The pipe organ stands as a bastion in concert halls and church sanctuaries, and even when not in use, it affects the acoustical environment around it. Researchers performed a sine-sweep through loudspeakers facing the organ pipes and measured the response with a microphone at different positions.
They verified experimentally that sympathetic resonance does occur in organ pipes during musical performances and speeches, and that the overall amplitude increases when the signal matches the resonance of one or more pipes.
"The question is how much the pipe organ contributes to an acoustic environment -- and the bigger question is, what portion of music is the acoustic environment, and vice versa?" Snow said. A sine-sweep -- a resonance test in which a sine-wave shaped signal is used to excite a system -- was played through loudspeakers facing the organ pipes and measuring the response with a microphone at different positions. Data was gathered by placing microphones inside and around the organ pipes during a musical performance and a church service.
Investigation into the significance of these effects on the overall quality of musical performance to listeners in the audience is still ongoing. Snow hopes to expand this research by comparing room acoustics between rooms with and without the presence of an organ, along with categorizing and mathematically modeling the tuning system of various world instruments.
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