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HP54750 Direct I/O, Peak Detection

Question asked by VRFuser on Feb 24, 1998

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"Daniel J. Pompea" <DANIEL.J.POMPEA@cpmx.saic.com> wrote:
>
> 2) Any automatic peak detection algorithms to process a 512 point waveform,
> and find the top 5(or so) peaks, and their locations. I have not been very
> successful in manipulating array objects and creating (I guess) subarrays.

I hacked together a quick example last night that should do what
you want. Returns first "n" peaks from the input data. Fairly crude
but should give you the idea- and it works fairly quickly: ~250msec
on my notebook (pentium 133) to find 10 peaks out of a 2500 point array.

regards

Stan Bischof
rsb@sr.hp.com
************************************

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VRFuser Feb 22, 1998 10:57 PM
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As a relatively new HP Vee user, I am having difficulty and would
appreciate any samples/examples you are willing to share, in the following
areas:

1) Interfacing with an HP54750A Digitizing O Scope, via HPIB. Both in
developing a front panel, controlling instrument, and getting it to send
waveforms back to Vee.

2) Any automatic peak detection algorithms to process a 512 point waveform,
and find the top 5(or so) peaks, and their locations. I have not been very
successful in manipulating array objects and creating (I guess) subarrays.

Many thanks in advance.

Dan Pompea

PS. I be interested in, and willing to help coordinate, a Vee Users Group
in Colorado Springs. Call me at 591-3753 if you're interested.

Daniel J. Pompea
Science Applications International Corp.
Colorado Springs Software Development and Integration Facility
daniel.j.pompea@cpmx.saic.com
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VRFuser Feb 23, 1998 4:41 PM
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Dear Dan,

     I wanted to make sure that you had seen the MaxX() function in Vee.
     You will find it in Data-Filtering. This will find you one peak.
     You could use this in combination with ClipUpper if you wanted to
     accumulate more than one peak. This would require you to loop with a
     temporary buffer to hold the data that has had the previous peak
     clipped. The ClipUpper is also in data filtering. Watch out though,
     the clip upper clips everything above a value ( > ), not greater than
     or equal to (>=). So, you may have to fudge a little to get rid of
     your peak: this may not be what you want to do.

     So, in recognition of the drawback of CLipUpper, you may wish to use
     the comparitor instead, this gives you more control of your decision
     making and still returns the value that you want.

     This should give you a start and keep things simple too.

     Good luck,
     Andrew

______________________________ Reply Separator _________________________________
Subject: VRF: HP54750 Direct I/O, Peak Detection
Author: Non-HP-DANIEL.J.POMPEA (DANIEL.J.POMPEA@cpmx.saic.com) at
HP-PaloAlto,uugw6
Date:    2/23/98 1:57 PM

As a relatively new HP Vee user, I am having difficulty and would
appreciate any samples/examples you are willing to share, in the following
areas:

1) Interfacing with an HP54750A Digitizing O Scope, via HPIB. Both in
developing a front panel, controlling instrument, and getting it to send
waveforms back to Vee.

2) Any automatic peak detection algorithms to process a 512 point waveform,
and find the top 5(or so) peaks, and their locations. I have not been very
successful in manipulating array objects and creating (I guess) subarrays.

Many thanks in advance.

Dan Pompea

PS. I be interested in, and willing to help coordinate, a Vee Users Group
in Colorado Springs. Call me at 591-3753 if you're interested.

Daniel J. Pompea
Science Applications International Corp.
Colorado Springs Software Development and Integration Facility
daniel.j.pompea@cpmx.saic.com
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VRFuser Feb 23, 1998 6:17 PM
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Stan,

Thanks very much for your help, and especially your willingness to share
your expertise. Andrew Hamilton, also of HP, sent me some tips, too. As I
replied to him, I hope all of you at HP will get together and put up a Tech
Notes/Tips and Tricks section in the Vee pages on the Web. With all the
knowledge within HP, you could put together a real bang-up section, which
would be of great help to new Vee users, as well as veterans.

Your name sounds very familiar...are/were you at the Colorado Springs
plant? I think you may have been in a Word Processing class that I taught
for Pikes Peak Comm. College. (or not...)

Thanks again!
Dan

----------
From:      Stan Bischof[SMTP:rsb@sr.HP.com]
Sent:      Tuesday, February 24, 1998 1:17 AM
To:      DANIEL.J.POMPEA@cpmx.saic.com
Cc:      hpvxd_xc@hpislsup.lvld.HP.com
Subject:      Re: VRF: HP54750 Direct I/O, Peak Detection

"Daniel J. Pompea" <DANIEL.J.POMPEA@cpmx.saic.com> wrote:
>
> 2) Any automatic peak detection algorithms to process a 512 point
waveform,
> and find the top 5(or so) peaks, and their locations. I have not been
very
> successful in manipulating array objects and creating (I guess)
subarrays.

I hacked together a quick example last night that should do what
you want. Returns first "n" peaks from the input data. Fairly crude
but should give you the idea- and it works fairly quickly: ~250msec
on my notebook (pentium 133) to find 10 peaks out of a 2500 point array.

regards

Stan Bischof
rsb@sr.hp.com
************************************

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HP54750 Direct I/O, Peak Detection

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