Raimund,
I'm surprised by your test. What type of microphone did you
use ? Did you used max gain on all recorders ? and then how much gain
to normalize ? In general, can you provide more details about the
test, including the post processing of the files ?
Gianni
At 21.59 04/01/2007, you wrote:
>Due to the varying background noise level, there is always some
>uncertainty in such kind of serial tests. Nevertheless, from my own
>experience, I can say that the 722 proviodes a significantly lower
>cutoff frequency.
>
>According to the specifications, the 722 cut-off frequency is 10 Hz
>(-0.5 dB):
><http://www.sounddevices.com/download/guides/722_en.pdf>http://www.soundde=
vices.com/download/guides/722_en.pdf
>
>and the HD-P2 cut-off is at 20 Hz (-1.0 dB):
><http://www.tascam.de/en/docs/HD-P2_Eng_1_00.pdf>http://www.tascam.de/en/d=
ocs/HD-P2_Eng_1_00.pdf
>
>Note that the -1.0 dB frequency of the SD 722 must be lower than 10 Hz
>(may be 5 Hz?).
>
>There is no information on the steepness of the filters. The SD 722
>also allows to activate higher cut-offs at 40, 80, 160 or 240 Hz @
>12/18/24 dB/oct.
>
>Raimund
>
> > Are you sure? The difference sounds too big for that.
> > At which freq. are the cut off's?? And how much?
> >
> > Klas.
> >
> > At 19:03 2007-01-04, you wrote:
> > >Yes, the difference between the HD-P2 and the SD722 noise levels are
> > >very small. The low-frequency rumble of the 722 section is caused by
> > >its lower cut-off frequency.
> > >
> > >Raimund
>
>
>
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Gianni Pavan
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA
Phone +39-0382-987874 Fax +39-02-700-32921
Email
Web http://www.unipv.it/cibra
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