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 Efficient Dispersion Generation Structures for Spring Reverb Emulation | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 646134 8 pages doi 2011 646134 Research Article Efficient Dispersion Generation Structures for Spring Reverb Emulation Julian Parker Department of Signal Processing and Acoustics Aalto University 02150 Espoo Finland Correspondence should be addressed to Julian Parker Received 22 September 2010 Revised 21 December 2010 Accepted 9 February 2011 Academic Editor Federico Fontana Copyright 2011 Julian Parker. 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. Spring reverberation is a sonically unique form of artificial reverberation desirable as an effect distinct from that of more conventional reverberation. Recent work has introduced a parametric model of spring reverberation based on long chains of allpass filters. Such chains can be computationally expensive. In this paper we propose a number of modifications to these structures via the application of multirate and multiband methods. These changes reduce the computational complexity of the structure to one third of its original cost and make the effect more suitable for real-time applications. 1. Introduction Spring reverberation is an early method of artificial reverberation first proposed by Hammond in the 1940s 1 . Standard spring reverberators consist of a configuration of one or more springs in parallel. Each spring has magnetic beads attached to its ends. Torsional motion is excited in the spring wire by applying an input signal to an electromagnetic coil which then exerts a force on the magnetic bead at one end of the spring. At the opposite end of the spring the movement of the magnetic bead induces a current in another electromagnetic coil producing an output signal. Spring reverberation gained popularity in the late .
