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Robust hypercardioid synthesis for spatial audio capture: microphone geometry, directivity and robustness

Blanco Galindo, Miguel, Coleman, Philip and Jackson, Philip (2019) Robust hypercardioid synthesis for spatial audio capture: microphone geometry, directivity and robustness In: 2019 AES International Conference on Immersive and Interactive Audio, 2019-03-27-2019-03-29, York, UK.

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Frequency-invariant beamformers are useful for spatial audio capture since their attenuation of sources outside the look direction is consistent across frequency. In particular, the least-squares beamformer (LSB) approximates arbitrary frequency-invariant beampatterns with generic microphone configurations. This paper investigates the effects of array geometry, directivity order and regularization for robust hypercardioid synthesis up to 15th order with the LSB, using three 2D 32-microphone array designs (rectangular grid, open circular, and circular with cylindrical baffle). While the directivity increases with order, the frequency range is inversely proportional to the order and is widest for the cylindrical array. Regularization results in broadening of the mainlobe and reduced on-axis response at low frequencies. The PEASS toolkit was used to evaluate perceptually beamformed speech signals.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Vision Speech and Signal Processing
Authors :
Blanco Galindo,
Date : 17 March 2019
Copyright Disclaimer : Copyright 2019 AES This paper was presented at the 2019 Conference of the Audio Engineering Society on Immersive and Interactive Audio, as paper number 49. The full published version can be found at
Related URLs :
Depositing User : Diane Maxfield
Date Deposited : 15 Apr 2019 14:25
Last Modified : 30 Sep 2019 02:08

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