tailieunhanh - Báo cáo hóa học: " A Digital Synthesis Model of Double-Reed Wind Instruments"

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: A Digital Synthesis Model of Double-Reed Wind Instruments | EURASIP Journal on Applied Signal Processing 2004 7 990-1000 2004 Hindawi Publishing Corporation A Digital Synthesis Model of Double-Reed Wind Instruments Ph. Guillemain Laboratoire de Mécanique et d Acoustique Centre National de la Recherche Scientifique 31 chemin Joseph-Aiguier 13402 Marseille cedex 20 France Email guillem@ Received 30 June 2003 Revised 29 November 2003 We present a real-time synthesis model for double-reed wind instruments based on a nonlinear physical model. One specificity of double-reed instruments namely the presence of a confined air jet in the embouchure for which a physical model has been proposed recently is included in the synthesis model. The synthesis procedure involves the use of the physical variables via a digital scheme giving the impedance relationship between pressure and flow in the time domain. Comparisons are made between the behavior of the model with and without the confined air jet in the case of a simple cylindrical bore and that of a more realistic bore the geometry of which is an approximation of an oboe bore. Keywords and phrases double-reed synthesis impedance. 1. INTRODUCTION The simulation of woodwind instrument sounds has been investigated for many years since the pioneer studies by Schumacher 1 on the clarinet which did not focus on digital sound synthesis. Real-time-oriented techniques such as the famous digital waveguide method see . Smith 2 and Valimaki 3 and wave digital models 4 have been introduced in order to obtain efficient digital descriptions of resonators in terms of incoming and outgoing waves and used to simulate various wind instruments. The resonator of a clarinet can be said to be approximately cylindrical as a first approximation and its embouchure is large enough to be compatible with simple airflow models. In double-reed instruments such as the oboe the resonator is not cylindrical but conical and the size of the air jet is comparable to that of the embouchure. In this case .