ABSTRACT
This chapter discusses reverb algorithms. There are two general ways to create the reverberation effect: reverb by direct convolution—the physical approach, reverb by simulation—the perceptual approach. The perceptual approach aims to simulate the reverberation with enough quality to fool the ears and give the same perception of real reverb, but with a much lower signal processing cost. The advantages are numerous from the minimal processing required to the ability to vary many parameters in real time. There are several key engineers who developed much of the theory in use. The first place to start is by examining impulse responses of actual rooms. There are several popular methods for capturing the impulse response, from cap pistols and balloons to de-convolution of chirp signals and pseudo-random sequences. One of the reverberator modules that Schroeder proposed is a simple comb filter.
