Digital video signal switching circuit and method

Abstract

The invention discloses digital video signal switching circuit and method. The circuit comprises an external reference signal processing module, a synchronous processing and switching module, an SDI deserializing signal module A, an SDI deserializing signal module B, an INPUT1 memory, an INPUT2 memory, an MCU controller and an SDI signal serializing, converting and driving module which are integrated on the same circuit board. The method comprises the following steps of: synchronizing a digital video signal, and purely switching the digital video signal. In the invention, the synchronous processing and switching module is used for reading data in the memories according to a clock signal CLK of an external reference signal, the synchronization type required by a product and a row / field signal extracted by the external reference signal processing module by using an H / V / F signal as a reference, thus read signals are completely synchronized; and then the synchronous processing and switching module switches the signals according to a command sent by the controller MCU, thereby the signal switching is guaranteed to be complete and is free from dithering and flashing.

Description

technical field [0001] The invention relates to a digital video signal processing method, more specifically, to a digital video signal switching circuit and switching method. Background technique [0002] With the gradual deepening of the digitalization process of radio and television, there are more and more applications of digital video signals, and there are more and more related products, and the requirements for products are also getting higher and higher. Therefore, the processing and realization of digital video signals have become the key issues of product development. [0003] At present, there are many kinds of digital video signal processing products, among which there are many kinds involving signal switching, such as digital video signal matrix, switcher, special effect processing module, broadcast control equipment and some signal monitoring equipment, etc. These products will encounter a problem in the design of how to make the switching signal jitter-free an...

AI Technical Summary

Problems solved by technology

But this method is not the best solution, it increases the cost, increases the difficulty of construction and wiring, and makes the operation more complicated

[0004] It can be seen that if the switching process of digital video signals is carried out in a conventional way, either the integrity of the signal switching, no jitter, and no flickering can not be guaranteed, or it will increase the user's cost, increase the difficulty of construction and the complexity of operation

Images