Main Page | See live article | Alphabetical index 4VSB is an acronym for 4-level vestigial sideband modulation, capable of transmitting two bits (22=4) at a time. Other faster but less rugged forms include 8VSB and 16VSB. Only 2VSB is more rugged, however it is also slower. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.