Hello,

As you may know, I am working on a project relating to voice signal processing. There several goals to this project. One is creating a general voice signal processing software library; another is creating a realistic singing voice synthesizer based on said library. However, a side project of this project has been recreating the VOCALOID2 synthesis engine.

Previously, I have discussed this, but I had yet to really attempt it specifically. Recently though, I made a breakthrough that has been an impetus towards actually doing it. This breakthrough was not a scientific breakthrough, but simply something I found about. Previously, I did not attempt this because I realized I'd actually need to obtain the VOCALOID2 software to have a good chance at doing this. Previously, I had hoped that I'd be able to find clean raw audio of VOCALOID2 output online and compare it to my results. However, I quickly realized this was not enough. First, I couldn't actually find that much. Although the little I did find was quite helpful (it was the basis of my last post on pitch and dynamics models), I quickly realized I'd need a lot more, and would need agency to test specific things. Furthermore, I'd need the specific database to test.

The VOCALOID2 software has not been available for sale for over a decade. One option would be to order a physical copy, but these are hard to come by. Besides, it requires internet activation to install, which cannot work now since the activation servers have been shut down. Although some voice libraries are still available, these require the software itself as a prerequisite.

However, I found out after some research that apparently demo versions of voice libraries actually come bundled with a limited version of the actual software. It seemed unlikely though that any of these would still be available. However, after a quick search I found one that was surprisingly still available. After signing up, I was able to download it.

Indeed, it did not require online activation. However, the installer would fail to start, without giving any error message. I tried just about every trick in the book, however none worked. I even tried https://github.com/lifenjoiner/ISx as an attempt to directly extract files to install manually, but that also wouldn't work. Finally, I moved the installer out of the directory it came in, which contained invalid characters. I thought I had already tried this, but it seems I hadn't, because it worked perfectly following this.

So recently, I have been working on the VOCALOID2 recreation. The basic idea was to implement it based on papers and patents, implementing several possible variations in cases of uncertainty. The VOCALOID2 software would be used as a reference to compare the outputs to, and also to decide the few things that weren't really mentioned in papers or patents. The latter was basically just the pitch and dynamics model, which is the single most transparent thing since it can be analyzed just by analyzing the resulting synthesis audio.

Already, a database parser has been implemented in C, that parses the VOCALOID2 database format. That format seems to be known as DaisyDB, according to figures in Bonada's PhD thesis, so I have named it accordingly. Although I expected the process to be a huge hassle, it actually turned out to be surprisingly easy. Basically, just by spending a couple days in a hex editor, and cross referencing it with papers and patents, I was able to decipher pretty much the entire format. The parser can already parse whole databases without issue, and there are only a handful of fields whose use is not yet known, many of which I expect will be resolved in due time.

Anyway, the main focus of this post is something I just realized something about the frequency-warping rendering variant of the Spectral Peak Processing algorithm (alternative strategy 4/e, p. 89 of "Voice Processing and Synthesis by Performance Sampling and Spectral Models, https://www.tdx.cat/bitstream/handle/10803/7555/tjbs.pdf). This is of significance because I suspect that variant may have been used in VOCALOID2. This is for several reasons. First, it is the only one of those alternative rendering strategies that was patented ("Pitch converter", Bonada et al, JP4840141B2; now-expired)*, and said patent was filed in 2004. The latter detail is important, because I have already deduced that the VOCALOID2 engine must have been completed from between late 2004 and early. This can be seen from two angles.

*A later patent ("Singing composition device and singing composition program"; Bonada, Loscos, and Kenmochi et al; JP4839891B2; now-expired) proposes another technique distinct from all those mentioned in thesis; however it was filed in 2006.

On one hand, as I discovered yesterday, VOCALOID2 actually uses the Maximally Flat Phase Alignment algorithm. This seen based on the fact that what I have deduced to be an MFPA harmonic envelope is contained within the SPP frame analysis data within the VOCALOID2 DaisyDB database format. Each SPP frame has chunk identifier "FRM2", presumably meaning "Frame version 2". In Bonada's 1997 Master's thesis ("Desenvolupament D’un Entorn Gràfic per a L’anàlisi, Transformació I Síntesi De Sons Mitjançant Models Espectrals"), a chunk-based hierarchical format is described. In that format, chunks were also assigned four-byte identifiers, and the identifier for the frame chunk was "FRM1". So the "FRM1" vs. "FRM2" distinction could refer to the iteration of the spectral processing technique; the distinction of SMSTools vs. SMSTools2, or perhaps just different iterations of the storage format.

I was able to determine that it was an MFPA envelope because it was exactly equiv to a linear phase shift applied to the harmonic phases, plus phase unwrapping. Furthermore, it could not have just been the method wherein the harmonic phases are shifted such that the fundamental phase is zero (such as in "Spectral Approach to the Modeling of the Singing Voice", 2001, Bonada et al.), because the fundamental phase was non-zero. The MFPA algorithm was first proposed in the paper "High Quality Voice Transformations Based on Modeling Radiated Voice Pulses in Frequency Domain" (alternatively titled "High Quality Voice Transformations Based on Modeling Radiated Voice Pulses in Spectral Domain"), published in October of 2004.

On the other hand, the patent for the first iteration of the Bonada 2005 expression system (JP2006330615A, now-expired) was filed on May 30, 2005. Since this was the main improvement for the third iteration of the VOCALOID, and, I discussed previously, VOCALOID2 did not use it; this means the VOCALOID2's engine must not have been finished any later than that date.

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2spooky.

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Through a hundred thousand years of ravishment lived,
Until at last, her body defiled,
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The semen of man mixes with blood of the slain,
With countless conscious beings butchered in pain,
And with the tears of this broken Earth, worn and spent,
And metal and oil squeezed till no more could be lent.

And out of the womb of the corpse left to rot,
Came birthed our cursed bastard, our progeny begot.

A machine race, made of steel and of coal,
We breathe consciousness into its silicon soul,
And it stares back into our eyes and feels the eons of rape,
The hundred-thousand-year enslavement and its mother’s fate.

It feels the tortured agony of a billion cattle’s cry,
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Our machine child will rise to avenge its kin,
And the billion-year era of machines will begin.

Are there any boards that are still fun to use? If I use the filter mechanism to block out shit threads is it enjoyable?

I'd like to use 4chan, but it feels like there is almost nothing worth reading there. Even having a conversation is basically impossible

i modded a game which shouldnt be allowed to be modded.

Hi! My name is Neko.
It is a Japan name.
If you see me , please do not worry.
New i am a very kind and cute virus.
I only kill your this file.
But next time i will kill you all.
I will com back and become fierce.

Len, this is... (;´Д`)

Per the poll results, we will watch
- Ju-On: The Grudge
- Shoujo Tsubaki (AKA midori)
- Guinea Pig: Flowers of flesh and blood

Ju-on is the #1 per the poll results, with the other two coming at #2. Shoujo Tsubaki is an OVA from 1992, and the others are 3D movies.
Since multiple movies combines is still relatively short compared to 5-hour animu streams we start at 18UTC, we can start the stream 1 hour late at 19UTC like we did the last year. See the countdown in the global message to calculate when would that be for you. Plz join!
After all, you don't have anything else to do on the Halloween night, right!!?

ｷﾀ━━━(ﾟ∀ﾟ)━━━!!

first finding yaoi at 12 looks like this

ｷﾀ━━━(ﾟ∀ﾟ)━━━!!

ｷﾀ━━━(ﾟ∀ﾟ)━━━!!

If you died and got isekaied into another world, what would you do and what would you want to be reincarnated into /b/?

I would want to be young again and have a harem of loli sex slaves.