Displaying 15 results from an estimated 15 matches for "bolc".
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bloc
2005 Sep 25
3
several questions
VorbisHi
Any help is appreciate.
I have two questions.
First, I looked into the vorbis-?-specific and was confused by the floor1 algorithm.
I think at last the aim is to derive the piecewise curve with the list X and Y,then when encodering ,why not
use the selected point orderly to get the curve ? In other words, the specific use the list of [0,128,64,32,96,16,48,80] ,
why can not use
2005 Sep 05
1
Floor Generation
Hi,
Can any one explain me basic concept of Floor
Generation in Vorbis encoder?
Ravi
__________________________________________________________
Yahoo! India Matrimony: Find your partner online. Go to http://yahoo.shaadi.com
2005 Sep 13
1
Floor 1 Decode
Dear All,
Floor 1 decoder uses FLOOR_fromdB_LOOKUP table. The purpose of this table
is not clear to me. It is also not explicitly explained in the vorbis
specification.
As i have understood is that it is used to dequantise the "Y" values
which are decoded from the bitstream during curve synthesis. Is this
correct ?
If so why does the table have only 256 elements ? This would imply
2005 Sep 23
1
***SPAM*** help
vorbisHi
Sorry if it is too stupid to ask the following questions.
I am just confused by the pychoacoustics model. I think the computation in the psy.c is to
derive a curve which stands for the threshold for the mdct coefficient. Is it right ?
If it is right , then what can we do with the curve ? I refered to several articles and find the aim of
most pychoacoustics model was to derive the SMR
2005 Sep 27
2
***SPAM*** encoder flow chart
Hi
Any help is appreciate!
These days I studied ogg vorbis encoder with sample rate 44.1kbsp,and I thought the whole chart was as follows:
1. read the PCM data and store them in a buffer
2. do MDCT on those PCM data
3. do FFT on those PCM data
4. use both the FFT and MDCT coefficient to the psychoacustic modle and derive an maximum allowable noise curve,
and during this curse ,do the
2005 Sep 29
2
stereo couple
Dear All:
I studied the stereo couple documents and now confused, I wonder
why it can be done like that, and what is the principle behind that.
I think i am confused perhaps because i have no background knowledge,
can you help me out?
Also, when doing the T/F transform,we used MDCT, so it means no imaginary part.
And i am much puzzled about the angle in the stereo couple,what does it mean?
2005 Oct 29
1
***SPAM*** pre-echo preventing
Hi!
Dear all
I compressed an audiu(wave) with libvorbis1.1.1 and found that the pre-echo was longer
than the one which was compressed with MP3 at the same bitrate(128kbps),I am now
confused aboout the pre-echo preventing scheme.
Can you tell me what method does Ogg Vorbis adopt besides the auto windowsize switch?
Looking forward to your letter!
Thank you!
??????? Lisa (^_^)
2005 Aug 17
1
Reg. vorbis_staticbook_unpack
Hi,
All help is appreciated.
I am looking at the function "vorbis_staticbook_unpack" in codebook.c
I guess this function just reads the codebooks in some structure
(static_codebook) and does not actually map the codewords to the
codevalues.
Does anyone know what functions can I use in this function to actually
view this mapping? I just want to display something like below: I can
2006 Mar 30
2
Split an audio in more part (not time based) and recreate the original
Hi all,
I would like to split an audio stream into more encoded flows (for
example 1, 2 and 3). This division isn't time based (Maybe frequency
based).
The substreams that have these features:
1) The flows must be re-assemblable and must generate the original
stream (1+2+3 = original stream)
2) I can listen only the flow number 1 (even if the audio quality is
worst than the original, of
2005 Sep 13
1
Clarification on code books usage.
Dear All,
As i have understood it , the Huffman codebook uses a huffman code
present in the bitstream ( lets us say it is decoding a floor 1 Y value
using the specifed codebook number ) to walk through the huffman code
book tree till it hits a leaf node which is nothing but the entry number.
If we consider our floor 1 Y value example , this entry number is
directly being used as the Y value.
2008 Sep 16
3
How to do Clustered Standard Errors for Regression in R?
I can't seem to find the right set of commands to enable me to do perform a
regression with cluster-adjusted standard-errors. There seems to be nothing
in the archives about this -- so this thread could help generate some useful
content.
I've searched everywhere. Can anyone point me to the right set of commands?
An example would be most helpful as well.
Bo
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2006 Jun 09
4
c++ Wav->ogg encoder
Hi
I'm new with ogg and also with using third party libraries. I'm making a
C++ PocketPC program and I need a simple wav->ogg encoder function. But as
I have tried to use ogg vorbis libraries I don't know what or how to use
them.
I think that best way would be to use libogg 1.1.3 and libvorbis 1.1.2. Do
I even need both of them, since I only need to have capability of
2006 Feb 20
3
Huge VQ codebooks
Hi,
Does anybody know how codebooks are generated in OggVorbis encoder? We
are porting oggorbis encoder on embedded platform for which VQ codebook
memory is hugeeee to imagine. How can we reduce that? Can we do VQ with
less codebooks and if yes how? If any help available?
Parul
Embedded Engineer
Einfochips Ltd
2005 Aug 01
4
Input buffer requirement.
Hi all,
I am in the thinking phase of Vorbis 'file' to 'buffer' conversion.
ie, accessing the stream data from the static buffer, rather than
accessing the file from the decoder( the way it is implemented in the
vorbis decoder).
I am putting my understanding and the respective query below,
As the general convention , there are two methods by which i can do this.
1) Assume what
2007 Jan 18
16
5.1 surround channel coupling
It obviously would be nice to have such a mode available, for e.g. DVD audio
compression. Apparently, the list doesn''t tell me too much about it. My
questions are:
1. What is the current status of the 5.1 channel coupling in Vorbis?
2. If I''ll be interested in participation in its development, what is the
recommended reading?
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