问题：
What is vestigial sideband modulation used for in MPEG?
答案：
Vestigial sideband modulation (VSB) is an advanced digital modulation scheme used for terrestrial wired and over-the-air broadcasting. 8 VSB allows transport of 19.3 Mbps of usable data after forward error correction. 8 VSB in an ATSC system implies eight discrete amplitude levels.
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