Spectrogram Software

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.

REQUIREMENTS:

• OPERATING SYSTEM: Windows 95/98, or Windows NT 4.0.
• RAM: 16MB or more recommended. Will run in limited fashion with 8 MB RAM.
  
• DISPLAY: 256 colors recommended.
  
• SOUND CARD: Windows compatible sound card, or equivalent, to record and play back sounds. Not necessary to analyze computer files in .WAV format.