ACOUSTIC FEEDBACK AS A MODAL INVESTIGATION TOOL

被引：2

作者：

CURTIS, GJ

机构：

[1] Department of Physics, Imperial College of Science and Technology, London S. W.7, England

来源：

JOURNAL OF SOUND AND VIBRATION | 1969年 / 9卷 / 01期

关键词：

D O I：

10.1016/0022-460X(69)90268-5

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The modal-coupling behaviour of a microphone-amplifier-loudspeaker regenerative system in an auditorium at low frequencies is considered when the bandwidth of the system is severely limited to a few cycles by a Helmholtz resonator encasing the microphone. Restricted in this way the coupling process is more easily interpreted and it is possible to investigate how the system will principally regenerate a small number of modes, which change when the loudspeaker is moved in space. The system can plot" the spatial fluctuation in the antinodal surface of a small group of modes. Effects of changes in temperature and absorption are also investigated. The extent of spatial reverberation control at the principal regeneration frequency is described and compared with the natural variation in pure tone reverberation time. © 1969."

引用

页码：101 / &