the voice signal is input through the voice input unit 35 while the PTT button 37 of the sub communication device 30 is pressed, the radio control signal and the digital voice signal are combined with the high frequency digital signal from the RF input / output unit 32. After the conversion, it is transmitted to the main communication device 10 through the antenna 31. In the main communication device 10, the high frequency digital signal received through the antenna 11 is converted into a low frequency control signal and a digital voice signal by the RF input / output unit 12. At this time, the CPU 13 of the main communication device 10 controls the radio 50 by the control signal, so that the remote communication is possible. The digital voice signal is stored in the stack table of the corresponding sub communication device 30, and is also converted into an analog voice signal by the voice codec 14, and then the other radio 60 at a long distance through the radio 50. Is sent to. In addition, the entire digital voice signal stored in the stack table is transmitted back to each sub communication device 30, and simultaneously converted into an analog voice signal by the voice codec 14 of the main communication device 10, and then the voice output unit 16 ) Is output to outside.

As such, when a voice signal is input while the PTT buttons 17 and 37 of the main communication device 10 or the sub communication device 30 are pressed, each sub communication device is operated as in the case where the PTT buttons 17 and 37 are not pressed. 30 is output through the audio outputs 16 and 36 of the main communication device 10, and is simultaneously transmitted remotely through the radio 50.

On the other hand, when a voice signal is received from the other radio 60 in the distance through the radio 50, the analog voice signal received through the radio 50 is digital in the voice codec 14 of the main communication device 10 After being converted to an audio signal, it is stored in the M stack table. If a separate voice signal is also input through the voice input unit 15 of the main communication device 10 while the voice signal is received from the radio, the analog voice signal and the voice input unit 15 received through the radio 50 are received. The analog voice signal input through is synthesized and then converted into a digital voice signal by the voice codec 14 and stored in the M stack table.

In this way, the voice signal received through the transceiver 50 is transmitted to each sub communication device 30 together with other digital voice signals stored in the stack table, and at the same time through the voice output unit 16 of the main communication device 10. Is output. Accordingly, voice signals received through the transceiver 50 may also be received by all the sub communication device 30 and the main communication device 10.

5 and 6 illustrate a main communication device and a sub communication device of the multilateral digital wireless communication system according to the second embodiment of the present invention, and FIG. 7 shows a remote PTT device according to the second embodiment of the present invention. Is shown.

5 to 7, in the second embodiment of the present invention, the PTT button for controlling the radio for remote communication is configured to be separated from the main communication device 10 and / or the sub communication device 30. . Except that the PTT button is separated from the main communication device 10 and / or the sub communication device 30 to configure the remote PTT devices 20 and 40 in the configuration of the first embodiment. In most cases, the configuration and operation are the same as those of the first embodiment.

5 and 6, in the second embodiment of the present invention, a remote PTT device 20, 40 that transmits a signal wirelessly at a short distance with the main communication device 10 and / or the sub communication device 30 is A PTT button (27, 47) to which a radio control signal for controlling a radio is input; an RF input / output unit (22, 42) for modulating the control signal into a radio frequency signal capable of wireless transmission; and main communication of the modulated control signal Antennas 21 and 41 for transmitting to the device 10 and / or sub communication device 30, and CPUs 23 and 43 for controlling the respective elements. That is, the remote PTT devices 20 and 40 form a master / slave relationship with the main communication device 10 and / or the sub communication device 30. In this case, the main communication device 10 and / or sub communication The device 30 acts as a master and the remote PTT devices 20 and 40 act as slaves.

When the PTT buttons 27 and 47 of the remote PTT devices 20 and 40 configured as described above are pressed, radio control signals for controlling the radio 50 for long distance communication are generated by the CPUs 23 and 43 to provide an RF input / output unit ( 22, 42, and the radio control signal is modulated into a high frequency signal by the RF input / output unit 22, 42, and then located near the main communication device 10 and / or via the antennas 21, 41 and / or The sub communication apparatus 30 is transmitted. Thereafter, the CPU 13 of the main communication device 10 controls the radio 50 by the control signal, thereby enabling a long distance communication. The rest of the process proceeds in the same manner as in the first embodiment.

And, referring to Figure 7, the remote PTT device 20, 40 according to the second embodiment of the present invention is preferably configured with a fastening means 70 that can be attached to a gun or wrist, wrist, and the like. For example, when the remote PTT device 20, 40 is attached to the gun, the conversation is performed when the user speaks without pressing the PTT buttons 27, 47 of the remote PTT device 20, 40. 10 and the sub-communication device 30 are outputted, and when the user speaks while pressing the PTT buttons 27 and 47 of the remote PTT device 20 and 40, the conversation is performed through the main communication device 10. In addition to being output through the sub communication device 30 and each other, it is transmitted to the other radio 60 in the distance through the radio (50).

On the other hand, when the main communication device 10 serving as a master in the multilateral digital wireless communication system according to the present invention becomes unusable due to a power failure or failure, communication between the sub communication devices 30 is also cut off. . In order to prevent this, in the present invention, it is preferable that one of the sub communication devices 30 is configured to replace the main communication device 10 which has become unusable to serve as a master.

That is, priorities for acting as a master for each of the plurality of sub communication devices 30 are determined. For example, the first sub communication device 30a is given first and the second sub communication device 30b is given second. When the third sub communication device 30c is set to replace the role of the main communication device 10 by the third priority, when the main communication device 10 serving as the master becomes unavailable, the first sub communication set to the first priority The device 30a replaces the role of the main communication device 10. Accordingly, each sub communication device 30 transmits a digital signal to the first sub communication device 30a, and the first sub communication device 30a stores the digital voice signals of the received sub communication devices 30, respectively, in the stack table. After storing the data, the entire digital voice signal data stored in the stack table is transmitted to each sub communication device 30.

When even the first sub communication device 30a is not available, the second sub communication device 30b set as the second rank serves as a master.

While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

According to the multi-party digital wireless communication system according to the present invention having the configuration as described above, a plurality of members located at a short distance can perform wireless communication with each other at the same time.

In addition, according to the present invention, there is no need to press the PTT button in the near-field two-way wireless communication can be improved user convenience.

In addition, according to the present invention, there is an advantage that long-range communication is also possible by controlling the radio as needed.

Claims (9)

An antenna for transmitting and receiving digital signals, an RF input and output unit for modulating or demodulating digital signals transmitted and received through the antenna, a voice input unit for inputting a voice signal, a voice codec for converting a digital voice signal and an analog voice signal, and an analog voice signal. A main communication device including a voice output unit configured to output a voice signal, and a CPU controlling the respective elements; An antenna for transmitting and receiving digital signals to and from the main communication device, an RF input / output unit for modulating or demodulating digital signals transmitted and received through the antenna, a voice input unit for inputting a voice signal, a voice codec for converting a digital voice signal and an analog voice signal to and from each other, And a plurality of sub communication devices including a voice output unit configured to output an analog voice signal to the outside and a CPU controlling the respective elements. Communication between the main communication device and each sub communication device is performed in a time division multiple access method; The main communication device stores the voice signal received from each sub communication device and the voice signal input to the main communication device for each separate stack table; The entire voice signal stored in the stack table is transmitted to each sub communication device and output to the outside of the main communication device; And when the main communication device becomes unavailable, one of the sub communication devices is configured to replace the role of the main communication device in the set order. delete The method of claim 1, The voice codec of the main communication device and the sub communication device is configured to perform conversion between an analog voice signal and a digital voice signal using an ADPCM method of 4 bits or less. The method of claim 1, In order to extend the communication distance between the main communication device and the sub communication device, the main communication device and the sub communication device each further comprises an RF output amplifier. The method according to any one of claims 1, 3 and 4, The main communication device is wired or wirelessly connected to the radio for telecommunications, The main communication device and / or sub communication device further includes a PTT button for controlling the radio to enable long-distance communication. And a voice signal input to a main communication device and / or a sub communication device while the PTT button is pressed is transmitted at a long distance through a radio. The method of claim 5, The voice signal input to the main communication device and / or the sub communication device while pressing the PTT button is stored in the main communication device by each stack table, and then transmitted to each sub communication device and output to the outside of the main communication device. Multi-party digital wireless communication system, characterized in that. The method of claim 5, The analog voice signal received through the radio is output to the outside of the main communication device, is converted into a digital voice signal is stored in the stack table and transmitted to each sub communication device, characterized in that the multi-party digital wireless communication system. The method according to any one of claims 1, 3 and 4, The main communication device is wired or wirelessly connected to the radio for telecommunications, A PTT button to which a control signal for controlling a radio is input, an RF input / output unit for modulating the control signal into a radio frequency signal capable of wireless transmission, an antenna for transmitting the modulated control signal to a main communication device and / or a sub communication device; And a remote PTT device configured to include a CPU for controlling each of the elements. And a voice signal input to a main communication device and / or a sub communication device while the PTT button is pressed is transmitted at a long distance through a radio. delete
KR1020070035386A 2007-04-11 2007-04-11 Multilateral digital wireless communication system KR100845098B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100915839B1 (en) * 2009-04-23 2009-09-07 성진씨앤티(주) Multilateral wireless communication system
KR101970225B1 (en) * 2018-10-26 2019-08-27 엘아이지넥스원 주식회사 Push-to-talk radio and radio method using the same

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Publication number Priority date Publication date Assignee Title
KR20040106786A (en) * 2003-06-11 2004-12-18 넥스원퓨처 주식회사 Wireless receive-send system using bluetooth and mehod thereof
KR20050009929A (en) * 2003-07-18 2005-01-26 넥스원퓨처 주식회사 Wireless receive-send system using bluetooth and non-communication method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040106786A (en) * 2003-06-11 2004-12-18 넥스원퓨처 주식회사 Wireless receive-send system using bluetooth and mehod thereof
KR20050009929A (en) * 2003-07-18 2005-01-26 넥스원퓨처 주식회사 Wireless receive-send system using bluetooth and non-communication method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100915839B1 (en) * 2009-04-23 2009-09-07 성진씨앤티(주) Multilateral wireless communication system
KR101970225B1 (en) * 2018-10-26 2019-08-27 엘아이지넥스원 주식회사 Push-to-talk radio and radio method using the same

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