Development of an adjustable pipe-foot model of a labial organ pipe

In order to investigate the physical processes involved in the build-up of the sound signal in a labial organ pipe a pipe foot model has been developed. The main important parameters, such as positions of the lower and upper labium, the wind pressure in the foot and the width of the flue can be adjusted by means of this model. Moreover, different types of languid and pipe bodies (resonators) can be attached to the model. For the reason of corresponding to a real metal organ pipe these parts of the model are made of "organ metal". The reproducibility of measurements is provided by the micrometer screws applied for the adjustments. Flow and edge tone measurements were carried out with the help of this model. A comparison with real organ pipes gives some indications for the range of the parameters. Because of the flexible adjustments and the large range of values of every parameter, it is possible to find different ranges with varying parameter settings for the occurrence of the edge tone. The analysis of these measurement results shows the dependency of the edge tone of the adjusted parameters.