To display human voice traces on a graphical LCD and get it analysed.

Archiver · 2001-10-26 17:13

Dear Sirs

I have an idea to build a display for human voice and show it visually on a
Scott Edwards graphical LCD module. This is relatively easy. I just need to
use a sensitive microphone, op-amp for amplification, ADC to convert the
signal from 0-5V to 12 bit digital, and hook up with a BS2 to the graphical
LCD module. There is an example available from seetron.com exactly.

However, what about some sort of analysis on the voice traces (like ECG)?
How about displaying the frequency components, harmonics,...etc. Any body
suggests if it is possible to do that with BS2 and how?

Thanks a lot.

John

Archiver · 2001-10-26 17:14

> I have an idea to build a display for human voice and show it visually on a
> Scott Edwards graphical LCD module. This is relatively easy. I just need to
> use a sensitive microphone, op-amp for amplification, ADC to convert the
> signal from 0-5V to 12 bit digital, and hook up with a BS2 to the graphical
> LCD module. There is an example available from seetron.com exactly.

Can the BS-2 and ADC digitize and display the data fast enough?

> However, what about some sort of analysis on the voice traces (like ECG)?
> How about displaying the frequency components, harmonics,...etc. Any body
> suggests if it is possible to do that with BS2 and how?

You need to do fourier analysis to get the frequencies and their
amplitudes. I'm not sure you can do that with the BS-2 either.

Paul

Archiver · 2001-10-26 19:43

John,

Adding to Paul's good suggestion about using Fourier analysis, there are
Fourier routines for PICs on the MicroChip site. You can also find Fourier
routines in Basic, but they might require more RAM than available on the
BS2. Also, you will need fast A/D for human voice (at least 6 KHz), which
might strain the BS2 resources.

There are good examples in Matlab's Signal Processing Toolbox
(www.mathworks.com) for doing exactly this. But this runs only on larger
systems (PC, Sun, Mac, etc.).

Dennis

Original Message

From: <verhap@o...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, October 26, 2001 10:26 AM
Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical LCD
and get it analysed.

> > I have an idea to build a display for human voice and show it visually
on a
> > Scott Edwards graphical LCD module. This is relatively easy. I just need
to
> > use a sensitive microphone, op-amp for amplification, ADC to convert the
> > signal from 0-5V to 12 bit digital, and hook up with a BS2 to the
graphical
> > LCD module. There is an example available from seetron.com exactly.
>
> Can the BS-2 and ADC digitize and display the data fast enough?
>
> > However, what about some sort of analysis on the voice traces (like
ECG)?
> > How about displaying the frequency components, harmonics,...etc. Any
body
> > suggests if it is possible to do that with BS2 and how?
>
> You need to do fourier analysis to get the frequencies and their
> amplitudes. I'm not sure you can do that with the BS-2 either.
>
> Paul
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver · 2001-10-26 20:04

Thanks for both Dennis and Paul. I also knows there may be some problem in
using serial LCD w/ BS2 for fast moving signal. In that case, I am prepared
to use PIC for that. There is an article on past Practical Electronics (UK)
about building a "home-made" CRO by a Toshiba LCD and 16F877 PIC. In that
case, assemble language is required but that is not too easy to handle.

By the way, that kind of hand-held home-made CRO is quite common right now.
I just wonder if they all follow the same design as I have seen in the
magazine. Those are available in velleman or jameco.

Thanks for your advice.

John

Original Message

From: Dennis P. O'Leary <doleary@h...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, October 27, 2001 2:43 AM
Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical LCD
and get it analysed.

> John,
>
> Adding to Paul's good suggestion about using Fourier analysis, there are
> Fourier routines for PICs on the MicroChip site. You can also find
Fourier
> routines in Basic, but they might require more RAM than available on the
> BS2. Also, you will need fast A/D for human voice (at least 6 KHz), which
> might strain the BS2 resources.
>
> There are good examples in Matlab's Signal Processing Toolbox
> (www.mathworks.com) for doing exactly this. But this runs only on larger
> systems (PC, Sun, Mac, etc.).
>
> Dennis
>

Original Message

> From: <verhap@o...>
> To: <basicstamps@yahoogroups.com>
> Sent: Friday, October 26, 2001 10:26 AM
> Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical
LCD
> and get it analysed.
>
>
> > > I have an idea to build a display for human voice and show it visually
> on a
> > > Scott Edwards graphical LCD module. This is relatively easy. I just
need
> to
> > > use a sensitive microphone, op-amp for amplification, ADC to convert
the
> > > signal from 0-5V to 12 bit digital, and hook up with a BS2 to the
> graphical
> > > LCD module. There is an example available from seetron.com exactly.
> >
> > Can the BS-2 and ADC digitize and display the data fast enough?
> >
> > > However, what about some sort of analysis on the voice traces (like
> ECG)?
> > > How about displaying the frequency components, harmonics,...etc. Any
> body
> > > suggests if it is possible to do that with BS2 and how?
> >
> > You need to do fourier analysis to get the frequencies and their
> > amplitudes. I'm not sure you can do that with the BS-2 either.
> >
> > Paul
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver · 2001-10-26 20:07

By the way, that application can be quite serious, you know. Say, when you
visit a doctor, all of them will use a stethoscope to hear your breath and
heart sound. When there is some problem with your heart / breath sound, the
doctor will tell you you may have some problem, freind!

In fact, the spectrum and frequncy of those sounds would be quite different
for sick people. So I just want to start that kind of research to find out
more.

....

John

Original Message

From: Dennis P. O'Leary <doleary@h...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, October 27, 2001 2:43 AM
Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical LCD
and get it analysed.

> John,
>
> Adding to Paul's good suggestion about using Fourier analysis, there are
> Fourier routines for PICs on the MicroChip site. You can also find
Fourier
> routines in Basic, but they might require more RAM than available on the
> BS2. Also, you will need fast A/D for human voice (at least 6 KHz), which
> might strain the BS2 resources.
>
> There are good examples in Matlab's Signal Processing Toolbox
> (www.mathworks.com) for doing exactly this. But this runs only on larger
> systems (PC, Sun, Mac, etc.).
>
> Dennis
>

Original Message

> From: <verhap@o...>
> To: <basicstamps@yahoogroups.com>
> Sent: Friday, October 26, 2001 10:26 AM
> Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical
LCD
> and get it analysed.
>
>
> > > I have an idea to build a display for human voice and show it visually
> on a
> > > Scott Edwards graphical LCD module. This is relatively easy. I just
need
> to
> > > use a sensitive microphone, op-amp for amplification, ADC to convert
the
> > > signal from 0-5V to 12 bit digital, and hook up with a BS2 to the
> graphical
> > > LCD module. There is an example available from seetron.com exactly.
> >
> > Can the BS-2 and ADC digitize and display the data fast enough?
> >
> > > However, what about some sort of analysis on the voice traces (like
> ECG)?
> > > How about displaying the frequency components, harmonics,...etc. Any
> body
> > > suggests if it is possible to do that with BS2 and how?
> >
> > You need to do fourier analysis to get the frequencies and their
> > amplitudes. I'm not sure you can do that with the BS-2 either.
> >
> > Paul
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver · 2001-10-26 20:19

>
> Can the BS-2 and ADC digitize and display the data fast enough?
>
> Paul

There is an example of displaying show scan rate (like a CRO in 0.5sec per
div) available in www.seetron.com. The title is Animated Strip Plot with
SGX-120 and BGX-128 Displays.

I just think if it is possible to increase the scan rate some how.

John

Archiver · 2001-10-26 20:29

John,

Yes, blood flow and breath sounds are important in modern medicine. But a
lot of good work and instrumentation has been done with Doppler and other
methods, so check the literature. If you can reduce the instrumentation to
run on a Stamp, chances are we'll all wear one due to low cost. Good luck.

Dennis
Prof
USC Biomed Engineering
LA CA USA

Original Message

From: "John Leung" <jleung00@n...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, October 26, 2001 12:07 PM
Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical LCD
and get it analysed.

> By the way, that application can be quite serious, you know. Say, when you
> visit a doctor, all of them will use a stethoscope to hear your breath and
> heart sound. When there is some problem with your heart / breath sound,
the
> doctor will tell you you may have some problem, freind!
>
> In fact, the spectrum and frequncy of those sounds would be quite
different
> for sick people. So I just want to start that kind of research to find out
> more.
>
> ....
>
> John
>
>
>
>

Original Message

> From: Dennis P. O'Leary <doleary@h...>
> To: <basicstamps@yahoogroups.com>
> Sent: Saturday, October 27, 2001 2:43 AM
> Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical
LCD
> and get it analysed.
>
>
> > John,
> >
> > Adding to Paul's good suggestion about using Fourier analysis, there
are
> > Fourier routines for PICs on the MicroChip site. You can also find
> Fourier
> > routines in Basic, but they might require more RAM than available on the
> > BS2. Also, you will need fast A/D for human voice (at least 6 KHz),
which
> > might strain the BS2 resources.
> >
> > There are good examples in Matlab's Signal Processing Toolbox
> > (www.mathworks.com) for doing exactly this. But this runs only on
larger
> > systems (PC, Sun, Mac, etc.).
> >
> > Dennis
> >

Original Message

> > From: <verhap@o...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Friday, October 26, 2001 10:26 AM
> > Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical
> LCD
> > and get it analysed.
> >
> >
> > > > I have an idea to build a display for human voice and show it
visually
> > on a
> > > > Scott Edwards graphical LCD module. This is relatively easy. I just
> need
> > to
> > > > use a sensitive microphone, op-amp for amplification, ADC to convert
> the
> > > > signal from 0-5V to 12 bit digital, and hook up with a BS2 to the
> > graphical
> > > > LCD module. There is an example available from seetron.com exactly.
> > >
> > > Can the BS-2 and ADC digitize and display the data fast enough?
> > >
> > > > However, what about some sort of analysis on the voice traces (like
> > ECG)?
> > > > How about displaying the frequency components, harmonics,...etc. Any
> > body
> > > > suggests if it is possible to do that with BS2 and how?
> > >
> > > You need to do fourier analysis to get the frequencies and their
> > > amplitudes. I'm not sure you can do that with the BS-2 either.
> > >
> > > Paul
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the Subject
> and
> > Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver · 2001-10-26 20:39

Somewhat OT, but if you want to learn more about FFT and related techniques
have a look at:

www.dspguide.com - free PDF book. I have the printed version that Analog
gives out and it is a good book.

http://www-rocq.inria.fr/scilab/ - Free software that is much like MatLab. I
have used this to write several DSP articles in the past.

Al Williams
AWC
* Easy RS-232 Prototyping
http://www.al-williams.com/awce/rs1.htm

Archiver · 2001-10-26 20:41

It can be done, but not in real-time. Maybe record and analyze a few
seconds at a time...
The code for FFT is not that complex, it just takes a lot of time to
process. It requires 3 embedded loops.

Barry

Date: Sat, 27 Oct 2001 00:13:29 +0800
From: "John Leung" <jleung00@n...>
Subject: Re: To display human voice traces on a graphical LCD and get it
analysed.

Dear Sirs

I have an idea to build a display for human voice and show it visually on a
Scott Edwards graphical LCD module. This is relatively easy. I just need to
use a sensitive microphone, op-amp for amplification, ADC to convert the
signal from 0-5V to 12 bit digital, and hook up with a BS2 to the graphical
LCD module. There is an example available from seetron.com exactly.

However, what about some sort of analysis on the voice traces (like ECG)?
How about displaying the frequency components, harmonics,...etc. Any body
suggests if it is possible to do that with BS2 and how?

Thanks a lot.

John

Archiver · 2001-10-26 20:49

Dennis

Thanks for your advice. I know todays Doppler can do a lot. My feeling is
that with the low cost of PIC todays, a lot of handle machine can be on the
shelf. That is your comment exactly pin point the market today.

John

Original Message

From: Dennis P. O'Leary <doleary@h...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, October 27, 2001 3:29 AM
Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical LCD
and get it analysed.

> John,
>
> Yes, blood flow and breath sounds are important in modern medicine. But a
> lot of good work and instrumentation has been done with Doppler and other
> methods, so check the literature. If you can reduce the instrumentation
to
> run on a Stamp, chances are we'll all wear one due to low cost. Good
luck.
>
> Dennis
> Prof
> USC Biomed Engineering
> LA CA USA
>

Original Message

> From: "John Leung" <jleung00@n...>
> To: <basicstamps@yahoogroups.com>
> Sent: Friday, October 26, 2001 12:07 PM
> Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical
LCD
> and get it analysed.
>
>
> > By the way, that application can be quite serious, you know. Say, when
you
> > visit a doctor, all of them will use a stethoscope to hear your breath
and
> > heart sound. When there is some problem with your heart / breath sound,
> the
> > doctor will tell you you may have some problem, freind!
> >
> > In fact, the spectrum and frequncy of those sounds would be quite
> different
> > for sick people. So I just want to start that kind of research to find
out
> > more.
> >
> > ....
> >
> > John
> >
> >
> >
> >

Original Message

> > From: Dennis P. O'Leary <doleary@h...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Saturday, October 27, 2001 2:43 AM
> > Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a graphical
> LCD
> > and get it analysed.
> >
> >
> > > John,
> > >
> > > Adding to Paul's good suggestion about using Fourier analysis, there
> are
> > > Fourier routines for PICs on the MicroChip site. You can also find
> > Fourier
> > > routines in Basic, but they might require more RAM than available on
the
> > > BS2. Also, you will need fast A/D for human voice (at least 6 KHz),
> which
> > > might strain the BS2 resources.
> > >
> > > There are good examples in Matlab's Signal Processing Toolbox
> > > (www.mathworks.com) for doing exactly this. But this runs only on
> larger
> > > systems (PC, Sun, Mac, etc.).
> > >
> > > Dennis
> > >

Original Message

> > > From: <verhap@o...>
> > > To: <basicstamps@yahoogroups.com>
> > > Sent: Friday, October 26, 2001 10:26 AM
> > > Subject: Re: [noparse][[/noparse]basicstamps] To display human voice traces on a
graphical
> > LCD
> > > and get it analysed.
> > >
> > >
> > > > > I have an idea to build a display for human voice and show it
> visually
> > > on a
> > > > > Scott Edwards graphical LCD module. This is relatively easy. I
just
> > need
> > > to
> > > > > use a sensitive microphone, op-amp for amplification, ADC to
convert
> > the
> > > > > signal from 0-5V to 12 bit digital, and hook up with a BS2 to the
> > > graphical
> > > > > LCD module. There is an example available from seetron.com
exactly.
> > > >
> > > > Can the BS-2 and ADC digitize and display the data fast enough?
> > > >
> > > > > However, what about some sort of analysis on the voice traces
(like
> > > ECG)?
> > > > > How about displaying the frequency components, harmonics,...etc.
Any
> > > body
> > > > > suggests if it is possible to do that with BS2 and how?
> > > >
> > > > You need to do fourier analysis to get the frequencies and their
> > > > amplitudes. I'm not sure you can do that with the BS-2 either.
> > > >
> > > > Paul
> > > >
> > > >
> > > > To UNSUBSCRIBE, just send mail to:
> > > > basicstamps-unsubscribe@yahoogroups.com
> > > > from the same email address that you subscribed. Text in the
Subject
> > and
> > > Body of the message will be ignored.
> > > >
> > > >
> > > > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> > > >
> > > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the Subject
> and
> > Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver · 2001-10-26 20:50

Thanks Barry. Do you have the site for the FFT code?

John

Original Message

From: Barry Michels <bmichels@e...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, October 27, 2001 3:41 AM
Subject: [noparse][[/noparse]basicstamps] Re: To display human voice traces on a graphical LCD
and get it analysed.

> It can be done, but not in real-time. Maybe record and analyze a few
> seconds at a time...
> The code for FFT is not that complex, it just takes a lot of time to
> process. It requires 3 embedded loops.
>
>
> Barry
>
>
>
> Date: Sat, 27 Oct 2001 00:13:29 +0800
> From: "John Leung" <jleung00@n...>
> Subject: Re: To display human voice traces on a graphical LCD and get it
> analysed.
>
> Dear Sirs
>
> I have an idea to build a display for human voice and show it visually on
a
> Scott Edwards graphical LCD module. This is relatively easy. I just need
to
> use a sensitive microphone, op-amp for amplification, ADC to convert the
> signal from 0-5V to 12 bit digital, and hook up with a BS2 to the
graphical
> LCD module. There is an example available from seetron.com exactly.
>
> However, what about some sort of analysis on the voice traces (like ECG)?
> How about displaying the frequency components, harmonics,...etc. Any body
> suggests if it is possible to do that with BS2 and how?
>
> Thanks a lot.
>
> John
>
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver · 2001-10-27 01:44

Alternatively, one could use a filter bank to
extract and access the important components.

Bob Niemhuis
nienhuis@w...

Quoting "Dennis P. O'Leary" <doleary@h...>:

> John,
>
> Adding to Paul's good suggestion about using Fourier
analysis, there are
> Fourier routines for PICs on the MicroChip site. You
can also find Fourier
> routines in Basic, but they might require more RAM
than available on the
> BS2. Also, you will need fast A/D for human voice (at
least 6 KHz), which
> might strain the BS2 resources.
>
> There are good examples in Matlab's Signal Processing
Toolbox
> (www.mathworks.com) for doing exactly this. But this
runs only on larger
> systems (PC, Sun, Mac, etc.).
>
> Dennis
>

Original Message

> From: <verhap@o...>
> To: <basicstamps@yahoogroups.com>
> Sent: Friday, October 26, 2001 10:26 AM
> Subject: Re: [noparse][[/noparse]basicstamps] To display human voice
traces on a graphical LCD
> and get it analysed.
>
>
> > > I have an idea to build a display for human voice
and show it visually
> on a
> > > Scott Edwards graphical LCD module. This is
relatively easy. I just
> need
> to
> > > use a sensitive microphone, op-amp for
amplification, ADC to convert
> the
> > > signal from 0-5V to 12 bit digital, and hook up
with a BS2 to the
> graphical
> > > LCD module. There is an example available from
seetron.com exactly.
> >
> > Can the BS-2 and ADC digitize and display the data
fast enough?
> >
> > > However, what about some sort of analysis on the
voice traces (like
> ECG)?
> > > How about displaying the frequency components,
harmonics,...etc. Any
> body
> > > suggests if it is possible to do that with BS2 and
how?
> >
> > You need to do fourier analysis to get the
frequencies and their
> > amplitudes. I'm not sure you can do that with the
BS-2 either.
> >
> > Paul
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed.
Text in the Subject and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text
in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
>
>

Archiver · 2001-10-27 17:03

I originally got it from an article by Steve Ciarcia from the 80's about
home-made EEG's. I've attatched 3 QuickBasic programs that I wrote based on
that article and a sound file to process. The sound file was created from
CoolEditPro and saved in a TXT file.

FFT.BAS is a 'spectrum analyzer' type display. Each slice of time
overwriting the previous display.
TEST.BAS is a 3D topographical display of the sound. Frequency is on the
horizontal axis and power is on the vertical axis with multiple strips of
time plotted down the screen to look like a 3D plot.
VOICEPRT.BAS prints a chart of the sound with frequency on the vertical
axis, time on the horizontal axis and power is represented by brightness
DATA.TXT is a recording of me saying the word 'spot'

Barry

Date: Sat, 27 Oct 2001 03:50:16 +0800
From: "John Leung" <jleung00@n...>
Subject: Re: Re: To display human voice traces on a graphical LCD and get it
analysed.

Thanks Barry. Do you have the site for the FFT code?

John

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[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver · 2001-10-27 19:50

At 12:03 PM 10/27/01 -0400, Barry Michels wrote:
>I originally got it from an article by Steve Ciarcia from the 80's about
>home-made EEG's. I've attatched 3 QuickBasic programs that I wrote based on
>that article and a sound file to process. The sound file was created from
>CoolEditPro and saved in a TXT file.

Just a suggestion, Barry: maybe try zipping the files and attaching the
.ZIP to the message instead. ZIPs usually make it OK and that huge .TXT
file should compress nicely.

dwayne

Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax

Celebrating 17 years of Engineering Innovation (1984 - 2001)

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Archiver · 2001-10-28 08:19

From: Dwayne Reid <dwayner@p...>

>At 12:03 PM 10/27/01 -0400, Barry Michels wrote:
>>I originally got it from an article by Steve Ciarcia from the 80's about
>>home-made EEG's. I've attatched 3 QuickBasic programs that I wrote based on

>Just a suggestion, Barry: maybe try zipping the files and attaching the
>.ZIP to the message instead. ZIPs usually make it OK and that huge .TXT

Um, it's also way off-topic, since this is a BASIC STAMP forum!!!

Not pleased!

--
Regards,

Derryck Croker

Archiver · 2001-10-29 08:03

It might be easier to build a series of filters before the ADC. band-pass
filters can usually be built with 2 or 3 components.

On Sat, 27 Oct 2001, John Leung wrote:

> Thanks Barry. Do you have the site for the FFT code?
>
> John
>
>
>

Original Message

> From: Barry Michels <bmichels@e...>
> To: <basicstamps@yahoogroups.com>
> Sent: Saturday, October 27, 2001 3:41 AM
> Subject: [noparse][[/noparse]basicstamps] Re: To display human voice traces on a graphical LCD
> and get it analysed.
>
>
> > It can be done, but not in real-time. Maybe record and analyze a few
> > seconds at a time...
> > The code for FFT is not that complex, it just takes a lot of time to
> > process. It requires 3 embedded loops.
> >
> >
> > Barry
> >
> >
> >
> > Date: Sat, 27 Oct 2001 00:13:29 +0800
> > From: "John Leung" <jleung00@n...>
> > Subject: Re: To display human voice traces on a graphical LCD and get it
> > analysed.
> >
> > Dear Sirs
> >
> > I have an idea to build a display for human voice and show it visually on
> a
> > Scott Edwards graphical LCD module. This is relatively easy. I just need
> to
> > use a sensitive microphone, op-amp for amplification, ADC to convert the
> > signal from 0-5V to 12 bit digital, and hook up with a BS2 to the
> graphical
> > LCD module. There is an example available from seetron.com exactly.
> >
> > However, what about some sort of analysis on the voice traces (like ECG)?
> > How about displaying the frequency components, harmonics,...etc. Any body
> > suggests if it is possible to do that with BS2 and how?
> >
> > Thanks a lot.
> >
> > John
> >
> >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
> >
> >
>
>
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of the message will be ignored.
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>

Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"...There's no moral, it's just a lot of stuff that happens". - H. Simpson

Archiver · 2001-10-30 01:05

Derryck, not to flame, but this is on topic since it's about how to get a
stamp to do this. The code I sent might be able to be put into a stamp if
lookup tables are used and the data is scaled properly to work within the
limits of the stamp's math. The major hurdle, as mentioned earlier, is the
sample rate required to satisfy the nyquist therom.

Barry

> Message: 10
> Date: Sun, 28 Oct 2001 08:19:38 -0000
> From: Derryck Croker <derryck@n...>
> Subject: Re: Re: To display human voice traces on a graphical LCD and get
it analysed.

> Um, it's also way off-topic, since this is a BASIC STAMP forum!!!
>
> Not pleased!
>
> --
> Regards,
>
> Derryck Croker

To display human voice traces on a graphical LCD and get it analysed.

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