Review of Acoustic Sources Alternatives to a Dodecahedron Speaker

@article{Papadakis2019ReviewOA,
  title={Review of Acoustic Sources Alternatives to a Dodecahedron Speaker},
  author={Nikolaos M. Papadakis and Georgios E. Stavroulakis},
  journal={Applied Sciences},
  year={2019}
}
An omnidirectional source is required in many acoustic measurements. Commonly a dodecahedron speaker is used but due to various factors (e.g., high cost, transportation difficulties) other acoustic sources are sometimes preferred. In this review, fifteen acoustic source alternatives to a dodecahedron speaker are presented while emphasis is placed on features such as omnidirectionality, repeatability, adequate sound pressure levels, even frequency response, accuracy in measurement of acoustic… 

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References

SHOWING 1-10 OF 184 REFERENCES

Impulse source versus dodecahedral loudspeaker for measuring parameters derived from the impulse response in room acoustics.

It is found that using impulse sources leads to greater variation in the results, especially at low frequencies, and a new descriptor for dodecahedral sources reflecting the influence their lack of omnidirectionality produces on measuring acoustic parameters is proposed.

Low Cost Omnidirectional Sound Source Utilizing a Common Directional Loudspeaker for Impulse Response Measurements

Alternative low-cost sources (e.g., balloons, gun fires) are used for impulse response measurements when a dodecahedron speaker is not available. This study sets to explore the applicability of a

Optimizing stepwise rotation of dodecahedron sound source to improve the accuracy of room acoustic measures.

  • F. Martellotta
  • Physics
    The Journal of the Acoustical Society of America
  • 2013
Results show that averages of three measurements carried out at 30° angular steps are closer to actual values and show much less fluctuation, and an averaging of the directional intensity components of the selected responses stabilizes the spatial distribution of the reflections.

The Source Directivity of a Dodecahedron Sound Source determined by Stepwise Rotation

An omnidirectional sound source is commonly used in room acoustical measurements. The omnidirectional directivity is usually approached by placing 12 loudspeakers in a regular 12-face polyhedron,

Realization of an omnidirectional source of sound using parametric loudspeakers.

The omnidirectional parametric loudspeaker (OPL), consisting of a sphere with hundreds of ultrasonic transducers placed on it, has been constructed and has performed better than the conventional loudspeaker especially for frequencies higher than 500 Hz, its main drawback being the difficulty to generate intense pressure levels at low frequencies.

Construction of an Omnidirectional Parametric Loudspeaker Consisting in a Spherical Distribution of Ultrasound Transducers

Measurements show that the OPL has a good omnidirectional behavior for most frequencies, and clearly improves the directivity of dodechaedral sources in the high frequency range, but performs worse at low frequencies.

Evaluation of a three-way omnidirectional sound source for room impulse response measurements

Commercially available omnidirectional loudspeakers, which are used to measure room impulse responses, typically have a limited bandwidth and are only omnidirectional below approximately 1kHz. To
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