Background:
I have a great many two-channel (stereo) recordings. They contain the underwater sounds of a marine mammal captive environment and they were recorded on a 24/7 basis over many months. Vocalizations coming from one side (left) are quite common on these recordings. Vocalizations from the right were rather rare, and we now have great interest in screening our tapes in order to detect these rare, right-sided events.
I already have in place hardware and software for digitizing successive six-hour epochs as WAV files and passing the large files via a local network to a high-speed processor for analysis. However, I have not had luck in finding a suitable software package for screening these files in the way that I need.
Since these are stereo recordings from the same pool, any given vocalization appears on both the left and right channels. So, it will not be simply a matter of screening for events of a certain threshold on a single channel. It seems that I need software that can continuously compute a ratio between the left and right channel signal strengths and this ratio needs to feed into a triggering system (along with an ordinary intensity threshold feature) in writing out a time log of detected events. Alternatively, a program that was very sensitive to time-of-arrival differences between the two channels would presumably also prove useful.
I would be grateful for any advice, and I will summarize responses for the list.
Thanks in advance.
Mike Noonan
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Michael Noonan, PhD Professor, Biology and Psychology Canisius College Buffalo, New York 14208 t: 716-888-2518 e: [EMAIL PROTECTED] w: www.canisius.edu/~noonan/ w: www.conservenature.org
