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PostPosted: Tue Sep 05, 2017 5:17 am 
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The principle of charity would suggest that Kismet meant precisely "Expecting a sub-99$ FPGA unit [for hardware with the complexity found on an SNES]".


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PostPosted: Fri Sep 15, 2017 11:37 am 
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Hi everybody! I have a new update video for you.

https://www.youtube.com/watch?v=7ae5iUe8diY

Enjoy!


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PostPosted: Fri Sep 15, 2017 6:45 pm 
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Great new video, the core is looking extremely promising. One minor issue deals with the "guards chase you" sound effect in Zelda, your FPGA's output is noticeably more metallic than the real SNES. It is as if there is a low-pass filter that may not be applied.

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PostPosted: Mon Sep 18, 2017 1:21 pm 
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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 maybe a byproduct of zero order hold resampling from 32 kHz to 44.1 kHz in the capture device or something? Or is the interpolation in mixing maybe not implemented?


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PostPosted: Mon Sep 18, 2017 5:42 pm 
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Yeah, if it sounds metallic it could just be a case of bad aliasing.

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PostPosted: Tue Sep 19, 2017 1:09 am 
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Great Hierophant wrote:
Great new video, the core is looking extremely promising. One minor issue deals with the "guards chase you" sound effect in Zelda, your FPGA's output is noticeably more metallic than the real SNES. It is as if there is a low-pass filter that may not be applied.
So I briefly looked into this and I really don't hear what you're referring to. There is only a single short instance of that sound in the recording at around 9:19. I listened to the same sound effect from the following sources:

- Snes9x
- BSNES-debugger (accuracy profile)
- Real SNES using sd2snes
- My FPGA SNES

All of them sound _exactly_ identical to me and I visually inspected their waveforms in audacity as well. I see nothing strange at all. It sounds just as "metallic" on real SNES as it does everywhere else - assuming I understand what you mean by "metallic".

In any case, I'm not sure it makes sense to perform audiophile analyses on a recording that's probably been through a dozen different filters and resamplers by the time it makes it from my FPGA SNES, through my capture card, through screen recorder software, volume adjustment, mixing, video format conversion, youtube processing, etc, etc, etc, etc, etc, etc to your speakers...? O.o


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PostPosted: Tue Sep 19, 2017 8:08 am 
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jwdonal wrote:
Great Hierophant wrote:
Great new video, the core is looking extremely promising. One minor issue deals with the "guards chase you" sound effect in Zelda, your FPGA's output is noticeably more metallic than the real SNES. It is as if there is a low-pass filter that may not be applied.
So I briefly looked into this and I really don't hear what you're referring to. There is only a single short instance of that sound in the recording at around 9:19. I listened to the same sound effect from the following sources:

- Snes9x
- BSNES-debugger (accuracy profile)
- Real SNES using sd2snes
- My FPGA SNES

All of them sound _exactly_ identical to me and I visually inspected their waveforms in audacity as well. I see nothing strange at all. It sounds just as "metallic" on real SNES as it does everywhere else - assuming I understand what you mean by "metallic".

In any case, I'm not sure it makes sense to perform audiophile analyses on a recording that's probably been through a dozen different filters and resamplers by the time it makes it from my FPGA SNES, through my capture card, through screen recorder software, volume adjustment, mixing, video format conversion, youtube processing, etc, etc, etc, etc, etc, etc to your speakers...? O.o


I think that all of those are a factor. I originally tried the sound effect on my TV's built in speaker, and after reading this I tried it again, but this time using a pair of decent speakers that came bundled with an Oppo receiver. The sound was noticeably more metallic, a little more than your Youtube video. This would make sense, the guards are supposed to be wearing metal armor that should clank.

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