抄録
Among several modules for counting of echo pattern of individual fish in the oceanic field, Module AMDESS is proposed in this paper. Some functions of this module are explained with several graphic examples. There are sever steps in AMDESS.
1) The main function of AMDESS is to design the mask from sets of echo elements (SUBSET) in each depth range.
2) SUBSETs of TYPE A and B2, reported in the previous paper of this series, are laid on the element map by the method of adjustment between map point and base point.
3) The right part (R part) of the mask is decided to be positions which have smoothing frequencies more than the limited value (Flmt) obtained from the maximum frequency (FMAX).
4) After setting the wrong part (W part) surrounding R part, the number of elements in W part is adjusted to that in R part by the conversion from W part to B part or the inverse process.
5) For example masks in five depth ranges were produced from SUBSETs, extracted beforehand and stored in MT, of RNO 056020 recorded in the cruise of Hakuho Maru in the South Pacific in 1969.
6) There were moderate variations between masks produced by four levels of acoustic transmissions (TNO=1000, 2000, 3000 and 4000) in the same depth range even from the same echo data.
7) Using masks designed by this module, echo patterns of RNO 056020 were counted on trial.
8) From these results, it is recognized that these designed masks are sufficiently useful to count echo patterns from field data.
