It wouldn't take an expert, Anthea, there are free programs out there for just
that. However, spectrograms aren't a full representation of any sound, and
sounds reconstructed from them always sound recognisably different. Given that
it appears that the bird barely responds to a recording of its own call, I
doubt a reconstructed one would get any response.
The programs I've seen that will do this have as their prime purpose the
generation of amusing sounds - e.g. hear what your written name would sound
like if it was a spectrogram - not the reverse engineering of bird calls.
John only has to tweak the spectrogram to lose some of the harmonic bands, and
the resulting reconstruction would sound quite different. The spectrogram would
then only be of use to those trying to analyse existing recordings, of which
there are, apparently, many thousands of hours.
I don't think this fear is justified.
Peter Shute
> -----Original Message-----
> From: brian fleming
> Sent: Monday, 2 March 2015 10:14 AM
> To: Peter Shute;
> Subject: Re: [Birding-Aus] John Young's Melbourne Night
> Parrot talk last night
>
> Brian and I hope that John Young will NOT release a
> spectrogram of the Night Parrot's call. It would be possible
> for an electronic expert to re-engineer a replica of the
> bird's call from that information, and then try to call up
> the bird with it. Which for such a very shy bird might be fatal.
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