sampling rate

Daniel Wolf wrote,

>I use 44kH at home, but for small email-able test files, I think
22kH >is
>optimal. Otherwise, convert the 44kH files to mp3.

Isn't the exact value for CDs 44.1 KHz? Also, the Matlab default is
8KHz. Anyone know why? What is standard for playback on most PCs? I'd
like to know because getting the sampling rate exactly right seems
crucial for preventing audible artifacts. Finally, is there a
freeware wav-to-mp3 utitlity?

Paul Erlich wrote:

> Daniel Wolf wrote,
>
> >I use 44kH at home, but for small email-able test files, I think
> 22kH >is
> >optimal. Otherwise, convert the 44kH files to mp3.
>
> Isn't the exact value for CDs 44.1 KHz? Also, the Matlab default is
> 8KHz. Anyone know why? What is standard for playback on most PCs? I'd
> like to know because getting the sampling rate exactly right seems
> crucial for preventing audible artifacts. Finally, is there a
> freeware wav-to-mp3 utitlity?

Yes, 44.1 kHz is the exact value. 8kHz is of some historical importance:
it was the frequency used by Sun workstations, and remains that of the
/dev/audio device on many Unix variants. 44.1kHz is the modern standard,
although the latest Creative Labs cards apparently use 48kHz.

The only MP3 encoder I've found that I can get to work, and doesn't ask
for money, is BladeEnc. See http://bladeenc.cjb.net . It's a
command-line utility, so only 120K.

Paul-

mp3.com has alot of software. here's the page for windows encoders:

http://software.mp3.com/software/all/windows/encoder/

I've been using "MPEG suite", it works fine and is freeware. There's plenty
more there if you feel like wading through them.

Re: sampling rate: remember that you cant render any frequencies higher than
1/2 the sampling rate or you will get aliasing

Dante

----- Original Message -----
From: Paul Erlich <PERLICH@ACADIAN-ASSET.COM>
To: <tuning@onelist.com>
Sent: Saturday, February 26, 2000 2:57 PM
Subject: [tuning] sampling rate

> From: "Paul Erlich" <PERLICH@ACADIAN-ASSET.COM>
>
> Daniel Wolf wrote,
>
> >I use 44kH at home, but for small email-able test files, I think
> 22kH >is
> >optimal. Otherwise, convert the 44kH files to mp3.
>
> Isn't the exact value for CDs 44.1 KHz? Also, the Matlab default is
> 8KHz. Anyone know why? What is standard for playback on most PCs? I'd
> like to know because getting the sampling rate exactly right seems
> crucial for preventing audible artifacts. Finally, is there a
> freeware wav-to-mp3 utitlity?
>
>
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Paul Erlich wrote,
> ... is there a
> freeware wav-to-mp3 utitlity?

There are dozens of good GUI ones (mmm, gooey! ;-). See mp3.com -->
Software --> [your OS] --> Encoders, scroll to bottom of page as select
"Complete List of [your OS] Encoders."

For Windows, that's:

http://software.mp3.com/software/all/windows/encoder/

NexEncode has worked well for me on Windows, while AudioCatalyst does a
great job on Mac.

>Re: sampling rate: remember that you cant render any frequencies higher
>than
>1/2 the sampling rate or you will get aliasing

Actually there�s problems with everything above 1/4 or 1/3 of the sample
rate,especially with closely spaced frequencies as in inharmonic
timbres.Producers know cymbals(which have a very comples high-frequency
register)often create problems in digital recording unless you mute certain
frequencies with EQ,which frequencies are dependant upon the cymbals
themselves.I�m only pointing out that lowering sample rate does distort
sound even if you have very little high frequencies in it.

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Mats �ljare
Eskilstuna,Sweden
http://www.angelfire.com/mo/oljare
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