TAILIEUCHUNG - Báo cáo sinh học: " Review Article Analysis, Synthesis, and Classification of Nonlinear Systems Using Synchronized Swept-Sine Method for Audio Effects"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Review Article Analysis, Synthesis, and Classification of Nonlinear Systems Using Synchronized Swept-Sine Method for Audio Effects | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 793816 8 pages doi 2010 793816 Review Article Analysis Synthesis and Classification of Nonlinear Systems Using Synchronized Swept-Sine Method for Audio Effects Antonin Novak Laurent Simon and Pierrick Lotton Laboratoire d Acoustique Universite du Maine UMR CNRS 6613 72000 Le Mans France Correspondence should be addressed to Antonin Novak Received 1 March 2010 Revised 16 June 2010 Accepted 5 July 2010 Academic Editor Mark Sandler Copyright 2010 Antonin Novak et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. A new method of identification based on an input synchronized exponential swept-sine signal is used to analyze and synthesize nonlinear audio systems like overdrive pedals for guitar. Two different pedals are studied the first one exhibiting a strong influence of the input signal level on its input output law and the second one exhibiting a weak influence of this input signal level. The Synchronized Swept Sine method leads to a Generalized Polynomial Hammerstein model equivalent to the pedals under test. The behaviors of both pedals are illustrated through model-based resynthesized signals. Moreover it is also shown that this method leads to a criterion allowing the classification of the nonlinear systems under test according to the influence of the input signal levels on their input output law. 1. Introduction Various classical analog audio effects fall into the category of nonlinear effects such as compression harmonic excitation overdrive or distortion for guitars. Digital emulations of nonlinear audio effects can be obtained when using a suitable nonlinear model. Such nonlinear models are available in the literature for example Volterra model 1 neural network model

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