SIGGRAPH 97 Video Formats Sampling, Quantizing & Filtering Sampling is the process by which some continuous variable is measured at discrete intervals. inadequate sampling results in aliasing Quantizing is the definiton given to the voltage scale or gamut 8 bit sampling allows for 256 intervals (D1) 10 bit sampling allows for 1024 intervals Filtering To convert analog to digital and digital to analog a number of filters are applied Filtering deserves it's own slide

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Composite digital video uses a sampling rate that is four times the rate of the subcarrier. This makes the extraction of the color difference easier. The sampling rate for NTSC is about 14.3 Mhz. Composite digital does not encode sync, but rather recreates it on playback.

Digital component samples differently than digital composite. A common rate is used for both NTSC and PAL signals. This means the length of the individual lines (720) is slightly longer than NTSC. The sampling rate is 13.5MHz. This rate will become more important later.

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