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Abstract

The computer simulation of room reverberation has been shown to be of importance in the fields of computer music, architecture, and acoustics. The research described herein covers the use of recirculating delays to produce sounds like those of room reverberation, and the actual simulation of room acoustics by the phantom source method. To these ends, several new forms of recirculating delay reverberators were tested with the results that a comb filter with a low-pass filter in the loop produced results most consonant with the sounds of actual rooms. The low pass filter helps simulate the low-pass filtering effect of the air on the sound transmission in the room. It is later shown that no system consisting only of recirculating delays can reproduce exactly the response of a real room except in certain highly degenerate cases. An improvement is suggested using the simulated impulse response of the room for the early echos and recirculating delays for the late response. This provides the most satisfactory and natural sounding reverberation to date. A program was constructed to simulate the impulse response of natural rooms with certain geometrical restrictions. This program was used to gain insight into the process of reverberation and also to attempt to simulate exactly the early reverberation of a given hypothetical concert hall. Suggestions are made for the further improvement of the artificial reverberation, plus a design technique for artificial reverberation is given.

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Serveur © IRCAM-CGP, 1996-2008 - document mis à jour le 20/06/1997 à 11h03m40s.