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You are so right! A full hydrophone array is the start for automatic analysis and and display data. (Also a desired end goal of mine!) With a good array and timely proper sampling, an easy to interpret visual display would be a great way to notify you of areas that might contain interesting things to listen to. Transients which happen quickly would not go unnoticed either. David Bartsch Date: Sun, 12 Jul 2009 23:18:53 -0600 From: cast55@telus.net To: personal_submersibles@psubs.org Subject: Re: RE: [PSUBS-MAILIST] passive hydrophone array pictures! I haven't been following your hydrophone design effort very closely, but I had a look at the photos you posted, and I was wondering why you would mechanically / electrically select a particular hydrophone to listen to? A multiple receiver array of directional hydrophones like that seems ideally suited to computerized monitoring whereby every transducer signal is monitored simultaneously, and target direction could be determined from SNR of every hydrophone in the array, FFT performed to identify particular targets, configurable filters applied, and an audio stream for user monitoring provided by mixing all signals - again shapable by software filter, so you could listen in a particular direction if you wanted to, but significant sound sources would be automatically located. The hardware to do this wouldn't be much more than a single board computer with analog input data aquisition, and having the processing ability available means you could filter out the boat traffic above to listen to the whale song below - good cruising music. ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************ Insert movie times and more without leaving Hotmail®. See how. |