DE500 Sound Samples:
At first glance, using mobile cell phones as
a means of accessing a remote hydrophone might seem
less than perfect. Telephone bandwidth is normally
limited to 2500 to 3000 Hz. - hardly what you want to
use with your 300 KHz hydrophone!
In reality, most whale vocalizations fall
into the frequency range of 20 Hz to 3000 Hz which
is well within the capabilities of the worldwide telephone
network. Even some, high frequency echo location pulse
trains have frequency components that fall within this
To ensure maximum
applies a unique 'wave-shaping' characteristic to compensate
for transmission losses normally encountered in telephony.
Here are some examples
of what you can hear with the DE500. After listening
to them you'll be convinced that the DE500 can open new possibilities in
WORST CASE SAMPLE:
Let's start off with
the worst possible
to see how little is lost in transmission quality. This
originated using the DE500 tethered in a marina on the
coast of Cyprus - an island in the Eastern Mediterranean.
A long distance telephone call was placed between Cyprus
and the United Kingdom where the sounds were recorded.
It was then converted into a file using the lossy
GSM 6.10 format and sent back to our research facility
as an email attachment. In effect, the sounds
are twice as bad as you would normally expect using
long distance telephone access! Listen to it
for yourself -
it's mostly snapping shrimp with a few wavelets slapping
against the sides of boats, but you can hear the sharp
high frequency clicks come through with excellent quality.
If you dial up
and listen to the LIVE DEMO mentioned on the first page,
it will sound TWICE as good!
Marina Sounds: Recorded Live from UK
Here are some more
using transmission band- widths of 3500 Hz or less!
Dolphin Echo-location Clicks
Humpback whale songs