Constant beamwidth beamformer for difference frequency in parametric array

Khim S. Tan; Woon S. Gan; Jun Yang; Meng H. Er

Constant beamwidth beamformer for difference frequency in parametric array

Khim S. Tan^*, Woon S. Gan, Jun Yang, Meng H. Er

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Conference article › peer-review

10 Citations (Scopus)

Abstract

The sound reproduction in air by using a parametric acoustic array has been reported for a few decades. Two inaudible ultrasonic frequencies are produced from the parametric array. Due to the nonlinearity of air, it is possible to produce an audible frequency with its frequency equal to the difference in the two ultrasonic frequencies. However, there is not much work done in controlling the beam pattern of the difference frequency generated by the primary waves. In this paper, an algorithm is proposed to control the sidelobe level of the difference frequency directivity. By making use of array signal processing techniques, the algorithm is also capable of producing a constant beamwidth for broadband difference frequency.

Original language	English
Pages (from-to)	361-364
Number of pages	4
Journal	Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing
Volume	5
Publication status	Published - 2003
Externally published	Yes
Event	2003 IEEE International Conference on Accoustics, Speech, and Signal Processing - Hong Kong, Hong Kong Duration: Apr 6 2003 → Apr 10 2003

ASJC Scopus Subject Areas

Software
Signal Processing
Electrical and Electronic Engineering

Cite this

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title = "Constant beamwidth beamformer for difference frequency in parametric array",

abstract = "The sound reproduction in air by using a parametric acoustic array has been reported for a few decades. Two inaudible ultrasonic frequencies are produced from the parametric array. Due to the nonlinearity of air, it is possible to produce an audible frequency with its frequency equal to the difference in the two ultrasonic frequencies. However, there is not much work done in controlling the beam pattern of the difference frequency generated by the primary waves. In this paper, an algorithm is proposed to control the sidelobe level of the difference frequency directivity. By making use of array signal processing techniques, the algorithm is also capable of producing a constant beamwidth for broadband difference frequency.",

author = "Tan, {Khim S.} and Gan, {Woon S.} and Jun Yang and Er, {Meng H.}",

year = "2003",

language = "English",

volume = "5",

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journal = "Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing",

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publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "2003 IEEE International Conference on Accoustics, Speech, and Signal Processing ; Conference date: 06-04-2003 Through 10-04-2003",

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TY - JOUR

T1 - Constant beamwidth beamformer for difference frequency in parametric array

AU - Tan, Khim S.

AU - Gan, Woon S.

AU - Yang, Jun

AU - Er, Meng H.

PY - 2003

Y1 - 2003

N2 - The sound reproduction in air by using a parametric acoustic array has been reported for a few decades. Two inaudible ultrasonic frequencies are produced from the parametric array. Due to the nonlinearity of air, it is possible to produce an audible frequency with its frequency equal to the difference in the two ultrasonic frequencies. However, there is not much work done in controlling the beam pattern of the difference frequency generated by the primary waves. In this paper, an algorithm is proposed to control the sidelobe level of the difference frequency directivity. By making use of array signal processing techniques, the algorithm is also capable of producing a constant beamwidth for broadband difference frequency.

AB - The sound reproduction in air by using a parametric acoustic array has been reported for a few decades. Two inaudible ultrasonic frequencies are produced from the parametric array. Due to the nonlinearity of air, it is possible to produce an audible frequency with its frequency equal to the difference in the two ultrasonic frequencies. However, there is not much work done in controlling the beam pattern of the difference frequency generated by the primary waves. In this paper, an algorithm is proposed to control the sidelobe level of the difference frequency directivity. By making use of array signal processing techniques, the algorithm is also capable of producing a constant beamwidth for broadband difference frequency.

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M3 - Conference article

AN - SCOPUS:0141855324

SN - 1520-6149

VL - 5

SP - 361

EP - 364

JO - Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing

JF - Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing

T2 - 2003 IEEE International Conference on Accoustics, Speech, and Signal Processing

Y2 - 6 April 2003 through 10 April 2003

ER -

Constant beamwidth beamformer for difference frequency in parametric array

Abstract

ASJC Scopus Subject Areas

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