JPH05260218A - Simultaneous transmission system for telephone signal and television signal - Google Patents

Abstract

PURPOSE:To provide a simultaneous transmission system for a telephone signal and a television signal for which the number of outlets is reduced, the wiring is simplified and the television signal is sent in a proper state at all times even in a district where the reception state of a radio wave is not excellent. CONSTITUTION:A drawing optical fiber cable 12 connected to an optical fiber cable 11 through which a telephone signal and a television signal are sent as an optical signal is connected to a converter 14 converting an optical signal into an electric signal or vice versa installed in a building 13. The outlet 16 provided on the building 13 is connected to the converter 14 via a coaxial cable 15. The outlet 16 is connected to a TV.TEL branching device 18 via a cable 17 and a telephone set 22 and a television receiver 26 are connected to the TV.TEL branching device 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous telephone signal and television signal transmission system using an optical fiber cable.

[0002]

2. Description of the Related Art Conventionally, a two-core telephone line has been used as a service line of a telephone, and an optical fiber cable is only partially used between exchanges. Further, as a conventional technique relating to an optical fiber cable, as disclosed in Japanese Patent Laid-Open No. 53-130045, by accommodating completely different kinds of optical transmission fibers in the same optical cable, various types of optical cables can be used. There are some which are designed to transmit signals simultaneously. In addition, television signals for television are transmitted by radio waves or other wires. By the way, in recent years, a telephone and a television are becoming owned by each individual. Therefore, it is increasing to arrange a large number of telephone outlets and television receiving outlets in one building.

[0003]

However, when arranging telephone outlets and television receiving outlets in a large number of rooms, there is a problem that the number of outlets increases and wiring becomes complicated. In addition, when a television signal is transmitted by radio waves, there is a problem that the television image and audio state deteriorate in an area where reception is poor. The present invention has been made in view of the above-mentioned conventional problems, and it is possible to reduce the number of outlets, simplify the wiring, and keep the television signal always in a proper state even in an area where the reception state of radio waves is poor. An object is to provide a simultaneous transmission system for telephone signals and television signals that can be transmitted.

[0004]

According to the invention of claim 1, an optical signal transmitting means for transmitting a telephone signal and a television signal as an optical signal, and a telephone signal and a television signal transmitted from the optical signal transmitting means. An optical fiber cable for transmitting a signal, a converter connected to the optical fiber cable for converting an optical signal to an electric signal and an electric signal to an optical signal, and a telephone and a television user's building connected to the converter A TV equipped with an outlet and a function connected to the outlet for demultiplexing an electric signal into a telephone signal and a television signal, which can be connected to a telephone and a television.
A telephone signal comprising a TEL demultiplexer and a telephone signal receiving means for receiving a telephone signal transmitted from the telephone by way of the TV / TEL demultiplexer, outlet, converter and transmitted by the optical fiber cable, and It is a simultaneous signal transmission system for TV.

[0005]

In the present invention, the telephone signal and the television signal are transmitted as optical signals by the optical signal transmitting means, and the optical signals are transmitted by the optical fiber cable. The optical signal transmitted by the optical fiber cable is converted into an electric signal by the converter, the electric signal passes through the outlet, and is demultiplexed into a telephone signal and a television signal by the TV / TEL demultiplexer. In addition, telephone signals such as ringing signals transmitted from the telephone are TV / TEL demultiplexer,
After passing through the outlet and the converter, it is transmitted by the optical fiber cable and received by the telephone signal receiving means.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a telephone signal and television signal simultaneous transmission system according to an embodiment of the present invention. In the figure, reference numeral 1 indicates a telephone station, and the telephone station 1 is provided with a terminal station 2. A telephone signal and a television signal transmitted from the television station 10 are input to the terminal station 2. Telephone office 1
A laser device 3 and an optical modulator 4 for modulating the pulse width of laser light are provided. The terminal 2, the laser device 3, and the optical modulator 4 constitute an optical signal transmitting means 6. Further, the telephone station 1 is provided with a telephone signal receiving means 5.

Reference numeral 11 indicates an optical fiber cable, and the optical fiber cable 11 is connected to the optical modulator 4. The optical fiber cable 11 is also connected to the telephone signal receiving means 5. An optical fiber cable 12 for pulling in is connected to an intermediate part of the optical fiber cable 11,
This drop-in fiber optic cable 12 is dropped into a building 13 for telephone and television users. Inside the building 13, there is provided a converter 14 for converting an optical signal into an electric signal and an electric signal into an optical signal, and the pull-in optical fiber cable 12 is connected to the converter 14.

Reference numeral 16 indicates an outlet, which is installed in five rooms of the building 13. Outlet 16
Is connected to the converter 14 via a coaxial cable 15. The converter 14 is installed in the attic of the building 13 or the like. One end of a cable 17 is connected to the outlet 16, and the other end of the cable 17 is connected to the TV / TEL demultiplexer 18
It is connected to the.

As shown in the enlarged view of FIG. 2, the TV / TEL demultiplexer 18 is provided with a telephone terminal 19 and a television terminal 20. A telephone 22 is connected to the telephone terminal 19 via a two-core cable 21. Also terminal 2 for TV
A UV demultiplexer 24 is connected to 0 via a cable 23, and the UV demultiplexer 24 is connected to a television 26 via a cable 25. In this way, since one outlet 16 is used for both the telephone and the TV, the number of outlets can be halved compared to the case where the telephone and the TV are separately provided in the related art. Like Along with this, the wiring can be simplified.

Next, the transmission operation of the telephone signal and the television signal in the telephone signal and television signal simultaneous transmission system will be described. The telephone signal is input to the terminal station 2 of the telephone station 1, and the television signal is input from the television station 10 to the terminal station 2. The laser light emitted from the laser device 3 is modulated by the optical modulator 4 in accordance with the telephone signal and the television signal, and the telephone signal and the television signal are sent to the optical fiber cable 11 as an optical signal.

The optical signal passes through the optical fiber cable 11 and the pull-in optical fiber cable 12 and is transmitted to the converter 14, which converts the optical signal into an electric signal. And this electric signal is sent to the outlet 16,
Further, the electric signal is transmitted to the TV / TEL demultiplexer 18 and demultiplexed into a telephone signal and a television signal. The telephone signal is output from the telephone terminal 19 and sent to the telephone 22 via the two-core cable 21. Further, the television signal is output from the television terminal 20 and sent to the television 26 via the cable 23, the UV demultiplexer 24, and the cable 25.

As described above, since the television signal is transmitted to the television 26 by the optical fiber cable 11 or the like, the television signal can always be sent to the television 26 in an appropriate state even in an area where the reception of radio waves is poor. become able to. The call signal from the telephone 22 is converted by the converter 1
The signal is converted into an optical signal by 4 and is transmitted to the telephone signal receiving means 5 of the telephone station 1 through the optical fiber cable 12 for pulling in and the optical fiber cable 11.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the present invention can be applied even if there is a change in design within the scope not departing from the gist of the present invention. Included in the invention. For example, the optical modulator 4 modulates the pulse width of the laser light, but it may also modulate the frequency or wavelength, and also has the function of modulating two or more of the pulse width, frequency and wavelength. It may be.

[0014]

As described above, according to the present invention, the number of outlets for telephone signals and television signals can be reduced, and wiring can be simplified. Moreover, it becomes possible to always transmit the television signal in an appropriate state even in an area where the reception of radio waves is poor.

[Brief description of drawings]

FIG. 1 is a diagram showing a telephone signal and television signal simultaneous transmission system according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

 1 Telephone Station 2 Terminal Station 3 Laser Device 4 Optical Modulator 5 Telephone Signal Receiving Means 6 Optical Signal Sending Means 10 TV Station 11 Optical Fiber Cable 12 Optical Fiber Cable for Service 13 Telephone and Television User's Building 14 Converter 16 Outlet 18 TV / TEL duplexer 22 Telephone 26 Television

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Claims (1)

[Claims] 1. An optical signal transmitting means for transmitting a telephone signal and a television signal as optical signals, an optical fiber cable for transmitting a telephone signal and a television signal transmitted from the optical signal transmitting means, and the optical signal. A converter connected to a fiber cable for converting an optical signal into an electric signal and an electric signal into an optical signal, an outlet connected to the converter and provided in a building of a telephone and a television user, and connected to the outlet A TV / TEL demultiplexer that has the function of demultiplexing an electric signal into a telephone signal and a television signal, and that can be connected to a telephone and a television, and a TV / TEL demultiplexer and an outlet transmitted from the telephone , A telephone signal receiving means for receiving a telephone signal transmitted by an optical fiber cable through a converter, and a telephone signal and a television signal simultaneous transmission. System.