A preliminary investigation into the measurement of time and frequency response of listening rooms and control cubicles

摘要

The effects of 'early' reflections in a room on the perceived sound quality from loudspeakers are discussed, with particular reference to small rooms. Such reflections occur because surfaces within the rooms and the room boundaries themselves are not perfectly absorbing at all audio fre¬quencies. In the majority of cases, for example listening rooms and sound control rooms (cubicles), most of the surface of the walls at least is covered with some form of sound absorbing treatment but, as this is invariably fre¬quency selective to some extent, it only serves to further colour the per¬ceived sound because the reflected sound is itself coloured.nOne method of describing the overall acoustic of any room is by measuring the sound pressure level at a prescribed listening position as a function of both time and frequency. A number of techniques for obtaining this three-dimensional response are described and results presented for two rooms using one of these techniques.