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Four:two:two(4:2:2)

Audio/Video Glossary - Four:two:two(4:2:2)A term used in digital Component Video formats and interfaces. 4:2:2 states the ratio of the sampling rate of the Luminance channel (it was 4xFsc*, and is now 13.5 Ms/s) to the rate of sampling of the two Color Difference signals (it was 2xFsc each, and is now 6.75 Ms/s). Sampling the color information at lower rates is allowed due to the limited Bandwidth of color information. This is one of the formats of the CCIR 601 recommendations.