In Reply to: RE: High Resolution - Fact posted by b.l.zeebub on April 9, 2014 at 10:50:01:
The preview head does use a digitized signal but has nothing at all to do with the signal chain driving the cutterhead.
The idea is you take the output of the preview head (which is an additional tape head on the tape deck, about 2 seconds ahead of the main playback head) and create a digital output from it.
This output is then used to drive the electronics that operate the thread drive motor which advances the cutterhead across the LP. In this way, if there is a loud sound like a bass drum whack, the cutterhead makes room for it one rotation in advance so that the resulting groove will not overcut a previous groove.
This technology has indeed been around for a while and is known as 'variable groove spacing' or the like. The RCA Dynagroove system was an early analog version of the same idea.
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Follow Ups
- That is for the preview head only - Ralph 11:46:26 04/09/14 (2)
- RE: That is for the preview head only - b.l.zeebub 07:27:41 04/10/14 (1)
- that's a sloppy way to do it - Ralph 09:30:40 04/10/14 (0)