Electroacoustic Feedback in Rectangular Reverberation Chambers.

摘要

The effect of introducing an electroacoustic feedback system into a rectangular reverberation chamber has been determined in the low frequency region by modeling the individual system components as time invariant linear systems. Both electrical and acoustical coupling configurations are discussed in terms of the steady-state response of the system to a monochromatic point source. Special consideration is given to the stability requirements of the feedback system and how these requirements affect the system as a whole. The results indicate that both the frequency response and the spatial variations of the sound field can be significantly altered if the appropriate feedback control function exists in the electric portion of the feedback channel. If this control function can be physically realized,the techniques described herein could be used to increase the precision of reverberation chamber measurements in the low frequency region.