Helical scan

The head drum of a Hi-Fi NTSC VHS VCR; three of the six heads face the reader. The helical path of the tape around the drum can clearly be seen.

The same head drum with the rotating portion elevated for clarity

The rotating portion of the head drum showing the rotary transformer and three of the six tape heads used in this particular VCR

Helical scan is a method of recording high frequency signals on magnetic tape. It is used in reel-to-reel video tape recorders, video cassette recorders, digital audio tape recorders, and some computer tape drives.

单词	Helical scan
释义	Helical scan 英语百科 Helical scan Helical scan is a method of recording high frequency signals on magnetic tape. It is used in reel-to-reel video tape recorders, video cassette recorders, digital audio tape recorders, and some computer tape drives.
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