A frequency-invariant fixed beamformer for speech enhancement

Rohith Mars; V. G. Reju; Andy W.H. Khong

doi:10.1109/APSIPA.2014.7041712

A frequency-invariant fixed beamformer for speech enhancement

Rohith Mars, V. G. Reju, Andy W.H. Khong

Nanyang Technological University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

4 Citations (Scopus)

Abstract

Fixed beamformers maintain response that is independent of the signal and interference statistics. Frequency-invariant fixed beamformers can achieve constant beamwidth across all frequencies which results in lower signal distortion and they have lower computation complexity compared to its adaptive counterpart. However, unlike data-dependent beamformers, their sidelobe attenuation is poor with respect to the direction of the interferences. In this paper we propose a method to improve the sidelobe attenuation while retaining the advantages of lower computational complexity and frequency-invariance. This is achieved by introducing frequency-invariant nulls in the interference directions. We also show how the weights for each null direction can be combined with the fixed beamformer to form the effective weights of the proposed beamformer.

Original language	English
Title of host publication	2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9786163618238
DOIs	https://doi.org/10.1109/APSIPA.2014.7041712
Publication status	Published - Feb 12 2014
Externally published	Yes
Event	2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014 - Chiang Mai, Thailand Duration: Dec 9 2014 → Dec 12 2014

Publication series

Name	2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014

Conference

Conference	2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014
Country/Territory	Thailand
City	Chiang Mai
Period	12/9/14 → 12/12/14

Bibliographical note

Publisher Copyright:
© 2014 Asia-Pacific Signal and Information Processing Ass.

ASJC Scopus Subject Areas

Signal Processing
Information Systems

Access to Document

10.1109/APSIPA.2014.7041712

Cite this

Mars, R., Reju, V. G., & Khong, A. W. H. (2014). A frequency-invariant fixed beamformer for speech enhancement. In 2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014 Article 7041712 (2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APSIPA.2014.7041712

Mars, Rohith ; Reju, V. G. ; Khong, Andy W.H. / A frequency-invariant fixed beamformer for speech enhancement. 2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014. Institute of Electrical and Electronics Engineers Inc., 2014. (2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014).

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abstract = "Fixed beamformers maintain response that is independent of the signal and interference statistics. Frequency-invariant fixed beamformers can achieve constant beamwidth across all frequencies which results in lower signal distortion and they have lower computation complexity compared to its adaptive counterpart. However, unlike data-dependent beamformers, their sidelobe attenuation is poor with respect to the direction of the interferences. In this paper we propose a method to improve the sidelobe attenuation while retaining the advantages of lower computational complexity and frequency-invariance. This is achieved by introducing frequency-invariant nulls in the interference directions. We also show how the weights for each null direction can be combined with the fixed beamformer to form the effective weights of the proposed beamformer.",

author = "Rohith Mars and Reju, {V. G.} and Khong, {Andy W.H.}",

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Mars, R, Reju, VG & Khong, AWH 2014, A frequency-invariant fixed beamformer for speech enhancement. in 2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014., 7041712, 2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014, Institute of Electrical and Electronics Engineers Inc., 2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014, Chiang Mai, Thailand, 12/9/14. https://doi.org/10.1109/APSIPA.2014.7041712

A frequency-invariant fixed beamformer for speech enhancement. / Mars, Rohith; Reju, V. G.; Khong, Andy W.H.
2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014. Institute of Electrical and Electronics Engineers Inc., 2014. 7041712 (2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AU - Reju, V. G.

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N2 - Fixed beamformers maintain response that is independent of the signal and interference statistics. Frequency-invariant fixed beamformers can achieve constant beamwidth across all frequencies which results in lower signal distortion and they have lower computation complexity compared to its adaptive counterpart. However, unlike data-dependent beamformers, their sidelobe attenuation is poor with respect to the direction of the interferences. In this paper we propose a method to improve the sidelobe attenuation while retaining the advantages of lower computational complexity and frequency-invariance. This is achieved by introducing frequency-invariant nulls in the interference directions. We also show how the weights for each null direction can be combined with the fixed beamformer to form the effective weights of the proposed beamformer.

AB - Fixed beamformers maintain response that is independent of the signal and interference statistics. Frequency-invariant fixed beamformers can achieve constant beamwidth across all frequencies which results in lower signal distortion and they have lower computation complexity compared to its adaptive counterpart. However, unlike data-dependent beamformers, their sidelobe attenuation is poor with respect to the direction of the interferences. In this paper we propose a method to improve the sidelobe attenuation while retaining the advantages of lower computational complexity and frequency-invariance. This is achieved by introducing frequency-invariant nulls in the interference directions. We also show how the weights for each null direction can be combined with the fixed beamformer to form the effective weights of the proposed beamformer.

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M3 - Conference contribution

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Mars R, Reju VG, Khong AWH. A frequency-invariant fixed beamformer for speech enhancement. In 2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014. Institute of Electrical and Electronics Engineers Inc. 2014. 7041712. (2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014). doi: 10.1109/APSIPA.2014.7041712

A frequency-invariant fixed beamformer for speech enhancement

Abstract

Publication series

Conference

Bibliographical note

ASJC Scopus Subject Areas

Access to Document

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