Re: [SoX-users] sox adding noize when file smashing

[Robert F. <cap...@gm...>]

Ok. upgraded SoX to 14.0.1, the output files test as identical. Here's the
output from stat
> sox orig_000001jl.wav -s -1 -r8000 -c1 000001jl.wav stat
Samples read:             62583
Length (seconds):      7.822875
Scaled by:         2147483647.0
Maximum amplitude:     0.273477
Minimum amplitude:    -0.244540
Midline amplitude:     0.014468
Mean    norm:          0.016802
Mean    amplitude:    -0.000016
RMS     amplitude:     0.030996
Maximum delta:         0.169841
Minimum delta:         0.000000
Mean    delta:         0.006950
RMS     delta:         0.013814
Rough   frequency:          567
Volume adjustment:        3.657

On Wed, Mar 5, 2008 at 1:31 PM, Chris Bagwell <ch...@cn...> wrote:

> On Wed, Mar 05, 2008 at 01:15:54PM -0700, Robert Ferney wrote:
> > Hi Yall,
> > I'm using sox to convert and downgrade audio files to 8bit 8khz mono wav
> > files ( Microsoft PCM and IMA ADPCM encodings ) to be used in a hardware
> > device, which is only programmed to read those two formats.
> >
> > Test input file is 16bit 44.1khz WAV
> >
> > I'm currently using..
> > > sox input.wav -s -1 -r8000 -c1 output1.wav stat
> > and
> > > sox input.wav -s -1 -r8000 -c1 output_.wav stat
> >
> > When I listen to the files afterwards, I can hear static in the
> background.
> > How can I eliminate this?
> > When using GUI tools to do the transformation, they don't have the
> static I
> > hear from SoX
> > sox -version reports..  sox: v13.0.0
> >
>
> I don't really use ADPCM files so can't comment much on if I've heard
> noise or not.  But here are some suggestions that might help:
>
> 1) Upgrade to v14.0.1 in case a bugfix in this area was already done.
> 2) Try lowering the volume some to prevent clipping.
>
>  sox -v 0.80 input.wav -s -1 -r8000 -c1 output1.wav
>
> 3) Do a search on the SoX mailing list for ADPCM and DCShift.  Rob's
> mentioned in the past about how you can add a filter effect to
> the command line to simulate what some GUI's are doing.  It may
> clear up your noise.  A DCShift could be the cause of clipping/noise.
>
> Chris
>
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-- 
-Robert Ferney  ( Kolbe 4357 Demonstrator / Myer Brigs INTJ )