Dolphin Phone let you eavesdrop on a magical world ... the realm of the not-so-silent ocean depths. But it's more than just a 'snooping' device. Dolphin Phone is similar to scientific hydrophones costing many thousands of dollars.
All of the above are
included in the Dolphin Phone Package! The
only other thing you need is a 9 volt battery and an OCEAN ... or lake
... or river ... or pond
USING DOLPHIN PHONE:
1. Select a location,
2. Put the hydrophone in the water,
3. Slip on the earphones,
4. Turn it ON!
It's that easy to use! IDEAL for KIDS: Fun and Educational - Great for Science Projects
Great for ADULTS too!
WHERE TO GO:
WHAT WILL YOU HEAR?
Some places are very quiet; some a sonically 'alive'. You will have to experiment to find the best places. While listening to whales and dolphins is lots fo fun, there are many other creatures which make sounds underwater. Remember also, that before Dolphin Phone came along, listening to underwater sounds was an expensive and time consuming proposition. You may discover underwater sounds that have never been heard! You may also find links between sounds and various habitats. For example, we wonder why 'snapping shrimp' seem to prefer boat marinas where pollution and toxic bottom paints abound, over cleaner waters just outside the entrance. If you want to explore our last earthly frontier, dolphin phone will open up a whole new dimension.
You will probably hear more than you will see with whales. Listen to whales as they dive and search for food. Different whale specied tend to emit different noises and scientists are trying to determine the exact meaning of the different sounds. This is an area where 'amateur scientists' using a Dolphin Phone can contribute greatly to the general knowledge about the meaning of these 'vocalizations'.
When you get out from the shore on a boat, many of the interfering sounds found close to shore disappear and you are able to hear sounds much further away.
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.
Each Dolphin Phone comes with a free software to produce your own SPECTROGRAMS. It allows you to 'see' underwater sounds and analyze their content. It's a great program written by Richard Horne and generously made available to us for inclusion with Dolphin Phone. It produces graphicssimilar to the type of 'waterfall displays' used by SONAR operators on U.S. Navy Nuclear Submarines to detect and indentify underwater sounds.
WHAT'S A SPECTROGRAM?
'Most ordinary sounds are complex combinations of individual frequency components or harmonics with a wide range of frequency and intensity. A spectrogram is simply a plot of the frequency components of such an audio signal as a function of time. In this Spectrogram program, digital audio recordings (.WAV format) are analyzed to produce a plot of frequency versus time, with harmonic intensity represented by a variable color scale. These spectrograms reveal the fascinating hidden frequency structure of audio signals and can be used for identifying or classifying particular sounds.'
Look at the samples in our 'SOUNDS' section - all of which were processed with this software! Frequency resolution is typically 20 hz or less! Placing the crosshair cursor over any point on the spectrogram shows time, frequency, and level data in a special 'data' window. If desired, you can also save your spectrogram sample as a set of data points for analysis by other programs.
REAL TIME DISPLAYS
The software allows you to display underwater sounds in real time, or from previously recorded tapes. You can also record 'digital recordings' of underwater sounds and save them on your computer hard disk. These features provide many possibilities. It is not necessary to carry your computer into the hostile marine environment to see carry on spectrographic analysis. You can record sounds on a simple ausio cassette recorder, DAT, Camcorder or other sound recorder, then play the tape back into the computer for analysis at a later time. See our 'RECORD' page for futher details.You can also watch realtime display indefinitely and start a digital recording when something of interest is heard.
Dolphin Phone makes a great underwater microphone for your video
camera, audio cassette recorder, or DAT (Digital Audio Tape) recorder.
Now you can hear whales and dolphins as well as seeing them on your videos!
The physical connections will depend on your equipment. Dolphin Phone uses a standard 1/8 inch ( 3.5 mm ) stereo jack for earphones. Both LEFT and RIGHT channels are the same - providing MONO output for your recorder. Simply use the appropriate connecting cord to your equipment. You may connect to either the MICrophone input or LINE IN jacks on your recording equipment. Volume level is adjustable using the Dolphin Phone volume control.
If desired you can add a dual stereo plug adapter - costing about $ 1 - so you can both listen to the Dolphin Phone and record at the same time. Visit any electronics store for the cables for your equipment.
Let's talk about audio recorders. We will leave video camcorders out of this discussion because you choose those for their video quality, size, and features - not their audio or sound capabilities. Dolphin Phone works great with all video gear.
Audio recorders come in several forms - reel-to-reel, cassette, mini-cassette, DAT (Digital Audio Tape) and DCD (Digital Compact Disk). There are comsumer grade models and there are professional models. Prices range from $29.95 to well over $10,000 depending on quality and features. There is a good article available from the Society of Amateur Scientists called Recording Nature's Sounds - check it out after you have finished this article.
For general purpose recording of underwater sounds, I suggest you start off simply. Go down to your local electronics shop and look at INEXPENSIVE Cassette recorders. Stay with the full sized cassettes - not the mini variety made for dictation. Here's a guide to some of the more critical specifications you will see in a catalog, or at the store:
You can always upgrade to better, more expensive recorders when you have gained some field experience. Use a good quality audio tape for best results. A recorder with a 'counter' is nice and lets you keep notes of where and when the recording was made.
Plan a dolphin phone outing visiting some of the places mentioned in our WHERE?page. When you return, play back the tape through your computer sound card, making an audio file (.wav format) that you can process and view with the spectrogram program that comes free with dolphin phone.
Dolphin Phone is now shipping. We are clearing our order backlog. If you would like to reserve one for delivery before Christmas, please fill in the form below. We will inform you by email when they are available.
FAX (From U.S. and Canada): 011 + 44 - 190 - 864 5387
(Inside U.K.) (01908) 645387
(Internationally): +44 1908 645 387