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The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
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Boundary absorption approximation in the spatial high-frequency extrapolation method for parametric room impulse

Alex Southern1, Damian T Murphy1, Lauri Savioja2

  • 1AudioLab: Department of Electronic Engineering, University of York, York, YO10 5DD, United Kingdom.

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|May 4, 2019
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Summary
This summary is machine-generated.

This study introduces a spatial high-frequency extrapolation method to extend low-frequency room impulse responses to higher frequencies. This technique enhances acoustic simulations and auralizations for a wider range of audio applications.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Computational Physics

Background:

  • Finite-difference time domain (FDTD) simulations are limited to low frequencies.
  • Extending simulations to the full audio band requires high-frequency extrapolation of spatial room impulse responses (SRIRs).

Purpose of the Study:

  • To develop and validate a spatial high-frequency extrapolation method for SRIRs.
  • To enable the extension of low-frequency FDTD simulations to the full audio band.

Main Methods:

  • A frame-by-frame time/frequency analysis to identify directional reflected components in SRIRs.
  • A proposed boundary absorption weighting function based on parametric approximation of SRIR energy decay relief.
  • Application to both measured and FDTD-simulated impulse responses.

Main Results:

  • Successful extrapolation of low-frequency SRIRs to higher frequencies across various acoustic spaces.
  • Objective measures indicate close approximation of reverberation time and acceptable early decay time values.
  • Auralizations confirm the plausibility of the extrapolation method.

Conclusions:

  • The spatial high-frequency extrapolation method effectively extends band-limited SRIRs to the full audio band.
  • This approach enhances the fidelity of acoustic simulations and auralizations.
  • The method shows promise for improving the realism of virtual acoustic environments.