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Reverberation is the persistence of sound after direct reception from the source has stopped. One of the spatial aspects of sound reproduction as manifested by reverberation is an important artistic attribute of reproduced music. There is an optimum reverberation time for every musical rendition. Thus, it will be seen that the reproduction of music may be enhanced when the reproduced sounds of music are below the optimum value of reverberation by the addition of appropriate amounts of reverberation. In this connection, it may be desirable to vary the reverberationcontinuously and thereby obtain the maximum artistic effect. The addition of reverberation in various degrees may be carried out by means of an artificial reverberation simulator. Reverberation in a room consists of multiple reflections of a number of large pencils of sound in which each pencil of sound suffers a decrease in intensity with each reflection. These conditions can be simulated by passing the reproduced sound through a series of transducers with progressive delay and attenuation. It is the purpose of this paper to describe a synthetic reverberator which provides an acousto-electronic means for introducing reverberation of different degrees of reproduced sound.
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