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Terms and Glossary

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480i

Type of standard digital television (SDTV) image that is 480 lines by 720 pixels wide, displayed in interlaced format. (It has a 4:3 or 16:9 aspect ratio, 29.97-Hz frame rate, as defined by the ATSC standard.)

480p

High-definition television (HDTV) image that is 480 vertical lines by 720 horizontal pixels displayed in progressive format (It has a 4:3 or 16:9 aspect ratio, 59.94 Hz, 29.97 Hz, and 23.98 Hz frame rates, as defined by the ATSC standard.)

4:1:1

A set of sampling frequencies in the ratio 4:1:1, used to digitize the luminance and colour difference components (Y,R-Y,B-Y) of a video signal. Used in PAL DVCPRO recording.

4:2:0

A set of sampling frequencies in the ratio 4:2:0, used to digitise the luminance and colour difference components (Y,R-Y,B-Y) of a video signal. Used in PAL DVCAM recording.

4:2:2

A commonly used term for a component digital video format. The details of the format are specified in the ITU-R601 standard. The numerals 4:2:2 denote the ratio of the sampling frequencies of the luminance channel to the two colour difference channels. For every four luminance samples, there are two samples of each colour difference channel

4:4:4

A commonly used term for a high resolution component digital video format. The numerals 4:4:4 denote the ratio of the sampling frequencies of the luminance channel to the two colour difference channels. For every four luminance samples, there are four samples of each colour difference channel. 4:4:4 sampled signals are also available in a RGB format with equal sampling rates for each of the colour channels. These signals are commonly carried on a pair of coax cables according to the SMPTE 372M standard

4Fsc

A commonly used term for a composite digital video format. The details of the format are specified in the ITU-R601 standard. The numerals 4Fsc denote that the sampling frequency is 4 times the colour subcarrier frequency (approximately 14.3 MHz for NTSC and 17.7 MHz for PAL)

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