Sound Filters to Improve GBA Audio?

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Phaedrus
Posts: 25
Joined: Mon May 25, 2020 12:57 am

Sound Filters to Improve GBA Audio?

Unread post by Phaedrus »

With the new audio filter feature would it be possible to try and improve the GBA audio a bit?

For example I'm playing Mother 3 and the music is great but there is a persistent hum/buzz/hiss that exists on the actual hardware. The music files have been taken from the game and don't have the quality issue on their own, so it's just the way the GBA is using it.

The documentation for the audio filters is a bit light and I'm not much of an audio savvy person, so I'm not sure where to start.

Is this something worth pursuing, or is this not what the audio filters are intended for?

I've tried the LPF example files from here: https://github.com/MiSTer-devel/Main_MiSTer
one of them seems to have no effect on the fuzz and the 2tap and 3tap ones just make everything very quiet.

https://github.com/MiSTer-devel/Main_Mi ... io-Filters

https://forum.starmen.net/forum/Games/M ... zzy-on-VBA

https://earthboundcentral.com/2012/09/f ... r-3-audio/
ExCyber
Posts: 92
Joined: Sun May 24, 2020 3:33 pm

Re: Sound Filters to Improve GBA Audio?

Unread post by ExCyber »

The problems allegedly start with the game's music engine losing resolution when it mixes samples. If this is true, I don't think a filter on the output can really fix it; that's basically the audio equivalent of the "zoom and enhance" trope. I'd guess that really fixing it would involve altering the game to mix at a higher quality and then overclocking the CPU to handle the extra work.
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Phaedrus
Posts: 25
Joined: Mon May 25, 2020 12:57 am

Re: Sound Filters to Improve GBA Audio?

Unread post by Phaedrus »

Well that would be awesome to get something like an MSU option to replace the entire sound track, but I'd just be happy with getting rid of a bit of hiss.
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