Monday, May 22, 15:30 — 17:30
Elena Shabalina (Chair)
P21-01 Far-Field Noise Prediction for Open-Air Events. Part 1: Background and Propagation Models
Elena Shabalina (Presenting Author), Daniel Belcher (Author), Matthias Christner (Author), Jochen Schaal (Author), Dieter Zollitsch (Author)
In the past the main focus of loudspeaker manufacturers and sound system designers was to provide the best possible sound quality for the listeners. With the number of these events increasing along with the number of the affected inhabitants and their complaints, the focus is shifting towards including predicting and minimizing the noise in the neighborhood in the planning of an open air event. The presented calculation method is designed to close the gap between the environmental noise propagation models and complex loudspeaker system models. The implementation of the Nord2000 and ISO 9613-2 propagation models were extended to include complex loudspeaker setups. This paper presents the motivation and the theoretical background of the new prediction method.
Convention Paper 9790
P21-02 Noise Prediction Software for Open-Air Events Part 2: Experiences and Validation
Daniel Belcher (Presenting Author), Matthias Christner (Author), Elena Shabalina (Author)
The prediction and minimization of noise in the neighborhood during the planning phase of open-air events is becoming more important. The common available software for calculating environmental noise did not consider complex summation of sound because typical noise sources in traffic or industry are not coherent. State of the art sound systems with arrays of loudspeakers and subwoofers effectively use coherence in order to achieve their high directivity. The propagation models were not only extended for complex summation, but also for import of complex data from a system design tool (see Part 1 for details). This paper presents experiences with the simulation software NoizCalc in the field since its launch, its validation by means of a comparison with accompanying measurements and a derivation of uncertainty, in order to set the informative value of a prediction into context.
Convention Paper 9791
P21-03 Development and Evaluation of an Interface with Four-Finger Pitch Selection
Henrik von Coler (Presenting Author), Hauke Egermann (Author), Gabriel Treindl (Author), Stefan Weinzierl (Author)
This paper presents the development and evaluation of an interface for electronic musical instruments, designed for controlling monophonic synthesizers. The hand-held device allows the pitch selection with one hand, using four valve-like metal mechanics and three octave switches. Note events are triggered with a wooden excitation pad, operated with the second hand. The sensors are equipped with an advanced aftertouch, which enables expressive playing. In a user experiment, the controller is compared to a MIDI keyboard, regarding the reaction time and error rate in simple tasks. Results show no significant difference in the response time but a higher error rate for the novel interface. Outcome of this work is a list of necessary improvements and a plan for further experiments.
Convention Paper 9792
P21-04 Interactive Display of Microphone Polarity Patterns with Non-Fixed Frequency Point
Jonathan D. Ziegler (Presenting Author), Hendrik Paukert (Author), Bernfried Runow (Author)
With the development of bidirectional and unidirectional microphones dating back to the 1930s, the parameter of directivity has been an integral aspect of microphone construction for nearly 100 years . This characteristic is commonly visualized with the microphone’s sensitivity displayed as a radius r over a 360-degree span within a polar coordinate system. Measured directivity is generally shown as an overlay of well-defined frequencies . Although this is common practice, in-depth analysis of the actual performance of a microphone is difficult. In this paper, a novel approach to displaying the directional characteristics of a microphone is presented, providing an interactive display of the angular sensitivity at any frequency. Furthermore, the application within microphone array development is discussed.
Convention Paper 9793