JPS63232758A - Video camera system device - Google Patents

Abstract

PURPOSE:To simplify wiring between a sequential switcher and a video by connecting plural video cameras to a loop-through for the sequential switcher. CONSTITUTION:Plural video cameras 11-14 are connected to signal switching circuits 15-18 composed of respective analog switches and these switching circuits 15-18 are liked and connected to camera selecting signal receiving circuits 19-22. For a sequential switcher 23 and the video cameras 11-14, a video signal and a camera selecting signal are connected to the loop-through. When a video camera 12 is selected, a code signal to select the camera 12 from the switcher 23 is transmitted to the camera selecting signal receiving circuits 19-22. Since the above-mentioned code signal is selected and detected by a receiving circuit 20 of the camera 12, a switching circuit 16 only is switched to the video camera 12 side. As the result, the output signal of the camera 12 is inputted into a video monitor 24 through the switcher 23.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video camera system suitable for use in general surveillance applications.

Conventional technology Conventionally, this type of video camera system device c.

The structure of the pond is roughly as shown in Figure 3.

That is, in FIG. 3, 1, 2, 3, and 4 are video cameras, 5 is a sequential switcher connected to each of the video cameras 1 to 4, and 6 is a video monitor connected to the sequential switcher 5.

Next, to explain its operation, @recorded video camera 1
The images from 4 to 4 are respectively input in parallel to the sequential switcher 5.

The sequential switcher 5 converts the input video signal into one
Each address is selected automatically or manually and outputted to the video camera 6. In other words, sequential switcher 5
By this operation, video signals from the plurality of video cameras 1 to 4 can be sequentially automatically switched or manually switched.

Problems to be Solved by the Invention However, in the above-mentioned conventional video camera system device, since the images (signals) from multiple video cameras are connected in parallel to a sequential switcher, the number of wiring such as coaxial cables increases, and wiring work is required. In addition to becoming more complex and large-scale, sequential switchers must have input/output terminals corresponding to the number of video cameras connected, so sequential switchers have to become larger as the number of video cameras increases. There was a problem of not getting any.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a video camera system device that can simplify wiring work and reduce the size of a sequential switcher. There is a particular thing.

Means for solving the problems In order to achieve the above object, the invention provides a video signal line connected to a sequential switcher.

A camera selection signal receiving circuit is provided in which a plurality of video signal switching circuits, each connected to a video camera, are connected in series and connected to the video signal switching circuit to select the video camera with one selection word from the sequential switcher side. It was established.

According to the present invention, with the above-mentioned configuration, loop-through connections can be made between each video camera and between each video camera and a sequential switcher, so the wiring between each video camera and a sequential switcher can be made into a B element, and the wiring work can be simplified. Simplification and miniaturization of the sequencer/LA switcher can be realized.

Embodiment FIG. 1 is a block diagram showing a schematic configuration of a video camera system device which is an embodiment of the invention.

In FIG. 1, 11.12 and 13.14 are video cameras, and each of these video cameras 11 to 14 has video signal switching circuits 15 and 16.1 each consisting of an analog switch.
7.18 is connected.

Further, the video signal switching circuits 15 to 18 are connected to camera selection signal receiving circuits 19.20 and 21.22, respectively.

Reference numeral 23 denotes a sequential switcher, and the video signals and camera selection signals (code signals) are connected to the sequential switcher and the video cameras 11 to 14 through a J-rep connection. 24 is sequential switcher 2
This is a video monitor connected to 3.

FIG. 2 is a block diagram showing in more detail the relationship among the video signal switching circuit 15, camera selection signal receiving circuit 19, and sequential switcher 23 shown in FIG.

As shown in FIG. 2, the camera selection signal receiving circuit 19
Serial-parallel conversion circuit 25. ! : comprises a camera code setting circuit 26 and a digital comparison circuit 27, and this digital comparison circuit 27 receives an 8-bit digital /L' signal from the serial-parallel conversion circuit 25 and the camera code setting circuit 26. In response to this, the video signal switching circuit 15 is switched.

Further, the sequential switcher 23 includes a selector 231 for selecting one of the video cameras 11 to 14 and a camera selection signal generation circuit 232.

The operation of the apparatus shown in FIG. 1 will be explained below.

First, different camera codes are set in advance in the camera code setting circuits 26 of the respective camera selection signal receiving circuits 19 to 22.

Therefore, a case will be described below, taking as an example a case in which the video camera 12 is to be selected.

When the video camera 12 is selected via the selector 231 of the digital switcher 23, a camera selection signal (code signal of the video camera 12) is sent from the camera selection signal generation circuit 232 to each camera selection signal reception circuit 19-22. Sent.

In each camera selection signal receiving circuit 19 to 22, the serial
The parallel conversion circuit 25 converts the @-marked camera selection signal into 8-bit code data, and the digital comparison circuit 27 compares this code data with the code data set in the camera code setting circuit 26.

In this example, only the camera selection signal receiving circuit 20 has the same code data, so the digital comparison circuit 27 of the camera selection signal receiving circuit 20 switches the video signal switching circuit 16, and the video signal Only the switching circuit 16 sends the video signal of the video camera 12 to the sequential switcher 23.

The above is an explanation of the case where the video signals (Φ signals) of the video cameras 11 to 14 are manually switched and selected, but the sequential switcher also applies to the case of automatically switching and selecting the video signals of the video cameras 11 to 14. 2
This can be achieved by simply sequentially automatically switching and transmitting the camera selection signals from the camera selection signal generation circuit 232 of No. 3.

In this way, according to the above embodiment, the sequential switcher 23 and each of the video cameras 11 to 14 can be connected in a loop-through manner, so even if a large number of video cameras are connected,
The number of wires does not increase, simplifying the wiring work and downsizing the sequential switcher 23.

Effects of the Invention As is clear from the above embodiments, the present invention connects a plurality of video cameras to a sequential switcher through loop-through, so even if the number of video cameras increases, the sequencer/l /Wiring to the switcher does not become complicated or bulky, and wiring work can be simplified or simplified.

Furthermore, since the input/output terminals of the sequential switcher are independent of the number of video cameras connected, the sequential switcher can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a video camera system device which is an embodiment of the present invention, FIG. 2 is a block diagram showing a specific purchase of the main circuitry of FIG. 1, and FIG. 1 is a block diagram showing a schematic configuration of a video camera system device of FIG. 11-14...Video camera, 15-18...
...Episode (ψ signal switching circuit, 19-22...
Camera selection signal receiver, 23...Sequential switcher. 24...Video motor.

Claims (1)

[Claims] For the video signal line connected to the sequential switcher,
A camera selection signal receiving circuit is provided in which a plurality of video signal switching circuits each connected to a video camera are connected in series and connected to the video signal switching circuit to select the video camera using a selection signal from a sequential switcher side. A video camera system device characterized by: