Feedback and Adaptive Systems
This chapter explores a number of novel areas in sound synthesis and processing, where adaptive techniques are developed together with non-traditional uses of feedback systems. The text starts by discussing some applications of fixed feedback delay lines and the concept of waveguides. It moves on to look at pitch effects arising from variable delays, with which vibrato can be applied to arbitrary signals. This is then extended to audio-rate FM, giving rise to adaptive forms of FM/PM and related distortion techniques. The second part of the chapter takes a closer look at various forms of feedback modulation of amplitude and frequency, as well as the principles of periodic time-varying filters. Code examples in Csound and Faust illustrate each technique discussed.
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