Overhead clouds and canopies are used in auditoriums to blend the direct and reflected sound and either increase intelligibility or enhance musical clarity and intimacy. Typically canopy arrays are used instead of a solid ceiling, to provide needed early reflections, while maintaining a desired reverberation time. Often, flat panel arrays are used for economy. However, flat panel arrays can potentially provide non-uniform scattered sound, due to the lack of scattering from gaps between the panels. One approach to help reduce this problem is to utilize shaping to provide diffusion. The simplest approach is a single curvature panel called the Monoradial™. The Monoradial™ is typically used to provide longitudinal (front-back) scattering to help minimize the problems from flat panels. The Monoradial™ is manufactured in either a Class A wood veneered MDF core or in a molded glass reinforced gypsum. Problem Solution
Diffusion
In the left illustration, we show an array of flat panels 1m wide and 1.25 m apart, along with the source and the receiver arc. In the middle illustration, we show the far field response along the receiver arc for this flat panel array. Periodicity lobing at +/- 53 degrees at mid frequencies (dark line) is evident. High frequencies (light line) are purely specular and low frequencies (dashed line) are omnidirectional for this panel size. On the right, the response for an array of semicylinders of the same size is shown at mid frequency (light line), illustrating the dispersing effect of the semicylinders. Periodicity lobing, however, is still present. The response of an aperiodic semicylinder array is also shown (dark line) to illustrate the improvement modulation provides.
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| Installation Installation is simple for both the wood and gypsum type Monoradial. For the wood unit, a metal thimble is provided to capture a wire cable through the holes provided in the ribs at the rear of the panel. For the gypsum unit (see photo at right), a metal suspension pin is embedded at regular intervals at the rear of the panel. Simply attach suitable wire cable for dead hung installations. |
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Waveform™ Monoradial:
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Curvature Acoustical Clouds & Canopies in a Wood Veneer, Laminate or Painted Finish From The Industry’s Leading
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2000, RPG Diffusor Systems, Inc. |