• The Journal of the Acoustical Society of Korea
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• v.32 no.6
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• pp.541-547
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• 2013

The speech quality of multi-party audio telephony between two, three or more participants is decreased by audio volume imbalance, audio volume saturation and noise level increase. To solve this issue, this paper proposes an advanced audio mixing algorithm for software-based multi-point control unit. Our approach is based on the combined voice activity detection and gain control technique that consists of a set of algorithms that classify audio signals, estimate audio volumes, adjust gain factors and mix audio signals of all channels. The proposed audio mixing algorithm is computationally efficient, delivers high-quality speech, and is suitable for use in any practical multi-party audio telephony.

• Journal of Korea Society of Industrial Information Systems
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• v.24 no.5
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• pp.105-113
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• 2019

Korean military uses 'Tactical information communication network' to exchange information between units. In this study, we developed a media processing board for multi-party voice and video telephony based on open source software. On the other hand, in order to apply open source software for weapon systems and parts that are mounted on weapon systems, appropriate review is required according to the weapon system software development and management manual of the Defense Acquisition Program Administration (DAPA). In this study, the analysis of the requirement items was performed and the appropriate countermeasures were proposed for the open software applied to the media processing board with respect to 'the guidelines for the application of weapon systems to open source software', an appendix to the DAPA's manual.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.349-350
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• 2012

본 논문에서는 다자간 영상통화의 오디오 게인콘트롤을 위한 저연산 음성분류방식을 제안한다. 제안된 음성분류방식은 입력되는 음성신호를 음성신호의 특징에 따라서 묵음/무성음/유성음으로 분류한다. 입력된 음성신호의 에너지를 이용해서 음성구간과 비음성구간을 판별한다. 음성구간으로 판별된 구간에 대해서 ZCR(Zeor Crossing Rate)를 이용하여 유성음과 무성음으로 분류한다. 제안된 방식의 성능을 측정을 위해 음성분류 정확도와 연산시간을 측정하여 성능을 측정하였다.