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- by kode54 at 2:40 AM EST on December 13, 2017
- Hi, Sonic 2 and 3 distorted the DAC on their own, due to a programming error. The DAC must be fed manually on interrupts, and they didn't bother to feed the DAC during the vertical blanking interrupt, so you get 60Hz worth of blank spots in every sample. Or 50Hz in PAL regions, I guess?
- by Mr.Sanic at 11:35 AM EST on December 13, 2017
- hmm
Makes sense
But why Sonic 1 didn't had those distortions?
Pratically STH2 has the same DAC as STH1 !
- by Kurausukun at 7:26 PM EST on December 13, 2017
- Might have something to do with the fact that Sonic 1 used 68k whereas Sonic 2 onward used Z80.
- by Mr.Sanic at 8:49 PM EST on December 13, 2017
- oooh
forgot about that.
But how about the PCM samples?
what is the default sample rate?
3200?
- by kode54 at 9:49 PM EST on December 13, 2017
- There is no default sample rate. They're cycle or interrupt timed to the port, one at a time.
- Properly ripped samples by birdmanager6 at 10:59 PM EST on December 13, 2017
- Yeah, part of the reason the DAC sounds so bad is because, well, it's the MegaDrive's PCM we're talking about. Practically everything sounds bit-crushed on that system.
However, I have managed to rip all the DAC samples from Sonic the Hedgehog 3. It took me three tries to make sure I got all of them. Many of them are at the wrong frequency, meaning you will need to change the frequency to match what they sound like in-game, but they sound miles ("Tails" Prower, that is XD) better than they do through the YM2612's DAC. Here they are:
https://drive.google.com/file/d/1W-pFu1xqMTfYEko5sMKLQtarcOUobGIH/view?usp=sharing
Feel free to update the soundfont with these samples replacing the bad-sounding recordings from in-game, but I would prefer it if you would credit me.
I also had previously extracted the DAC sounds from the other two games, so here they are:
https://drive.google.com/file/d/16Bs7eBjF8K_CXZk0X8coo6A0XJ_L7Y5N/view?usp=sharing
https://drive.google.com/file/d/1A6Qgglm_fSLdyxCPlfP5fRE0Xky5J6k6/view?usp=sharing
And no, I looked in an audio editor and the samples from the first two games are NOT identical (2 has a lot more samples as well.) Sorry, no Sonic 3D or Spinball yet. I will do those later.
edited 11:00 PM EST December 13, 2017
edited 11:01 PM EST December 13, 2017
- by Jesse_ at 10:34 PM EST on December 15, 2017
- That's interesting
How did you rip them?
MD Output?
- by kode54 at 6:05 AM EST on December 17, 2017
- I am going to guess that he found them inside the ROM data and extracted them.
- by mariofan12ify at 9:39 AM EST on December 17, 2017
- In my opinion, I would say Banjo-Kazooie, Banjo-Tooie and Donkey Kong 64 have one of the highest quality soundfonts I've heard.
- by Jesse_ at 10:05 AM EST on December 17, 2017
- @Kode54
Hmm...
But those samples doesn't sound as the ones used in game.
In other words,they're noisy and kinda weird...
Btw still good
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