An 8-bit composite digital videotape recording format in which the composite video signal is digitized by sampling it at the rate of four times the frequency of subcarrier (4fsc). The 4fsc frequency in NTSC is 14.3 MHz and 17.7 MHz in PAL.
A lower cost alternative to D1, developed by Ampex. This format stores data as a single composite signal rather than a component signal in order to save bandwidth but compromising image quality at the same time.

Audio and video glossary. 2014.

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