Passive Acoustic Monitoring - PAMBuoy's evolution
Marine mammals produce a wide range of sounds from low frequency moans, such as those of the blue whale, to high frequency echolocation clicks of harbour porpoises. PAM is the simple process of listening for these sounds, often using a hydrophone and an appropriate acoustic processing system, normally a soundcard and a PC.
From the initial analog based detection systems, PAM has evolved with the revolution in PC microprocessors. This has allowed ever more complicated software detection systems, with more digital signal processing (DSP) capacity available.