
If you had to give 4fs c a designation
akin to 4:2:2, you might call it 4:0:0.
In industrial and consumer video, subcarrier often free-
runs with respect to line rate, and the advantages of
frequency interleaving are lost. Most forms of analog
videotape recording introduce timebase error; left
uncorrected, this also defeats frequency interleaving.
Composite digital SDTV (4fs c)
Processing of digital composite signals is simplified if
the sampling frequency is a small integer multiple of the
color subcarrier frequency. Nowadays, a multiple of four
is used: It is standard to sample a composite NTSC or ...