From: Vladimir.K (gogol101_at_yahoo.com)
Date: 2001-08-14 13:17:35
--- In buildcheapeeg_at_yahoogroups.com, "Joerg Hansmann" <info_at_jhansmann.de> wrote:
> 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.
>
I know that shield drivers and right leg driver are better but
I haven't seen board design and gameportEEG looks like somethink
what , I hope, will be able build. ( even I don't like DC-DC
convertor.)
> > - add Schmitt Trigger based on NE555 , clean up input signal
>
> Bandpass filtering ? Or FFT ?
>
I havent seen many brains pattern, I'v saw only simple paterns like
this:
*
* *
* **
*--------*-------*
* *
* *
* *
where you can see "main" wave. So I thought, for simplicity, we don't
need FFT. And we cannot cut off frequencies 4-8 Hz.
All design is mentions as hardware.
> > 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 ?
>
Am talking about somethink what I realy don't understand. I don't know
if it's possible.
> > - 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.
>
I pleased that idea is vital when somebody else realized it.
But flexyx don't have EEG Walkman.
> > - put input frequency also to light googles
>
> BTW. it is rather easy to connect LED-goggles to the COM-port.
>
>
We don't have COM-port. Devices are portable - as walkman.
> > 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.
Question is how quickly you change state f.e. from 20 - 15. I tought
that tone is reward. But it could be 1 s.
>
> Regards,
>
> Joerg
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