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.
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