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PostPosted: Sat Oct 01, 2005 4:00 am 
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Location: BC, Canada
I can't think of a better place to ask this question, since you guys are the end all of NES info. Also, I would have no idea what to search for in the Search option to find the answer to this question, so here goes.

I want to create my own vocal samples that emulate the NES sound. For example, I want to make my own versions of the "Blades of Steel!" of Blades of Steel, or the "HEY!" of TMNT3, or the "LAZER!" of Gradius 2.

Basically, I need to know what the specs are of those recordings, if there are any. Is it an actual bitrate and sample rate? Or is it purely noise?

I found out Winamp will allow me to export normal wav files as DSP Group TrueSpeech 8.000kHz, 1bit, mono wavs. it sounds pretty close to the NES. But still a little too clean.

Any ideas?


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PostPosted: Sat Oct 01, 2005 7:45 am 
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Those effects are usually done through the DMC (aka DPCM), which can play snippits of audio recordings. There are .wav to .dmc converters which you can use to convert your own clip to the format used by the NES. I think the Meridian guy made such a converter.

DMC samples eat a significant portion of PRG space.. so if you're tight on space in the $C000-FFFF area you might want to reconsider.

Once you have the .dmc file you can just put it in PRG somewhere where it's accessable through $C000-FFFF.. then set the DMC registers ($4010-4013) accordingly, and flip on the DMC (write 1 to -> $4015.4) to play the sample.


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PostPosted: Sat Oct 01, 2005 9:47 am 
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On the PC Sound Tools section of this site there's some converter programs that Bananmos made. With those you could convert an 8-bit .wav to DPCM, then convert it back to .wav.

You probably want to reduce the volume in the original .wav file to about 1/8th of it's original, or it'll clip really badly.


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PostPosted: Sat Oct 01, 2005 1:36 pm 
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This is great stuff guys! Much appreciated!


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