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Re: Re: Questions for audio gurus

Subject: Re: Re: Questions for audio gurus
From: Gianni Pavan <>
Date: Fri, 24 Feb 2006 22:40:43 +0100
At 22.03 23/02/2006, you wrote:
>Relatively inexpensive portable high sampling rate consumer Ato D interfac=
>or digital recorders suggest this sort of investigation is now more
>(assuming a suitable microphone), but, as Gianni and Raimund have shown he=
>the antialiasing in the devices they've tested is, unfortunately,
>designed for
>audio range input.

This is not completely true. Some devices running at 96 and 192 kHz
have sharp a-a filters at both frequencies, but others have good
filters at 96 kHz and very smooth (bad) filters at 192 kHz. In some
192 kHz devices I also found a frequency response smoothly falling
above 40-50 kHz.

Thus it is important to carefully test the devices before completely
trusting in their specifications.

I'll try to publish some tests soon.

Gianni Pavan
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia
Via Taramelli 24, 27100 PAVIA, ITALIA
Tel        +39-0382-987874
Fax        +39-02-700-32921

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