Abstract
A theoretical study of spatial sound equalisation in an extended
region in a room has been carried out. The purpose is to reproduce
sound without significant spatial fluctuations and to minimise the
spectral colouration at low frequencies in a specified region of
the room. The problem is first studied by means of an idealised
frequency domain model. The analysis is based on the calculation
of the complex source strengths that minimise the difference
between the actual sound pressure and the desired sound pressure
in the listening area. Results in relation to the position of the
sources, the frequency range, and the size and location of the
listening area are presented. However, the frequency-domain
approach results in non-causal impulse responses that can be
realised only at the expense of a delay. Therefore, this analysis
is supplemented with a study of the equalisation carried out in
the time domain. Here, a solution constrained to causality is
determined. The duration of the impulse response should be
minimised as well in order to avoid echos, which are undesirable
in the reproduction of transient signals. This
causality-constrained equalisation is compared with the optimal
solution obtained in the frequency domain.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the Fifth International Congress on Sound and Vibration |
| Place of Publication | Auburn, AL |
| Publisher | The International Institute of Acoustics and Vibration |
| Publication date | 1997 |
| Pages | 287-294 |
| Publication status | Published - 1997 |
| Event | 5th International Congress on Sound and Vibration - Adelaide, Australia Duration: 15 Dec 1997 → 18 Dec 1997 Conference number: 5 |
Conference
| Conference | 5th International Congress on Sound and Vibration |
|---|---|
| Number | 5 |
| Country/Territory | Australia |
| City | Adelaide |
| Period | 15/12/1997 → 18/12/1997 |