abstract

With the development of digital TV in China, the number of broadcast channels of TV stations will increase. The use of high technology to monitor the broadcast signal of the TV network in real time has important practical significance for strengthening central control, purifying the screen and improving the reception quality and preventing abnormal interference. Therefore, the traditional TV monitoring system has been unable to adapt to the needs of channel proliferation and technology development. The demand for broadcast quality monitoring and content monitoring is becoming more and more urgent. The method of manually monitoring the duty is greatly affected by the on-duty personnel. It is difficult for the duty officer to ensure real-time control of all the broadcast links during the duty process, which not only wastes a lot of manpower. Resources, and it is difficult to respond in time when there is an off-air or inferior broadcast accident, and it is more difficult to ensure that faults are handled accurately and in a timely manner. Therefore, in today's rapid development of monitoring technology in the broadcasting industry, the use of fully automated, fully digital TV station automatic duty system has become an alternative to traditional manual duty.

The main purpose of the monitoring of small TV stations is to monitor the content of self-run programs, CCTV, provincial stations and other broadcast channels, to understand the broadcast situation in real time, and to play back the content of the program afterwards to achieve the broadcast of the program. Surveillance, and broadcast of accidents.

The fully automated TV monitoring system is an emerging radio and television equipment in recent years. Although it is rich in functions and high in integration, its price is not high. For small TV stations, many functions are too redundant.

By analyzing the principle of the fully automated TV monitoring system, the component modules, structural framework, and operational processes are further obtained. According to some existing equipment on the market, a fully automated TV monitoring system that is both economical and practical is designed.

1. System principle

Fully automated TV monitoring and broadcasting system consists of video and audio monitoring, video and audio collection, compression, display, audio and video intelligent recognition engine, large-capacity audio and video storage related hardware and system operation, monitoring, query, browsing software and other modules. The system is based on the B/S architecture, and the entire software only needs to be installed on the server to provide services. It integrates video recording, multi-screen display, intelligent recognition processing, TV signal monitoring and alarm control. The system can record 30-day TV programs on multiple channels at the same time for 24 hours, and retrieve the recorded TV program content through web browsing.

2. Composition module

1. Video and audio real-time monitoring and alarm printing module.

2. Video and audio real-time acquisition module.

System design

(1) Video and audio real-time monitoring and alarm printing

Video and audio real-time monitoring equipment, using DGN-16 signal monitor, it has the following characteristics:

Figure 1 DGN-16 monitor work flow chart

The DGN Series Signal Monitor is an intelligent multi-channel monitoring device. Multiple channels of video and audio signals can be

Intuitive color bars are displayed on the screen to monitor the operation of each signal. This product is suitable for wide

Video and audio monitoring such as broadcasting stations, cable television stations, transmission centers, plug-in stations, and transmitting stations.

The DGN-16 monitor can visually display 16 channels of audio and video signals in the form of color bars on the monitor screen.

Up, you can monitor 8 sets of TV programs or 16 channels of radio programs.

The performance characteristics are as follows:

1. Qualitative monitoring of each input signal, the display signal is displayed in color bar mode, available on the screen

Monitor it.

2. The screen has a signal amplitude horizontal line, and the adjacent color bars are distinguished by different colors.

3. There are warning lights and clocks at the top of the screen. Built-in clock battery, the clock runs normally when power is off.

4. The signal is interrupted for 10 seconds, the buzzer will alarm, the alarm light will be on, and the broadcast will be printed immediately.

Time and resume broadcast time, and there is a warning control signal output.

It can be seen from these characteristics that the DGN-16 signal monitor can fully assume full automation.

Visual and audio real-time monitoring and alarm printing of the monitoring and broadcasting system.

(2) Video and audio real-time acquisition module

The video and audio real-time acquisition module is a large-capacity hard disk recording system, a hard disk recording system capable of recording multiple channels of video and audio signals at regular intervals. The selected AV monitor card is configured as follows:

1. The card is a single-channel and multi-channel video PCI video card. It has low CPU usage and multiple real-time displays. Compressed using the software MPEG-4 compression engine, the dynamic image stored in the image channel can be captured as a JPG still image.

2. Using the super strong Philips 7134 chip. Its unique 4-wire 3D comb filter automatically eliminates noise and improves image quality. The chip itself integrates the functions of audio and video capture. Support Overlay multi-channel simultaneous preview, extremely low CPU usage. Provides MPEG-4 compression engine for scheduled fixed-length compression recording of multi-channel video and audio images.

The video and audio real-time monitoring software GUARD4000 attached to the video and audio monitoring card can meet the requirements of multi-channel video and audio monitoring or other video streaming. It can perform MPEG-4 compression in real time and select to store it as an AVI file. GUARD4000 has functions such as digital video recording, network transmission, dynamic detection, alarm input and output, playback file and system management, and supports web browsing. Multiple video and audio cards can be inserted simultaneously on the same computer, and the software can support up to 24 channels of video and audio.

Multi-channel real-time 24-channel frame-down compression processing, each channel can operate independently without interference, no loss of synchronization, less memory space, independent intelligent recording, support playback during recording, browsing video through IE browser anytime, anywhere Audio stream.

Figure 2 TV signal system structure

4. Structure and process

As shown in Figure 2 (Note: The antenna refers to the indoor and outdoor TV signal receiving antenna, which can receive the wireless mode.

Quasi-signal; video recorder demodulates video and audio signals).

V. Characteristics of setting up a fully automated TV monitoring and broadcasting system

The multi-channel monitoring station provides two kinds of RF signals and analog digital video and audio signals for network back monitoring.

Video access method.

A columnar color bar that simultaneously displays the signal state. Support real-time audible alarm and alarm status printing.

The main features are as follows:

1. High stability, high reliability, and large-capacity redundant power supply.

2. High resolution, clear image, brightness, contrast, chroma, saturation of any program

Can be adjusted individually.

3. You can create an edit delete image window arbitrarily, use the mouse to drag the window position and large

Small; save and load layouts at will; create clocks and texts at will; customize window mode and parameter settings

Can be stored and called.

4.PPM audio monitoring: each image corresponds to stereo (two-channel) input, which can control two independently

The switch of the PPM meter.

5. Video, audio loss alarm, audio over level alarm.

6. There are various alarm modes such as sound reminder and fault printing on the fault channel.

7. Remote control and configuration via the network.

8. Can accept RF, SDI digital video input, CVBS analog video input, etc.

9. Up to 8 channels of video and 16 channels of audio input.

10. Video and audio loss, video still frame, black field monitoring, accurate alarm, no false negatives.

11. Set the timed automatic recording according to the time period, and reliably record the TV during the time period or when the fault occurs.

The broadcast status of the program, truly recording the status before and after the failure occurred.

12. The color volume indicator bar that changes in real time is superimposed on the edge of the screen to dynamically display the volume.

13. Centralized control and networked management.

Summary

Through the absorption, digestion, combination, innovation and transformation of the multi-channel real-time hard disk recording technology in the AV signal monitor and the security monitoring equipment in the radio and television equipment, the video and audio signal monitor and security in the radio and television equipment will be creatively realized. The combination of multi-channel real-time hard disk recording system of monitoring equipment, developed a TV signal monitoring system that conforms to its actual situation, so that the fully automated TV monitoring and broadcasting system is not limited to those large manufacturers, which can improve the technical level of the technical department and save large Pen funds.

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