> http://www.bbc.co.uk/news/science-environment-25185236
I listened to this and it simply doesn't have low frequency components. It
is a bit of sloppy journalism using terminology they don't understand. The
low frequency is a croaking, not a vocal chord vocalisation. This is obvious
after a LPF is applied. What we hear is a modulation, not a low frequency
sound. A Koala croak is no more unusual than a frog croak.
It is unusual and interesting sound but it is far from a "a low, rumbling
bellow" as described.
While I'm having a gripe, the BBC dub an artificial rumbling sound on every
shot of elephants. These animal use infrasound to communicate over long
distances but, by definition, this is inaudible. Besides they have no clue
as to whether each and every elephant is constantly emitting infrasound
calls as represented on TV. There even appears to be a standard BBC
concocted elephant rumble which is used every time.
David Brinicombe
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