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Appl. Sci. 2017, 7(6), 541; doi:10.3390/app7060541

Stereophonic Microphone Array for the Recording of the Direct Sound Field in a Reverberant Environment

Acoustics Group, Cluster of Excellence “Hearing4All”, Carl von Ossietzky University, 26111 Oldenburg, Germany
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Academic Editors: Woon-Seng Gan and Jung-Woo Choi
Received: 15 March 2017 / Revised: 15 May 2017 / Accepted: 17 May 2017 / Published: 24 May 2017
(This article belongs to the Special Issue Spatial Audio)
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Abstract

State-of-the-art stereo recording techniques using two microphones have two main disadvantages: first, a limited reduction of the reverberation in the direct sound component, and second, compression or expansion of the angular position of sound sources. To address these disadvantages, the aim of this study is the development of a true stereo recording microphone array that aims to record the direct and reverberant sound field separately. This array can be used within the recording and playback configuration developed in Grosse and van de Par, 2015. Instead of using only two microphones, the proposed method combines two logarithmically-spaced microphone arrays, whose directivity patterns are optimized with a superdirective beamforming algorithm. The optimization allows us to have a better control of the overall beam pattern and of interchannel level differences. A comparison between the newly-proposed system and existing microphone techniques shows a lower percentage of the recorded reverberance within the sound field. View Full-Text
Keywords: intensity-based stereo-recording; convex optimization; superdirective beamformer; white noise gain; logarithmic array design; spatial audio intensity-based stereo-recording; convex optimization; superdirective beamformer; white noise gain; logarithmic array design; spatial audio
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gößwein, J.A.; Grosse, J.; van de Par, S. Stereophonic Microphone Array for the Recording of the Direct Sound Field in a Reverberant Environment. Appl. Sci. 2017, 7, 541.

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