Tutor: | Stefan Goetze |
Type of Thesis: | Diplomarbeit (Dipl.) |
date of end: | 07/2007 |
Student: | Raphael Knoop |
Status: | finished |
ANT-shelfmark: | D-07/07-1 |
Abstract: | The sampling technique is widely used in digital church organs to reproduce the sound of a classical pipe organ and makes it possible to build digital church organs with a very natural sound. For the human hearing the first few milliseconds of a sound - the attack section - are very important to identify the character of the sound. In case of an organ pipe in the attack section the partial tones of the sound are coming in but also some noise caused by turbulent streaming which decreases over time. Organ builders call this 'the chiff' of the pipe. While the chiff has a very dynamic and transient behaviour and can be influenced by the organ player, with the sampling technique only a certain situation can be reproduced. The aim of the diploma thesis is to find an algorithm which uses signal processing techniques to decompose the original sample of an organ pipe into the partial tones and the noise with repsect to the transient character of the chiff. Therefore several techniques have to be researched. With the results of the signal decomposition a new technique should be developed which makes it possible to reproduced the sound of an organ pipe and the chiff with respect to a mathematical description, physical properties and a realistic interaction with the organ player. |