Gianni,
you may have a look at the DAT version that I already posted in a previous
message:
http://www.avisoft-saslab.com/compression/MDtest2DAT.gif
I agree, a full 96 dB dynamic range spectrogram display would reveal much
more =93holes=94. I deliberately limited the dynamic range in order not to
emphasize those tiny artifacts that are less annoying.
Raimund
> 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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> "Microphones are not ears,
> Loudspeakers are not birds,
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>
>=20
>
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