Re: [linux-audio-user] Re: Analyzing ogg files

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Subject: Re: [linux-audio-user] Re: Analyzing ogg files
From: Mark Knecht (markknecht_AT_comcast.net)
Date: Wed Dec 03 2003 - 05:38:54 EET

On Tue, 2003-12-02 at 13:06, Andrew Burgess wrote:
> >> Is there a DC offset which the cheap card is eating?
>
> >A DC offset is an interesting idea. How would I test for that?
>
> sox <file> -e stat
>
> displays midline amplitude.
>
> Or try a highpass filter, just as a test.
>

More data, but I'm not sure there's an answer there yet. The first file
creates a very loud glitch sound, which the second one doesn't. The
midline value seems better on the first, assuming this represents DC
offset.

bash-2.05b$ sox gmc2.ogg -e stat
Samples read: 26972160
Length (seconds): 305.806803
Scaled by: 2147483647.0
Maximum amplitude: 0.999969
Minimum amplitude: -1.000000
Midline amplitude: -0.000015
Mean norm: 0.138033
Mean amplitude: 0.000003
RMS amplitude: 0.189967
Maximum delta: 0.959961
Minimum delta: 0.000000
Mean delta: 0.093997
RMS delta: 0.128996
Rough frequency: 4766
Volume adjustment: 1.000

bash-2.05b$ sox examplesustain.ogg -e stat
Samples read: 11361130
Length (seconds): 128.810998
Scaled by: 2147483647.0
Maximum amplitude: 0.649841
Minimum amplitude: -0.661896
Midline amplitude: -0.006027
Mean norm: 0.069344
Mean amplitude: 0.002177
RMS amplitude: 0.092420
Maximum delta: 0.784546
Minimum delta: 0.000000
Mean delta: 0.072115
RMS delta: 0.095279
Rough frequency: 7235
Volume adjustment: 1.511
bash-2.05b$

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