I didn't mean to imply that the higher frequencies are always present.
It probably occurs under certain surface conditions of the rubbing
parts. It could also occur at anytime within the chirp. In the case
of crickets, the higher frequencies are probably an artifact and not
really important to the mating intentions of the cricket.
Ted
--- In dobroide <> wrote:
>
> Thank you Martin & Ted
>
> decreasing sample rate, nice trick. Definitely sounds very rubbing-like.
>
> Yet I'm not sure its coming from the crickets as it's not trully
> coincident with them. It may appear so because it's rhythmic:
> http://farm2.static.flickr.com/1199/769450999_a96f462149_o.jpg
> (BTW, strokes around 1 KHz are from a nightjar)
>
> The fact that there were so many crickets singing in the sample
> contributes to give the impression of synchronicity, yet other
> recordings I've done of one cricket singing singly show no ultrasonic
> components:
http://farm2.static.flickr.com/1073/769451023_688f4adb2a_o.jpg).
>
> I'm starting to think of some kind of Tettigonidae (bush cricket) or
> something, but who knows
>
> Regards
>
> D
>
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