From: Joerg Hansmann (info_at_jhansmann.de)
Date: 2002-01-01 17:08:57
Hi Jim,
----- Original Message -----
From: Jim Meissner <jpmeissner_at_mindspring.com>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Monday, December 31, 2001 6:24 PM
Subject: Re: [buildcheapeeg] Re: Meditation - UP mode
>Dear Joerg:
>
>I would be very interested to see - hear what you have written.
OK. You should have it now in a separate email.
It works with win9x (e.g. Windows 98)
>I am not a programmer but I work at it. So far as I am aware,
>it is not possible to get accurate microsecond timing when addressing
>the sound card to generate pulses.
At 96kHz sample rate you get 10.4us resolution.
>Maybe you have the answer? ( BTW
>a 10 microsecond difference is significant! )
Speed of sound in air is about 300m/s.
So 10us is equivalent to 3mm runlenght difference. Why should that
be so important when a sound-source is positioned from left to right
and reverse ?
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 ;-) )
>With my Brain State Synchronizer, I use Small "C" and the pulse
>routines are written in machine code to get the speed.
>
>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.
>Let's see if you got something that works before you worry about
>option 1) or 2) or others.
There is at least some evidence, that it works:
Some days ago I visited a friend who seemingly needed some coffee:
Accidentally at this time an annoying fly was buzzing around him.
He tried about twenty times to catch it and gave up.
After listening to the sound for some minutes, he was able to
get the fly in only two attempts.
Regards,
Joerg
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