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08 January 2007, 04:16
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#1 |
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2064
Join Date: Jul 2005
Location: de
Posts: 231
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[bug]stereo separation
Stereo separation seems only to work if you change it during emulation. It shows up correctly (40%) when config is loaded but it doesn't have any effect (always 100% / full stereo).
Another minor bug: 0% is the same as 100%. Should be mono instead i think... Last edited by NoX1911; 09 January 2007 at 21:23. |
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09 January 2007, 21:50
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#2 |
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2064
Join Date: Jul 2005
Location: de
Posts: 231
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DC offset in audio waves. Its not a static offset (changes from time to time - sample to sample?).
I think it even differs at the same place sometimes so it could be an emulation issue. Sinc 44.1khz stereo Kick1.3/OCS  Upper 2 = Original Winuae Left/Right channels recorded with built-in recording option Bottom 2 = DC corrected by external software. Waves should be centered at zero line (red line). It's not that critical but should be avoided if possible. Those "instant" jumps that lead from one offset to another could be audible. |
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09 January 2007, 22:01
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#3 | |
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,505
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Quote:
(will check stereo separation later) |
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09 January 2007, 22:11
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#4 |
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2064
Join Date: Jul 2005
Location: de
Posts: 231
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The picture shows audio track of 'it came from the desert' avi video. Other games like 'running man' show the same issue.
I will check some different filters and settings. Maybe save state restoration affects as well. |
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09 January 2007, 22:20
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#5 |
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,505
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4 Paula channels to 2 real stereo channel mixing artifact?
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10 January 2007, 01:37
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#6 |
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2064
Join Date: Jul 2005
Location: de
Posts: 231
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I tested the game P.O.W..
The intro tune differs at silent parts sometimes. I recorded it 3 times and compared it.  On the first training mission you have to shoot moving targets by mouse crosshair. Two samples are audible. A successfull hit confirmation (high pitch beep) and a machine gun sample everytime mouse button is pressed. (Audible sample file is attached to this post)  The beep sample is larger in vertical size and ~0.2secs long. The machine gun is ~0.7secs and has lower volume. The strange thing is.. the beep sample seems to be played correctly whereas the machine gun goes up and down all the time. Only the left speaker channel was used by the game (2 samples = 2 channels ?). Beside POW i tested some pre-game intros. They all played correctly. The "bug" may only occur on heavy stress or user input. It may be even original amiga behaviour. To get a proof someone would have to sample a real amiga sound output and compare it to winuae output. Last edited by NoX1911; 10 January 2007 at 01:53. |
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10 January 2007, 08:14
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#7 |
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,505
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I think I know the reason, second non-playing channel still has the last played sample value in its output. (and it may not be zero)
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13 January 2007, 19:50
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#8 | ||
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,505
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Quote:
Quote:
Complete test is: if stereo separation == 0 and stereo mixing delay == 0 -> set stereo separation to 100%. |
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