dc.contributor.author | Korneliussen, Rolf J. | |
dc.contributor.author | Diner, Noel | |
dc.contributor.author | Ona, Egil | |
dc.contributor.author | Fernandes, Paul G. | |
dc.date.accessioned | 2012-11-20T20:20:56Z | |
dc.date.available | 2012-11-20T20:20:56Z | |
dc.date.issued | 2004 | |
dc.identifier.citation | This report is not to be cited without prior reference to the authors | no_NO |
dc.identifier.uri | http://hdl.handle.net/11250/106431 | |
dc.description.abstract | Traditionally, collection of acoustic data has been optimised for a single frequency,
while requirements for the optimal combination of multifrequency data has been
given less attention. Even though data manipulation can enable single-frequency
data to be combined to some extent, optimal multifrequency comparisons cannot
be made from a system if the input data are not collected properly. Multiple
single-frequency [s(f)] data may be collected in various ways onboard research and
fishing vessels. For detailed analysis, the physical and spatial characteristics of
acoustic data should be as similar as possible. While direct comparability is
impossible in all aspects, ideal data is defined as a reference point for the collection
and analysis of multiple s(f) data. Acoustic data from several single frequencies are
defined as ideal in this context if they can be used to generate combined frequency
[c(f)] data at the same resolution as the original. This requires comparable physical
measurements, carried out simultaneously from identical volumes, limited only by
the effective range of the higher frequencies. Requirements necessary for recording
ideal multi-frequency acoustic data are presented. Consequences of combining
acoustic data originating from beams of different widths and separation distances
are also analysed and illustrated. | no_NO |
dc.language.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;2004/R:36 | |
dc.subject | acoustics | no_NO |
dc.subject | akustikk | no_NO |
dc.subject | management advice | no_NO |
dc.subject | forvaltningsråd | no_NO |
dc.title | Recommendations for the collection of multifrequency acoustic data | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 | no_NO |
dc.source.pagenumber | 15 s. | no_NO |