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Appl. Sci. 2016, 6(2), 39; doi:10.3390/app6020039

Frequency-Dependent Amplitude Panning for the Stereophonic Image Enhancement of Audio Recorded Using Two Closely Spaced Microphones

School of Information and Communications, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea
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Academic Editor: Vesa Valimaki
Received: 19 November 2015 / Revised: 19 January 2016 / Accepted: 21 January 2016 / Published: 1 February 2016
(This article belongs to the Special Issue Audio Signal Processing)
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Abstract

In this paper, we propose a new frequency-dependent amplitude panning method for stereophonic image enhancement applied to a sound source recorded using two closely spaced omni-directional microphones. The ability to detect the direction of such a sound source is limited due to weak spatial information, such as the inter-channel time difference (ICTD) and inter-channel level difference (ICLD). Moreover, when sound sources are recorded in a convolutive or a real room environment, the detection of sources is affected by reverberation effects. Thus, the proposed method first tries to estimate the source direction depending on the frequency using azimuth-frequency analysis. Then, a frequency-dependent amplitude panning technique is proposed to enhance the stereophonic image by modifying the stereophonic law of sines. To demonstrate the effectiveness of the proposed method, we compare its performance with that of a conventional method based on the beamforming technique in terms of directivity pattern, perceived direction, and quality degradation under three different recording conditions (anechoic, convolutive, and real reverberant). The comparison shows that the proposed method gives us better stereophonic images in a stereo loudspeaker reproduction than the conventional method without any annoying effects. View Full-Text
Keywords: stereophonic image for stereo loudspeakers; frequency-dependent amplitude panning; azimuth-frequency analysis; two closely spaced omni-directional microphones stereophonic image for stereo loudspeakers; frequency-dependent amplitude panning; azimuth-frequency analysis; two closely spaced omni-directional microphones
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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

Chun, C.J.; Kim, H.K. Frequency-Dependent Amplitude Panning for the Stereophonic Image Enhancement of Audio Recorded Using Two Closely Spaced Microphones. Appl. Sci. 2016, 6, 39.

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