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Re: high sampling rate field recordings (FA66 issue)

Subject: Re: high sampling rate field recordings (FA66 issue)
Date: Mon, 27 Jun 2005 11:30:57 +0200 (MEST)
Hi Gianni,

As far as I know, all of the new 24/192 audio recording devices (including
SoundDevices 722/744) use A/D converters of the new Cirrus Logic CS53x1 chi=

In the 192 kHz mode, these chips have a poor frequency response (see quad
speed mode in the above data sheet on page 9) and an increased noise floor
certainly at ultrasonic frequencies. Actually, this is no problem for
recording normal audio, as the high-end microphones with extended frequency
range (e.g. Sennheiser MKH800) also have a increased noise floor at higher

So, if you want to record ultrasonic signals at high quality, other
specialized equipment is required. As you already noted, the Lynx Studio PC=
boards are an exception because they use a different A/D converter by AKM
that is however not suited for portable devices.

One solution for recording ultrasonic signals in the field are our
UltraSoundGate devices (, which employ specia=
A/D converters by Analog Devices that have been designed for measurement
purposes and therefore ensure a consistent frequency response and noise
behavior on all sampling rates.


Avisoft Bioacoustics

Weitersagen: GMX DSL-Flatrates mit Tempo-Garantie!
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Loudspeakers are not birds,
A listening room is not nature."
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