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These are sounds you might hear while using Dolphin Phone. Just click on the title. Each is shown with its sound spectrogram. Spectrograms show sound structure; like fingerprints no two are exactly the same. . Frequency is represented on the vertical scale. Time is shown on the horizontal scale. Intensity is indicated by the color. Black represents a level of -90 db; Red - 0db. The Yellow area above the spectrogram shown the amplitude.
The software to produce spectrograms is included free with each Dolphin Phone package. It's a great tool for investigating underwater sounds - and more interesting than cable TV! Checkout our BONUS SOFTWARE page for further information.
| This is the spectrogram of a boat at a range of approximately 200 metres (650 feet). The skipper is rev'ing the engine while warming it up. Listen carefully to the sound sample and you can hear the pistons operate! As the engine rev's you can see a very clear 'whine' centered around 640 hz. You can also hear 'snapping shrimp' in the background. (mostly showing as a light 'blue' color)
Sounds are clearly picked up all the way down to 1-2 Hz, showing the quality of the DolphinPhone hydrophone! Human hearing has a lower limit of about 18-20 Hz, so using DolphinPhone with the Spectrogram Program lets you 'see' sounds you normally cannot hear. This is a useful feature if you go hunting for long range (up to 100-150 Kilometres) whale vocalizations.
This sample was made using an inexpensive cassette recorder ($40). DolphinPhone was connected to the MIC INPUT jack.
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