JPS6277788A - Tv signal transmission system and cable for transmitting tv signal - Google Patents

Abstract

PURPOSE:To perform the transmission of a TV signal having high quality by electrooptic converting the received input of a TV antenna, guiding to a TV receiver through an optical fiber and inputting a photoelectric converted electric signal to this receiver. CONSTITUTION:The terminal of an outdoor TV receiving antenna 1 is connected to an E/O converter 2 for converting an electric signal into an optical signal. A TV signal converted into an electric signal by the converter 2 enters a TV receiver 5 to reproduce a TV picture and a sound signal. To the converters 2, 4, power is supplied respectively from suitable power sources 6, 7 and the converters are respectively driven. Since the transmission path of the TV signal is constituted by optical fibers, the transmission path does not receive the induction, so that noise does not enter the TV signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a system for transmitting a TV double signal from an outdoor TV receiving antenna in each home or office to an indoor 'I'V receiver, and a transmission line that can be used therefor.

(Conventional technology) Conventionally, copper wire pairs have been used as transmission lines.

One is called a balanced type with a characteristic impedance of 300fL, and the other is a coaxial type with a characteristic impedance of 7! ;11 were common.

Transmission using these copper wire pairs was easy to handle because the terminals were simply connected to the antenna and receiver terminals, but they were susceptible to inductive interference in the transmission path and were susceptible to picking up noise. TV images were sometimes distorted.

(Problems to be Solved by the Invention) The present invention provides a new TV signal transmission system and a TV signal transmission cable that do not suffer from induction or pick up noise, in other words, solve the problems in the prior art described above. Since it does not pick up any noise, it enables the transmission of high quality TV image signals. In particular, this is in response to the technological trend that will lead to the realization of fine-grained images called high-quality 17 images in the future.

(Means for Solving the Problems) The present invention is based on the principle of connecting an outdoor receiving antenna and an indoor TV receiver with an optical fiber cable and transmitting the TV signal through the optical fiber.

Since optical fibers are not affected by electromagnetic fields in the 1A section,
Signal transmission becomes possible without being affected by induction or noise.

However, since the TV signal received by the receiving antenna is an electrical signal, a device (hereinafter abbreviated as an E10 converter) for converting this electrical signal into an optical signal is required on the antenna side.

The E10 converter converts the TV signal into an optical signal, which is transmitted through an optical fiber coupled to the E10 converter and reaches the TV receiver. Since a TV receiver consists of two electrical circuit parts, it requires a device (hereinafter abbreviated as an 0/E converter) that converts an optical signal into an electrical signal. This Q
The /E converter may be built into the TV receiver. In other words, the method of the present invention has Elo and O/E at both ends of the seven optical fibers.
The converter is connected and the electrical terminals are connected to the antenna and receiver respectively, but since Elo and O/E converters require an external power source for their operation, an appropriate power source is required for these. It also includes means for supplying. T
Since the V receiver itself receives power supply, 0/
The power supply for the E-converter can be easily extracted from the TV receiver's power supply in an appropriate manner.

The problem is the power supply for the E10 converter attached to the outdoor antenna, but this can be powered by a solar battery separately installed outdoors. In preparation for times when sunlight is not available at night, a solar battery may be used in combination with a power storage device. Another way to supply power to the E10 converter is to extract the power from the A-V receiver and connect it to the E10 converter on the antenna side.
It is possible to introduce up to 10 transducers. In this case, it is necessary to extend the pair of copper wires from the receiver to the antenna, so it is appropriate to use a cable that integrates the pair of copper wires and the optical fiber for TV signal transmission. This is another invention of the present invention.

As described above, the present invention connects an outdoor antenna and an optical fiber to an I.
10 converter, lead the optical fiber to the TIv receiver side and connect it to the T'v receiver via the 0/E converter,
The principle is that by supplying an appropriate power to each E10, 0/E converter, the rf'v signal is transmitted in the form of an optical signal through an optical fiber.

(effect) The basic configuration of the present invention is shown in FIG. 1, and its operation will be explained.

The terminal of outdoor TV receiving antenna 1 is ]'310 converter 2
The optical signal from the F10 converter is connected to the optical fiber 3
The TV signal is transmitted to the O/E converter 4, where it is converted into electricity, and then enters the TV receiver 5, where it reproduces TV images and audio.

The E10 converters 2.0/E converters 4 are each powered by a suitable power source 6.7 to drive the converters.

As can be seen from these configurations, since the TV signal transmission path is constituted by the optical fiber 3, no guidance is received in the transmission path, and therefore no noise enters the TV signal.

(Embodiment) FIG. 2 shows an embodiment of the method of the present invention, with symbols 1 and 2.
, 3, 4.5 indicate the same as in FIG.

Reference numerals 61 and 71 are power supply lines for the E10 converter and the O/E converter, respectively, and 62 represents the solar cell device. Device 6
2 may have a built-in power storage device as required. As is clear from the figure, in this embodiment, E10 on the antenna 1 side
The feature is that the power source of the converter is the solar battery device 62. On the other hand, it is convenient to take out the power source for the O/E converter 4 on the TV receiver PA5 side from the TV receiver 5.

The present invention operates with such a configuration.

FIG. 3 shows another embodiment of the method of the present invention, 1.2,
3, 4, and 5.71 indicate the same items as in FIG. 61 is the power line of the E10 converter 2, but in this case, it is characterized by being led from the TV receiver 5, and like the same 1, it is branched from the power line 71 of the 0/E converter 4. Good too.

In this case, since the optical fiber 3 and the power line 61 are parallel, the TV signal transmission cable 3 which bundles them together
It may also be set to 0. This cable constitutes another invention of the present invention, and is characterized in that copper wires/pairs and optical fibers/core are spliced. FIG. 4 shows an example of this cable.

It is shown in FIGS. 5 and 6. In FIG. 4, two copper conductors 61 and seven optical fibers 3 are arranged in parallel and integrated with a common coating 31. In FIG. 5, two copper conductors 61, 61 have a coaxial structure, and seven optical fibers 3 are embedded in an insulator 32 between them, with a coating 31 on at least one side. FIG. 6 shows a structure in which seven optical fibers 3 and two copper conductors 61 are accommodated in each groove of a plastic spacer 33 provided with a spiral groove, and a covering M31 is provided on the outermost side.

Any of the cables shown in FIGS. 4 to 6 can be used as the cable 30 of the system shown in FIG. 3 after accommodating a pair of conductors and seven optical fibers.

A special connector for handling 7 optical fibers and/or pairs of conductors is attached to both ends of these cables, and Elo, 0/
It is convenient to install it by mating it with the opposing connector attached to E.

(Effects of the Invention) Since the present invention uses a TV double signal optical fiber converted into an optical signal to transmit between an antenna and a receiver, the signal is not guided or picks up noise in the transmission path. Therefore, high quality TV signal transmission can be performed. This is believed to greatly contribute to the spread of high-quality image transmission in the future.

In addition, in optical fiber, the attenuation of optical signals is extremely small, so even if the TV receiving antenna and TV receiver are far apart, the signal will not weaken, so the method of the present invention can be applied to all environmental conditions. be.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the method of the present invention, and FIG. FIG. 3 is an explanatory diagram of different embodiments of the system of the present invention, and FIGS. 4, 5, and 6 are explanatory diagrams of different embodiments of the transmission cable of the present invention. 1...TV receiving antenna, 2...E10 converter, 3
．． ,.

Claims (1)

[Claims] 1. Connect the electric terminal of an outdoor TV reception antenna to the electric terminal of an electric-to-optical converter, couple an optical fiber to the light emitting part of the electric-to-optical converter, and connect the optical fiber to the electric terminal for TV reception. The electrical terminal of the optical-to-electrical converter is connected to the antenna circuit of the TV receiver, and the electrical terminal is connected to the antenna circuit of the TV receiver. A TV signal transmission system characterized in that power is supplied to an optical converter or an optical-to-electrical converter by an appropriate means. 2. The TV signal transmission system according to claim 1, wherein a solar cell device is used as a power source for the electric-optical converter. 3. The T according to claim 1 or 2, characterized in that the power source of the electro-optical converter is derived from a TV receiver.
V signal transmission method. 4. Connect the outdoor antenna and the optical fiber via an electrical-optical converter, lead the optical fiber to the TV receiver side, connect it to the TV receiver via the optical-electrical converter, and perform each electrical-optical conversion. It is characterized by a combination of a pair of metal conductors and an optical fiber in order to transmit the TV signal in the form of an optical signal through the optical fiber by supplying power to the optical-to-electrical converter. Transmission cable for TV signals.