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Lazzarini, Victor
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Streaming Spectral Processing with Consumer-level Graphic Processing Units
Abstract
This paper describes the implementation of a streaming spectral processing system for realtime audio in a consumer-level on-board GPU (Graphics Processing Unit) attached to an off-the-shelf laptop computer. It explores the implementation of four processes: standard phase vocoder analysis and synthesis, additive synthesis and the sliding phase vocoder. These were developed under the CUDA development environment as plugins for the Csound 6 audio programming language. Following a detailed exposition of the GPU code, results of performance tests are discussed for each algorithm. They demonstrate that such a system is capable of real- time audio, even under the restrictions imposed by a limited GPU capability.