JPS5850662Y2 - Vehicle-to-ground video transmission equipment - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to a vehicle-to-ground video transmission system.

Previously, the applicant proposed an inter-vehicle video transmission device, which has a configuration as shown in FIG.
IC...... is each car of one train, and each car has at least one video receiver 6 (in the figure, two video receivers 6).
A, 6A', 6B, 6B', 6C.

6C'... shall be installed.

In addition, a video player 2 is installed in one of the first cars in the formation, and the pre-recorded video is output via connection lines 3A, 3B, 3C, etc. to the image receiver of each car. 6A.

6A', 6B, sB', 6C, 6d---vc
When input, information such as advertisements is supplied to passengers in each vehicle in the form of images.

Furthermore, in FIG. 1, the video signal of the video player 2 is connected in the vehicle through a connection line 3A such as a coaxial cable as a television frequency or a video intermediate frequency, and is transmitted to the receivers 6A and 6A' in the vehicle at a reception level L. While the signal is being input, transmission to the next vehicle 1B is performed not by a connecting plug but by a dedicated transmitting antenna 5A and a corresponding receiving antenna 5b.

In other words, transmitting antennas 5A, 5B, 5C on the vehicle on the transmission source side, receiving antennas 5b, 5c, etc. on the vehicle on the receiving side are installed at opposing positions between the vehicles electromagnetically. This allows for combined transmission.

At this time, there is a coupling loss (-α
), the vehicle receiving the signal uses an amplifier 4B,
4C... increases only this loss (+ct
) to obtain the required initial reception level L.

Inside the own vehicle 1B, the image receptors 6B and 6B' of the own vehicle are operated via the coaxial cable 33B as in the previous vehicle, and the transmitting antenna 5B is coupled to the receiving antenna 5C using the same principle as explained above to the lower vehicle 1C. The signals are transmitted sequentially.

In this way, a video signal is transmitted from one video player 2 to a video receiver 6 placed in another IB, IC, etc. The transmission and reception antennas 5A and 5b, 5B and 50 between the transmitting and receiving antennas are used to compensate for and amplify the coupling loss between the antennas, and the signal is sequentially transmitted to other vehicles in the group without reducing the signal level via amplifiers 4B and 4C that compensate and amplify the coupling loss between the antennas. However, each vehicle's video receiver can provide the necessary images to passengers.

Furthermore, the present applicant has improved this to provide a transmission device that performs video broadcasting between vehicles on the ground.

In order to do this, a ground transmitter 7 and a ground transmitting antenna 8 are installed on the ground as shown in Fig. 2, and the circuit configuration shown in Fig. 3 is different from that in Fig. 1. It will be added.

The present device will be explained based on the circuit diagram shown in FIG. 3, mainly the parts added to FIG. 1.

9 is a switch to switch between recording and playback modes.
Contact 13at13b of changeover switch 13.

13c and 13d are used to switch the operation of each necessary input/output, and the changeover switch contact 13a is linked.

It is assumed that the contact 13a is connected to the video player 2 via the contact 13b and the video player 2 is switched to the playback operation P and the recording operation R.

In addition to the connection from the video player 2 to the connection 3A in Figure 1, the switch 1 is connected from the antenna 5A of one vehicle.
3d, amplifier 10a demodulator 11 of receiver 10; Recording signal amplifier 12. The signal is applied from the contact S, 1 to the changeover switch contact 13c to the player 2 as a recording input signal.

On the other hand, at the station or garage, a ground transmitting antenna 8 is installed in advance so that it can face the antenna 5AK of one vehicle in close proximity, and the ground transmitter 7 connected to this is connected to the recording signal source 7at modulation. Consisting of a transmitter 7b and a transmitter 7c,
A modulated wave fl modulated by this recording signal is radiated from the antenna 8 to the antenna 5A.

”]5qitSqz is the detector 10b from the amplifier 10a of the receiver 10, and the DC amplifier 10c of the detection output.

It is a contact that works in the squelch relay SQ, which is energized by its output through the S line.

It is inserted so that the r line is opened.

This squelch relay SQ has a function that operates only when the f1 radio wave is received, and is controlled to prevent erroneous recording operation when there is no f1 radio wave.

The above is about vehicle 1A, and vehicles IB and IC
. . . are exactly the same as in Fig. 1.

In addition, from the regenerator 2, connect the connection line 3A to the image receivers 6A and 6A.
□The connection is as shown in Figure 1, connecting wire 3 to antenna 5A.
The connection from A is as shown in Figure 1, but there is a switch 13 on the way to connecting wire 3A to this antenna 5A.
A contact 13d is provided for switching connection to the antenna 5A and the video telegraph circuit.

Next, when explaining the operation of the present device, first, the playback operation P
In this case, by operating the changeover device 9, the contacts 13a, 13b-13ct13d of the changeover switch 13 can be moved to the right side in the figure, making the connection exactly the same as in Figure 1.
The operation will be omitted.

Also, when switching from playback operation P to recording operation R, changeover switch contacts 13a, 13bt 13cs 13d
To the left side of the diagram, in the vehicle 1A, operate the switch 9 to change the control mode from the playback mode P to the recording mode R It is captured and passed from the amplifier 10a to the detector 10b for DC amplification, and the relay SQ is energized to contact 5q1tSq.
Close z.

Also, the video player 2 enters the recording mode by the command line r through the contact 13a, contact Sq a *contact S9゜, and the recording input, that is, the video information signal line S, is also connected by switching the contacts 13c and 13a of the changeover switch 13. be done.

Therefore, the FL wave modulated by the recording signal from the ground transmitter 7 is transmitted from the antenna 8, captured by the antenna 5A, passed through the contact point 13d of the changeover switch 13, and received by the receiver 10, and then received by the amplifier 10a.

Detection demodulation is performed in the demodulator 11, a video information signal is taken out, amplified by the recording amplification filter 12, and transmitted from the video information signal line S to the regenerator 2 as a recording signal via the contact 13c of the contact Sq1 changeover switch 13. is input.

From the regenerator 2, there is an image receiver 6A for one vehicle. The point received at 6A', the signal transmission to the adjacent vehicle 1B via the antennas 5A and 5b, and further the signal transmission to the adjacent vehicle 1o are completely the same as those described in FIG. 1, and will not be described here.

As described above, with the present device, video information from a ground transmitter can be smoothly reproduced in each vehicle.

[Brief explanation of drawings]

Fig. 1 is a circuit configuration diagram of a vehicle video transmission device previously proposed to the applicant, Fig. 2 is a partial block diagram of the proposed device mainly for one person in a vehicle, and Fig. 3 is the circuit of Fig. 2. FIG.

Claims (2)

[Scope of utility model registration request] (1) A video player provided in one car in the formation when transmitting video signals to the image receivers 6A, 6B, etc. provided in each car IA, IB, etc. in the formation. 2 and the video recollector 2 through connection lines 3A, 3B..., and transmitting antennas 5A, 5B... Transmission antenna 5A. In order to capture radio waves from 5B..., the receiving antennas sb, 5c... installed on the next vehicle and the receiving antennas 5b, 5c... capture the radio waves. Nullifying amplifiers 4B, 4C, which compensate for radio wave losses, and connecting lines 3A,
Image receptors 6A', 6 connected via 3B...
B'... and transmitting antennas 5A, 5B, etc. for transmitting radio waves to the next vehicle, and a ground transmitter is installed at the station or garage where the vehicle stops. A ground antenna 8 is provided to allow the antenna 5A to capture video information, and switching between playback and recording operations is performed by operating the controller 9, and a video information receiver 10. Detector 11. A video transmission device between a vehicle and the ground, in which a recording amplifier 12 inputs and records a recording signal to a regenerator 2. (2) The antenna 5A is used not only as a receiving antenna for reproducing and transmitting video information between vehicles, but also as a receiving antenna for transmitting recorded video information from the ground to the vehicle, and this antenna 5A is connected to the receiver 10 and connection line 3A. A video transmission device between a vehicle and the ground according to claim 1, characterized in that a changeover switch 13 is provided for switching between the vehicles and the ground.