Close miking represents a widely employed practice of placing a microphone very near to the sound source in order to capture more direct sound and minimize any pickup of ambient sound, including other, concurrently active sources. It is used by the audio engineering community for decades for audio recording, based on a number of empirical rules that were evolved during the recording practice itself. But can this empirical knowledge and close miking practice be systematically verified? In this work we aim to address this question based on an analytic methodology that employs techniques and metrics originating from the sound source separation evaluation field. In particular, we apply a quantitative analysis of the source separation capabilities of the close miking technique. The analysis is applied on a recording dataset obtained at multiple positions of a typical musical hall, multiple distances between the microphone and the sound source multiple microphone types and multiple level differences between the sound source and the ambient acoustic component. For all the above cases we calculate the Source to Interference Ratio (SIR) metric. The results obtained clearly demonstrate an optimum close-miking performance that matches the current empirical knowledge of professional audio recording.
Drossos, Konstantinos; Mimilakis, Stylianos Ioannis; Floros, Andreas; Virtanen, Tuomas; Schuller, Gerald
Affiliations: Fraunhofer Institute for Digital Media Technology IDMT, Ilmenau, Germany; Tampere University of Technology, Tampere, Finland; Ionian University, Corfu, Greece; Technical University of Ilmenau, Ilmenau, Germany(See document for exact affiliation information.)
AES Convention: 142 (May 2017) Paper Number: 9760
Publication Date: May 11, 2017
Subject: Audio Analysis and Synthesis
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