JPS6223246A - Supervisory system - Google Patents

Abstract

PURPOSE:To improve the supervisory efficiency and the recording efficiency and to attain low cost by applying time division multiplex to a camera control signal and a camera synchronizing signal so as to send the result thereby simplifying the system constitution for the synchronization of a camera. CONSTITUTION:A parallel/series converter 5 inputs an output of a latch element 3 and a camera synchronizing signal VD, applied time division multiplex to obtain a series signal S with respect to a frame pulse. Since the serial signal S is sent to each supervisory region C through an optical fiber, an E/O converter 6 is provided at the sending side and an O/E converter 7 is provided at the reception side. A serial/parallel converter 8 inputs the serial signal S to establish the frame synchronization and then recovers the camera control signal and the camera synchronizing signal VD. When the camera synchronizing signal VD is inputted to a supervisory camera 9, a video signal (v) phase-locked to the camera synchronizing signal is obtained. Since the video signal (v) is sent to a centralized supervisory section A through the optical fiber, an E/O converter 10 and an O/E converter 11 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a monitoring system featuring supervisory control of distributed areas.

Conventional technology For example, monitoring and control of supermarket/department store sales floors and inside buildings uses vertical, horizontal, zoom, focus, and
Surveillance cameras that can control the iris, etc. are arranged in each surveillance area as shown in Figure 6, and camera control signals (SW1-1
0) is time-division multiplexed by a parallel/serial converter 5 and transmitted as a serial signal S through an optical fiber. Furthermore, in the monitoring area, the serial signal S is converted into the original parallel signal to drive the monitoring camera 9. The video signal V of the surveillance camera 9 is transmitted to the central monitoring department personnel through an optical fiber, and the video signal of the surveillance camera is switched by the video signal selector 12, and the image is received or recorded by the receiver (TV) or VTR of the monitor block 13. are doing.

Problems to be Solved by the Invention However, in the conventional configuration described above, the phases of the video signals V of the surveillance camera 9 are different from each other as shown in FIG. V)
Since vertical synchronization pull-in time is required, a vertical retrace line appears on the screen for several frames as shown in FIG. 7, reducing monitoring efficiency and recording efficiency.

In order to improve such a problem, synchronization is attempted by giving, for example, a vertical synchronization signal to each surveillance camera 9. As a means of synchronization, a synchronization signal generator 4 is provided as shown in FIG. 8 to synchronize each surveillance camera.
The need to transmit synchronization signals individually complicates the system configuration and increases costs.

In view of the above problems, the present invention enables synchronization of each surveillance camera by multiplexing transmission of camera control signals and camera synchronization signals, improves surveillance efficiency and recording efficiency, and simplifies the system configuration to reduce costs. The purpose is to provide a monitoring system that can

Means for Solving the Problems In order to solve the above problems, the present invention provides means for time-division multiplex transmission of camera control signals and camera synchronization signals, means for multiplexing and demultiplexing camera control signals and camera synchronization signals, A plurality of surveillance cameras are operated synchronously by providing a transmission means for collecting the video signals of the cameras at one point and a means for selectively receiving or recording each video.

According to the above-described configuration, the present invention simplifies the system and improves monitoring efficiency and recording efficiency by multiplexing camera control signals and camera synchronization signals through the same transmission path and synchronizing operation of surveillance cameras. .

Embodiment FIG. 1 is a block diagram showing an embodiment of the monitoring system of the present invention. In Figure 1, person is a centralized monitoring unit, B is a transmission unit made up of optical fibers, C is a distributed monitoring unit made up of multiple monitoring areas, and 1 is a first switch element that issues camera control commands. 2 is a second switch element group that specifies a monitoring area; 3 is a latch element that samples ON/OFF information of the first switch element only for the monitoring area specified by the ON information of the second switch element; 4 is a synchronization signal generator that generates a vertical synchronization signal, 5 is a parallel/serial converter that time-division multiplexes the output of the latch element 3 and the vertical synchronization signal, and 6 and 1o are electrical/optical signal converters (hereinafter E/ (referred to as O converter), 7 and 11
is an optical/electrical signal converter (hereinafter referred to as 0/E converter), 8
1 is a serial/parallel converter that multiplexes and separates camera control signals and camera synchronization signals, 9 is a surveillance camera, and 12 is a video signal input from each surveillance camera to output the video signal specified by the ON information of the second switch element. Video signal selector to select, 1
Reference numeral 3 denotes a monitor block consisting of a television receiver (TV) and a VTR that receive or record the video signal selected by the video signal selector 12. The following description will be made assuming that there are three systems in the monitoring area. The first switch element group 1 (SW1 to SW1o) drives the surveillance camera 9, and corresponding to the table below, each arrow latch element 3 in FIG.
) 2 ON information channel only operates, and the sampling pulse l causes the first switch elements (SW1 to
1o) is sampled, but input is rejected for channels where the second switch element group (CHI to CH3) is off. Parallel/serial converter 5
inputs the output of the latch element 3 and the camera synchronization signal VD, and as shown in FIG. 3, obtains a serial signal S by time-division multiplexing with reference to the frame pulse. Since the serial signal S is transmitted to each monitoring area C by an optical fiber, an E10 converter 8 is provided on the transmitting side, and an O/E converter 7 is provided on the receiving side.

The serial/parallel converter 8 inputs the serial signal S to establish frame synchronization, and then converts the camera control signal and camera synchronization signal VD.
When the zero-power camera synchronization signal vn for reproducing is inputted to the surveillance camera 9, a video signal V whose phase is synchronized with the camera synchronization signal is obtained as shown in FIG. Therefore, E10 converter 1o
The video signal V transmitted to the central monitoring unit equipped with a converter 11 at and O/ is input to the video signal selector 12, and the video signal designated by the second switch element group (CH1 to CH10) is input to the video signal selector 12. is selected and the monitor block 13 receiver (T
Effects of the Invention According to the present invention, by time-division multiplexing and transmitting camera control signals and camera synchronization signals, the system configuration can be simplified and camera synchronization can be achieved. As a result, monitoring efficiency and recording efficiency can be improved, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a surveillance system in an embodiment of the present invention, FIG. 2 is an external view showing the operation of a surveillance camera, FIG. 3 is a frame configuration diagram of time division multiplexing, and FIG. 4 is a camera diagram. Figure 5 is a block diagram showing the configuration of the conventional example, Figure 6 is a time chart showing the operation of the conventional example, Figure 7 is a screen diagram of the receiver, and Figure 8 is a diagram of the camera. This is a block diagram showing an example of a conventional improvement for achieving synchronization. A: Central monitoring section, B: Transmission section, C
... Distributed monitoring unit 1 ... First switch element group, 2 ...
Second switch element group, 3... Latch element, 4
...Synchronization signal generator, 6...Parallel/serial converter, 8...Series/parallel converter, 9...
... Surveillance camera, 12... Video signal selector,
13...Monitor block. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 9 --- Humera Figure 3

Claims (2)

[Claims] (1) The first monitoring area has multiple monitoring areas and controls the camera's horizontal, vertical, zoom, focus, iris, etc.
a second switch element group that specifies a monitoring area; and a latch element group that samples on/off information of the first switch element only for the monitoring area specified by the on information of the second switch. It is equipped with a synchronization signal generator that generates a vertical synchronization signal, and an internal oscillation circuit, which generates sampling pulses, inputs the output data of the latch element group and the vertical synchronization signal, and time-division multiplexes the data into serial data. a first electrical/optical signal converter group that converts serial data into an optical signal;
a first optical/electrical signal converter group that is connected to the first electrical/optical signal converter group by a first optical fiber group and converts an optical signal into an electrical signal; and a first optical/electrical signal converter group. A group of serial/parallel converters converts the output serial data into parallel signals, and horizontal, vertical,
A group of surveillance cameras that perform required operations such as zoom, focus, and iris, and output video signals based on a vertical synchronization signal; a second group of electrical/optical signal converters that convert video signals into optical signals; a second optical/electrical signal converter group that is connected to a second electrical/optical signal converter group by a second optical fiber group and converts an optical signal into an electrical signal;
A video signal selector that inputs the output signals of the electrical signal converters and selects and outputs the corresponding video signal based on the on information of the second switch, and a monitor that records or plays back the output signal of the video signal selector.・A monitoring system equipped with a block. (2) The first and second switch element groups, the latch element group, the synchronizing signal generator, the parallel-to-serial converter group, and the first
a group of electrical/optical signal converters, a second group of optical/electrical signal converters, a video signal selector, a central monitoring section consisting of a monitor block, and a transmission section consisting of first and second optical fiber groups. , a first optical/electrical signal converter group, a serial/parallel converter group, a surveillance camera group, and a second electrical/optical signal converter group. The monitoring system described in paragraph 1.