| Re: noise reduction [message #19005] |
Mon, 21 February 2000 00:00 |
Liam E. Gumley
Messages: 378
Registered: January 2000
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Senior Member |
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Ingo Gross wrote:
>
> I�m working as a student for my diploma-thesis on a tool for noise
> reduction
> with microphones.
> I�ve to examine the noise IN a bottle.
> I want to avoid the influence of noise around the bottle.
> Therefore I�ve put two microphones recieving two different signals:
> One into the bottle, the other outside.
> One microphone recieves the soundl in the bottle and the surrounding
> sound,
> the other recieves the surrounding sound only.
> I want to substract the two signals to reduce the disturbing signal.
>
> I�ve used my soundcard to record the signal which created a
> stereo-wav-file.
> This file is to examine by some software.
>
> - Which tool shall I use? IDL or MathLab?
> - Is it possible to import the stereo-wav file into IDL / MathLab ?
> Or do you have any conversion-tools ?
IDL version 5.3 can read, write, and query WAV audio files. If you grab
the demo version of IDL from
ftp://ftp.rsinc.com/pub/idl_5.3/
you can try loading one of your WAV files:
file = dialog_pickfile() ; select a WAV file
info = query_wav(file) ; get information about the file
help, info, /structure
data = read_wav(file) ; read the file
help, data
For more information, see the online help:
? read_wav
Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley
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