JPS63301661A - Light transmitting type communication telephone - Google Patents

Abstract

PURPOSE:To increase the number of handsets, to multiplex plural channels and to execute a communication by executing the communication to other station in the form of a digital signal through an optical transmission path. CONSTITUTION:The communication between the respective stations 1-3 is executed in the form of the digital signal through the optical transmission paths OC1, OC2, OC11, OC12. The communication executed by making a terminal station the starting point of a transmission is transmitted sequentially from a relay station 2 to a return station and transmission signals from the respective stations are overlapped. At this time, a signal from the station belonging to the same channel is applied added the same channel to discriminate from other channel. The contents of the communication on which the signals of all the stations are returned in the return station 3 and retransmitted from the relay station 2 and the terminal station 1. The respective stations take out only the signal of the channel to which the next station belongs of the returned signals and output from the receiver of the handset as a sound. Thereby, a simultaneous speech between the stations belonging to the same channel can be attained to increase the number of the connected handsets.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention enables communication between a plurality of telephone sets and transmits signals between the telephone sets via an optical transmission line (optical fiber). This article relates to the configuration of an optical transmission type contact telephone.

[Prior Art] Figure f53 shows the configuration of a conventional optical transmission contact telephone. Hereinafter, the configuration J3 and operation of a conventional optical transmission contact telephone will be explained with reference to FIG.

In Fig. 3, J3 is a conventional optical transmission type N-N telephone, which has a terminal station 1 installed at one end of the line that can make calls, and a relay that connects with the terminal station 1 and relays communication with the terminal station 1. The network includes a station 2, and a return station 3, which is provided at the other end of the line and receives communication from the relay station 2 and sends the communication back to the relay station 2. Although only one relay station is shown here, the relay station is the return station 3.
A plurality of relay stations are provided between the relay station 2 and the relay station 2.

Optical fiber ○C1,0CI 1゜0G2 is installed between terminal station 1 and middle 11r:02 and between relay station 2 and return station 3.
1.002 is provided. That is, communication between each station is carried out in the form of optical signals through optical fibers.

The terminal station 1 includes a handset 11 that transmits and receives analog audio signals, and an electrical-to-optical converter 12 that converts the analog audio signal from the handset 11 into an optical signal and transmits it onto the optical fiber OC1.
and an optical-to-electrical converter 13 that converts an analog optical signal provided via the optical fiber OC2 into an electrical signal and sends it to the handset 11 (4).

The relay station 2 includes a handset 21 that transmits and receives an analog sound νh4n, an optical-to-electrical converter 22 that converts an optical signal from the optical fiber OC1 into an electrical signal, and an optical-to-electrical converter 22 that converts an optical signal from the optical fiber OC1 into an electrical signal. Signal addition V that receives and adds analog signals! A23, an electrical-to-optical converter 24 that receives an analog electrical signal from the signal filter 23, converts it into an optical signal, and transmits it onto the optical fiber 0C11, and converts the optical signal from the optical fiber 0C21 into an electrical signal No. 15. and an optical-to-electrical converter 25 for supplying the signal to the handset 21 and to the electrical-to-optical converter 26.

The return station 3 has a handset 3 that transmits and receives analog voice signals.
1, an optical-to-electrical converter 32 that converts the analog optical signal from the optical fiber OCI 1 into an electrical signal and supplies it to the handset 31 and the signal mouthpiece 33;
Signal n for adding analog signals from the electrical converter 32
and an electro-optical converter 34 that receives an analog signal from the signal C) device 33, converts it into an optical signal, and transmits it onto the optical fiber 0C21.

The optical fibers OC1, OC11, 0C21, and QC2 form one loop with the terminal station 1 as the starting point and the return station 3 as the return point. Next, the operation will be explained.

First, the handset 1 of the terminal station 1 is activated and the analog a j
I (n 54) and supplies it to the electro-optical converter 12. The electro-optical converter 12 receives the analog audio signal given from the transmitter/receiver i5!11 and converts it into an optical signal. The optical conversion 1512 performs an analog direct modulation method in which the analog signal width is directly modulated into the intensity of light. , where it is converted into an analog electrical signal.Optical-to-electrical converter 22
The analog 0g electricity No. 13 from is given to the signal generator 23.

The adder 23 adds the analogue electrical signal from the optical-to-electrical converter 22 and the analog audio signal from the handset 21.
(superimpose). Electric signal added by signal adder 23? 5 is directly modulated by the electro-optical converter 24C'' into a change in light intensity and transmitted onto the optical fiber 0C11. Return station 3
Then, an optical signal applied via the optical fiber 0C11 is converted into an electrical signal via the optical-to-electrical converter 32, and the signal is received by the handset 31. The transmitted analog audio signal from the handset 31 is added (superimposed) with the analog electrical signal from the optical-to-electrical converter 32 in the signal converter 33 and is applied to the electrical-to-optical converter 34 . The electrical-optical converter 34 converts the applied analog electrical signal into an optical signal and connects it to the optical fiber 0C21.
Communicate upward. At this time, the electro-optical converter 34 also performs analog direct modulation.

The analog optical signal from the optical fiber 0C21 is converted into an electrical signal by the optical-to-electrical converter 25, and is applied to the handset 21 and also to the electrical-to-optical converter 26. The electric-to-optical converter 26 converts the applied analog electric signal into an optical signal and supplies it to the optical-to-electrical converter 13 of the terminal station 1 via the optical fiber OC2.

The analog electrical signal from the optical-to-electrical converter 21i13 is provided to the handset 11. As described above, the a-angle signal from the terminal station 1 is sequentially transmitted to the relay station 2. It is given to the return station 3, and each relay station 2 and the return station 3 use the return station 3 as the return point.
The transmission signal from the central station 2 is sent back to the middle station 2 and the terminal station 1 via the optical fibers 0C21 and 0G2.

[Problem 1 to be solved by the invention As described above, conventional optical transmission type communication 1! In the story,
Signal transmission between stations is carried out in the form of optical signals via optical fibers, but since communication is carried out as analog signals, when the number of connected handsets (handsets) increases, the number of handsets increases. There was a problem in that the number of m-tones increased, and when a large number of devices were connected, sufficient communication could not be achieved using these m-tones. In addition, since the conversion of electrical signals to optical signals and the conversion of optical signals to electrical signals are both performed using analog direct modulation, it is possible to multiplex communications of multiple channels in optical fiber communication formats. There was a problem in that it was difficult to do this, and only simultaneous calls could be made by all stations.

Therefore, an object of the present invention is to eliminate the above-mentioned problems of the conventional optical transmission contact telephone, increase the number of handsets, divide the handsets into groups of multiple channels, and connect optical fibers. Multiple channels through 1? An object of the present invention is to provide an optical transmission type 31-line telephone that can perform communication by multiplexing channels.

[Means for solving problems]

The optical transmission 31-line telephone according to the present invention is configured to communicate with other stations in the form of digital signals via an optical transmission line.

[Function] Since communication between each station is carried out in the form of digital signals via optical transmission, unlike 7-nolog communication, the m-tone does not increase even if the number of handsets and receivers connected is increased. It also becomes easy to multiplex communication between each station.

Embodiment 1 of the Invention Hereinafter, embodiments of the invention will be described with reference to the drawings.

FIG. 1 shows the structure of an optical transmission type 31-line telephone which is an embodiment of the present invention. Hereinafter, the configuration and operation of an optical transmission type $8 ff1 episode, which is an embodiment of the present invention, will be explained with reference to FIG.

In FIG. 1, the optical transmission telephone according to the present invention is
As in the conventional case, the terminal station 1, relay station 2, and return station 3 are moved to the right. Communication between each station is via optical fiber OC1, ○G11.0
This is done via C21 and OC2. Terminal station 1 is a transmitter/receiver F,! that transmits and receives analog signals. , 1ff 111, an A/D converter 15 that converts an analog signal from the handset 11 into a digital signal such as a PCM (pulse code modulation) signal, and an A/D'a converter 1.
A multiplexer 16 receives the signal from the multiplexer 16 and multiplies it into, for example, hours and minutes vJ, and receives the digital signal from the multiplexer 16 and converts it into an optical signal and connects it to the optical fiber OC1.
an electrical-to-optical converter 12 transmitting upwards and an optical fiber OC2
an optical-to-electrical converter 13 that receives a digital optical signal from the optical-to-electrical converter 13 and converts it into an electrical signal; The two relay stations 2 are equipped with a multiplexer 17 that receives the digital signal from the multiplexer 17 and converts it into an analog signal and provides it to the transmitter/receiver 21111 via the optical fiber OC1. Optical-to-electrical converter 22 that converts digital optical signals into electrical signals
And light-electric transformation I! A multiplexer 201 receives the digital signal from the A unit 22, selects only the digital signal of the channel to which the relay station 2 belongs, and supplies it to the D/A converter Pi 202, and supplies digital signals of other channels to the multiplexer 204;
A D/A converter 202 receives a digital signal belonging to the channel of the own station selected in , converts it into an analog signal, and transmits it to the signal adder 23, and an analog signal from the handset 21 and the D/A converter 202. a signal adder 23 that receives and outputs an analog signal from the signal side ngA 23, and an A/D converter 2 that receives an analog signal from the signal side ngA 23 and converts it into a digital signal.
03, a multiplexer 204 that receives, multiplexes and transmits the digital signal from the A/D converter 203 and the signal from the multiplexer 201, and an electro-optical converter 2124 that receives the digital signal from the multiplexer 204 and converts it into an optical signal. and an optical-to-electrical converter 2 that receives a digital optical signal from the optical fiber 0C21 and converts it into an electrical signal No. 4a.
5, receives the digital signal from the optical-to-electrical converter 25, selects the digital signal of the channel to which its own station (relay station 2) belongs, and supplies it to the D/A converter 206, while also transmitting digital signals of other channels. A multiplexer 205 supplies the digital signal to the multiplexer 207, a D/A converter 206 receives the digital signal No. 13 from the multiplexer 205, converts it into an analog signal, and transmits it to the handset 21, and the digital signal from the multiplexer 205 is received and multiplexed. a multiplexer 207 that transmits the digital signal;
It includes an electrical-to-optical converter 26 that receives the digital signal from the multiplexer 207, converts it into an optical signal, and transmits it onto the optical fiber 002.

The JJi return station 3 receives a digital optical signal from the optical fiber OC11 and converts it into an electrical signal.
2 and a digital signal from the optical-electric converter 32, which sends only the signal of the channel to which the own station (return station 3) belongs to the D/A converter 302, and sends other signals to the multiplexer 3.
04 and the D/A converter 3.
02 and receives the analog signal from the handset 31.
A signal adder 33 receives and processes analog signals from the signal side 0 unit 33 and outputs the analog signals, an A/D converter 303 receives analog signals from the signal side zero unit 33 and converts them into digital signals, a multiplexer 301 and an A/D A multiplexer 30 receives and multiplexes digital signals from the converter 303 and outputs the multiplexed signals.
4, and an electro-optical converter 34 that receives the digital signal from the multiplexer 304, converts it into an optical signal, and transmits it onto the optical fiber 0C21.

In the above configuration, the multiplexer in the transmission ε section of each station multiplexes and transmits the given digital signal (for example, by time division multiplexing), and the multiplexer provided in the receiving section of each station transmits the multiplexed digital 4m8 signal. Selects and extracts only the digital signal of the channel to which the own station belongs.Next, the operation will be explained.

First, communication is started with the transmitting side of the terminal station 1 set to 1j, t. That is, the analog sound jtj from the handset 11
The signal is converted into a digital signal by an A/D'a converter 15 and then applied to a multiplexer 16.

The multiplexer 16 multiplexes the signals from the transmitter/receiver 21i11 so that they belong to the channel selected by the terminal station 1, and provides the multiplexed signals to the electro-optical converter 12. The digital signal provided via the optical fiber OC1 is converted into electricity (Z signal) by the optical-to-electrical converter 22 of the relay station 2.
receives the multiplexed digital signal from the optical-to-electrical converter 22, selects and extracts the digital signal of the channel to which its own station (relay station 2) belongs, and supplies it to the D/A converter 15i202.

The signal unit 23 transmits and receives analog signals from the D/A converter 21i202! It receives the analog signal from A21, converts it (m tatami), and supplies it to the D/A converter 203. The multiplexer 204 receives and multiplexes the digital optical signal from the A/D 11203 and the digital signal from the multiplexer 201 other than its own station, and outputs it. At this time, the multiplexer 204 multiplexes the audio signals of the channel i of its own station so as to combine them into the same channel, and outputs the multiplexed signals.

Electrical-to-optical converter 24 converts the digital signal from multiplexer 204 into an optical signal and transmits it onto optical fiber 0C11. The optical-to-electrical converter 32 of the return station 3 converts the applied optical signal into a digital signal and sends it to the multiplexer 3.
Give to 01. The multiplexer 301 selects the digital signal of the channel to which its own station (return station 3) belongs, extracts it, and supplies it to the D/A converter 302. The analog signal from the D/A converter 302 is given to the handset 31 and also to the signal tli! ! ! Given to 33. Signal unit 33
receives the analog signal 45 from the D/A converter 302 and the analog signal from the handset 31, modifies it, and supplies it to the A/D converter 303. The signal converted into a digital signal by the A/D converter 303 is multiplexed with the digital signal from the multiplexer 301 by a multiplexer 304, and is applied to the electro-optical converter 34. Electrical-optical converter 34
The signal from the relay station 2 is applied to the optical-to-electrical converter Wji 25 of the relay station 2 via the optical fiber 0C21. Light-electric converter 2
A multiplexer 205 selects and extracts only the digital signal of channel a of its own station (relay station 2), and supplies it to a D/A converter 206. Multiplexer 205 also connects Chitnel No. 18, to which relay station 2 does not belong, to multiplexer 207.
Communicate to. No. 15 converted into an analog signal by the D/A converter 206 is provided to the handset 21. The multiplexer 207 supplies the applied multiplexed digital signal as it is to Denki-Sen'an 1'M21!26. A digital signal applied from the electric-to-optical converter 26 via the optical fiber OC2 is converted into an electric signal by the optical-to-electrical transformer PA unit 13 of the terminal station 1, and is applied to the multiplexer 17. The multiplexer 17 selects the digital signal of the channel to which its own station (terminal station 1) belongs from the applied digital signals, takes it out, and supplies it to the D/A converter 18.

The digital signal converted by the D/A converter zia is given to the handset 11.

As described above, the communication performed with the terminal station 1 as the starting point for transmission is sequentially transmitted from the relay station 2 to the return station, and the sent item 4? ijl are superimposed. At this time, signals from stations belonging to the same channel are added to the same channel and distinguished from other channels. This operation is performed by a multiplexer. The communication content carrying the signals of all the stations is looped back at the loopback station 3 and transmitted again to the relay station 2 and the terminal station 1. Each station extracts only the fR@ of the channel to which the next station belongs from the returned signal and outputs it as audio from the receiver of the handset. This makes it possible to simultaneously call 8 books belonging to the same 17 channels.

In addition, multiple channels can be multiplexed using a multiplexer, so by assigning a separate channel to each station and providing each station with channel switching means, it can be used in the same way as a regular telephone. You can also divide the entire system into several groups and make simultaneous calls within the group.

In this way, when digital signals are used for communication, signals that are unrelated to the transmission and reception of the own station are relayed as digital signals, which increases noise due to relaying and optical loss in the middle of the transmission path. tsb can be reduced as much as possible, and the number of connected handsets can be increased compared to the conventional method.

FIG. 2 is a diagram showing an example of the configuration of the optical transmission contact telephone according to the present invention when applied to a field. The configuration shown in Figure 2 is intended for use at power transmission line construction sites. Hereinafter, the configuration of an optical transmission contact telephone according to another embodiment of the present invention will be explained with reference to FIG. First, the configuration consists of a terminal station 1 that serves as the starting and ending point of communication, relay stations 2a and 2b that relay communications from terminal station 1, and a return station that loops back communication 4ii from relay station 2b and transfers it to relay station 2b. 3
Equipped with. The terminal station 1 includes a handset 101 consisting of, for example, headphones, a handset main body 102, an electro-optical converter 12 that converts an electrical signal from the main body 102 into an optical signal, and an optical transceiver 12 that converts an electrical signal from the main body 102 into an optical signal. - The electrical converter 13 receives the optical signal from the electrical-to-optical converter 1M12 and the digital signal from the optical fiber OC5, and supplies operating power to the optical divider 103, which distinguishes between the transmitted signal and the received signal, and the main body 1. For example, AC/DC conversion v! that converts AClooV to DC! A104. Main body 1
02 is equipped with a paging switch 105 for calling a station belonging to the same channel or a desired channel, and a paging speaker 106 for generating a paging signal from another station. The main body 102 also includes an A/DvIyA device, a multiplexer, and a D/A converter inside. At this time, the main body 2 may be provided with a channel changeover switch.

The relay station 2a receives an optical signal from the optical fiber OC5 and provides a transmission signal to the optical-to-electrical converter 22, and receives an optical signal from the electric-to-optical converter 26 and outputs the optical signal. ! A21
2, headphones 201 that transmit and receive analog signals,
A main body 210 of the handset and a loudspeaker 211 that amplifies and generates an analog audio signal given to the main body 210 of the handset and receiver.
Equipped with.

The main body 210 and the loudspeaker 211 are connected, for example, by ordinary electrical wiring. The electrical signal from the main body 210 is optical.
It is converted into an optical signal by the electrical converter 24 and sent to the optical demultiplexer 213.
given to. The optical demultiplexer 213 transmits and receives the optical signal from the electrical-to-optical converter 24 (optical fiber OC6).
) is demultiplexed and applied to the optical-to-electrical converter VS25. The main body 210 is also provided with a calling switch 215 for calling a station belonging to a channel desired to be called, and a calling speaker 21G for generating a calling signal from another station.

The relay station 2b includes an optical demultiplexer 222 that demultiplexes the transmitted δ signal and the received signal, an optical-to-electrical converter 223 that converts the optical signal from the optical demultiplexer 222 into electrical 4m, and a handset body. 22
7, a headbond 221 that transmits and receives analog audio signals to and from the main body 227, an electro-optical converter 224 that converts electrical signals from the main body 227 into optical signals, and converts optical signals from the optical demultiplexer 222 into electrical signals. The optical-to-electrical converter 226 separates the transmitted signal and the received signal.

An optical demultiplexer 225 for combining is provided. An extension telephone 228 is provided outside the main body 227 to communicate with the main body 227, and the extension telephone 228 has 'if!'. Headphones 230 are provided via a protector 229 to protect against a single blow. The distance between extension telephone 228 and headphones 230 can be changed within a range of, for example, 200 meters. The handset main body 227 is also provided with a call switch 231 for calling a desired station and a call speaker 232 for generating a call signal from another station.

The return station 3 includes an optical demultiplexer 3 that demultiplexes and configures transmitted and received signals.
02, an optical-to-electrical converter 32 that converts the signal demultiplexed by the optical demultiplexer 1302 into an electrical signal, and an electric signal that converts the electrical signal from the main body 303 into an optical signal and supplies it to the optical demultiplexer 302.
A light converter 34 is provided. The main body 303 is provided with a handset 301 for transmitting and receiving analog voice signals, a call switch 310 for calling a desired station, and a call speaker 311 for generating a call number 4B from another station.

Here, each main body 102, 210, 227 and 303 includes an A/D converter, a multiplexer, a D/D converter, and a D/D converter shown in FIG.
It has a built-in A converter and a built-in battery so that it can be operated using the built-in battery.

Further, each main body may be provided with a changeover switch for changing over each channel. In this case, it is possible to call only those stations that yield to the desired channel, as in a normal telephone. It also becomes possible to make simultaneous calls between stations belonging to the same channel.

Here, only one optical fiber OC5, OC6, and OC7 is shown, but this is because they are combined into one line by a sufficient waver.

The operation is the same as that described with reference to FIG.
Broadcasting can be carried out via the relay station 1, and it is possible to notify the people belonging to the relay station 2a of the communication contents at the same time.

In addition, as in relay station 2b, if an extension telephone 228 is installed on the handset body 227 and headphones 230 are installed via a protector 229 so that it can be moved from the extension telephone 228, the site can be moved horizontally. Even people who are walking around can make calls, making it possible to accurately and quickly transmit on-site information.

When the present invention is applied to the transmission line AI line site in this way, it is possible to perform high-quality communication without increasing the miscellaneous a due to the use of digital No. 43. Also, as for the type of handset, you can use a handset, headphones, etc.)
You can choose the shape of the fish.

[Effects of the Invention] As described above, according to the present invention, communication between stations is carried out in the form of digital signals via optical transmission lines, so even if the number of connected handsets and receivers is increased, the noise generated can be reduced. It is possible to perform communication with at least one quality, and in order to communicate with digital signals, each station is divided into channels,
It is also possible to perform communication on each channel with a multiplier, which has the effect of widening the range of applications compared to the analog modulation method. That is, the present invention can be applied to power transmission Fi
l-If handsets are placed along routes where optical fibers are laid, such as roads and railways, and used for contact calls when making several calls between locations, it will be possible to achieve 1-quality communication even more effectively than before. It becomes possible to do this.

[Brief explanation of drawings]

Figure 1 shows an optical transmission type M'tF which is an embodiment of the present invention.
It is a diagram showing an example of the structure of episode J. FIG. 112 is a diagram showing an example of the configuration of the optical transmission contact telephone according to the present invention when applied to a field. FIG. 3 is a diagram showing the configuration of a conventional optical transmission contact telephone. In the figure, 1 is a terminal station, 2 is a relay station, 3 is a return station, 1
1.21.31 is the handset, 15,203.303 is A
/D converter, 18,202,206.302 is D/A converter, 16,17,201゜204.205,207,
301.304 is a multiplexer, 12.24.26.
34 is an electro-optical converter, 13.22.25.32 is an optical converter.
It is an electrical converter. , 211 is a loudspeaker, 228 is an extension f
This is a fi story. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (5)

[Claims] (1) An optical transmission contact telephone in which a plurality of handsets can communicate with each other and each handset is connected via an optical transmission line, and each of the plurality of handsets has a handset. an A/D converter that converts an analog signal from the handset into a digital signal; and an electric converter that receives the digital signal from the A/D converter, converts it into a digital optical signal, and transmits it to the optical transmission line. an optical conversion means; an optical-to-electrical conversion means for receiving a digital optical signal applied via an optical transmission line and converting it into a digital electrical signal; and an optical-to-electrical converting means for receiving a digital signal from the optical-to-electrical converting means and converting it into an analog signal. and a D/A conversion means for transmitting data to the handset. (2) Each of the plurality of intercoms is connected such that the transmission direction and the reception direction of the optical transmission line are both unidirectional, and the plurality of intercoms belong to one of the plurality of channels. and each of the plurality of telephones is divided into:
2. The optical transmission contact telephone according to claim 1, further comprising multiplexing means for multiplexing the audio signals of the plurality of channels. (3) The multiplexing means is provided in a receiving section and a transmitting section of each of the plurality of handsets, and the multiplexing means of the receiving section selects the signal of the channel to which the handset belongs and makes the call. claim 2, wherein signals of other channels are supplied to a multiplexing means provided in a transmitting section of the communication device.
Optical transmission contact telephone as described in section. (4) Each of the telephone sets is provided with an external loudspeaker that is provided outside the telephone set and amplifies the audio signal given to the telephone set, any one of claims 1 to 3. Optical transmission contact telephone listed in . (5) Each of the telephone sets is provided with a telephone set which is a master station and which is a slave station whose distance from the telephone set is variable. Optical transmission contact telephone listed in any of the above.