05 June 2024, 23:49 | #101 |
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06 June 2024, 00:02 | #102 |
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06 June 2024, 19:31 | #103 |
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Hi Saimo, exactly as you requested: https://eab.abime.net/zone/For_Saimo_2.7z
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06 June 2024, 23:20 | #104 | |
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I didn't consider smaller periods as I can sample at most at 192 kHz (and period 37 gives a frequency of about 96 kHz, which is already overkill). Also, I used a 1000 Hz sinus tone sampled at 55420 Hz, as it looks like the 13855 Hz square tone was hard for Paula to digest (but I didn't really investigate further). Well, apart from a few hiccups (especially at the smaller periods), it turns out that Paula does a pretty good job (although not perfect) at regulating the volume (as usual, click the pictures to see them in full size): samples and pictures download Finally, I have added volume and filter command line options to the sAQAx players. P.S. I have removed the files I had previously uploaded as they were cluttering the server and were obsolete anyway. EDIT: I also fed the modified player the Sony music snippet and it worked very well; I didn't include it here and in the archive as at first I thought that it was more a curiosity than else; but now I regret it Last edited by saimo; 06 June 2024 at 23:34. |
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06 June 2024, 23:25 | #105 | |
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07 June 2024, 13:43 | #106 | |
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@pandy
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For practical reasons (i.e. floppies swapping - I have a Gotek, but still...), I have used only the last 7.5 seconds. For comparison, I also exported the same chunk with Audacity. Results: Code:
Audacity = made with Audacity 8/14/16 = 8/14/16-bit ND = No Dithering SD = Shaped Dithering sampled = Amiga 192 kHz sampled output 8-bit: BeeMoved_2requant_ssstrong64k-sampled: -1.910 dB, clearly audible fine noise BeeMoved_improved-e-weighted-sampled: -2.235 dB, audible, but weakest noise Audacity-8-ND-sampled: -0.942 dB, strong rough noise Audacity-8-SD-sampled: -0.928 dB, strong rough noise, comparable to Audacity-8-ND-sampled 14-bit BeeMoved_2requant-sampled: -2.364 dB, barely audible noise Audacity-14-ND-sampled: -0.913 dB, barely audible noise Audacity-14-SD-sampled: -0.935 dB, a bit more audible noise samples download I'm more and more convinced that, in general, the best solution is either 14-bit without noise shaping, using 55420 Hz sampled rate instead of 64489 Hz (thanks to the absence of noise shaping), or AM 8-bit samples at 55420 Hz again. For the demo I'll stick to the crazy 14-bit 70937.9 Hz, as yesterday's tests showed that Paula handles graciously a volume of 1 at that frequency, but I really think that AM should be explored... @Karlos If I understand correctly, you happen to have (since a long time) a ready-made converter that produces AM data - is that so? Is it public or, if not, could you simply convert a file so that I can check the resulting on the A1200, please? |
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07 June 2024, 19:33 | #107 |
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@saimo
Just this: https://github.com/0xABADCAFE/paula-hdr which just contains simulation of the mechanism (it's also intended to compile on generic linux) However, @paraj posted an implementation in the thread earlier that does it all, runs on an amiga and includes a reference paula output implementation. |
07 June 2024, 21:29 | #108 | |
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07 June 2024, 22:04 | #109 |
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07 June 2024, 22:10 | #110 | |
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I just tried it (after compiling it with VBCC) on WinUAE. For some reason the playback is slow (at first I had erroneously used a stereo sample, but then a mono one didn't fix the issue). Anyway, no worries and no action required - I just dropped these lines for acknowledgement and feedback. I was just hoping to be able to make a quick and meaningful test with AM, but for my player I need a suitable converter, so I'll write one sometime tomorrow or in the next few days. |
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07 June 2024, 22:14 | #111 |
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Guess what? Only now I noticed (consciously, at least) your avatar. That game's baddies and bugs and code and algorithms and mods etc. must be visiting you in your sleep quite often
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08 June 2024, 16:17 | #112 | |
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08 June 2024, 18:21 | #113 | |
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Last edited by saimo; 10 June 2024 at 23:32. Reason: Fixed broken English. |
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08 June 2024, 18:29 | #114 | |
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08 June 2024, 18:42 | #115 |
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Ah, alright. I'm so used now to making tests with stupidly small periods that I just typed commands away in the shell without thinking
(Strangely though, with the sample you included the playback does get sped up with 55 - but I didn't time the duration). |
08 June 2024, 20:36 | #116 |
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The little endian stuff is just an artefact from prototyping the original code on x64, there's no algorithmic necessity for it.
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08 June 2024, 21:59 | #117 |
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10 June 2024, 15:25 | #118 |
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Having improved the converter and having improved the music mix, I'm about to release an updated version of the demo.
Before doing that, though, I made one last test to double check how Paula copes with volume 1 at period 50 (the one used by the demo). What my limited means report is that Paula does indeed a very good job (click for full size): test tone download Also, the outcome is quite fine to the ear, so the updated demo is going to be out soon. |
10 June 2024, 19:39 | #119 |
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... and now it's released. As anticipated, the music is better now - which is quite relevant for a music-centric demo
CHANGELOG v1.2 (10.6.2024) * Improved streamed music: made arpeggio and strumming guitars stronger in the mix; managed to eliminate some more peaks, thus exploiting more the resolution and increasing the overall quality; made an overlapping solo guitar enter from the middle-left and then move to the center gradually; converted data with an updated and more precise custom converter. * Increased the volume level of the arpeggio guitar in the tracked music. * Improved a few pixels. * Extended and fixed manual. https://www.retream.com/Hertz_Overload / https://retream.itch.io/hertz-overload [ Show youtube player ] |
10 June 2024, 20:03 | #120 |
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That sounds great, but I can only hear it via YT, so I'm not getting the true experience.
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