Re: [linux-audio-user] Nasty, Raspy Raw Data (Was: Removing distortion)

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Subject: Re: [linux-audio-user] Nasty, Raspy Raw Data (Was: Removing distortion)
From: Erik de Castro Lopo (erikd-lad_AT_mega-nerd.com)
Date: Thu Jul 11 2002 - 00:27:22 EEST

On Wed, 10 Jul 2002 17:48:29 +0200
Joern Nettingsmeier <nettings_AT_folkwang-hochschule.de> wrote:

> "Kingsley G. Morse Jr." wrote:
> >
> > Thanks for the suggestions, everyone.
> >
> > It would be great to clean up the distortion.
> >
> > It seems to me that sharing its raw data may improve
> > our discussion.
> >
> > Toward that end, a short sample is at
> >
> > http://www.nas.com/~change/private/dist.wav
> >
> > The distortion is about 3 seconds into the sample,
> > after the speaker pauses and says the word
> > "Following".
>
> excuse me, but the distortion is really not the main problem with that
> sample...
> alsaplayer seems to think it's 9khz sampling rate,

Here's the output from sndfile-info (part of libsndfile):

        erikd_AT_coltrane > sndfile-info dist.wav
        Version : libsndfile-1.0.0

        ========================================
        File : dist.wav
        RIFF : 99584
        WAVE
        fmt : 16
          Format : 0x1 => WAVE_FORMAT_PCM
          Channels : 1
          Sample Rate : 9600
          Block Align : 2
          Bit Width : 16
          Bytes/sec : 19200
        data : 99548
        
        ----------------------------------------
        Sample Rate : 9600
        Samples : 49774
        Channels : 1
        Format : 0x00010002
        Sections : 1
        Seekable : TRUE
        Signal Max : 27886

> and there seems to be
> an endianness problem or something equally weird.

There's something weird about it but its not an endian-ness problem.

I think is just a really, really, REALLY crappy recording.

Since this is more that just clipping, you will not be able to remove
the distortion.

Erik 

-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo  nospam_AT_mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
The word "Windows" is a word out of an old dialect of the 
Apaches. It means: "White man staring through glass-screen 
onto an hourglass..."

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