Intermodulation distortion test file, was Olympus LS-14 initial tho

["Raimund" animalsounds]

I just created a synthetic 192kHz/16bit .wav file containing two overlaid 
ultrasonic sweep signals that cross each other at different ultrasonic 
frequencies:

http://www.avisoft.com/scratch/intermodulation%20distortion%20test.wav

When I play this ultrasonic file at high volume through a broad-band playback 
system, I can clearly hear the intermodulation distortion products that I was 
talking about. 

Changing the sound card playback format to 44.1 or 48 kHz (which will limit the 
analog bandwidth of the playback system to audible frequencies) fortunately 
removes the strange chirps that I hear at the full bandwidth.

In my understanding, this just means that the imperfect (nonlinear) properties 
of a high-bandwidth playback system can add horrible artifacts. So, please 
don't interpret this test as a proof for ultrosonic human hearing ;-)

Regards,
Raimund











"While a picture is worth a thousand words, a 
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.



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