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Spectral Delay Filters
High- and low-order all-pass networks have been used extensively in a wide variety of audio applications, such as reverberators, because they change the phase and temporal structure without changing the frequency content. Each frequency region experiences an independent delay. In this paper the authors explore how these properties can be used to create unusual special effects. The perceived timbre is changed even though the frequency content remains unchanged. By cascading a large number of such filters, a chirplike sound can be created, which can be equalized and mixed with the original. This is yet another form of sound synthesis.
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