TitleA Fixed-Point Recursive Digital Oscillator for Additive Synthesis of Audio
Publication TypeConference Paper
Year of Publication1999
AuthorsHodes, T, Hauser, J, Freed, A, Wawrzynek, J, Wessel, D
Conference NameIEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
Date Published1999/03/01
Conference LocationPhoenix, AZ

This paper summarizes our work adapting a recursive digital resonator for use on sixteen-bit fixed-point hardware. Our modified oscillator is a two-pole filter that maintains frequency precision at a cost of two additional operations per filter sample. The new filters error properties are expressly matched to use in the range of frequencies relevant to additive synthesis of digital audio and sinusoidal modeling of speech in order to minimize the additional computational overhead. We present the algorithm, an error analysis, a performance analysis, and measurements of an implementation on a fixed-point vector microprocessor system.