Re: Limits of mp3

On Sun, 17 Feb 2008 15:38:28 +0100
Stephane Ascoet <sascoetofset.org> wrote:
> Gale Andrews a écrit :
> > must listen on a phone it's essential or you won't
hear it properly at
> > all. 
> > 
> Why?

Because of the low quality of phone speakers. Quiet parts of
the 
music can't be heard unless you turn the volume up so high
that
the loud parts then distort.

Gale





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Yes, Stephane,

The phone amplifier has a vocal range 
(100hz to 1Khz {?})....unlike the 20hz 
to 20Khz musical range....

BG
<scalemodeleralltel.net>

Gale Andrews wrote:
> On Sun, 17 Feb 2008 15:38:28 +0100
> Stephane Ascoet <sascoetofset.org> wrote:
>> Gale Andrews a écrit :
>>> must listen on a phone it's essential or you
won't hear it properly at
>>> all. 
>>>
>> Why?
> 
> Because of the low quality of phone speakers. Quiet
parts of the 
> music can't be heard unless you turn the volume up so
high that
> the loud parts then distort.
> 
> Gale
> 
> 
> 
> 
> 
>
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> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
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It was 17 Feb 2008, when Gale Andrews commented: 
 
> On Sun, 17 Feb 2008 15:38:28 +0100
> Stephane Ascoet <sascoetofset.org> wrote:
> > Gale Andrews a écrit :
> > > must listen on a phone it's essential or you
won't hear it properly at
> > > all. 
> > > 
> > Why?
> 
> Because of the low quality of phone speakers. Quiet
parts of the 
> music can't be heard unless you turn the volume up so
high that
> the loud parts then distort.

Another factor.  The standard for POTS phones allows for
voice limited to 
30 Hz to 3000 Hz.  A bare minimum for speech only. 
Amplification and 
compression doesn't change the limitations of that
bandwidth.  When Sprint 
started the whole "pin drop" promotion, the
difference was boosting the 
bass, IIRC, but the high end was the same.

The limits were established based on the limitations of the
hardware a 
century ago.  Some of the other electrical tolerances are
still the same 
also, and can cause serious problems with newer electronics.
 The phone co 
says "well, that's what the standard allows, and we
lived up to the 
standard, and if smoke comes out of your new phone, hey,
sucks to be you."

Doesn't always happen, but it happens.  Look for "loop
current" in 
particular as what might turn out to be a serious issue with
some phone 
electronics.



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