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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Real-Time Guitar Preamp Simulation Using Modified Blockwise Method and Approximations Jaromir Macak and Jiri Schimmel | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 629309 11 pages doi 10.1155 2011 629309 Research Article Real-Time Guitar Preamp Simulation Using Modified Blockwise Method and Approximations Jaromir Macak and Jiri Schimmel Faculty of Electrical Engineering and Communication Brno University of Technology 61600 Brno Czech Republic Correspondence should be addressed to Jaromir Macak jaromir.macak@phd.feec.vutbr.cz Received 14 September 2010 Revised 12 December 2010 Accepted 27 January 2011 Academic Editor Vesa Valimaki Copyright 2011 J. Macak and J. Schimmel. 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. The designing of algorithms for real-time digital simulation of analog effects and amplifiers brings two contradictory requirements accuracy versus computational efficiency. In this paper the simulation of a typical guitar tube preamp using an approximation of the solution of differential equations is discussed with regard to accuracy and computational complexity. The solution of circuit equations is precomputed and stored in N-D tables. The stored values are approximated and therefore different approximation techniques are investigated as well. The approximated functions are used for output signal computation and also for circuit state update. The designed algorithm is compared to the numerical solution of the given preamp and also to the real preamp. 1. Introduction The real-time digital simulation of analog guitar effects and amplifiers has always been unfortunately a compromise between accuracy and speed of a simulation algorithm. There are many different approaches to the simulation such as a black box approach a white box informed approach circuit-based approaches and so forth 1 . All these algorithms differ in accuracy of the simulation as well
