An analog camera source first has to pass through a video decoder, and it’s just an A to D converter, which digitizes the stream for input into the Blackfin. Like a CCD sensor, it will also pass through an analog to digital converter called an AFE, or an analog front end. On the bottom, in the video display realm the Blackfin can natively send a digital stream out to something like a TFT-LCD display which accepts digital input. If it’s going to something like a CRT or some kind of TV or analog display, then it must first pass through a hardware encoder, a video encoder, which is a D to A converter.