Electronic devices are widely used today to add reverberation to sound. Ideally, such artificial reverberators should act on sound signals exactly like real, three-dimensional rooms. This is not simple to achieve, unless one uses a reverberation chamber or the electrical equivalent of a three-dimensional space. Reverberation chambers (and plates) are preferred by broadcast stations and record manufacturers because of their high quality and lack of undesirable side effects, but they are not truly artificial reverberators. In this paper, we shall focus our attention on electronic reverberators considting of delay-lines, disc or tape-delay, and amplifiers. Electronic reverberators are notably in the home (unless one wants to convert the basement into a reverberation chamber). They can also be employed to increase the reverberation time of auditoriums, thereby adapting them to concert hall use, without changing the architecture.
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