aDetmold University of Music
balexis baskind music production
Abstract :
Measurements in anechoic conditions are affected by the
measurement set-up itself. The presence of grids, stands,
turntables and the human body introduces reflections,
diffraction, absorption and more changes to the ideally free
field conditions. The impact of such equipment on directivity
measurements is often neglected, and artefacts are are easily
mis-interpreted as features of the source directivity. In an
anechoic chamber several setups are compared with respect
to changes in the measured directivity of a simplified musical
instrument. The differences of the 1/r amplitude decay as well as
the resulting directivities are presented and discussed.