At 12.41 02/09/2006, you wrote:
> >...snip...
> >
> >The EM23s appear to be 4.5dB more sensitive than the Rodes.
> >The AKG appear to be 2.5dB more sensitive than the Rodes.
> >Then I analyzed the recording in the spectrum window of Adobe
> >Audition 2.0 with a large FFT size (65536) and by averaging across
> >few seconds of recording.
> >
> >After compensating for the different sensitivities, at 12kHz I get a
> >noise level of -112 with the Rodes, -101dB with the EM23 and -97dB
> >with the AKG. But a significative difference is that the noise floor
> >is flat for the AKG and Rodes, while in the EM23 is not flat: -96dB
> >at 6 kHz and -110 at 40 kHz.
>
>I'm not sure that I understand....
>
>Klas.
To compare the recordings I normalized all to a same arbitrary peak
level (-6dB); this way all recordings have been processed. Then I
simply made the global spectra of each of them and overlaid all the
graphs. On the graphs I see the noise plateau of each recording. The
EM23 don't have the traditional white noise floor of many mics, but
something more similar to a pink noise.
Klas, I'll send you the graph privately.
Gianni
--------------------------------------------------------------
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
Web http://www.unipv.it/cibra
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