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Related Concept Videos

Echo01:06

Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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Aliasing01:18

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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Time-domain sound field reconstruction using a rigid spherical microphone array.

Peihong Jiang1, Zhigang Chu1, Yang Zhao1

  • 1College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, People's Republic of China.

The Journal of the Acoustical Society of America
|April 24, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel time-domain method for acoustic holography, enabling low-delay sound field reconstruction. The approach enhances accuracy and real-time capabilities for non-stationary sound fields.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Computational Physics

Background:

  • Traditional frequency-domain acoustic holography faces limitations with non-stationary sound fields and time-frequency transformation issues.
  • Accurate reconstruction of sound fields is crucial for source identification and acoustic analysis.

Purpose of the Study:

  • To develop a time-domain approach for interior spherical near-field acoustic holography.
  • To achieve low-delay reconstruction of time-domain sound fields, including incident and scattered components.
  • To enable real-time acoustic analysis of non-stationary sound fields.

Main Methods:

  • Utilized a rigid spherical microphone array for measurements.
  • Derived time-domain radial propagators via inverse Fourier transform of frequency-domain counterparts.
  • Implemented propagators as finite impulse response (FIR) filters for sample-by-sample processing.

Main Results:

  • Successfully reconstructed incident pressure, incident radial particle velocity, and total pressure fields.
  • Demonstrated higher accuracy and lower latency compared to frequency-domain methods.
  • Avoided spherical Bessel function nulls and the need for particle velocity measurements.

Conclusions:

  • The proposed time-domain method offers significant advantages for real-time acoustic holography.
  • The FIR filter implementation ensures efficient and accurate reconstruction of dynamic sound fields.
  • This cost-effective approach enhances the potential for practical applications in acoustics.