Frequency curve from sound?

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2 total messages Started by barham Thu, 19 Nov 1992 14:09

#1173

Author: barham
Date: Thu, 19 Nov 1992 14:09

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Gidday,

I hope this is an appropriate place to post this request.  If anyone knows
of any other news groups I could also post it, let me know.

Basically, my situation is this...

At my work (Computer Based Education section of the Queensland University
of Technology) we are starting a project in Language Learning using
Videodiscs as a primary resource.  At some stage in the game we will be
getting students to repeat things that have been said on the videodisk
(or stuff played on a soundblaster card), and they will be able to here
themselves back to compare.

At some point (though this is not planned yet) we may be looking at
displaying some kind of frequency curve (if you know what I mean) of what
they say so they can compare that to what they heard (the frequency curve 
of which would also be displayed).  Note, I am not talking about a graphic
representation of the sound wave as that would appear as just so much
jibberish.

Does anyone know of any software to provide this (of necessity running
under Windows and supporting the SoundBlaster16 card), or any simple way
of getting it done?  I need to know now what is available so when the time
comes to move I can move.

Thanks,

Tim.

-- 

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| All replies to t.barham@qut.edu.au (Tim Barham)                    |
| Applications Programmer for the Computer Based Education Section,  |
| Queensland University of Technology, Brisbane, Qld, Australia      |
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| "You're so open-minded that your brain leaked out..."              |
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Re: Frequency curve from sound?

#1185

Author: Gary Fischman
Date: Thu, 19 Nov 1992 14:25

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When you say "frequency curve", do you mean a frequency spectrum display?  What you
need is a package that allows you to do an FFT on a section of the speech sample, 
and then plot the frequency domain representation of the speech signal.  I am 
working on some similar applications and I use LabWindows from National Instruments,
Austin, TX (1-800-433-3488).  In particular, they have a DSP library that controls
their Digital Signal Processor boards (although I believe they have libraries that
emulate the board - they just take more time.)  

---
	Gary J. Fischman
	NYNEX Science & Technology
	fischman@nynexst.com

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