JPS61247140A - Two-way catv system - Google Patents

Abstract

PURPOSE:To utilize effectively an incoming channel to other application by providing a signal inserting device in which an inserted signal is sent only toward the outgoing direction to the inlet of a desired district of a CATV distribution network. CONSTITUTION:An amplifier 11 is branched among main line amplifiers 11, 12, 13... provided to a coaxial cable 2 and a coaxial cable 3 is installed in a housing complex. A signal inserting device 4 in which the inserted signal is sent not to the incoming direction of the CATV network but toward the outgoing direction, that is, toward the housing complex side is provided at the entrance of the housing complex of the cable 3. A program from a simple studio is inserted to the insertion device 4. The program from the simple studio is sent into the housing complex through the outgoing direction of the CATV distribution network and branched into housing blocks A, B, C, D by a distribution amplifier 5. Thus, the incoming channel is utilized effectively to other applications.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a two-way CATV system.

[Conventional technology]

Conventionally, when using a two-way CATV system, for example, when performing independent broadcasting in a specific housing complex, etc., when broadcasting a program produced in that area from that area, upstream transmission lines or other transmission means such as radio are used. [Problems to be Solved by the Invention] Such conventional bidirectional OA'L'V systems are limited in transmission capacity when using uplink transmission lines, so many areas cannot be accessed at the same time. It is impossible to use a transmission line, and furthermore, when broadcasting programs unique to each region from a center, downlink channels are also allocated uniquely to each region, resulting in poor channel utilization efficiency.

[Means for resolving intermediary points]

The bidirectional CATV system of the present invention is characterized in that the inserted signal is transmitted and inserted in the upstream direction of the CTV distribution network.

In this way, the signal is not transmitted in the upstream direction of the OA'l''%' distribution network, but only in the downstream direction, so the signal can be sent only to the - area without using the uplink.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a bidirectional OA'['V system according to the present invention.

In this embodiment, a two-way CATV system is used to perform independent broadcasting from a simple studio installed in a housing complex to each building in the housing complex.

Trunk amplifier ali, 1:t provided in coaxial cable 2
, 13... Main line amplifier 1! A coaxial cable 3 is branched off and run inside the housing complex. A signal inserter 4 is installed at the entrance of the coaxial cable 3 to the housing complex to transmit the inserted signal not in the upstream direction of the CATV distribution network, but in the downstream direction, that is, on the housing complex side. The program from the simple studio is inserted into the device 4. That is, the program from the simple studio is transmitted into the housing complex through only the downstream direction of the OA'I'V distribution network, and then distributed by the distribution amplifier 5 to the AlB and O1D buildings.

〔Effect of the invention〕

As explained above, in the present invention, the inserted signal is OA'
By incorporating a signal inserter that transmits only in the downstream direction of the CATV distribution network without transmitting it in the upstream direction of the CATV distribution network, at the entrance of the designated area of the CATV distribution network, it is possible to transmit signals other than the upstream channel. It is possible to make effective use of downlink channels, and the same channel can be shared in many areas without interference, making downlink channels more effective, entertainment,
Community groups such as Ili groups can be operated only within the region.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a bidirectional OA'l'V system according to the present invention. II, ll, Ig...Main Jealousy Increase 1, 2.3.
... Coaxial cable, 4 ... Signal inserter, 5 ... Distribution multiplier.

Claims (1)

[Claims] A signal inserter is incorporated at the entrance of a desired area of the CATV distribution network so that the signal to be inserted is transmitted only in the downstream direction of the CATV distribution network without being transmitted in the upstream direction. A two-way CATV system.