Thanks for the explanation Dean and Laura, and to everyone else for chiming in.
I haven’t made spectrograms of short call notes for publication since the
Flight Call Guide back in 2001. I used Canary back then and the method for
generating spectrograms must have been different because there
Bill,
The Cornell folks could probably answer you more definitively, but I
think this is not a bug, but rather a result the way spectrograms are
generated. The spectrogram comes from sampling and analyzing successive
chunks of the waveform, so until enough time has gone by to encompass
the
It’s not a bug, it’s a deliberate design decision. The first spectrogram frame
takes N samples of audio data to compute; where should we say that the
spectrogram frame is centered, on sample 0 or in the middle at sample N/2? It
was decided that Raven would center the spectrogram frames on the
When I open a short night flight call wav file in Raven, the waveform window
begins at 0 sec but the accompanying spectrogram window doesn't begin at zero
-- it begins after a few milliseconds. See attached example.
It’s not something that one would note unless they are working with very short
