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• W4281610756 abstract "Time reversal (TR) signal processing is an effective tool to exploit a reverberant environment for the intentional focusing of airborne, audible sound. A previous room acoustics TR study found preliminary evidence that above a certain focal amplitude the focal waveform begins to display signs of nonlinearity [Willardson, Anderson, Young, Denison, and Patchett, J. Acoust. Soc. Am. 143(2), 696-705 (2018)]. This study investigates that nonlinearity further by increasing the focal peak amplitudes beyond that previously observed. This increases the nonlinear characteristics, allowing for a closer inspection of their properties. An experiment is conducted using eight horn loudspeaker sources and a single receiver in a reverberation chamber. A maximum peak focal amplitude of 214.8 kPa (200.6 dBpk) is achieved. The focus signal waveforms are linearly scaled to observe and characterize the nonlinear amplification of the waveform. Frequency spectra of the peak focal amplitudes are plotted to observe changes in frequency content as the signals become nonlinear. A one-dimensional spatial scan of the focal region is conducted to observe properties of the converging and diverging waves. A proposal for a possible explanation involving free-space Mach stem formation is given." @default.
• W4281610756 created "2022-06-12" @default.
• W4281610756 creator A5038698451 @default.
• W4281610756 creator A5084754151 @default.
• W4281610756 date "2022-06-01" @default.
• W4281610756 modified "2023-09-30" @default.
• W4281610756 title "Nonlinear characteristics of high amplitude focusing using time reversal in a reverberation chamber" @default.
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• W4281610756 doi "https://doi.org/10.1121/10.0011517" @default.
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