Capture card is mainly to capture the external photoelectricity, video, audio and other analog signals and digitally imported into the computer for digital processing of the capture device, the main use of the image capture card, video capture card, audio capture card (such as sound card), data acquisition card.
Video capture device - video capture card is our video processing essential hardware devices, through which we can be captured by the video camera video signal from the camera tape to the computer.
Principle?
In the transmission processing of video signals, it is necessary to video capture card to help, because the general video camera video signals are analog, continuous signals, while the computer only recognizes digital signals (discrete signals), because the computer is using binary encoding, therefore, it will require a can be analog video signal acquisition to the computer, and in the acquisition of video signal acquisition there are considerations Speed, conversion between analog and digital signals, video signal quality and other issues. This requires a video capture card to help.