Sel-Sync

Sel-Sync or Selective Synchronous recording is the process of selectively using some record heads as play back heads so that new signals can be recorded on other tracks in perfect sync with the existing tracks. Sel-sync recording dramatically changed the recording process allowing overdubbing of individual recorded tracks.

Sel-sync along with the multi-track head was invented by Ross Snyder at Ampex in 1955. Three problems had to be solved: mechanical alignment, switching of the record track to playback mode and multitrack erase head. The hard problem was the switching of a track between record and playback mode, as the impedance of record heads are quite different from the impedance of play back heads. Prior to Sel-Sync record heads were directly wired to the record electronics and playback heads were directly wired to the playback electronics. Also the designs of the two heads were very different. The problem of switching very low-level/high-impedance circuitry without introducing hum or noise had to be solved. Mort Fujii in the Ampex special projects lab was responsible for the actual design.

Selenipedium

Selenipedium is a genus of the Orchid family (Orchidaceae) (Subfamily Cypripedioideae). The genus has been given its own tribe, Selenipedieae, and subtribe, Selenipediinae. It is abbreviated Sel in trade journals.

The name of the genus is derived from the Greek selen, which means "moon", and pedium, which means "slipper" (referring to the pouch).

The seed capsules of these Central and South American lady's slipper orchids were formerly used as vanilla substitutes, but selenipediums are now rarely cultivated. Partly this is because of the difficulty of doing so, but is probably also due to the relatively small size of the Selenipedium's flower. The wild flower's Amazonian habitat is also under threat, so extinction is a risk for all species of Selenipedium.

There are only six true selenipedium species known ():

Sel (disambiguation)

Sel is a municipality in the county of Oppland, Norway.

Sel may also refer to:

See also

Sel (given name)

Sel is an Australian masculine given name, and may refer to: