From: Joerg Hansmann (info_at_jhansmann.de)
Date: 2001-08-13 14:12:47
Hi,
----- Original Message -----
From: Vladimir.K <gogol101_at_yahoo.com>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Friday, August 10, 2001 5:54 PM
Subject: [buildcheapeeg] How to build cheap EEG Walkman
> *************************************************
> Model I
> - take excellent Joerg's gameportEEG
Thanks for praising my design. However it is somewhat
obsolete now. Better take the new RS232EEG02analog
part of the recent modular approach.
It has features like shield drivers and right leg driver and a
test subject protection against circuit failures.
> - add Schmitt Trigger based on NE555 , clean up input signal
Bandpass filtering ? Or FFT ?
> and square output signal ( we are interesting only for dominant
> frequency )
> - multiply frequency by let say 128
What algorithm/method do you want to use for frequency multiplication ?
> - put signal to headphones
>
> Model II
> - same as Model I, but:
>
> - operate separately with left and right phone channel
> - shift left phone channel about input frequency plus next 0.5 - 1 Hz
> so we have now binaural beat frequency
> - there is also switch for adding or taking away 0.5 or 1 Hz frequency
> so we can train encreasing or decreasing brain waves.
That reminds a little bit of the "flexyx " method of Len Ochs.
However he did not use the full spectrum but only one predominant
frequency.
> - put input frequency also to light googles
BTW. it is rather easy to connect LED-goggles to the COM-port.
> Model III
> First two models are factually L/S machine. Model III is different.
>
> - take excellent Joerg's gameportEEG
> - add Schmitt Trigger based on NE555 , clean up input signal
> and square output signal ( we are interesting only for dominant
> frequency )
> - detect input frequency for ( 20, 15, 12, 9, 7, 5 Hz)
> by let say LM567
I will have a look at the datasheets.
> - play tone( for diferrent frequency dif. tone) for let say 5 s after
> detection input frequency
Why 5 s ? It seems rather late to me.
For effective learning the feedback should be a fast as
possible.
Regards,
Joerg
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