JPH01311681A - Two channel switching tv transmission system - Google Patents

Abstract

PURPOSE:To realize two channel switching TV transmission by presetting two diplexers on an arbitrary channel of one wave and another channel of one wave, and switching a four terminal RF switch. CONSTITUTION:Both TRMs(transmitters) 11 and 12 are set at a channel X, and the DPXs(diplexers) 31 and 32 are preset at the channel X and a channel Y, respectively. And a video carrier wave VC that is the output of the TRM 11 is inputted to the DPX 31 via a SW 21, and a voice carrier wave VA to the DPX 31 via a SW 22. The DPX 31 synthesizes the VC and VA, and outputs a synthesized carrier wave to a CMB(channel combiner) 41, and a first transmission system is operated as a machine in current use, and a second transmission system is waited as a spare machine. Furthermore, when broadcasting is performed on the channel Y, both the TRMs 11 and 12 are set at the channel Y, and also, the SWs 21 and 22 are switched. In such a way, it is possible to easily switch the channel, and to improve redundancy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a two-channel switching TV transmission system, and in particular, to a two-channel switching TV transmission system, in particular, switching from any one of two preset channels to another channel. The present invention relates to a two-channel switching TV transmission system for broadcasting.

[Conventional technology]

Recently, in some overseas markets, the same TV transmitter has been
There is an increasing demand for a TV transmitter that can be used by easily changing channels. This request will depend on the national circumstances of the recipient country and the circumstances of the customer, but they want to avoid mutual interference between TV broadcast waves near national borders, or to build a TV mobile transmission system as a common standby for a large number of fixed TV transmitters. It is something.

Conventionally, one TV transmitter can transmit any one of two channels.
In order to change from one wave channel to another wave channel and broadcast, the cavity used for the C/N diplexer is limited to the specified channel, so the C/N diplexer must be used for another channel. It was necessary to replace it with .

[Problem to be solved by the invention]

In the conventional TV transmission system described above, in order to perform two-channel switching transmission with one TV transmitter, the C,/N diplexer must be replaced with one for the specified channel, so channel changes must be made at the site. has the disadvantage of being technically extremely difficult.

[Means to solve the problem]

The two-channel switching TV transmission system of the present invention includes the following features: 1.
A second TV transmitter and a first one for switching the output carrier of this TV transmitter. A second 4-terminal RF switch and a first RF switch that synthesizes a video carrier wave and an audio carrier wave output from the 4-terminal RF switch. comprising a second C/N diplexer and a common antenna system that transmits the output of the C/N diplexer,
The first and second C/N diplexers are preset to a channel of an arbitrary one of the two waves and a channel of the other one wave, and the channel of the first wave is set to the channel of the other one wave. ．． The second transmitter is currently in use.

In addition to operating as a reserve, the above-mentioned 1. A second 4-terminal RF switch switches the channel of the other one wave to the channel of the first wave. It is characterized in that the second transmitter is operated as an active transmitter and a reserve transmitter, respectively.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a two-channel switching TV transmission system of the present invention.

In FIG. 1, this embodiment is a TV transmitter (hereinafter referred to as TRM)
11. - A first transmission system consisting of a 4-terminal RF switcher (hereinafter referred to as 5W) 21, a second transmission system consisting of TRM 22 and 5W 22, and a C/N diplexer (hereinafter referred to as DPX) 31.32
and a common antenna system consisting of a channel combiner (hereinafter referred to as CMB) 41 that passes the output of the DPX 31, 32, and an antenna 42. The second transmission system has a current and reserve chairman structure.

Here, S and W21.22 are switched by interlocking RF switchers as shown by solid lines, and TRMII.

12 is channel X of 1 wave of the 2 designated channels.
It is assumed that the DPXs 31 and 32 are preset to the X channel and Y channel, respectively. In this state, the video carrier wave (hereinafter referred to as VC) of the output of TRMll
is input to the DPX31 via 5W21 (solid line).

Also, the audio carrier wave (hereinafter referred to as VA) of the output of TRMII is 5W.
22 (solid line) to the DPX 31. DPX
31 combines this VC and VA and outputs it to CMB41. CMB41 has a two-man OR gate function, so DP
It is transmitted from antenna 42 through the output of X31. On the other hand, the VC and VA output from the TRM 12 are input to the DPX 32, but since the DPX 32 is preset to the Y channel, they are not output to the CMB 41. That is, the first transmission system is operated as an active device on the X channel, and the second transmission system is on standby as a standby device. It is clear that if the first transmission system fails during this operation, by switching 5W21.22 as shown by the broken line, the second transmission system becomes the active system and is operated on the X channel.

Next, when broadcasting on the other one of the two designated channels, channel Y, set both TRMII and 12 to the Y channel and switch S'W21.22 as shown by the broken line. VC is input to DPX32 via 5W21 (dashed line), and VA of TRMII is 5W.
22 (dashed line) to the DPX32,
2 is this VC and ■. are combined and output to the antenna 42 via the CMB 41. At this time, TRM12 ■. .

VA is input to the DPX31 via 5W21.22, but since the DPX31 has presellers 1 to 1 on the X channel, there is no output from the DPX31. ') Therefore, the first transmission system is operated as an active device on the Y channel, and the second transmission system is on standby as a standby device. If the first transmission system fails during this operation, by switching 5W21.22 as shown by the solid line, the second transmission system becomes the active system and is operated on the Y channel.

〔Effect of the invention〕

As explained above, in the present invention, two DPXs are preset to an arbitrary one wave channel and another one wave channel among the two specified wave channels, and 4 By switching the terminal RF switch, 2-channel switching TV transmission can be performed, which has the effect that customers can easily change channels and broadcast on the site, and the transmission system has a duplex configuration. Therefore, there is an effect of improving the hole length.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the two-channel switching TV transmission system of the present invention. 11. 12...TV transmitter (TRM), 21
, 22..., 1-terminal RF switch (sw), 31.32
...C'N guiplexer (DPX), 41...channel combiner (CMB), 42...antenna.

Claims (1)

[Claims] The first and second TV transmitters, the first and second 4-terminal RF switchers that switch the output carrier waves of the TV transmitters, and the output video carrier wave and audio carrier wave of the 4-terminal RF switcher are synthesized. The first and second C/N diplexers are provided with a common antenna system for transmitting the output of the C/N diplexers, and the first and second C/N diplexers are connected to any one of two channels. The first and second transmitters are preset to the channel of one wave and the channel of another one wave respectively, and the first and second transmitters are operated as active and backup, respectively, in this arbitrary one wave channel, and the first and second transmitters are A two-channel switching TV transmission system, characterized in that the first and second transmitters are operated as active and backup, respectively, on the other one wave channel by switching by a four-terminal RF switch.