> In the Bioacoustic lab of our museum we are in a process of digitization
> and transcription of old analog recordings to compact discs. In this
> procedure we need a real time spectral analysis of recordings.
> Since in our acoustic lab we are using Mac computers, I am curious if
> somebody knows suitable software for this purpose.
I have written (actually modified) real time time-frequency spectrogram
procedures for use with IGOR Pro.
<a href="http://php.indiana.edu/~brsnelso/Igor/RealTime.html";
rel="nofollow">http://php.indiana.edu/~brsnelso/Igor/RealTime.html</A>
<a href="http://php.indiana.edu/~brsnelso/BSound.html";
rel="nofollow">http://php.indiana.edu/~brsnelso/BSound.html</A>
These procedures allow you to view a real time spectrogram display and
produce markers for time segments as they pass by (using a unique time
marker or other user defined text string plus the time marker).
You can then select each marker (i.e., time selection) individually from the
list of markers you have just produced and save the associated time
selections as sound files (AIFF format in MacOS, WAV format in Windows). You
can also step through each marker in the sequence in which they were
produced.
As a third alternative, you can save time selections from the display as
they go by (i.e., in real time; although you take the risk of missing new
stuff that might pass by while you are distracted).
The length of time you can view and mark before you have to stop and save
the marked selections will depend on the size of your hard disk. The
procedures are setup to save the spectrogram display in addition the sound
waveform and, as a result, a relatively large amount of space can be
consumed relatively quickly (depending on FFT size).
The user interface can be adapted easily to meet your specific needs and, in
sum, I can't think of a more efficient way to make the transcription that
you describe...
In addition, if you would like to produce a single long AIFF file that you
could then write to an audio format CD (as opposed to as series of
individual AIFF files in a normal file structure) you could easily modify
the procedures to append the waveform selections to a single long AIFF file.
***
I am assuming that you don't merely want to transfer the entire recordings
to CD as this would simply involve recording one long audio file and then
writing this file to a CD...
Brian
--
(((((((((((((((((
Brian S. Nelson
Indiana University, Dept of Biology
Jordan Hall 142, 1001 E. 3rd Street
Bloomington, IN 47405-3700
<a href="http://php.indiana.edu/~brsnelso";
rel="nofollow">http://php.indiana.edu/~brsnelso</A>
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