2010 Volume 34 Issue 3 Pages 241-248
The authors have developed a tool for presenting a sonic environment with the information of the sound sources as well as the sound levels. The sonic environment is expressed as a two-dimensional graphic chart named ‹Sound source×Sound level› Time-component Matrix Chart (abbreviated as TM Chart). In this study, we investigate the availability of the TM Chart by measuring the changes of sonic environments in a social experiment of a transit mall conducted in Kyoto. The conventional noise indices, i.e. LAeq, LAmax , LAmin and percentile sound levels detected the changes of the sonic environments at the only limited measuring points. The TM Chart, however, showed more detailed and visual information on the changes of the sonic environments with the percentage time of the sound sources and the percentage time of the sound levels.
