Message-ID: <012001bfdd14$64ccefe0$2301a8c0@maly.cz.gmc.net>
From: "Petr Maly" <p.maly@gmc.net>
To: rsgb_lf_group@blacksheep.org
References: <003301bfdce8$94309b00$2301a8c0@maly.cz.gmc.net> <njg6lsg6rshaedu7icae61f3v2agb7ci64@4ax.com>
Subject: Re: LF: Shrinking sounds - fiasco
Date: Fri, 23 Jun 2000 15:10:24 +0200
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>

Paul, you haven't read the previous messages, have you. We don't talk about
compressing sound files.

Petr, OK1FIG

----- Original Message -----
From: Paul Keinanen <keinanen@sci.fi>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, June 23, 2000 1:04 PM
Subject: Re: LF: Shrinking sounds - fiasco


> On Fri, 23 Jun 2000 09:56:46 +0200, "Petr Maly" <p.maly@gmc.net>
> wrote:
>
> >Hello all
> >Yesterday I spent a while with shrinking WAV's in SoundForge and
CoolEdit.
> >In the original file (da0lf), there is nothing heard by ear, but when the
> >file is open in the Gram, the signal trace is clearly visible. I tried to
> >shrink to 50% of the previous length as a first step. I could not hear
> >anything either. When I opened the new file in the Gram, the signal
> >disappeared completely.
>
> Just a check, but what method did you use to shrink these files ?
>
> Any pesky lossy psychoacoustic compression method such as MP3, Musicam
> etc. is definitely NOT suitable for compressing such files. The idea
> with all the psychoacoustic compression is to remove all the data that
> is not going to be _heard_ due to masking by a strong nearby signal or
> by wideband noise (as in this case).
>
> If you use some kind of compression, make sure that you are using some
> _lossless_ compression method.
>
> Paul OH3LWR
>
>
>