Displaying 10 results from an estimated 10 matches for "directbox".
2004 Oct 06
4
Checking if an element is part of a vector
Hi!
I want to know if a given element <- ('c64') is part of a vector<- ('c64', 'amiga', 'atari').
Does a function exist for this which gives back a logical value?
thankx
db
1995 Nov 14
1
Vorbis Codebooks
Hello,
Vorbis uses codebooks, for example to do vectorquantization and huffman-encoding.
My question is - are all these codebook dynamicly generated ("trained")
or are there also static codebooks used ?
If yes, what specific tasks are these 2 types used for, during encoding ?
Thanks
Stoffke
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Ogg project
2003 Mar 05
1
Questions about window sizes
Hello,
I have a few questions about the block size in ogg vorbis
1. The allowed blocksizes are powers of two between 64 and 8192 Samples.
As I understood , there are fixed sizes for long and short blocks .
The encoder can pick any allowed value for long blocks and onother value, that must
be smaller or equal to the first one, for short blocks.
On which base does the encoder choose the size for
2003 Mar 12
2
encoder block diagram
I've made a block diagram of the encoder because I tried to find out, how it works
http://stoffke.freeshell.65535.net/ogg/block.html
Although there are specifiation docs, that give very
detailed information about single aspects of the encoding (or decoding) ,
I'm missing documenations that give a more general overview,
about how the encoder works.
(Vorbis Illuminated seems a bit
2003 Jan 24
8
just an idea about quality evaluation
Hello
I had an idea about judging the quality of ogg vorbis
(or any other lossy codec)
I took a wave-file and encoded it to ogg.
Then decoded ogg to wav and inverted it's phase. When mixing the original
wav with the phase-inverted decoded ogg-file, any identic parts of compressed and uncompressed audio should be eliminated.
Of course there's always a "rest" of sound because
2002 Sep 09
1
psycho-acoustic model in ogg vorbis
I wonder what psycho-acoustic model is used in ogg vorbis.
Did they create their own model (this requires big listening tests) ?
Or is it something that was already there, like gpsycho ?
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2002 Nov 26
1
floor curve question (whitening filter)
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one step in the encoding process (if I got it right), would becomputing a "floor
2003 Mar 14
0
encoder block diagram
I've made block diagram of the encoder because I tried to find out, how it works
http://stoffke.freeshell.65535.net/ogg/block.html
Although there are specifiation docs, that give very
detailed information about single aspects of the encoding (or decoding) ,
I'm missing documenations that give a more general overview,
about how the encoder works.
(Vorbis Illuminated seems a bit outdated,
2002 Oct 22
3
Spectral phase information in residue vectors
I found this sentence in the Ogg format specs:
http://www.xiph.org/ogg/vorbis/doc/vorbis-spec-res.html
"A residue vector may represent spectral lines, spectral magnitude, spectral phase or hybrids as mixed by channel coupling."
But where does the spectral phase information come from ?
AFAIK MDCT doesn't provide any phase information.
And in OGG-encoding, MDCT is taking place a few
2003 May 22
2
square polar mapping - backgrounds
Hello,
I wanted to find out more about square polar mapping, cause that whole
stuff is a bit tricky - to me - and not so easy to understand.
Searching the web did't get me any results, so I wonder what the background
of square polar mapping is.
Is it derived from some mathematical publications or just the result of a brilliant
intuition of a Vorbis programmer ? ;)
Thanks.
Stoffke