From: Jim Meissner (jpmeissner_at_mindspring.com)
Date: 2002-01-02 23:01:03
Dear Joerg:
> I was able to get your program to run. Nice job.
> Even though the frequencies went from 10 to 20 hz,
Should it have been another range for UP-Mode PROG 01 ?
> I found it
> very annoying to listen to.
I am confused: Is this good or bad ?
> Much of the programming of the sound sequence is art.
> I spent months fine tuning the
> frequencies. My joke is that Jimmy Hendrix and Andre Segovia
> both played the guitar, but what a difference.
Thanks, I needed that ;-)
Now I only have to guess, who I am...
The frequency range was just fine. I did not look at the sound with the oscilloscope yet, but the phase was all over the place. I do not know if youdid that on purpose or not. I did not like to listen to it. It was JimmyHendrix, and for me that is not good. ( Some people love Jimmy Hendrix! )
Could you write a version with no delays and rand() functions to see if thepulses were working. Just equal pulses that sound centered.
I am studying your code. I have never used structures before. So I am Kindergarten programmer. I may or may not be able to keep up with you!
Juergen P. (Jim) Meissner
Check out my Website at www.MeissnerResearch.com
Read about the benefits of the Brain State Synchronizer sounds for improving your life and health.
----- Original Message -----
From: Joerg Hansmann
To: buildcheapeeg_at_yahoogroups.com
Sent: Wednesday, January 02, 2002 1:27 PM
Subject: Re: [buildcheapeeg] Re: Meditation - UP mode
Dear Jim,
----- Original Message -----
From: Jim Meissner <jpmeissner_at_mindspring.com>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Wednesday, January 02, 2002 4:07 AM
Subject: Re: [buildcheapeeg] Re: Meditation - UP mode
...
> > At 96kHz sample rate you get 10.4us resolution.
>
> Does that mean that at 44100 it would be 20.8 us?
Yes.
> That might be a bit jerky
> but maybe OK, I would have to hear it.
Hopefully I will have a SDL console application (with command line interpreter)
running the next days. Then it should be possible to play around with all
parameters without recompiling.
> > I have experimented with delays up to 1000us and could definitely
> > not tell the difference between 1000us and 500us. (So maybe I have
> > problems with my ears ;-) )
>
> I would not have believed that a biological system could respond to even
> millisecond delays. I was shocked when I discovered this. Try it again with
> two identical 3 msec. pulses. Shift
> the phase by 100 us and you will be surprised how sensitive the ear/brain
> system is to establishing the apparent direction.
Seemingly not my...
Without attenuating the delayed channel by at least 6dB,
delay alone only gives me a very vague direction impression.
> This sense has kept man alive for thousands of years. A large part of the
> brain is devoted to keeping track of his sonic environment.
Perhaps thousands of years ago I would have had no chance to survive ;-)
> > If you have a skeleton of the code that works I would be willing
> > to try to fine tune it.
> > The source is in the separate email too.
> > Alternatively you could tell me what could be improved and
> > I implement it.
>
> I was able to get your program to run. Nice job.
> Even though the frequencies went from 10 to 20 hz,
Should it have been another range for UP-Mode PROG 01 ?
> I found it
> very annoying to listen to.
I am confused: Is this good or bad ?
> Much of the programming of the sound sequence is art.
> I spent months fine tuning the
> frequencies. My joke is that Jimmy Hendrix and Andre Segovia
> both played the guitar, but what a difference.
Thanks, I needed that ;-)
Now I only have to guess, who I am...
> I looked at your code and will need a few hours to study it.
> If I am able to remember how to program in C, I would
> prefer to modify the code on my computer and do the fine
> tuning here.
Feel free to do that. However the code is under
construction and changes rapidly.
> Would you be willing to set me up with the
> programs needed to compile the C code and run it here?
I have used the MSVC6.0 compiler and can give you the
project files (*.dsw, *.dsp).
Everything else (SDL 1.2.3) can be downloaded at http://www.libsdl.org
If you do not have MSVC and want a freeware compiler instead, it should be
possible to use the GNU mingw32 compiler. However I do not have any
experience with mingw32.
> I have a Compaq Presario 1250,
CPU ? Mhz ? RAM ?
Soundcard ?
> with Win98.
Should be OK.
> Years ago I hired a programmer to write the core program and then
> I was able to push variables around until it
> sounded "right". There are about 12 variables that control all
> the programs in my Brain State Synchronizer. These
> are called up from the EPROM and loaded into the program and
> run.
The version currently under construction has 17 parameters:
/*
SweepDuration_sec;
PulseLength_sec;
// frequency sweep:
// ----------------
StartFreq_Hz;
StartFreqRnd_Hz; // +- random frequency modulation per pulse
EndFreq_Hz;
EndFreqRnd_Hz; // +- random frequency modulation per pulse
// stereo position sweep:
// ----------------------
StartPosition; // -1.0 max left, 0 middle, +1.0 max right
StartPositionRnd; // +- random per pulse
EndPosition; // -1.0 max left, 0 middle, +1.0 max right
EndPositionRnd; // +- random per pulse
MaxAttenuation_dB;
MaxDelay_sec;
// volume sweep:
// -------------
StartVolume_dB;
StartVolumeRnd_dB; // +- random amplitude modulation per pulse
EndVolume_dB;
EndVolumeRnd_dB; // +- random amplitude modulation per pulse
// misc:
// -----
next_to_do; // 0: repeat forever, -1: stop, n>0: load parameter set n
*/
So I guess, that I change things, that were fixed in your SW ?
> On the PC these could be in a BAT file that
> the program looks at and executes. During development it would
> be nice to have an on screen edit of the variables,
> and then to save that to a file for future use.
I am just working on that (using SDL_console package)
> What do you think?
Yes. Why not. It could be done that way.
Regards,
Joerg
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