PSG sound filter

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Steem SSE sounds better:

With 'PSG Filter' checked
1
33%
With 'PSG Filter' unchecked
0
No votes
Hear no difference
2
67%
 
Total votes: 3

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Steven Seagal
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PSG sound filter

Postby Steven Seagal » Sun Mar 17, 2013 11:55 am

In Steem SSE there's an option to change the filter applied to chip sound, but nobody has reported on this yet.
Do you think it sounds better, worse, the same?
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Re: PSG sound filter

Postby Cyprian » Sun Mar 17, 2013 3:26 pm

I've checked with YmRockerz's Spwheels and I can't hear any difference. It seems that filter is to subtle for me.
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Re: PSG sound filter

Postby Steven Seagal » Sun Mar 17, 2013 8:18 pm

I don't know this one.
It should be very hearable on BIG demo and all chip tunes (Goldrunner...)
Sound option 'Simulated Monitor Speaker' should be selected.
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Re: PSG sound filter

Postby Cyprian » Sun Mar 17, 2013 9:57 pm

Steven Seagal wrote:Sound option 'Simulated Monitor Speaker' should be selected.
ah, thats the reason why I didn't hear any difference. I never use other option than 'Direct'.
I've checked with 'Simulated Monitor Speaker' and that filter sounds interesting. similar to my good old crt tv.
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Re: PSG sound filter

Postby Steven Seagal » Sun Mar 17, 2013 10:13 pm

Cyprian wrote:
Steven Seagal wrote:Sound option 'Simulated Monitor Speaker' should be selected.
ah, thats the reason why I didn't hear any difference. I never use other option than 'Direct'.
I've checked with 'Simulated Monitor Speaker' and that filter sounds interesting. similar to my good old crt tv.


Well if you like 'Direct' you will prefer 'PSG Filter' to original, as it sounds halfway between.
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Steem SSE: http://ataristeven.exxoshost.co.uk/Steem.htm

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Re: PSG sound filter

Postby Zorro 2 » Mon Mar 18, 2013 8:16 am

Hi all,

Only a difference with the STE Microwire checked if you ear a soundchip, the sound less strong.
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Re: PSG sound filter

Postby Steven Seagal » Mon Mar 18, 2013 7:23 pm

Zorro 2 wrote:Hi all,

Only a difference with the STE Microwire checked if you ear a soundchip, the sound less strong.


This is by design, in case of mix PSG/DMA, PSG was too loud (IMO).
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Re: PSG sound filter

Postby Hippy Dave » Mon Mar 18, 2013 9:06 pm

Steven Seagal wrote:This is by design, in case of mix PSG/DMA, PSG was too loud (IMO).

The DMA peak voltage is 3/4 of the YM2149 peak voltage. Thus, the largest
8-bit signed value (127) for the DMA makes a voltage that is 3/4 of the largest
value that comes from the PSG emulation. These are then summed and processed
further.

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Re: PSG sound filter

Postby Steven Seagal » Tue Mar 19, 2013 9:03 pm

Are you saying that on a STE DMA sound was noticeably softer than PSG?
In that case I would reverse the feature.
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Re: PSG sound filter

Postby Steven Seagal » Thu Mar 21, 2013 8:15 pm

One case where it sounds (even) worse with PSG Filter option is Star Trek.

The samples are extremely noisy in all emulators.
I don't remember it sounding so bad on my ST/monitor.
This could be an emulation issue.
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Re: PSG sound filter

Postby Hippy Dave » Fri Mar 22, 2013 3:31 am

Steven Seagal wrote:One case where it sounds (even) worse with PSG Filter option is Star Trek.

The samples are extremely noisy in all emulators.
I don't remember it sounding so bad on my ST/monitor.
This could be an emulation issue.

This is caused by a bad case of aliasing.
Star Trek uses a low sample frequency in the audio range that
aliases with their samples (maybe for effect). The subsequent
harmonics then alias with the sound card.
The solution is to pick an emulator sound card frequency
that sounds acceptable (48000 Hz or 25000 Hz). On Hatari,
one can also select --sound 27720 for example.
But maybe the sound card will not accept 25000 Hz ... oh well.

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Re: PSG sound filter

Postby Steven Seagal » Sun May 26, 2013 4:37 pm

Well, my efforts in the domain haven't really paid off yet.
Right now I plan to leave the samples filter on, but if the sound annoys you (more cracks),
unchecking PSG Filter or Microwire will disable it.
I also added an option in the Startup page to disable DSP:

Image

to be sure and because the 3rd party code I use can cause crashes related to math coprocessor.
Remember, Microwire was very rarely used, and only available on the STE.
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Steem SSE: http://ataristeven.exxoshost.co.uk/Steem.htm

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Re: PSG sound filter

Postby Steven Seagal » Mon May 27, 2013 6:59 am

And here to help with some issues, apparently those are the best options:

Image

"Write to primary buffer" was a hack, "play cursor" isn't the way recommended by M$, milliseconds is approximative.

On my old laptop, in the IDE debug mode, 20ms delay is no problem.
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Steem SSE: http://ataristeven.exxoshost.co.uk/Steem.htm


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