tailieunhanh - Báo cáo hóa học: " Research Article Feedback Amplitude Modulation Synthesis"

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 Feedback Amplitude Modulation Synthesis | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 434378 18 pages doi 2011 434378 Research Article Feedback Amplitude Modulation Synthesis Jari Kleimola 1 Victor Lazzarini 2 Vesa Valimaki 1 and Joseph Timoney2 1 Department of Signal Processing and Acoustics Aalto University School of Electrical Engineering P O. Box 13000 00076 AALTO Espoo Finland 2 Sound and Digital Music Technology Group National University of Ireland Maynooth Co. Kildare Ireland Correspondence should be addressed to Jari Kleimola Received 15 September 2010 Accepted 20 December 2010 Academic Editor Federico Fontana Copyright 2011 Jari Kleimola 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 recently rediscovered sound synthesis method which is based on feedback amplitude modulation FBAM is investigated. The FBAM system is interpreted as a periodically linear time-varying digital filter and its stability aliasing and scaling properties are considered. Several novel variations of the basic system are derived and analyzed. Separation of the input and the modulation signals in FBAM structures is proposed which helps to create modular sound synthesis and digital audio effects applications. The FBAM is shown to be a powerful and versatile sound synthesis principle which has similarities to the established distortion synthesis methods but which is also essentially different from them. 1. Introduction Amplitude modulation AM is a well-described technique of sound processing 1 . It is based on the audio-range modulation of the amplitude of a carrier signal generator by another signal. For each component in the two input signals three components will be produced at the output the sum and difference between the two plus the carrier signal component. The .