Subject: Re: [linux-audio-dev] peakfiles and EDL's
From: Robert Schrem (Robert.Schrem_AT_WiredMinds.de)
Date: Mon Feb 26 2001 - 18:49:37 EET
On Mon, 26 Feb 2001, you wrote:
> >From: Robert Schrem <Robert.Schrem_AT_WiredMinds.de>
> >
> >I think the values in a peak file should correspond to the level
> >meters of a compact casette recorders display. It should correspond
>
> It is often the peaks we are interested in to see in the waveform.
If you would take only one peak value for 2048 samples you won't
see much of a waveform anyway. Only singnals BELOW a frequency of
44100/2048 ~ 20 Hz would show a recongizable waveform. And this
only if you would apply antialias filtering. If you use peak
files you care more about the big picture: If you whould like
to see 1 Minute of music at once. If your screen resolution
is 1600x1200 you whould need
44100 samples * 60 seconds / 1600 pixels = 1650
- roughly every 1650 samples a computed peak value.
Again, noone would expect to be able to see any
waveform... You would expect to see the 'loudness'
of the track over time - at least this is my opinion :)
> (By the way, you didn't mail to the list but personally to me...)
Unintentional, but I'm not sure if I'm on the right track anyway ;)
Robby
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