I got a Zoom H1 and T.Bone shotgun mic. Built a phantom supply  for the mic and a switchable +12 dB low-noise preamp. I tested by running noise from csound to loudspeakers and recording the sound. Audacity spectrum plot shows signals to 23 kHz, but trying outdoors recording ambient sounds, there are nothing after 7 kHz. The weather is quite humid. What can cause this kind of low-pass effect? Or are hi freq signals just missing outdoors? 
Tia

-matti

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I guess it's true to say that generated white noise will probably have more ultra-highs than most natural sounds. 7Khz is however quite low.

On 16 Dec 2011, at 20:13, Matti Koskinen wrote:

> I got a Zoom H1 and T.Bone shotgun mic. Built a phantom supply  for the mic and a switchable +12 dB low-noise preamp. I tested by running noise from csound to loudspeakers and recording the sound. Audacity spectrum plot shows signals to 23 kHz, but trying outdoors recording ambient sounds, there are nothing after 7 kHz. The weather is quite humid. What can cause this kind of low-pass effect? Or are hi freq signals just missing outdoors? 
> Tia
> 
> -matti
> 
> Send bugs reports to the Sourceforge bug tracker
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Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie





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On Dec 16, 2011, at 10:55 PM, Victor Lazzarini wrote:

> I guess it's true to say that generated white noise will probably have more ultra-highs than most natural sounds. 7Khz is however quite low.
found a pdf from nasa, where atmospheric propagation had a really big effect, humidity, vegetation even the time of day etc. The pdf was corrupted, so some graphs were unreadable,  but overall high-freqs are attenuated. But didn't expect so strong effect.

thanks

-matti
 

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