The Bergen echo integrator post-processing system, with focus on recent improvements

The Bergen echo integrator (BEI), which has evolved over many years, is a software system designed for convenient post-processing of echo-sounder data. BEI meets international standards and is essentially machine-independent. The development of BEI for the analysis of various scatterers such as zooplankton, pelagic fish, demersal fish and bottom is reviewed. The system design is described and the latest improvements are discussed. Among these improvements are the ability to quantify and remove noise, and a system that combines data at different acoustic frequencies for the generation and analysis of synthetic echograms. General operating procedures are described for the extraction of information while scrutinising and interpreting acoustical data.

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