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Re: artifact in spectrogram analysis

Subject: Re: artifact in spectrogram analysis
From: "Wil Hershberger" wil_hershber=
ger
Date: Tue Jul 17, 2012 4:46 pm ((PDT))

I have heard it referred to as quantization. That is the continuous stream =
to analog audio is quantized into small "words" of length of 16 or 24 bits =
at the sampling frequency.

Wil Hershberger
Nature Images and Sounds, LLC
Hedgesville, WV
The Songs of Insects
My Blog










On Jul 17, 2012, at 7:38 PM, Peter Shute wrote:

> >David, I agree with most of your post, but and at the risk of being
> >contentious, I have to challenge this:
> >
> >> Digital compression is a quite different techique. WAV format digital
> >> compression compresses the digital version down to 16 or 24 bits. This
> >> compression is inaudible and we tend to regard WAV as "uncompressed"
> >> which it is not. Just so good that it is inaudible.
> >
> >To my understanding, 16 or 24 bit pulse code modulation (PCM), the
> >standard formats for professional audio, do none of the things that data
> >compression schemes do. Please explain what you meant.
>
> I took this to mean that the signal is digitised at, say, 32 bits, then d=
owngraded to 16 or 24 before being saved to memory. I wouldn't really call =
that compression though.
>
> Peter Shute
>










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