Rotational Doppler analysis and demultiplexing of acoustic vortices using a microphone array

LIU Lianyun; CHU Zhigang

doi:10.12395/0371-0025.2023065

Volume 50 Issue 2

Mar. 2025

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ACTA ACUSTICA > 2025 > 50(2): 332-337. > DOI: 10.12395/0371-0025.2023065 CSTR: 32049.14.11-2065.2023065

LIU Lianyun, CHU Zhigang. Rotational Doppler analysis and demultiplexing of acoustic vortices using a microphone array[J]. ACTA ACUSTICA, 2025, 50(2): 332-337. DOI: 10.12395/0371-0025.2023065

Citation:

LIU Lianyun, CHU Zhigang. Rotational Doppler analysis and demultiplexing of acoustic vortices using a microphone array[J]. ACTA ACUSTICA, 2025, 50(2): 332-337. DOI: 10.12395/0371-0025.2023065

Citation:

LIU Lianyun, CHU Zhigang. Rotational Doppler analysis and demultiplexing of acoustic vortices using a microphone array[J]. ACTA ACUSTICA, 2025, 50(2): 332-337. DOI: 10.12395/0371-0025.2023065

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Rotational Doppler analysis and demultiplexing of acoustic vortices using a microphone array

LIU Lianyun,
CHU Zhigang^,

College of Mechanical and Vehicle Engineering, Chongqing University　Chongqing　400044

More Information

PACS:
- 43.58 (Acoustical measurements and instrumentation)
- 43.60 (Acoustic signal processing)
Received Date: May 05, 2023
Revised Date: June 13, 2023
Available Online: February 19, 2024

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Abstract

Abstract

In order to solve the problems of both insufficient response at low frequencies and crosstalk suffered by the existing acoustic vortex demultiplexing method using a single rotating microphone, a method using a circular array of microphones is proposed to analyze the rotational Doppler effect and then demultiplex the acoustic vortex. The circular microphone array is used to extract the time-domain sound pressure signals received by a rotating observer, and the rotational Doppler shifts of the extracted signals are obtained. The acoustic vortex is then demultiplexed from the single spectrum at a certain speed and the multiple spectra within a certain speed range, respectively. The results show that the demultiplexing method using the single-spectrum suffers from the failures caused by the extreme Doppler effect and the equal Doppler shift, while the demultiplexing method using the multiple spectra has effectively solved the problems of insufficient response at low frequencies and crosstalk.
- Acoustic vortex,
- Rotational Doppler effect,
- Microphone array,
- Demultiplexing

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References

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