Processing of Fish Echo-Signals for Classification Purpose
Echo-sounding is extensively used during acoustical sea-surveys. Two techniques permit us to process the received echoes in order to estimate fish densities: echo counting and echo integration (evaluation of signal energy). However, it is necessary to know the nature of insonified fishes to interpret the data given by these techniques. We propose to study the characteristics of echoes by means of digital processing without a priori information on the scattering bodies. At first, we digitilize and compact the recorded signals, then pertinent parameters are extracted from the echoes, afterwards, their statistical properties are studied.
KeywordsDirect Memory Access Target Strength Data Analysis Algorithm Underwater Acoustic Signal Marine Fish Population
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- 1.K.A. Johannesson, R.B. Mitson, “A Practical Manual for Aquatic Biomass Estimation”, FAO Fish. Tech. Pap. No. 240, Rome, 1983.Google Scholar
- 2.R. Person, E. Marchal, T. Terre, J. Berthe, “Systeme d’echointégration numérique pour 1’évaluation des stocks AGENOR”, Paper No. 17, presented at Fisheries Acoustics: a symposium held in Bergen, Norway, 21–24 June 1982.Google Scholar
- 3.J. E. Ehrenberg, Paper No. 104, “A review of in situ target strength estimation techniques” in Fisheries Acoustics: A symposium held in Bergen, Norway, 21–24 June 1982.Google Scholar
- 4.D.Q.M. Fay, “Digital Computer Analysis of Echo-Sounder Data for Fish Identification”, in Proceedings of the Conference, Acoustics in Fisheries, held at the Hull College of Higher Education, Hull, England, 26–27 Sept. 1978. ( Pub. by Univ. of Bath, Bath, UK)Google Scholar
- 7.A. Giryn, M. Rojewski, K. Somla, “About the Possibility of Sea Creature Species Identification on the Basis of Applying Pattern Recognition to Echo-Sounder Signals” in Proceedings of the Meeting on Hydroacoustical Methods for the Estimation of Marine Fish Population, 25–29 June 1979, Vol II, J.B. Suomala Ed. pp 455–466.Google Scholar
- 8.A. Giryn, K. Somla, M. Rojewski, “The Number Parameters of Echo Sounder Signals with Respect to their Usefulness to Sea Creatures Species Identification” in the Proceedings of the Meeting on Hydroacoustical Methods for the Estimation of Marine Fish Population, 25–29 June 1979, Vol. II, J.B. Suomala Ed., pp 467–489.Google Scholar
- 9.A. Giryn, “The New Approach to the Biomass Measurement of Hydrocoustic Methods based on Probability Distribution of Creature Weights and the Echo Signals”, in the Proceedings of the Meeting on Hydroacoustical Methods for the Estimation of Marine Fish Populations, 25–29 June 1979, Vol. II, J.B. Suomala Ed., pp 491–494.Google Scholar
- 10.M. Azzali, “Regarding the Possibility of Relating Echo Signal Features to Classes of Marine Organisms: Tests carried out in the north and middle Adriatic Sea”, Paper No. 23 presented at Fisheries Acoustics: A symposium held in Bergen, Norway, 21–24 June, 1982.Google Scholar