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which is equivalent to 45/45?

I believe that English Decca had developed a lateral (sum)/vertical (difference) cutter head in parallel with Westrex's 45/45 one. When the 45/45 system was formally adopted, I think the earliest commercial Decca/London stereo LPs were mastered using that L/V cutter. The Decca stereo pickup was a parallel development, being a L/V design matrixed to 45/45.

Incidentally, if memory serves, Jerry Minter in the U.S. was working on a stereo disc adding the L-R difference on a lateral high-frequency carrier. Sorta a forerunner of the later CD-4 idea.


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  • which is equivalent to 45/45? - Charlie S in Maryland 08:31:49 08/03/06 (0)

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