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Started by cpcitor, 22:21, 03 November 21
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sound 2,284,50,15 : sound 2,6,50,15
Quote from: roudoudou on 22:37, 03 November 21the crappy high pitch sound is due to aliasing/rounded index for replayi asked Megachur to let his emulator run at higher replay rate (up to 192KHz) and it solve easily most the high frequencies replay (still not perfect but really better)a solution for high frequencies replay at 44Khz or 48Khz may be to use sinus instead of squares and let shanon do the rest
Quote from: cpcitor on 22:21, 03 November 21You might be wondering why I'm asking this.
Quote from: cpcitor on 12:57, 04 November 21Shannon does not say to replace the square with a sine, and there's no need to deviate from the chip behavior like this.
Quote from: eto on 14:42, 04 November 21Indeed - and knowing it might make help to motivate people to attach cables and record it ;-)
Quote from: Aeliss on 18:37, 04 November 21Here a sample on Arnold https://www.cjoint.com/c/KKerLtQRdgaSome sound part are totaly missing
Quote from: andycadley on 18:16, 04 November 21If it works on real hard, you should totally do it even if it sounds like crap on an emulator.
Quote from: andycadley on 18:16, 04 November 21Stuff like this is what pushes the envelope of emulator development. Such as Chromatrons Attack on the Speccy, which relies on weird quirks in the PAL signal to generate an image. Initially didn't look right on emulators at all, but a few of the more advanced ones can now pull it off and, as a result, can do a better job of rendering all software.
Quote from: cpcitor on 12:58, 05 November 21Arnold: some noise, but the cleanest spectrum so far. You can see the hyperbolic shape of the first harmonic (yellow curve) and second harmonic (orange curve on top right). Spurious frequencies are much weaker and only at high frequency (2.5+ kHz). Open to other measurements, thanks!
Quote from: roudoudou on 15:18, 05 November 21Here is captures of CPCEmu_Power Linuxhttp://www.roudoudou.com/export/cpc/temp/cpcemu_power_44Khz.wav (emulator and recording @44KHz) http://www.roudoudou.com/export/cpc/temp/cpcemu_power_192_to_44Khz.wav (emulator @192Khz output + record @44KHz)http://www.roudoudou.com/export/cpc/temp/cpcemu_power_192Khz.wav (emulator and recording @192KHz)
Quote from: eto on 15:21, 05 November 21Schneider 6128 - early and late modelAmstrad 6128 plusRetroVm - 2.0 beta 1 r7https://www.dropbox.com/s/c094rb9yuquznex/soundtest.zip
Quote from: Bryce on 16:12, 05 November 21Just for correctness. The orange curve is the third harmonic not the second: 1st = Fundamental frequency (f), 2nd harmonic = 2f, 3rd harmonic =3f and so on.Bryce.
Quote from: cpcitor on 23:25, 05 November 21Can you describe the recording setup a bit better?Hearing them, I find them between cpcec and caprice32, closer to caprice32. Visually they look closer to cpcec.
Quote from: cpcitor on 16:27, 04 November 21I'm considering some advanced signal processing tricks to play unusual audio on the CPC.
Quote from: BSC on 00:06, 06 November 21Great topic, looking forward to hearing your tricks at play. Also thanks for the additional links, I am always happy to learn more about (the endless realms of) digital audio.
Quote from: cpcitor on 23:30, 05 November 21Oh, RetroVm is really good!I reproduced it here, and it performs proper low-pass filtering! Youhoo! Congratulations to authors of RetroVirtualMachine!
Quote from: roudoudou on 09:25, 07 November 21RetroVm has a very bad replay with SID sounds. This may be due to an overall bad emulation, but hey, as we dont know what is inside the emulator... can state about it
Quote from: cpcitor on 14:31, 06 November 21And if the only gain of this thread is that mainstream emulators "align to the top", that is get a sound much closer to a real CPC sound, it's already worth it. :-)In the meantime you can enjoy this tune https://www.youtube.com/watch?v=qgjRwBQzJss apparently playing on the YM2149 variant of the chip, on a Atari ST, a chip very similar to our AY8912 ( https://maidavale.org/blog/ay-ym-differences/ ). The CPC probably cannot do exactly this due to slower clocks, but I still think there are some things to explore.
Quote from: cpcitor on 00:06, 08 November 21RetroVM can emulate a SID? And even so, this does not affect AY emulation, right?That said, I agree it's closed source so it's evil .Anyway, capture from RetroVm and show waveform in e.g. audacity, it shows the Gibbs phenomenon that typically results from low pass filtering.So, it sounds like low pass filtering, it looks like low pass filtering, and it is exactly what is needed, so ... it would be even better open-sourced. ;-)
Quote from: roudoudou on 08:02, 08 November 21i'm talking about some SID sounds a CPC or a Plus can do* with FAST volume switching. Timing accuracy is more important than if you play a music with a 50Hz player routine. So yes, global emulation may change the sound replay
Quote from: roudoudou on 08:02, 08 November 21*Like CRTC3 demo or KillMax demo
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