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    • Duel frequency echo data acquisition system for sea-floor classification 

      Navelkar, G.S.; Desai, R.G.P.; Chakraborty, B. (Allied, India, 2005)
      An echo data acquisition system is designed to digitize echo signal from a single beam shipboard echo-sounder for use in sea-floor classification studies using a 12 bit analog to digital (A/D) card with a maximum sampling ...