General Asylum

Posted by Charlie S in Maryland on August 03, 2006 at 08:31:49

In Reply to: yes posted by Kal Rubinson on August 2, 2006 at 19:18:03:

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