Displaying 20 results from an estimated 1000 matches similar to: "Floor1 X axis frequency units?"
2009 Aug 21
1
Floor1 encode/decode and FLOOR1_fromdB_LOOKUP
Hello,
I have two questions concerning floor1 encoding/decoding. First I'll ask
about the FLOOR1_fromdB_LOOKUP table: what is it's purpose? Is it to convert
the amplitude differences between [floor1_Y] values to a dB scale? And, if
I'm right with that, here comes the 2nd question: when render_line0 is used
to encode floor1, then floor1_inverse2 must be used in decode (in order to
2002 Sep 12
1
Floor1 header decoding
Hi,
is there an error in the last part of the algorithm describing how
to read a floor1 header? According to point 18 and 19, the vector
[floor1_class_dimensions] must have at least [floor1_partitions]
elements, but when reading/computing these two values on the beginning
of the header, they are not related to eachother, and my attempts
to apply this algorithm to real ogg-files gives me
2001 Aug 16
2
bug in rc2: floor1.c
Hello,
There is a bug in the current version of vorbis/lib/floor1.c.
The line that says:-
qsort(sortpointer,n,sizeof(int),icomp);
should be:-
qsort(sortpointer,n,sizeof(int *),icomp);
But somebody probably fixed that already. :)
Also, I'd like to know how I can encode a file using the channel
coupling modes. oggenc doesn't have an option for that yet.
Greetings,
2009 Nov 11
1
Floor1 doubts...
Hello,
I've read in a thread from this mailing list (
http://lists.xiph.org/pipermail/vorbis-dev/2009-September/020019.html) that
the usage of FLOOR1_fromdB_LOOKUP table is to convert Floor1 values from a
dB scale to a linear scale. In a dB scale, given a reference value, the
other dB values are obtained from it, normally dB_value = 10log(p1/p0),
where p0 is the reference value. Supposing p0
2007 Feb 11
7
Could not find definition vico_network
I''m trying to manage network files on two nodes, "vico" and "backup."
The component "vico_network" below works fine.
define vico_network ($owner = ''root'', $group = ''wheel'', $mode = ''644'',
$cro_int = ''ne3'',
$carp0_skew = '''', $carp1_skew =
2009 Sep 16
0
How floor1 modifications may affect final (de)coded samples?
Hello,
I've been "playing" a little with the floor1 encoding, and my game has posed
me a question. I've been modifying (just curiosity) manually, and randomly
(not too great modifications), the quantized [floor1_Y] values, just before
coding them with the codebooks. As, if I'm not wrong, the [floor1_Y]
obtained are then removed to get the residue vectors for each channel, I
2009 May 31
0
Bit allocation dependetnt on masking threshold and floor1 inverse dB lookup table
Hi,
We are two students doing project with Vorbis audio compression for our B.Sc
studies.
We have two questions:
Our first question related to the floor1 inverse dB lookup table.
As we understood the floor values encoded as offset integers (Y) from 1 to
256 and then used as index in the floor1_inverse_dB_table to get an
encoded value. This value (denoted as X) is inverse of linear frequency so
2001 Oct 12
2
FLOOR_fromdB_LOOKUP
Hello,
You know, I always worry about the precision
and the float constants... and there is a large
lookup table in the floor1.c ... and I figure out
a way to keep the code size and speed, but
to improve the precision at this lookup table.
(the difference is small, but audible)
Here is the modifications in the floor1.c:
tatic unsigned long FLOOR_fromdB_LOOKUP[256]={
2002 Aug 13
1
Specification documents
Hi everyone,
after having an extensive look at the reference decoder as well as the
specification documents, I'd like to point out what I think to be some
minor omissions/flaws in the latter, and suggestions for correcting them.
---
#1:
in vorbis-spec-floor1.html, packet decode:
Between 14) and 15) a crucial step is missing. Please insert:
14a) [cval] >>= [cbits]
----
#2:
in
2013 Jul 26
0
[LLVMdev] floor
Here is a test case:
extern double floor(double);
extern double floor_(double);
double x = 1.5;
double y, y_;
void foo() {
double y = floor(x);
double y_ = floor_(x);
}
If I compile this for Mips16, it calls the proper helper function for
floor_ but not for floor, because the signature for floor in callee info
is wrong. Args[0] = void RetTy = void
2009 Aug 16
1
VQ and Huffman codebooks creation
Hello,
I'd like to know in detail how does the creation of VQ and Huffman codebooks
work in Vorbis. I've used the source code from *encoder_example* as guide,
but the only reference I've found is the function *_make_words *inside *
vorbis_book_init_encode*, which creates the Huffman tree if I'm not wrong.
So I have two doubts. The first is that, for creating the Huffman tree (and
2010 Feb 11
3
Excessively inefficient source code modifications
Hello,
I've made some changes in the libvorbis-1.2.3 source code to introduce
some functionality I need for a project I'm working on. For compilation,
besides including some macro definitions I need to pass to the C
preprocessor, and linking with the math library somewhere (and including
the source files I've implemented, of course) I've made no big changes
in the Makefile or
2006 May 31
2
Frequency range carried by speex
I've looked around and not found details on the expected frequency range the
Speex codec can be expected to carry. Is there any documentation available
or a table of some sort that has been compiled which would give an
indication of the frequency range based on the various compression options
in speex?
Best regards,
Baldvin Hansson
Reykjavik, Iceland
baldvin@baldvin.com
-------------- next
2003 Mar 25
1
problems with beta4 encoder
Hi,
Am trying to run beta4 encoder on a Sun machine. Want to compare floor0
and floor1. Do not have autoconf and automake.
Got the encoder to compile with a simple makefile. The only define i am
using is NO_FLOAT_MATH_LIB.
The encoded file when played(winamp) gives out plain noise. Am i
missing any other flags/defs?
-Cathy
<p>---------------------------------
Do you Yahoo!?
Yahoo!
2013 Mar 19
2
Min and max cutoff frequency
Maybe Monty will make a video about it one day and we will all understand
it. ;-)
Silvia.
On Tue, Mar 19, 2013 at 3:22 PM, Benjamin Schwartz <ben at bemasc.net> wrote:
> Presuming that you are asking regarding the Ogg Vorbis audio format, the
> correct answer is: there is no minimum or maximum cutoff frequency. Vorbis
> can code all frequencies from DC to Nyquist. What Vorbis
2013 Mar 18
2
Min and max cutoff frequency
Dear list,
Could you please tell me the values of the minimum and maximum cutoff frequencies for each coding version of the 44.1 kHz sampled data? For instance, are the values fmin=100 Hz and fmax=12 kHz valid?
Thank you very much in advance.
Kind regards,
?
Fernando A. Marengo Rodriguez, PhD
Post-doctoral fellow on Acoustics and Beamforming
--
Laboratory of Noise and Vibration (LVA)
Federal
2014 Mar 20
2
BARK implementation (or specification) error
Hi,
In the course of some work which I describe below, I have found a very significant difference between the BARK function described in the Vorbis specification and its implementation in libvorbis.
In the specificationhttp://xiph.org/vorbis/doc/Vorbis_I_spec.pdf
bark(x) = 13.1arctan(.00074x) + 2.24arctan(.0000000185x**2 + .0001x)
In the libvorbis code
2009 Jul 16
1
Square Polar Stereo Coupling
Hello,
I've read http://xiph.org/ogg/vorbis/doc/stereo.html and the Vorbis specs,
but I haven't got a clear concept of how does the Square Polar Mapping
works. I mean, in the "Ogg Vorbbis stereo-specific channel coupling
discussion" document, it's described how the decoupling process works for
Square Polar Mapping (and it is fairly clear explained), but it does not
describe
2009 Aug 04
1
Vorbis psychoacoustic model
Hello,
I'd like to know there is any place (web, document...) where I can see which
the vorbis' psychoacoustic model is, at least for the reference encoder (how
it works, algorithms, filter banks, scalefactors, etc., or if it doesn't use
any of this things at all...), or if the only way of looking at it is within
the psy.c. I've been looking for it in the Vorbis' site and in
2003 Aug 08
3
where to get vorbis files with all configuration the spec support
Hi
According to vorbis I spec, there are several configurations. There are 2
formats of floor, 3 formats of residue and 3 look up types of VQ codebook,
etc. I think to get all kinds of vorbis file with these configurations but
what I have got from network only support some of the formats (Ex. floor1,
residue 1 & 2, VQ lookup type0 & 1). I downloaded several freeware vorbis
encoder