Search found 39 matches

by nothingtosay
Mon Jan 15, 2018 2:31 am
Forum: NES Hardware and Flash Equipment
Topic: Sharp C1 cannot use expansion audio?
Replies: 5
Views: 1924

Re: Sharp C1 cannot use expansion audio?

I can't offer any insight myself, but this surprises me because Namco composer Hiroyuki Kawada said on Twitter that the company used C1s for Famicom development. Guess those who were working on expansion audio games must have used different hardware.
by nothingtosay
Thu Jan 04, 2018 2:07 am
Forum: Homebrew Projects
Topic: A new and improved Donkey Kong port
Replies: 78
Views: 34497

Re: A new and improved Donkey Kong port

I thought you might appreciate knowing that someone else loaded the game up on an Everdrive and flipped their CRT on its side! The TV is some mediocre Sanyo, nothing special, just something I got from a friend that's been sitting on my floor doing nothing, so I figured why not give it a try? Donkey ...
by nothingtosay
Mon Sep 18, 2017 1:21 pm
Forum: SNESdev
Topic: Introducing the VeriSNES (FPGA-based SNES)
Replies: 307
Views: 135217

Re: Introducing the VeriSNES (FPGA-based SNES)

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...
by nothingtosay
Wed Apr 05, 2017 3:08 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Mon Apr 03, 2017 4:26 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Sat Apr 01, 2017 8:34 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Sat Apr 01, 2017 7:02 am
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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 ...
by nothingtosay
Sat Apr 01, 2017 12:32 am
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Thu Mar 30, 2017 7:05 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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 ...
by nothingtosay
Thu Mar 30, 2017 6:02 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Wed Mar 29, 2017 11:57 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Tue Mar 28, 2017 10:33 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Mon Mar 27, 2017 4:25 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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...
by nothingtosay
Sun Mar 26, 2017 10:46 pm
Forum: NESemdev
Topic: Mesen - NES Emulator
Replies: 777
Views: 304530

Re: Mesen - NES Emulator

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 ...
by nothingtosay
Fri Mar 17, 2017 8:46 pm
Forum: NESdev
Topic: Output Volume Differences between CPU Revisions
Replies: 6
Views: 2298

Re: Output Volume Differences between CPU Revisions

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...