Ah, yes Bill, that I was aware of, but it wasn't the question. It was to do
with amplification and human hearing, not microphones and animal sounds, and
Eric has answered it beautifully.
Cheers
Max
Sent from my iPod
On 6 Jan 2013, at 02:29, "William" <> wrote:
> One reason would be examining recordings of animal sounds that extend into
> the ultrasonic. A reasonable number of nominal 'audio' microphones perform
> decently in the lower ultrasonic.
> Bill R.
>>
>> This post of Greg's brings up an interesting question for a hearing impaired
>> person like myself. Even using both my hearing aids, I don't hear anything
>> above 9K. Even people who hear well, as I understand it, rarely hear 20K.
>> So, the question is, why should a preamp be called on to amplify frequencies
>> above 20 K if nobody can hear it? I frequently see references to magnitudes
>> above 20K; I'm guessing this is purely techno babble. I realise of course
>> that these frequencies are real, but humans can't hear them any more than
>> they can see in the infra red.
>> I feel sure that there's a perfectly logical, if complex reason for this,
>> and perhaps it's not easy to explain simply, but if it is I'd be interested
>> to hear it.
>> Cheers
>> Max
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