Archives of Acoustics, 22, 3, pp. 219-244, 1997

Articulation-related features in the pipe organ sound

B. Kostek
Sound Engineering Department, Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, 80-952 Gdańsk, ul. Narutowicza 11/12
Poland

Investigations in the domain of sound growth in organ pipes resulted in describing some of the articulation-related features. An equivalent electrical circuit of an organ action was created basing on computer modeling techniques. The response characteristics of the circuit were obtained numerically and are discussed. The concept of an organ action governing a digitally controlled valve is proposed and examined. A comparison between the response characteristics of the equivalent electrical circuit, the tonal characteristics of an exemplary pipe and characteristics obtained through the analytic modeling of pipes is presented and discussed. Numerical simulations are found to be in good conformity with experimental results. Among the latest electronic hardware achievements, the fuzzy logic-based knowledge acquisition and control system seems to be a capable tool for solving the problem of control of the electromagnetic valve of the organ pipe. A model of a pipe organ with a fuzzy logic-based control system was designed, constructed and investigated. Results of studies and experiments in the domain of pipe organ valve control are presented in the paper.
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