• Journal of Broadcast Engineering
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• v.21 no.6
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• pp.889-898
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• 2016

Virtual Bass System (VBS) is widely used to extend the lower frequency limit of small loudspeakers, which generates harmonics of a fundamental frequency. The perceptual quality of the VBS is highly dependent on the harmonic weighting strategy. There have been several weighting methods, including exponential attenuation and timbre matching. However, it is essential to match phases between harmonics in the original signal and generate harmonics to precisely convey the weighting strategy. This paper shows the limitations of the previous harmonic weighting schemes and proposes a new harmonic weighting scheme. The proposed weighting scheme proposes phase matching between the original and generated harmonics and varies the slope of the attenuation weighting dynamically according to the missing fundamental frequency. Objective and subjective tests show that the proposed harmonic weighting scheme provides more natural and effective bass perception in a limited situation than the conventional schemes, which implies that the phase matching is essential for the high quality bass enhancement.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.842-843
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• 2007

In this paper, the proper rebate level can be decided in programs of energy savings by solving an optimization problem with an objective function, which satisfies a maximum value of total energy savings. And then, each prevalence amount is estimated by using virtual Bass model which is a function of rebate level, instead of the conventional Bass model. Finally, by cost/benefit analysis of the estimated prevalence amounts, the priority order is obtained for the investment of each program. The priority order obtained in this way may result the improvement of investment efficiency for DSM(Demand-Side Management) programs and the reasonable plan decision for supply and demand in power system.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.82-85
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• 2016

본 논문은 스피커의 저역 재생 대역을 확장하기 위한 가상 저음 시스템의 성능을 향상시키기 위한 방법을 제안하였다. 제안 방법은 생성하는 신호의 위상을 기존 신호의 위상과 맞추어 강화 과정에서 발생하는 상쇄 간섭의 가능성을 제거한다. 또한 생성한 배음의 상대적 크기를 기본 주파수에 맞추어 가변적으로 적용하여 저역감을 효과적으로 강화하면서 음색의 열화를 줄이는 방법을 제시한다. 제안한 알고리즘은 기존 가상 저음 시스템보다 더 높은 성능을 가지는 것을 확인하였으며, 스피커 환경에서 저역 재생 성능의 향상을 확인하였다.