2. Re: file types Hi HZ subjects?

["Raimund Specht" animalsounds]

I wrote:

> > If you take a closer look at the samples posted here, you will find that 
> > there is usually very little energy above about 10 kHz.
 
John wrote:

> The above statement may be a bit misleading though.
> 
> You need to be aware that most of the samples here are just that. >Samples. 
> Most of these 'samples' have been converted to MP3 for size >and download 
> speed consideration of the Internet. They have probably >NOT been recorded to 
> comply with this requirement, but converted >from a much higher resolution.

Hi John,

Sure, the MP3 compression will also introduce additional low-pass filter 
effects. Though, even if I look at uncompressed high-quality recordings, I 
cannot find much high-frequency components (except perhaps if a bat was 
accidentally flying by). 

Things would be a bit different in close-up recordings where the microphone was 
more or less aimed at the vocalizing subject.

Regards,
Raimund