Independent sideband
This article will address Independent sideband, a topic of great relevance today that has generated a wide debate in different areas. Independent sideband is a complex topic that has attracted the attention of experts, scholars and even the general public, due to its impact on society. Along these lines, Independent sideband will be analyzed in detail, exploring its different facets, its evolution over time and the implications it has on people's lives. In addition, different points of view regarding Independent sideband will be reviewed, in order to offer a comprehensive view of this topic and encourage an enriching debate.
 |
Independent sideband (ISB) is an AM single sideband mode which is used with some AM radio transmissions. Normally each sideband carries identical information, but ISB modulates two different input signals — one on the upper sideband, the other on the lower sideband. This is used in some kinds of AM stereo (sometimes known as the Kahn system).
ISB is a compromise between double sideband (DSB) and single sideband (SSB) — the other is vestigial sideband (VSB). If the sidebands are out of phase with each other, then phase modulation (PM) of the carrier occurs. AM and PM together then create quadrature amplitude modulation (QAM). ISB may or may not have the carrier suppressed.
Suppressed-carrier ISB was employed in point-to-point (usually overseas) radiotelephony and radioteletype by shortwave (HF). In military use, ISB usually referred to a close pair of FSK radioteletype channels which could be demodulated by a single receiver, and employed in fleet broadcast, point-to-point, and between larger vessels and shore stations on HF and UHF.
References
