4:2:2 format serialization
Digital video signal

The bitstream of the 4:2:2 standard is an 8-bit wordstream whose bitrate is calculated as follows:

• for luminance: 13.5 MHz over 8 bits, i.e. 13.5 × 8 = 108 MHz ;

• for each C_R and C_B component: 6.75 MHz over 8 bits, i.e. 6.75 × 8 = 54 MHz.

After multiplexing the information, this results in an 8-bit bit stream at 27 MHz, giving a digital data rate of 216 Mbit/s.

To transport it serially on a single medium, spectral shaping must be ensured by additional synchronization coding, and clock recovery must be enabled. The CCIR recommended 9-bit coding, giving a data rate of 243 Mbit/s, while the Japanese produced equipment with 10-bit coding, giving 270 Mbit/s. Now that this equipment has been commercialized, it is the coding that has been retained.

This data rate is far too high to fit into one of the standardized...