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=
p
family:
http://www.cirrus.com/en/pubs/proDatasheet/CS5381_A4.pdf
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
frequencies.
So, if you want to record ultrasonic signals at high quality, other
specialized equipment is required. As you already noted, the Lynx Studio PC=
I
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 (http://www.ultrasoundgate.com), which employ specia=
l
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.
Regards,
Raimund
Avisoft Bioacoustics
--
Weitersagen: GMX DSL-Flatrates mit Tempo-Garantie!
Ab 4,99 Euro/Monat: http://www.gmx.net/de/go/dsl
[Non-text portions of this message have been removed]
________________________________________________________________________
________________________________________________________________________
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
------------------------------------------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/naturerecordists/
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
------------------------------------------------------------------------
|