A video signal accurate control method

Abstract

This invention relates to a method for accurately controlling video signals. The present broadcast control system is set up under non real-time time-sharing operation system, which cannot ensure the real time of the control to devices. A broadcast system often involves in multiple kinds of devices with great difference, control delay happens very often and the technology often applies configuration or even hard encode method, the control logic is complicated, information communication mode is often applied, yet it is non real time. This invented method realizes accurate control of video signals combining the ways of device sequence prediction to diagram, multiple task management, high accuracy clock and field return synchronization.

Description

technical field [0001] The invention belongs to the technical field of radio and television broadcast control systems, and in particular relates to a method for precise control of video signals. Background technique [0002] The digital broadcast control system of radio and television is mainly used to support the broadcasting business process of the TV station. It is one of the core application systems of the TV station. Its main functions are: according to the pre-compiled program list, remote control of various video and audio equipment, timely and accurate Reliably get the show out there. The so-called accurate timing means that the TV signal is played accurately from the specified screen at a given time point at 25 frames per second. It is not allowed to make mistakes in the control time point, and there cannot be more or less frames, that is, it is necessary to accurately grasp the control command. The timing should not exceed 1 frame (40 milliseconds) before and afte...

AI Technical Summary

Problems solved by technology

[0004] The broadcast control system is a real-time control system, and the instructions issued by it to control the equipment must be within the error range of 1 frame (40 milliseconds) at a given point in time. However, the broadcast control system is built under a non-real-time time-sharing operating system. Various devices are controlled under a time-sharing operating system, so real-time performance cannot be guaranteed; at the same time, the broadcast control system involves various types, brands, and models of devices, and these devices have great differences in control methods and execution characteristics. Differences, device control delays often occur. In the prior art, configuration or even hard-coding methods are usually used to solve the problem of device control delays. However, the control logic of this method is complex and error-prone; moreover, multiple (types) of devices are often required to complete a business. Collaborative work, these devices usually use the method of message communication to work together, but the message is not real-time, the processing is scattered, the efficiency is low, and the control is often inaccurate, so it is very challenging to achieve precise control of the video signal frame

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