[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
GG CBC Records
Dear John and fellow F Minors,
The CBC people were indeed working from acetate. They didn't say that the
'noise' they were trying to remove was humming. (That was merely my
assumption -- obviously wrong.) Still, it seems to me that there is less
on the two CDs that I have. These recordings were made from live
performances when Glenn Gould was very young. Perhaps he didn't hum as
loudly then. Like you, I would not want to remove the humming .
Anne
>Sonic Solutions is a DAW (digital audio workstation) used for editing and
>mastering of material for CD release. The fact that they reduced "surface
>noise"
>suggests that they were working from a vinyl disc (or acetate) as the
analog
>master
>format before converting to digital. These noise reduction algorithms are
very
>
>powerful and can substantially lower the noise floor of older master
formats
>like analog tape (without noise reduction) or other older formats. They
can
>also
>assist with newer recordings by removing what we call "room tone", which is
>the noise signature of a room picked up when working in large auditoria or
>churches. This is quite useful in lowering the noise floor of an acoustic
>recording, particularly "classical" music, which tends to have very quiet
>sections
>and lots of dynamic range.
>
>These algorithms do not, however, do anything by way of removing humming.
>You normally feed in a sample of one second's worth of the noise you wish
to
>remove and this sample needs to be a fairly "steady-state" noise. Since
>humming
>tends to be extremely time- and frequency-variant, the algorithm would have
>a pretty hard time discriminating it from other artifacts within the music
or
>the
>music itself.
>
>But hey, I'd leave it in even if I *could* take it out.
>
>cheers,
>jh
>