Improved Directivity of Flat Panel Loudspeakers by Minimizing the Off-Axis Radiation below Coincidence
| Autor: | Robert Schurmann, Ercan Altinsoy, Benjamin Zenker, Sebastian Merchel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
QH301-705.5 Acoustics QC1-999 02 engineering and technology Radiation 01 natural sciences Directivity Flat panel Coincidence directivity response 0103 physical sciences General Materials Science directivity Biology (General) 010301 acoustics Instrumentation QD1-999 Fluid Flow and Transfer Processes Physics damping Process Chemistry and Technology General Engineering flat panel loudspeaker 021001 nanoscience & nanotechnology Engineering (General). Civil engineering (General) standing waves Computer Science Applications traveling waves Chemistry numerical simulation Loudspeaker TA1-2040 0210 nano-technology |
| Zdroj: | Applied Sciences, Vol 11, Iss 7001, p 7001 (2021) Applied Sciences Volume 11 Issue 15 |
| ISSN: | 2076-3417 |
| Popis: | Flat panel loudspeakers are a promising alternative to conventional loudspeakers. In particular, quasi-omnidirectional radiation at higher frequencies is stressed as an advantage of these systems compared to conventional speaker systems. However, this advantage can also be considered a disadvantage. Compared to that from conventional speakers with a flat and smooth on-axis and off-axis response, this wide radiation from flat panel loudspeakers occurs with an inconstant directivity factor, which can cause coloration and unusual spatial artifacts. This paper investigated the root causes of inhomogeneous directivity by using numerical methods. Based on these analyses, specific prototypes with various damping layups were built to overcome this problem. The additional damping layer reduces the off-axis radiation without significantly reducing the pressure level in the listening window. This approach is simple, robust, inexpensive and effective for improving the directivity of flat panel loudspeakers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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