Title :
Colouration in assisted reverberation systems
Author :
Poletti, Mark A.
Author_Institution :
Ind. Res. Ltd., Lower Hutt, New Zealand
Abstract :
Assisted reverberation systems are used to electronically enhance the reverberation time of an auditorium. A limitation of such systems is that they produce enhanced room transfer functions that contain unnaturally large peaks. These peaks produce colouration of the sound decay. A stochastic simulation technique is presented that quantifies colouration by measuring the probability density function of the transfer functions and comparing it with the ideal Rayleigh distribution of an unassisted room. The technique is applied to existing reverberation systems, and to a new system which provides large increases in reverberation time without increasing the loop gain. It is shown that, for the same power gain, the new system produces a higher colouration, but that this problem may be eliminated by the use of an allpass reverberator
Keywords :
acoustic signal processing; acoustic wave reflection; architectural acoustics; musical acoustics; reverberation; stochastic processes; transfer functions; Rayleigh distribution; allpass reverberator; assisted reverberation systems; auditorium; colouration; loop gain; power gain; probability density function; reverberation time; room transfer functions; sound decay; stochastic simulation technique; unassisted room; Absorption; Acoustic signal detection; Control systems; Electronics industry; Loudspeakers; Microphones; Reverberation; Stochastic processes; Transfer functions; Wideband;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.389668