Editing VHS (section)

=== Tape loading technique ===
[[File:VHS diagram.svg|thumb|200px|VHS M-loading system]]
As with almost all cassette-based videotape systems, VHS machines pull the tape out of the cassette shell and wrap it around the inclined head drum, which rotates at 1,800 rpm in NTSC machines<ref>{{cite web
|url=http://electronics.howstuffworks.com/vcr2.htm
|title=How VCRs Work
|date=February 10, 2011
|access-date=February 10, 2011
|first=Marshall
|last=Brain
|publisher=HowStuffWorks
|page=7
}}</ref> and at 1,500&nbsp;[[Revolutions per minute|rpm]] for [[PAL]], one complete rotation of the head corresponding to one video frame. VHS uses an "M-loading" system, also known as M-lacing, where the tape is drawn out by two threading posts and wrapped around more than 180 degrees of the head drum (and also other [[tape transport]] components) in a shape roughly approximating the letter [[M]].<ref>{{Cite web|url=https://www.newscientist.com/article/mg12316724-000-technology-vhs-video-that-begins-at-the-beginning/|title=Technology: VHS video that begins at the beginning|website=New Scientist|language=en-US|access-date=2020-01-22}}</ref> The heads in the rotating drum get their signal wirelessly using a [[rotary transformer]].