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Optimized Implementation of Interpolation Filters for HEVC Encoder
Taejin Hwang,안용조,유지우,심동규 대한전자공학회 2013 전자공학회논문지 Vol.50 No.11
In this paper, a fast algorithm of discrete cosine transform-based interpolation filter (DCT-IF) for HEVC (high efficiency video coding) encoder is proposed. DCT-IF filter accounts for around 30% of encoder complexity, according to the computational complexity analysis with the HEVC reference software. In this work, the proposed DCT-IF is optimized by applying frame-level interpolation, SIMD optimization, and task-level parallelization via OpenMP on a developed C-based HEVC encoder. Performance analysis is conducted by measuring speed-up factor of the proposed optimization technique on the developed encoder. The results show that speed-up factors by frame-level interpolation, SIMD, and OpenMP are approximately 38-46, 3.6-4.4, and 3.0-3.7, respectively. In the end, we achieved the speed-up factor of 498.4 with the proposed fast algorithm.
황태진(Taejin Hwang),황인선(Inseon Hwang),김준우(Junwoo Kim),최은수(Eunsoo Choi) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper shows vehicle level experimental results of some enablers to reduce fuel pump noise in passenger car. The enablers for noise reduction are considered by reducing of noise source and isolating of structure path. In this paper, the test results show wide frequency area at vehicle interior noise. The test results in this paper can introduce some enablers and present the effectiveness of each enabler.
황태진(Taejin Hwang),이충휘(Choonghwi Lee),김종만(Jongman Kim),신한승(Hanseung Shin) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
This paper addresses noise issues within the vehicles HVAC (Heating, Ventilating, and Air-Conditioning) system. HVAC systems significantly impact the vehicles interior environment, and this paper deals with problems related to compressor booming/growling noise, PWM control frequency noise, and hissing noise during initial air conditioning operation. It provides experimental methods for reducing these noises, contributing to the improvement of the vehicles interior environment.