Man on the corner
Finally updated my site a bit, to reflect my current situation. First, I graduated, with a nice mark. So now I am a master of science (the name implies more control over the universe than you have in reality ;-). Further I updated my CV. People who are interested in this, can download my latex sty file and my cv latex file, to come up with a PDF with the same layout as my curriculum vitae.
Also I plan on releasing some of my bash script files, currently I am working on ralbum a small utility to play random albums from my music collection.
[Permalink]-- Filed under: [personal] [linux] [science]
The last time
My graduation is now on 29 augustus instead of 22 augustus. My final report can be downloaded from this location.
More information when I am less busy ;-).
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In joy and sorrow
Vorm.net was down for a week. My apologies.. I was on a holiday in Leiden, and left my server with a missing configuration file.
Nevertheless I had a nice week with lots of sun, a good excavation and kind young people who are hopefully now better archeologists. Pictures of this week can be found in the NJBG photoalbum.
[Permalink]-- Filed under: [personal] [holiday] [photos]
Graduation
In january 2002 I started graduating at the TU Delft. I obtained my degree in August 2003. My study was Applied Physics, my group works on Acoustics.Mostly all research carried out within the group deals with array technology. Main research topics are spatial sound reproduction, based on the concept of Wave Field Synthesis (WFS) and microphone array technology for the directional recording and analysis of audio and noise.
Transform coding of audio impulse responses
The goal of this research is to develop a coding structure which allows thecompression of impulse responses to a ratio much higher than current audiocoders or the algorithm by Sonke. The compression type is lossy, which meansthat the coded version of the impulse response will not contain all informationof the original. The amount of reduction that can be reached depends on two principles. The first is based on the characteristics of the human hearingsystem. A time-frequency analysis is done to compare the impulse response topsychoacoustic masking properties of the human ear, just as in audio coders.
Secondly the characteristics of impulse responses are used to reach a meaningfulreduction of data, by discriminating between the various parts of a impulseresponse such as the direct sound, early reflections and the reverberation. Thisis done by carefully constructing a filter bank. In our model there will befree parameters, such as the number of frequency bands, the size of the windows and the quantization of the parameters which effect the quality of the compression. The difference between the compressed and the original impulse responses will be perceptually evaluated with listening tests.
The proposed model must be able to apply to a wide range of impulse responses(measured and artificially constructed) and must be practical in use. Thusencoding speed on mode computers must be of the order of magnitude ofreal-time and decoding must be even faster than real-time.
You can download my final report. I also held a presentation about this topic. My sheets (in PDF) can be downloaded in color or black/white here.If you want to do something related to my work, feel free to contact me.
[Permalink]-- Filed under: [science]
I threw it all away
Since the first july I am a full time clerc. I have made my work from my hobby, so it is needless to say I'm rather happy with it.
Nevertheless I still have to graduate for my Applied Physics title. My graduation will take place on 25 august 2003. Everyone who knows me personally is invited to stop by. A talk about my subject Transform coding of Impulse Responses Using Perceptual Analysis starts at 14:00 and I will buy you drinks at 20:00 (if my mark is positive ;-)). More information about the location will follow, more information about the subject can be found on my graduation page.
[Permalink]-- Filed under: [personal] [science]