Theo Verelst Local Diary Page 28

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Mon Oct 21 23:39     2005

Well, so what have I come up with to top of or not disappoint after the previous diary page ?

Music Fair

Well, I've made my own synthesizer, studio/PA system and portable biamped powered studio monitors blow air at the biggest dutch musical instrument fair last week, Mile 2005.

Buildup day:

Second day (the first day barbara had hung up advertisements, the second day I spend most of the time at the stand because I was alone, and did more than a bit of (also loud) music playing):

Zie ook hun site en deelnemerslijst.

Viewing Siggraph

I've joined SIGGRAPH as web member, and read some 2005 proceedings, and looked at half the 2004 and 2005 conference presentations videos over the web based viewer.

The 2005 keynote was from George "Star Wars" Lucas:

I had (besides the AES...) to become a acm siggraph member to acces this material, but that also gives acces to the siggraph proceedings in decent pdf form) so the price performance ratio of the membership is pretty good.

Audio Engineering Society Lecture

Audio Engineering Society -Netherlands  lectures have started again for the new season, starting with a lecture I visited about multichannel recording for instrument sound field simulation, high bandwidth multichannel high quality internet remote listening and vibration capturing and all kinds of speaker systems to make audio and video telepresence work credibly.

The lecture room at the Delft University Physics department, where I was regularly before for university classes, instruction and later for PhD level theoretical physics courses, which is a nice room:


A slide from the lecture:

Its about a piano or other instrument being recorded in all kinds of directions to determine how the sound is radiated in all directions, and then more then a few loudspeakers in all kinds of directions are used to reproduce the sound field of the instrument.

Car fixin'

Uhm, the car has been fixed by yours truly with a (cheap, second source, non-Renault that is) radiator, which went without problems in a few hours, including de-airing. The machine has taken two persons and a whole back and trunk full of luggage and equipment to and fro mid-france again after (2000 km), so it has proven ok again for half the garage fee or so, where they were quite helpfull and pointed at the second source part suppliers.

Work done in France

During my stay in france a few weeks in nature environment I've ported my reverberation program from Blackfin C for the dual core DSP I've used to test it on to run also on the PC using windows XP and the cygwin C environment and gnu C-compiler. Works perfectly neat (about 50 percent CPU use on a fast pc/notebook), its a bit heavy on memory at the moment, but it sounds great when using the high quality AD/DA converter. A bit noisy in 16 bits with the noise of the AD converter though. This will NOT be an open source but a commercially aimed R&D project though. The synth can be completely downloaded: hardware programming, DSP source code, the whole thing, but this will not be. It is clear from the experiments that this type of reverb benefits from clear, high quality AD/DA and amplification, that makes the sound experience great, and in fact it tends then to make the Yamaha S90 built in reverb unit (which is quite good) a bit pale in comparison (though it doesn't do all the same effect at the moment).

Also in france, the synth has finally been given an important addition to its sound algorithm: resonance for its time varying filter, like the classical resonance control on analog filter. It works well, even over the whole audio range, though a little less pronounced for the higher frequencies, which I'll look into, and it certainly oscillates too. There is no clip control, so near-oscillation is normally the way to go for maximimum. It sounds clear, cool , strong, penetrating, undistorted and pretty great. Carving out harmonics from sawtooths with the live cutoff parameter control  works fine and makes wonderfull sounds, expecially when used polyphonically and with some chorus.

Also, I've added vibrato by using and frequency controlling a sine wave LFO from the chorus section except depth of the modulation is not exponential, so works more for lower frequencies. Together with the notebook based reverb, which I mixed in over the DSP board audio input , and drove with a seperate synth output to the USB AD/DA converter, vibrato sounds very nice, for instance with flutey tones (with resonance). I've made the filter track to an extend with the keyboard, too, and experimented a bit with (hard-coded) changes of the the envelope amount to filter cutoff, and made actually better bass sounds for the song Dolce Vita.

Thus far I didn't have a serial link with the blackfin DSP, but I changed a cable now to make that work fine with a notebook at 100kbps, and I even gave a running synthesizer program (with sound interrupt) an added serial link, together with the midi input, except not yet simultaneous with the display of the synth, but I could send strings to the display which then show immedeately for testin purposes. So thats good for a communication link with a pc at 10 kilotbyes per second, and could make me use the midi of the synth to also drive a PC program, like the string simulator, also on linux!


I'm a dot ORG now! I've been given the url (some nameservers prefer, which redirects to the local server, hopefully reliably. Also, I can receive mail from the simple address . The short Theo (my first name) and then Ver (the first three letters of my surname) come from when I borrowed books from amsterdam university library, where they constructed ID's that way, its just easy to remember, and I've used it all over the place already and is nice and neutral. So remember: there is now,, and !

And I may well be running the web server and more on Linux in the near future! With another modem on the machine I can use it doesn't require the USB ADSL modem anymore but can happily internet over an 100baseT ethernet link which works fine from linux (dual OS disc). I've immediately installed Red Hat Fedora core4 on some space, which goes pretty fast with 5megabit/sec download, and used apache (to begin with) and a ntfs acces core module to serve the original webpage directory tree in no-time from Linux, which works great, except for special pages. The modem also acts as etherswitch/router which works fine and also acts a firewall, which together with linux should be about as safe against attacks, virusses and unauthorized access as would ever normally be needed. Without downloading programs and disallowing external account access it would almost be boringly safe... And then I could still add external fpga/microcontroller based unchangable intelligence/system watchkeeping and an electronic noise source for generating random numbers, and web serving can be done be either of two machines, so the whole thing could be sold to the FBI I guess.

Usb Disk

I've been playing with a 60 GB Usb diskdrive I made from some relatively cheap parts, it's a 2.5 inch replacement notebook drive, whichis cool, and the usb2 works quite fast: 20 megabytes per second or so, a CD copy takes maybe a minute. I've put a number of audio CD's (from the libray) on it in the form of a wav file (44.1kS/s, 16 bit stereo, uncompressed) per song on it, which can be played back with for instance the winamp media player, also more songs than 1 at once, which is great.

Printing Digitial Pictures

A t-shirt and printed pictures look good from a store with internet upload, I have made some  pretty good nature pictures in france which were printed.

The above was high quality printed on a t shirt which I wore one day at the fair.

Walking on the Moon

I was given a preview ticked to "Magnificent Desolation: Walking on the Moon" a 3D movie, where special glasses make a real 3 dimensional picture possible, including strong directional sound, which was great to see, though maybe throug my glasses the actors looked a bit like dwarfs, even though they seemed to be really near. Maybe the theater screen wasn't big enough, but it wasn't small: the arena cinema in Amsterdam.

Great subject, I love looking at the movies at Nasa TV's (see for the 300 kbps link take the yahoo feed, that looks quite good, comparisonwise) about the gemini and Apollo travels.


Fundamental Science, my field?

Of cource, naturally I'd say, though I had more interests, but I scored high in physics already at highschool: overall graduation exam there (that's at 18 or so) I scored 9.4 out of 10, while I was still missing classes for the mian stageplay technical committee which I led, and while I did not much work for it (in fact I;d have scored a 10 rounded if my teacher wouldn't have limited a certain test to get everybody at most an 8 for perfect score, grr). Also at university I was good at physics, I've assisted in electronics a hundred physics students a year younger (with good success of course), I scored a 10 (A+) for a second or third year physics exam about electromagnetics as part of the EE curriculum without working all too hard for it, which was considered very hard material.

As I wrote, I also joined a class in theoretical physics at some point, where I co-lectured the members, which content-wise was cool, and where I also without help made some non-trivial assignment solution work mathematically (3.3 in negele/orland qmps).

Also, my graduate grades (well, lets say the last years of the academic engineering degree in Electrical Engineering, Network Theory Section) were not exactly devoid of 9s (A(-?)s):

* my laboratory task (same subject as graduation "The feasibility of a chip design for ray-tracing bicubic rational Bezier Patches") was rewarded with a 9,
* Computer Aided Circuit Design (a chip design practicum, I heard the design later on actually worked) a 9,
* CACD special subjects (I did work on chip boundary scan) a 9,
* digital design course (forgot the name and the exact grade) 8 or 9,
* Computer Graphics a 9,
* electronics III advanced course in chip related subjects (with practicum too IIRC) a 9,
* and in my first years I scored at least a 9 for a network theory and physics exams,

and some more which I forgot, some of which (according to the examinators) could have been higher grades if I'd have done the exams earlier or the practicum would have been handed in faster (but I had lots of activities, including starting a software and computer courses company, and advanced musical bands and such).

This same man, in that same period of time, was flunked ("failed") 3 (THREE!!!) times for a course in digital signal processing, by a guy that later of course had to mess up my work life as a project leader (while it was started by me as a project, but then again, top fellow students ripping content off for papers was also accepted). Remarkable, isn't it. I NEVER failed any other course which I started as graduate, all others I eventually passed. Some power, it would seem... (Because there is no question about it I mastered the material MORE than enough).

Well, and of course I also did less fundamental/hard core beta science courses like a heavy courses in business economy, formal logic, philosophy of science, both advanced datacommunication courses (A and B IIRC), which of course I passed. I followed (when I'd graduated, so no need for exams) also a information theory doc course about multidimensional information theory, and another physics (doc?) course.

So, if I now want some fundamental science on my track, that should be possible at the highest levels officially! But I don't need to do exams I'm a fully qualified Electrical Engineer already (1991), in fact in a half year moderate work I could easily have been a PhD in EE (which is often not considered much of an advantage), too. And when I graduated, the section Network Theory was the considered the highest ranking in the university, still, though a bit later on the level dropped, also of the whole university: it has turned a bit provincial, and certainly not up the high standards I got used to in my forming years there, with EE consisting of 3/4 of the time fundamental mathematics.

But I'm convinced that its a good idea not to lose sight of the hard-core fundamental sides of my branches of science, for which I'm luckily qualified, and quite capable of following and learning in, so I thought I'd read up on:

   Engineering electromagnetics / by Umran S. Inan and Aziz S. Inan  (CB EMC199)

CB ECR19 Three hundred years of gravitation
Author   Hawking, S.W.

The first is a book I found an a Stanford Electromagnetics course, and the second happened to be in the open searchable new Delft University library about the subject, probably I'll want to see some contentwise books about gravity and cosmology, like from Stephan Hawking.

Who's Got The Praise?

"We've got the praise" singing bands at least for sure not, I'd think. I guess somebody must have read or known about my pages and though an offensive would be the best defence against my rejection of the God channel music as anything worth noting. Well, that hasn't done them good, and with such statements, I presume in de spirit of "we've got the funk" nobody is going to find them sympathetic.

Some time ago I made these screen pictures:

Europe: the Final Countdown?

Well, the smoke and burning of the final countdown for the Apollos and geminis and what was the russion spacecraft called again, has already taken place, till the point of touchdown on the moon repeatedly...

I don't believe in Europe. I hope soon via the US the 70's, which I'm sure were originating from there mostly too, will return to europe, to forget all the freemason sh*t, number of the beast non-sense, and captivitiy in all kinds of delusions and oppressiveness and unfreedom.

Along the way to my old car park spot, there are (free ?) chickens amoung the pigeons....