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which is equivalent to 45/45?

Posted by Charlie S in Maryland on August 3, 2006 at 08:31:49:
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.
Charlie