"Jim Lesurf" wrote in message
In article
, Arny
Krueger
wrote:
"John Phillips"
wrote in message
On 2008-06-16, Jim Lesurf wrote:
IIRC Lipschitz and Vanderkooy were publishing about
dither in JAES in about 1984 and just after. Although
dither had been know for a long time I suspect you are
right that noise floors for material transferred to CD
were probably sufficient in the early days of CD
(1982-ish) to render external dither unnecessary.
AFAIK Vanderkooy and Lip****z were knowingly publishing
old news, in an effort to overcome some pretty strange
false claims that were being circulated at the time by
people who should have known better.
That is also my recollection. I can't remember when the
first work on dither was done, but I think it was
produced a long time ago. Hence there really isn't much
excuse for someone writing magazine articles like NKs not
to understand it. I was certainly reading about such
matters long ago.
The author that V&L were "answering" was a professor Professor PB Fellgett,
and published in 1981.
I comment on a posting of it in this post:
http://groups.google.com/group/rec.a...e7d88bbec10f81
Much of its contents are quoted.
I'd be interested in seeing data on the noise performance
of studio mics and preamps, etc. If I recall correctly,
their bandwidths also may cast some doubt on the idea
that LP recordings provide wide ultrasonic bandwidths of
genuine recorded sounds. (As distinct from distortion
products, etc.)
The quietest mics have A-weighted noise equivalent to an acoustical level
that is just under 10 dB. Most serious mics have A-weighted noise equivalent
to an acoustical level that is 20 dB or less. The weighting curve is
significant because the spectral contents of microphone internal noise can
vary depending on the technology used to build the mic.
IME it is not difficult to find mic preamps and converters that are quiet
enough that they don't materially add to the noise coming out of a typical
capacitor microphone.
Dirty Digital [sic.]
Hybrid Mode
