Impulse response reverb as a tool for voicing organs.

Abstract

The sound of a flue pipe can be adjusted by voicing. With parameters like the cut-up of the upper lip and their width, the opening in the foot, the height of the languid, and the width of the slit the voicer can influence the promptness of speech and adjust the intensity of the starting transient. The acoustical environment (especially the reverberation time) plays an important role in the reception of the starting transient, therefore the organ builder has to also take the architecture into account. Convolution reverb allows a simulation of the reverb at different positions. Sampled organ sounds with modified starting transients or modeled sounds can be played on a computer and mixed with a convolution reverb using measured impulse responses from different positions of the room. This computer model can be used during the design process to estimate the parameters for the voicing. Results of measurements in a church building and different modeling techniques will be presented