Panasonic HVX200A Functions Guide - Page 16

2. Advantages of DVCPRO HD 2-3 DVCPRO HD's 4:2:2 Sampling Rate Is Most Beneficial for Professional Video Production Y CR CB Y CR CB Line 1 Y only Y only 4:2:2 • DVCPRO HD • DVCPRO 50 Line 2 Line 3 Line 4 DVCPRO HD and DVCPRO 50 convert video signals to digital component signals at a 4:2:2 sampling (digitizing) ratio before recording. The resulting 4:2:2 digital component signal complies with the SMPTE259 Standard SDI signal specified in ITU-R601. DVCPRO HD format samples the brightness signal (Y) at 74.25 MHz and the chroma signal (Pb/Pr) at 37.125 MHz, and combines each set of four Y samples with two Pb and two Pr samples. With the large amount of information it provides for the color difference signal, this system helps maintain outstanding color resolution. As you know, 4:2:2 sampling is one of the conditions required for source footage and interfaces used in high-end production processes such as post-production. This is because 4:2:2 sampling maintains rich colors that otherwise would be degraded in editing. Another reason is related to chroma-key composition. Because 4:2:2 sampling 13