Abstract
An index of sound recognition of an area, i.e. LSRC5/2, has recently been developed through reanalyzing a matrix composed of the results of 1240 respondents placed in rows, and responses to 39 sounds in columns. This was done by arranging the answers to questions in a questionnaire survey carried out by random sampling at Yokohama city in 1991. The index is a reproduction from a trail of sound environments in daily lives based not on measured acoustic data but on the recognition of the long-term memories of respondents. It indicates the level of ambiguity to our total sound environments. The index will become a useful target for land use planning, travel demand management, life enjoyment, and so on.
