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Music Tech Note: Converting to 22 KHz E-Mail
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SchwachPerfekt 
Geschrieben von: Aenn   
Samstag, 23. Oktober 2010 um 12:43 Uhr

 

This little article deals with how to convert a music piece to 22 KHz with as little damage as possible.

First of all, a simple formula. Detail limit of a sampled format is sampling frequency/8. In scientific sampling, a sampled signal is considered accurate as long as the sampling frequency is 8 times the frequency of the signal to be sampled. This is because 8 coordinates are required to describe a sine wave: 4 positive, 4 negative.

Hence, by the way, you need 160 KHz sampling to accurately represent 20 KHz (so much for CD audio's claims of "22 KHz bandwidth" - 22 KHz, yeah, but for noise, not music, detail limit is much lower).

Thus: 44100 Hz (CD audio) divided by 8=5512.5 Hz. Enough for midrange, but there's already distortion in the treble and high frequencies. 22050 Hz (Descent 3 sampling format for music) divided by 8=2756.25 Hz. Not very detailed, is it?

So what happens when you go over the magical f/8 limit? Aliasing happens. Rectification distortion, foldover, etc. Everything becomes "squarish" (or more precisely, triangular). The minimum time frame also becomes 0.36 msec., which is slow (to human perception that sounds "stiffy", "woody").

And that tends to sound weird. Get an acoustic instrument record and downsample to 22050 Hz, then listen to what happens to treble and space harmonics. But never fear, for there are ways to smoothing out the damage.

Zuletzt aktualisiert am Samstag, 23. Oktober 2010 um 22:08 Uhr
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The Cold Weather Blah E-Mail
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Geschrieben von: Wazz the snow fox   
Mittwoch, 13. Oktober 2010 um 17:15 Uhr

 

Today is cold.  After an unseasonably warm September here in Winnipeg, October seems to be making up for lost time.

If you had to work outside like I did, your prime directive was to stay in the sun as much as possible.  Soon even that won't be warm enough.  I'm not complaining... Winnipeg wouldn't be Winnipeg without six months of extreme cold every year.

Zuletzt aktualisiert am Freitag, 15. Oktober 2010 um 12:19 Uhr
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Descent 3 1.4 - 1.5 Version Switcher E-Mail
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Descent 3 - Descent 3 Dateien
Geschrieben von: Thomas   
Freitag, 11. Juni 2010 um 13:31 Uhr

 

The unoffical version 1.5 patch of Descent 3 fixes many bugs the 1.4 version contains. This would be pretty nice if it didn't introduce many additional bugs that outweigh its benefits again. That's why most pilots still run 1.4.

Now there's no reason anymore to stick with just one of these two Descent 3 versions.

D3VS01

The Descent 3 Version Switcher is a little utility that lets you switch between both versions, 1.4 and 1.5. It contains the files that are different between those versions and applies them according to your selection.

Zuletzt aktualisiert am Mittwoch, 10. November 2010 um 21:41 Uhr
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Running D3Server3 as a Windows service E-Mail
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Descent 3 - Descent 3 dedicated Server-Tool für Windows
Geschrieben von: Thomas   
Samstag, 09. Oktober 2010 um 10:27 Uhr

 

D3ServerMainWindowWithServer02newThe new version of the Descent 3 dedicated server tool D3Server3 can run as a Windows service. This means that no user needs to be logged on to the system, and all dedicated servers can run entirely in the background.

This also means that you can set it up to automatically start up when the system is turned on or restarts and that you can configure a recovery strategy in case it fails. By and large, all benefits of a Windows service apply to your server tool and the dedicated Descent 3 servers it controls.

Zuletzt aktualisiert am Sonntag, 02. Februar 2014 um 10:59 Uhr
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7-Zip E-Mail
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Kostenlose Software - Packers and compression utilities
Geschrieben von: Thomas   
Mittwoch, 26. Mai 2010 um 16:11 Uhr

 

Are you still compressing and archiving your data as zip files?
In that case you might want to have a look at 7-Zip.

7zipmain01

Not only does 7-Zip compress better. The free open-source product comes with a complete file manager, command line utility, and documentation.

Zuletzt aktualisiert am Samstag, 13. November 2010 um 22:35 Uhr
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