Displaying 5 results from an estimated 5 matches for "sandval".
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2004 Mar 11
2
Ogg/Vorbisreport, FFT optimizations
I wrote to the list earlier about optimizations of the
tremor. Specially replacing the IMDCT with a N/4 FFT.
The report is available here: http://www.sandvall.nu/thesis.pdf
Short summary:
Optimization of the Tremor code under 50kB for a "split" decoder version.
~44 MIPS. Huffman highly unoptimized. IMDCT ~ 8 MIPS.
Quick overview of the Ogg/Vorbis format and a psycho acoustic
introduction.
I've send code to the list about the FFT but that...
2003 Dec 08
2
Encoding, documentation, questions
...coding process but not with the encoding part.
Is there any documentation explaining the different steps during
encoding?
What I'm looking for is a list of encoding steps, very briefly
explained and more details on a few fundamental steps, like VQ and
codebook selections.
Regards,
/ Johannes Sandvall
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2003 Oct 24
1
Test .ogg files
...chive with a collection of different .ogg files encoded
with different settings that can be used to verify compatibility?
* Different window size (e.g. != 256,2048)
* Much larger codebooks and other extreme cases that are not generated
using a standard encoder.
* floor0
Regards
--
/ Johannes Sandvall
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2004 Feb 05
1
Psychoacoustic model
...se?
Tone masking noise?
Noise masking tone?
Temporal masking?
Other aspects of decoding:
Are the codebooks fixed for VQ encoding and huffman for a given
quality?. Adjustments of VQ codebooks based on the audio or picking
a fixed codebook that minimizes the quantization error?
Regards Johannes Sandvall, Erik Montnemery
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2004 Mar 28
3
Optimizing Vorbis for a DSP
Hello all,
I have recently ported Vorbis to a Texas instruments DSP (TMS320C5510), The problem I have is that it is not decoding the audio in real time( about 50% of real time). Could any one give me a clue in which area I could start to optimize the code.
Regards
Kevin
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