Impulse noise has much higher frequency harmonics than the audio
signal - these harmonics are not audible. However, DSP algorithms
can more clearly distinguish between noise and signal when these
higher frequency harmonics are present, and then more cleanly
remove the noise without affecting the signal.
I'm talking about impulse noise generated by mechanical damage
(scratches, gouges, cracks) and contamination to the audio carrier.
I'm NOT talking about impulse noises that were part of the
acoustic environment when the recording was made, noises that
might have been picked up by a microphone.
The Audio Archive
From: Association for Recorded Sound Discussion List
[mailto:[log in to unmask]]On Behalf Of Goran Finnberg
Sent: Saturday, June 25, 2005 4:19 AM
To: [log in to unmask]
Subject: Re: [ARSCLIST] 2GB limit for audio file formats
> Also a greater sampling frequency doeas not make a more detailed
The physological rise time of the ear is of the order of 250 ÁS.
So anything faster than that isn┤t distinguised by any audible change to
the perceived sound.
This has been stated by a nuber of researches from the past and also by
Stephan Peus head of research at Neumann GmbH.
So 20 kHz cutoff is fine for precision audio.
Or a Neumann KM84 which within its bandwith, 20 kHz, displays near
The Mastering Room AB
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