Raimund,
it is difficult to say something about the spectrogram you show:
>http://www.avisoft-saslab.com/compression/MDtest2MD.gif
>
>As you can see clearly on the waveform, there is for sure no clipping at
>that location (the amplitude is much higher at the start of the call).
The "missing" harmonic maybe an artifact or maybe it is real.
To have a better view of what ATRAC or MP3 do on a recording I suggest to
plot the spectrogram with 96dB or more dynamic range: this way it is easy
to see all the portions that are cut by the system because "believed"
unaudible for the human ear. If the recording has a background noise, as
most nature recordings have, you'll easily see (and demonstrate) all the
"holes" created by psychoacoustic compression.
I'm sorry I can't now post an example.
Gianni
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Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia
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