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From Wikipedia, Chace Audio

VHS (Video Home System) was launched by JVC in 1976 as a consumer video/audio storage technology. A 1/2” analog videotape cassette using the thinnest acceptable thickness of tape, VHS could record and playback at three different speeds (SP – Standard Play, LP – Long Play, and EP / SLP – Extended Play / Super Long Play) to achieve varying playback times. Slower speeds resulted in lower quality.

Famously defeating Betamax in the format war of the late 70s / early 80s, VHS offered longer playing time, faster rewinding and fast-forwarding, and lower-costs than its rival. VHS remained the dominant home video format until DVD technology became available in the 1990s.

The original linear VHS audio track had very limited headroom and a relatively narrow frequency range of around 100Hz to 10kHz. Higher quality VHS machines made after 1985 were capable of recording Hi-Fi tracks embedded within the video signal that gave the format much higher audio quality, achieving a frequency range of around 20Hz to 200kHz, as well as greater dynamic range and signal-to-noise ratio.

These Hi-Fi soundtracks were much enjoyed by audio enthusiasts for their outstanding quality. However, the thin tape degrades quickly and makes VHS an unsuitable source for professional post production servicing.

S-VHS later offered greater picture resolution than standard VHS. Super-VHS tapes were also used as digital multi-track audiotapes for the ADAT format. Many film multi-tracks were “archived” on ADAT tapes in the 1990s.

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