At 11:34 PM 6/7/2007, you wrote:
>Doug,
>
>I measure 120.02 pulses/sec! There's a pattern which never deviates,
>in which every "even" pulse has a low amplitude and ever "odd" pulse
>has a high amplitude ("even" and "odd" are arbitrary of course). This
>means the actual period of the sound is 60.01 Hz, which really
>strongly suggests to me that this is an electrical disturbance from a
>power line. I'm going to write a program to measure the
>moment-to-moment deviation in the pulse rate; perhaps this can shed
>more light on whether it is too regular to come from a living creature.
>
>Have you found any pattern to the circumstances under which this
>pulse shows up in your recordings?
Tree Crickets are very similar, often around 300 pulses/sec, and amazingly=
regular, like my sample.
>It would be nice if you could
>record this at a higher sample rate. At 44.1 kHz, its spectrogram is
>cut off sharply, so we're not hearing the complete sound when it's slowed=
>down.
I could record it, but the mic's not picking up anything over about 22,000 =
Hz.
>BTW, I had to struggle to find a program that could open
>insect_hi_freq1.wav... turns out it is 32-bit floating point.
Sorry, I shouldn't have left it at 32 -bit.
Thanks for your research, please let us know what you find.
Doug
***************************************
Doug Von Gausig
Digitally Recorded Birds Sounds at:
http://naturesongs.com/birds.html
Clarkdale, Central Arizona, USA
e-mail:
***************************************
|