On 8/30/2014 5:37 AM, Michael Biel wrote:
> Because Blumlein was killed during WW II it is obvious that he was not
> the engineer who Keith Hardwicke was referring to. Besides, Blumlein
> was in research and development, not in record production or cutting.
> By the way, Blumlein was NOT the the one who discovered the art of
> stereo recording. Arthur C. Keller of Bell Labs was doing stereo
> recordings in the Capitol Theater in 1927, four years before Blumlein
> envisioned it. Keller did stereo recordings of Stoki and the Phila in
> 1931. the Brits have done a dandy promotional campaign for Blumlein
> which is why he is "credited by most" even if the "most" are wrong.
But Keller and Blumlein were using very different recording techniques,
so to say that either discovered *the* art of stereo recording isn't
accurate. Keller used spaced omni microphones, while Blumlein used a
pair of figure-8 microphones stacked on top of one another and pointing
at 90 degree angles to one another. The former technique creates the
stereo soundfield from a combination of intensity and phase differences,
while the latter uses intensity differences only. Blumlein also
developed the "45/45" techniquee of cutting a stereo signal into a
single record groove; it became the standard format in the 1950s when it
was reinvented by American engineers at Western Electric.