ACOUSTIC SOFTWARE FOR PCS (IBM compatible)
There is a wide range of software available for acoustic analysis. Some examples are listed here, as well as links to other sites that provide more lists of software. Some programs are free and can be downloaded from the web sites shown. Others vary in price depending on capability, and usually it is possible to download a demonstration version that allows you to try out the software at no cost. Only very brief descriptions are given here: full descriptions are available at the individual web sites shown. Note that this list contains only the few programs that I am familiar with and there is no reason to suppose that these are any better than other programs available – you are advised to check out all the links to other software.
These programs analyse files made with PC sound cards (.wav extension), and the signal as it comes into the sound card in real time, unless otherwise stated.
The files available for downloading are usually compressed, either as .exe files or .zip files. Ones with extension .exe just have to be run to produce the files you need for the software. Ones with extension .zip need to be unarchived with pkunzip.exe, or Winzip.
SPECTRUM ANALYSER (Freq51) and SPECTROGRAM (Specgrm2)
These are two analysis programs from the Biomedical Ultrasonics Laboratory at the University of Michigan and are available for DOS or Linux. The Spectrum Analyser (Freq51) gives power spectrum levels as a function of frequency and can be set it up to read absolute values (e.g. dB re 1 volt) if you calibrate your sound card. Spectrogram (Specgrm2) gives a real time full screen spectrogram (sonagram) with a choice of various colour combinations. These programs analyse the incoming signal in real time but do not analyse stored files. They have a wide range of settings for sampling rate, FFT points, averaging time etc, so are very versatile. The DOS version can be run under Windows 95. You need to read the text file and set the switches for the sound card etc.
The web site is:
UNIVERSITÀ DEGLI STUDI DI PAVIA SOUND ANALYSIS SOFTWARE by Gianni Pavan (free)
This is DOS based software intended for analysis of bioacoustic signals, particularly spectrograms and wave forms. They report that a Windows version will be available soon, though will not be free.
SPECTROGRAM/GRAM (v5.1.7) by R.S. Horne (free)
This is a
Windows program which produces spectrograms in real time or from files,
does some spectral analysis. There have been regular improvements by
in response to feedback, resulting in a very useful spectrogram
display. The web
AVISOFT SASLab by R. Sprecht
(Light version is free, Pro version costs about 2700 Deutsche Marks)
Avisoft-SASLab Light is freeware for basic editing of wave form and production of spectrograms. Avisoft-SASLab Pro provides a wide rang of functions, particularly spectrograms and wave form analysis. The Pro version can produce a continuous spectrogram displayed as a series of strips across the screen displaced vertically (each strip spectrogram follows on from the one above) so that a long time record can be viewed at once. It also provides cross correlation of sonagrams. The web site is:
COOLEDIT by David Johnston
(Cool Edit 2000 for US$69 and Cool Edit Pro for US$399).
These provide a wide range of recording and editing manipulations of sound files. The Pro version has a much wider range of functions, though some of these can be added to Cool Edit 2000 as optional extras. Apparently intended for music applications, many of the features are useful in acoustic analysis. For example, you can edit out noise clicks by using the mouse and the delete key with a wave form on the screen. You can filter the data by specifying a filter response as a function of frequency, and applying that to a signal. It also produces spectrograms.
Goldwave provides a range of audio recording and editing tools of sound files. http://www.goldwave.com/release.html
ACOUSTIC SOFTWARE FOR MACINTOSH COMPUTERS
CANARY 1.2.4, THE CORNELL BIOACOUSTICS WORKSTATION (about US$250)
Produced by the Bioacoustics Research Program, Cornell Lab of Ornithology. I have no experience with this but it is widely used for bioacoustics analysis.
LINKS TO OTHER LISTS OF ACOUSTIC ANALYSIS SOFTWARE
Dolphin Study Group, National University Of Singapore
R.S. Horne: http://www.monumental.com/rshorne/links.html
Steven Hopp: http://eebweb.arizona.edu/faculty/hopp/sound.html