Abstract
An electronic method for lengthening the reverberation times of auditoria has been developed. It is called “assisted resonance” and consists of a large number of microphone-amplifier-loudspeaker “channels” which are so positioned in space and adjusted in amplitude and phase that each one prolongs the reverberation time at one frequency. An experimental system consisting of 89 such channels covering the frequency range 70 to 340 c/s has been successfully used to lengthen the low-frequency reverberation time in the Royal Festival Hall.
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