Universitą degli Studi di Pavia

Centro Interdisciplinare di Bioacustica e Ricerche Ambientali

Via Taramelli 24 - 27100 Pavia - Italy
e-mail : cibra@unipv.it

SeaWave - Sound Emission Analyzer Wave edition

SeaWave is a light version of the SeaPro package. It is free! Developed by CIBRA and AEST, it offers most of the functions and capabilities of SeaPro; it runs up to 200kHz in all windows versions, including XP, and up to 250kHz in Windows Vista/7 for both real-time spectrogram visualization and continuous recording to disk. This free version has some limitations, however it can satisfy most user needs. Recording  functions are limited to single file recording with 680MB max file size. Other limitations are about the advanced settings panel for fine tuning the aspect and behaviour of the program and for saving/restoring the user configuration.

This SeaWave edition supports the Dodotronic UltraMic200k and UltraMic250k, special ultrasonic microphones with integrated 200 or 250 kHz AD converter and high-speed USB port. They are great for recording ultrasounds up to near 90 or 120kHz (bats, rodents, insects....), depending on the model. The 200k model is compatible with Windows XP and latest versions. The 250k model, that is not compatible with Windows XP and earlier versions, allows to cover all bat species, including horseshoe bats (Rhinolophidae). To know more about the UltraMic compatibility with other operating systems visit the Dodotronic web papges. 
the Dodotronic UltraMic250k is not compatible with SeaWave in Windows 8/8.1 - a patch to solve the problem is being developed.

The UltraMics don't require a driver, just connect to a USB 2.0 port, run SeaWave, choose the  UltraMic as input device, and set the proper sampling rate! They work well even on netbooks and tablets with the Atom cpu.

For Linux and Mac users: SeaWave and the UltraMics work well in virtual windows under both Linux and Mac OSX (VMWARE and PARALLELS have been positively tested). Another simpler option is to use the CrossOver utility to "encapsulate" SeaWave and make it appearing as a Mac App.

UltraMic connected to a 7" Tablet PC

Updated July 2, 2011

Software developed by Gianni Pavan © 1998-2011

The use of this software is free of charge for personal non commercial and non professional use.
Please consider the SeaPro package for professional use.

This version of the software can be redistributed. Any public use, including web pages, which include spectrograms made with this software must include suitable references and acknowledgements to the Author. In case of doubts, please write.

Read a nice review made by Al Milano

Bug reports, users' feedback and hints for new features are welcome.

SeaWave history - List of updates

SeaWave 2 released on March 2011
added 200k sampling rate to support the UltraMic200k

May 6, 2011
enabled Buffer option to save the last 30s, 60s or more, while not recording
added 192k sampling rate

July 2, 2011
added 250k sampling rate to support the new UltraMic250k

Beta version under test at CIBRA, not released yet:

added a spectral trigger feature to allow automatic recording to wav file only when there are bat calls! By properly setting the frequency range and the dB threshold a bit above the background noise, your PC will be able to record unattended for hours or weeks. Every morning you'll find on your hard disk the timestamped wav files.... maybe hundreds of files that will show you all echolocating bats that flew and catched preys in the detection range of your sensor.
This new version will be released soon.

Spectrogram gallery - Download the images to see them at full resolution.

Bat sounds

A special thank to Marco Pesente for the valuable recording of bats (Pipistrellus kuhlii and Eptesicus serotinus - the lowest in frequency; probably a third species is also present...) made with the Dodotronic UltraMic200k.

Details (at different time resolution) and overview (compressed timeline) of a long sequence of calls to show the presence of two bat species. The red parts of the envelope show overloaded signals. 

The compressed timeline can be easily obtained by setting a long analysis window (e.g. 8192 or 16384 samples), this forces the FFT to the same size, and by setting the scan step to half the length of the window. A further packing can be obtained by setting the windows type to Linear and the scan step to the same size of the window.  

Samples made with the UltraMic250 and the new automatic recording software:

A sequence of bat calls recorded with the UltraMic250k, gain set to low.

A sequence of bat calls recorded with the UltraMic250k, gain set to medium. Horizontal lines are due to noise from an LCD monitor.

Home Page of the Centro Interdisciplinare di Bioacustica e Ricerche Ambientali

Page compiled by Gianni Pavan, last update October 2012.