jj@rabbit.UUCP (02/09/84)
Um. You're taking the paper a bit out of context, I fear. -- TEDDY BEARS ARE PEOPLE, TOO! (allegra,harpo,ulysses)!rabbit!jj
kimr@tektronix.UUCP (Kim Rochat) (02/14/84)
Here's a little tidbit that should brighten everyone's day - the digitalphiles
who don't care which way their player thinks is up, the objectivists who insist
on double-blind tests, people who just like quotes from the JAES, and followers
of Len Feldman.
The following paragraph is from a paper in the September, 1983 Journal
of the Audio Engineering Society entitled "On the Audibility of Midrange
Phase Distortion in Audio Systems," by Lipshitz, Pocock, and Vanderkooy.
"The authors have demonstrated the two-tone experiment described above
to numerous people on different systems. No one has ever failed to hear
the timbral change with phase, and discern the polarity reversal on this
with unvarying accuracy. Indeed, in a double-blind demonstration to
eleven members of the SMWTMS audio group, the accuracy score was 100% on
the summed 200-Hz and 400-Hz tones over loudspeakers, and overall, including
musical exerpts, the results on the audibility of the polarity inversion of
both loudspeaker channels were 84 correct responses out of 137, this
representing confidence of more than 99% in the thesis that acoustic polarity
reversal is audible. Some designers nevertheless still believe this effect
to be inaudible."
The remainder of the paper is fascinating reading.
In the unending pursuit of identifying the
proper phase for each of my 1000 records,
Kim Rochat
tektronix!kimr
ps. The Sheffield Track Record is excellent to practice on - the difference
is real obvious.