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Author Topic: Non 8 -bit audio  (Read 9102 times)

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Offline d0pefish

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Re: Non 8 -bit audio
« on: September 12, 2006, 02:09:54 PM »
Any program that is compatible with AHI will let you use the AHI Paula 14bit HiFi Stereo mode.

If you you a doublescan screenmode (31khz) you can then crank the audio frequency from 27KHz to 44.1 or 48KHz which greatly clarifies the sound most of the time.

Maybe these sound comparisons I made for someone else will give you an idea of just how good Paula can sound with the right settings and software.

http://lavaburn.com/files/amiga-audio-comparison/
The files will stream if you drag and drop the links into Winamp/Foobar2000 etc.

This is a 22 channel (IIRC) XM module (FREETRUE.XM) playing on DigiBooster using various AHI modes. Any clicks and pops are DigiBooster's fault; I don't think it has any volume ramping to smooth out the samples.

I used the CyberSound 14bit calibration tool to prepare the calibrated modes.

The Hifi 14bit 48KHz mode with calibration sounds very nice if you can use it (I have an 060/50 and lots of fast ram so I dont notice any lag etc - your mileage may vary).

The difference between 8 and 14bit calibrated is very significant - notice the hissing in 8bit mode as the samples are cut down to 8bit.

But it should help you decide if you need a sound card or not. I'll be sticking with Paula for a long time yet, unless I find a zorro sound card cheap. :-)
 

Offline d0pefish

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Re: Non 8 -bit audio
« Reply #1 on: September 13, 2006, 02:15:04 PM »
I *think* the screenmode must alter the clock speed of the chipset as a whole, also affecting Paula, with the nice side effect of allowing you to push the frequency up. :-)

Since I'm on CyberGraphX, I use a patch in my startup-sequence to throw the (unused) AGA screenmode to a double scan mode.

The command comes with AHI and goes like:

AddAudioModes DBLSCAN

This lets me use Paula+AHI at 48KHz transparently with RTG.