4VSB is an
abbreviation for 4-level
vestigial sideband modulation, a type of radio transmission capable of transmitting two bits of information (2
2=4) at a time.
Other faster but less rugged forms include
8VSB
8VSB is the modulation method used for broadcast in the ATSC digital television standard. ATSC and 8VSB modulation is used primarily in North America; in contrast, the DVB-T standard uses COFDM.
A modulation method specifies how the radio sig ...
and
16VSB. While
2VSB is more rugged, it is also slower.
References
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Radio modulation modes