JP2000236307A - Multiple radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple radio communication device capable of easily constructing a multiple communication line by utilizing the data communication line of a mobile communication network while using a miniaturized portable radio device. SOLUTION: Multiple radio communication devices 10 and 30 are composed of telephone sets 1a-1c, switching devices 2 and 4, voice encoders 3a-3c, a line control unit 5, a control unit 6, an interface part 7, a portable telephone set 8 and an antenna 9. An audio signal generated by the telephone set 1a of the multiple radio communication device 10 is encoded by the voice encoder 3 and subsequently multiplexed by the line control unit 5. The multiplexed signal is transmitted through the data communication line of a mobile communication network 20 to an opposite multiple ratio communication device 30 by the portable telephone set 8. The multiple radio communication device 30 demultiplexes and decodes the received multiple digital signal. On the basis of the decoded signal, the switching device 2 selects and connects an audio line to be connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex radio communication apparatus for transmitting a multiplexed audio signal and image signal by a portable telephone via a mobile communication network.

[0002]

2. Description of the Related Art Conventionally, when a communication line is installed in a place where it is difficult to lay a fixed communication line due to a remote location, for example, a communication line is provided in a construction site office in a mountainous area, or the communication equipment is damaged, the communication line is interrupted. When a communication line is urgently secured at a disaster site, a wireless device having a relatively low wireless frequency and a small transmission capacity, for example, a simple voice transmission using a VHF band wireless frequency is used. Wireless devices and the like are used. Alternatively, when laying a communication line for transmitting a few voice channels having a slightly larger transmission capacity, use the frequency of the VHF band or the UHF band, and provide an antenna, a radio device, a multiplexer, a switching device, a power supply, etc. Facilities designed to be used are used. In order to install such radio equipment and use radio waves, it is necessary to obtain radio frequency use approval in advance.

[0003]

As described above, the transmission capacity is small in the case of a conventional simple wireless device in the VHF band, and in the case of a multiplex wireless communication device, the transmission capacity of an antenna, a wireless device or the like is low. Such as securing installation locations and constructing these devices,
There is a problem that much work is required to set up a communication line. In addition, when using a wireless device, it is necessary to obtain a license for radio frequency.However, the lack of radio frequencies currently limits the use of radio frequencies for which approval can be obtained. There is a problem that it is very difficult to obtain a license because it is necessary to prevent frequency interference with the communication line.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to use a small and portable wireless device and use data communication of a mobile communication network, for example, packet communication. It is an object of the present invention to provide a multiplex wireless communication device that can easily construct a multiplex communication line. Still another object of the present invention is to provide a multiplex wireless communication apparatus that can install a communication line by a simple method using a wireless apparatus that does not need to obtain a license for using radio frequency.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises encoding means for encoding a plurality of audio signal or video signal inputs and outputting a digital signal; A multiplexing unit that time-division multiplexes the digital signals of the respective sequences output by the encoding unit, and transmits an output of the multiplexing unit to an opposing mobile phone via a mobile communication network; A mobile phone that receives a signal transmitted through the mobile communication network, a separating unit that separates the time-division multiplexed signal received by the mobile phone, and an audio signal or a video signal that is separated by the separating unit. A composite means for decoding the signal is provided.

According to a second aspect of the present invention, in the multiplex radio communication apparatus according to the first aspect, the encoding means includes a switching circuit for switching and controlling a plurality of streams of audio signals or video signals, and the switching circuit. And a coding circuit for coding the selected signal.

According to a third aspect of the present invention, in the multiplex wireless communication apparatus according to the first aspect, the plurality of streams of audio signals are output signals of a plurality of telephones. According to a fourth aspect of the present invention, in the multiplex wireless communication apparatus according to the first aspect, the communication line through which the mobile phone transmits and receives is a line used for digital data communication of a mobile communication network.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a multiplex wireless communication apparatus according to an embodiment of the present invention. In this figure, multiplex wireless communication apparatuses 10, 30
Is a switching device that controls switching between the telephones 1a to 1c and the telephones 1a to 1c, or detects a call signal from a signal from the voice encoding device 3a to 3c and connects to one of the telephones 1a to 1c. 2 and telephones 1a-1c
Encoding device 3a that encodes the output of the above and outputs a digital signal or decodes the input signal to generate an audio signal
To 3c, and a switching device 4 for controlling switching of voice lines
A line controller 5 for time-division multiplexing the outputs of the speech encoders 3a to 3c or separating the input digital signal;
An interface unit 7 and a mobile phone 8 for transmitting and receiving multiplexed signals using a data communication line of a mobile communication network
And a control device 6 for controlling transmission and reception of the mobile phone 8, and an antenna 9. Then, the multiplex wireless communication device 10 is connected to the multiplex wireless communication device 30 that is opposed via the mobile communication network 20.

The VSELP system is used as a standard encoding system for the speech encoding devices 3a to 3c. However, the present invention is not limited to this system, and other systems such as PSI-CELP can be used. In addition, as an access method of the mobile phone 8, a TDMA (time division multiple access) method, a CDMA (code division multiple access) method, or the like adopted in a mobile communication network can be used. In FIG. 1, the line control device 5
Although the three channels output from the audio encoding devices 3a to 3c are time-division multiplexed, the number of channels to be multiplexed is determined by the speed of data transmitted by the mobile phone 8 and the output of the audio encoding device. For example, when packet communication of a mobile communication network is used, the data rate is 28.8 Kbit / sec, and the output of the speech coding system is 6.25 Kbit / sec.
When the CELP method is used, three-channel audio signals can be transmitted. When a higher speed data communication line of a mobile communication network using the CDMA system is used, the number of voice channels to be transmitted can be further increased.

Next, the operation of the apparatus having the above configuration will be described. A case in which the telephone 1a of the multiplex wireless communication apparatus 10 calls the telephone 1a of the multiplex wireless communication apparatus 30 to make a call will be described. First, when a caller puts the telephone 1a off-hook and a call signal is supplied from the telephone 1a to the switching device 2, the switching device 2 switches to a voice coding device to which no voice line is connected, for example, a voice coding device. The device 3a is selected to supply the output of the telephone 1a. Audio encoding device 3a
Encodes an input signal and outputs a digital signal. The output of the speech encoding device 3a is supplied to the line control device 5 via the switching device 4. The line controller 5 allocates one of the time-divided three-channel time slots to the input signal and performs time-division multiplexing. The control device 6 includes the line control device 5
, The mobile phone 8 is controlled to transmit a dial signal to the mobile communication network 20 by detecting the occurrence of a new call. The mobile communication network 20 calls the opposite multiplex wireless communication device 30 based on the dial signal.

The mobile phone 8 of the multiplex radio communication device 30
It demodulates the signal received via the antenna 9 and outputs a digital signal. The demodulated digital signal is supplied to the control device 6 via the interface unit 7. Control device 6
Establishes a data line with the multiplex wireless communication device 10 based on the input signal. When the data line is established, the digital signal is supplied to the line controller 5. The line control device 5 separates the supplied multiplexed digital signal, and supplies the output to the audio encoding devices 3a to 3c via the switching device 4. The audio encoding device 3 a decodes the input signal and supplies the signal to the switching device 2. The switching device 2 calls the telephone 1a according to a calling signal detected from the input signal.

When a caller off-hooks telephone 1a in response to a call of telephone 1a of multiplex wireless communication apparatus 30 and starts talking, a voice signal output from telephone 1a is supplied to switching apparatus 2. The audio encoding device 3a performs band compression and encoding of the audio signal input via the switching device 2 to generate a digital signal. The digital signal generated by the audio encoding device 3a is supplied to the line control device 5 via the switching device 4. The line control device 5 time-division multiplexes the supplied digital signal and outputs it. Line controller 5
Is supplied to the mobile phone 8 via the control device 6 and the interface unit 7. The mobile phone 8 transmits the input signal to the multiplex wireless communication device 10 via the mobile communication network 20.

The mobile phone 8 of the multiplex radio communication device 10
It demodulates the signal received via the antenna 9 and outputs a digital signal. The demodulated digital signal is supplied to the line control device 5 via the interface unit 7 and the control device 6. The line control device 5 separates the input digital signal, and supplies the digital signal of the audio line to the switching device 4. The switching device 4 supplies the supplied digital signal to the audio encoding device 3a. The audio encoding device 3a expands and decodes the input digital signal to generate an audio signal. The speech generated by the speech encoding device 3a is transmitted to the telephone 1
a. Then, the voice input to the telephone 1a by the caller of the multiplex wireless communication device 10 is transmitted to the opposing multiplex wireless communication device 30 via the mobile communication network 20 by the same operation as described above, and a call is made.

When the telephone is finished and the telephone 1a is on-hook, the control device 6 detects the on-hook state. After detecting the on-hook state, the control device 6
Make sure that no other voice line is busy
To terminate the data line connection. In the embodiment of the present invention, voice communication is described. However, when transmitting an image, the image is transmitted by the same operation as described above by using an image input / output device and an encoding / decoding device.

[0015]

As described above, according to the present invention,
By using a small and portable wireless device and using a data communication line of a mobile communication network, a multiplex communication line can be easily installed, so that an effect of economically constructing a communication line is obtained. In addition, since a wireless device that does not require the acquisition of radio frequency use authorization is used, an effect is obtained in that the communication line can be secured without being restricted by the purpose and location of the communication line.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

 1a-1c Telephone 2, 4 Switching device 3a-3c Voice coding device 5 Line control device 6 Control device 7 Interface unit 8 Mobile phone 9 Antenna 10, 30 Multiplexed radio communication device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K028 AA06 BB04 EE03 KK01 KK03 SS04 SS05 SS14 SS15 5K067 AA13 BB04 BB21 CC04 DD52 DD54 EE02 GG01 GG11 5K101 LL12 MM05 MM06 NN06 NN07 NN21 SS01 SS07 SS08

Claims (4)

[Claims] An encoding unit that encodes a plurality of streams of audio signal or video signal inputs and outputs a digital signal; a multiplexing unit that time-division multiplexes each series of digital signals output by the encoding unit; A mobile phone that transmits an output of the multiplexing unit to an opposing mobile phone via a mobile communication network, and receives a signal transmitted from the opposing mobile phone via the mobile communication network; A multiplex wireless communication apparatus comprising: a separating unit that separates the received time-division multiplexed signal; and a combining unit that decodes the signal separated by the separating unit into an audio signal or a video signal. 2. The image processing apparatus according to claim 1, wherein said encoding means includes a switching circuit for switching and controlling a plurality of streams of audio signals or video signals, and an encoding circuit for encoding a signal selected by said switching circuit. The multiplex wireless communication device according to claim 1. 3. The multiplex radio communication apparatus according to claim 1, wherein said plurality of streams of audio signals are output signals of a plurality of telephones. 4. The multiplex radio communication apparatus according to claim 1, wherein the communication line through which the mobile phone transmits and receives is a line used for digital data communication of a mobile communication network.