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 Forum: SNESdev   Topic: Introducing the VeriSNES (FPGA-based SNES)

Posted: Mon Sep 18, 2017 1:21 pm 

Replies: 224
Views: 38823


I don't think the SNES's low-pass filtering is very strong in the audible range (aside from the Gaussian interpolation done in mixing which functions as one for each sample), but there's aliasing all over the place in the audio of that video. Is that what it actually sounds like, jwdonal? Or is it m...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Wed Apr 05, 2017 3:08 pm 

Replies: 251
Views: 31497


Okay, that's really great! I'm happy to mess with the EQ myself instead of troubling you each time I try to play Whack-A-Mole with a ripple. I got my pin converter. Gotta find where my NES's power supply went and then I'll make recordings with it. My A/V Famicom has also entered America and that sho...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Mon Apr 03, 2017 4:26 pm 

Replies: 251
Views: 31497


I've got the curve of how Mesen using the 60-band preset deviates from the hardware recording. Not bad at all. The picture is zoomed in to show a only 6 dB range, so it's actually much smaller than most of the previous ones. All ripples occur over a range of less than 2 dB and there's only one compa...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Sat Apr 01, 2017 8:34 pm 

Replies: 251
Views: 31497


Using those bands, most ripples are a bit smaller, but it also made bigger ones at 840 Hz and 6.3 kHz, plus the differences at the bottom and top end are bigger, but that's expected and doesn't really matter. I'll see what I can do about those ripples, but I think these bands are more useful for use...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Sat Apr 01, 2017 7:02 am 

Replies: 251
Views: 31497


True, way up there isn't very audible, unless you're boosting significantly, otherwise the frequencies get masked by the lower, more audible ones. Plus, many people won't be able to hear 17.5 kHz basically at all and 20 kHz even less. Those bands were necessary for reproducing the shape of th curve ...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Sat Apr 01, 2017 12:32 am 

Replies: 251
Views: 31497


Cool, thanks for doing that! I recorded the preset with each type of filter. The attached curves show deviation from the hardware recording of the Zelda title screen music. Butterworth allows the closest representation with all frequencies being less than plus or minus 2 decibels off from the refere...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Thu Mar 30, 2017 7:05 pm 

Replies: 251
Views: 31497


Ok, so this is actually a graph of the differences in magnitude at each between your recording and the raw audio out of Mesen. Right. Any chance you could share a graph against an ideal pink noise curve also? Assuming Sound Forge's pink noise generator is ideal, I've attached the difference curves ...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Thu Mar 30, 2017 6:02 pm 

Replies: 251
Views: 31497


Labels for the two Y axes? I tentatively think the right one should be decibels, but... Also, I'm surprised by the ripple you're showing in the passband. Could you describe your entire analysis setup? I believe the numbers on the right don't actually apply at all to what I'm measuring there. They'r...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Wed Mar 29, 2017 11:57 pm 

Replies: 251
Views: 31497


I attached images of the EQ curve produced when matching spectra using 30 points and 60 points. This is from Voxengo CurveEQ, by the way. 60 is what I used in my example audio file, but the curves look pretty similar and sound even more similar than they look. It's something that could probably be a...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Tue Mar 28, 2017 10:33 pm 

Replies: 251
Views: 31497


Well, in what must be record time (just four hours after my last post!) tepples made a test ROM , so I felt I had to do something with it as proper thanks. I made some recordings and EQ profiles, with a Famicom and a Twin Famicom, and I figured I'd share an example result. http://www.mediafire.com/f...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Mon Mar 27, 2017 4:25 pm 

Replies: 251
Views: 31497


Maybe somebody here knows of some open source multiband equalizer program you could use or adapt. 30 bands should give pretty good precision, but I can give volume change values for even more than that. I know there are linear phase and minimum phase EQs out there, but I don't really have any advice...

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Sun Mar 26, 2017 10:46 pm 

Replies: 251
Views: 31497


Interesting you made some model-specific behavior settings. I've been thinking about this with regards to audio, since that's my biggest area of interest, but, like I've said before, I have no capability of programming it myself. You may have seen this recent thread where Great Hierophant made some ...

 Forum: NESdev   Topic: Output Volume Differences between CPU Revisions

Posted: Fri Mar 17, 2017 8:46 pm 

Replies: 6
Views: 931


I have an HVC-CPU-07 Famicom and an HVC-CPU-GPM-02 Famicom and I made test recordings recently of Metroid to check out the differences I'd heard of. Here are comparison files I already had uploaded to share with someone else. http://www.mediafire.com/file/3sg2fgl78ys2i47/Famicom_comparison.zip The o...

 Forum: NES Music   Topic: EZNSF tool for building NES ROM from NSF

Posted: Tue Jan 10, 2017 11:06 pm 

Replies: 2
Views: 2428


I'm sure I'll be using this a lot when I get an Everdrive! In the thread with loopy's FDSStick you said you wanted to figure out how to build FDS files. I'm assuming since this doesn't support that you haven't been able to yet?

 Forum: NESemdev   Topic: Mesen - NES Emulator

 Post subject: Re: Mesen - NES Emulator
Posted: Mon Dec 26, 2016 5:46 am 

Replies: 251
Views: 31497


You keep asking which emulators are accurate, which is not a fair question. Most likely nobody has tried to refine this very specific and subtle aspect of its behaviour against this very specific edge case. If you want to know the answer, make a test ROM that can expose the difference and test it o...
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