VSBrelated

VSBrelated is a term used in communications engineering to describe topics and technologies that employ vestigial sideband modulation or its derivatives. Vestigial sideband (VSB) is a form of amplitude modulation in which one sideband is partially suppressed while a vestigial portion of that sideband remains transmitted. The result is an intermediate spectrum between standard AM and single-sideband modulation, balancing bandwidth efficiency with recoverability.

VSB originated to improve bandwidth efficiency for broadcast channels while keeping receivers relatively simple. In traditional analog television, the video signal modulates a carrier and the upper sideband is partially suppressed, leaving a vestigial portion that can be recovered by appropriately filtered receivers. This approach allows a channel to carry video, audio, and data within a fixed channel width, typically six megahertz in many regions.

A prominent VSB-related application is the vestigial sideband technique used in the NTSC analog television standard, where the vestigial sideband enables the channel allocation used for television. In modern times, VSB concepts persist in digital terrestrial television through 8-VSB modulation used by ATSC, which transmits digital payload within a vestigial-like spectrum in a 6 MHz channel.

Technical characteristics include a trade-off between spectral efficiency and receiver design complexity. VSB allows simpler filtering than pure SSB strains while offering more efficient use of the channel than full AM. In digital formats, 8-VSB supports substantial data rates suitable for high-definition and standard-definition television within a single 6 MHz allocation, with forward error correction and constellation mapping.

VSBrelated topics thus cover theory, standards, and implementations that rely on vestigial sideband modulation or closely related techniques.