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| Nom: | vorbis synthesis read |
| Format: | Fichier D’archive |
| Système d’exploitation: | Windows, Mac, Android, iOS |
| Licence: | Usage Personnel Seulement |
| Taille: | 7.31 MBytes |
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Moderator comment Currently the Vorbis patent issue covers these threads: Is this position changed now, or does it still stand?
And I believe that Vorbis window function also satisfies this, otherwise it wouldn’t be perfect-reconstruction filterbank. Claim 1 from patent US High-level Decode Process Synrhesis seems that the Vorbis specification itself gives the answer about the window function, see 1.
I’ve already said everything I’m qualified to say. When there are details, you’ll hear about them then.
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Well, at least there is a nice bunch of voebis data about US that needs to be proven as not relevant – altough I believe that most claims of the patent are probably met in a nice way Of course Everyone interested can view the patent: Yes, Claim 4 is not easy to avoid.
Claim 6 points back to Claim 2, where again the issue of changing signal amplitudes is mentioned.
Hmm, but Claim 4 points back to Claim 3, which points back to If presented with the vorbis code and possibly an explanation of its operation and a certain patent, I would find it very hard to make any judgement still, due to the language used in patent documents. I took a deeper look at the patent – It seems that this patent does not talk about vorbks criteria at all – they just state ‘signal amplitude corbis as a condition for switching to the short blocks, which is met in every codec, regardless of the actual switching method – otherwise there would be no point in window switching at all if energy level is the same.
Vorbis development, status & patent issues
On page 6 they suggest that signal amplitude change of a given magnitude could be used as a trigger – but they do not state whether this is in time or freq domain – it can be both. Window switching criteria can be either time-domain energy diff, freq domain energy diff vorbis is using this, right? That’s why they stated « signal amplitude change » only, because this is the reason for block switching in any case – no matter how you look at the signal as I already explained in my previous post.
Dolby AC3 uses other time-domain block switching method which might be patented but I am not sure. Doesn’t Parseval’s Theorem say that frequency domain energy is equal to time domain energy?
Even if Vorbis does the energy calculation in the frequency domain on a specific frequency band, there are ways to do the exact same in the time domain, making it a direct shnthesis of the amplitude changes. A frequency domain representation is just a different way of presenting the signal, it is still the same signal.
I find the statement « function of changes in signal amplitude » a bit strange. A signal itself is fully defined by it’s amplitude changes, meaning that every method of using the signal for the switching is covered, unless you use just 1 sample. Or am I missing something stnthesis