그림 1. ITD 와 ILD Fig. 1 ITD and ILD
그림 2. 음원과 관찰자와의 각도에 따른 ITD 그래프. Fig. 2 ITD graph.
그림 3. 음원과 관찰자의 각도에 따른 ILD 그래프 Fig. 3 ILD Graph
그림 4. 수평면상에서 θV와 θA Fig. 4 θV and θA in azimuth plane
그림 5. θA도출 알고리즘 Fig. 5 θA generating algorithm
그림 6. 360° 영상의 영상 음향 정위 일치율 Fig. 6 360° Video Graph expressed with concordance rate of video and audio localization
그림 7. 360° 영상 입체음향 획득장치 Fig. 7 360° video and spatial audio recorder
그림 8. 시선에 따른 4방향 음원 믹싱 방법 Fig. 8 Mixing Method using 4 audio source by points of view
그림 9. ITD, ILD 측정 과정 Fig. 9 Process of measuring ITD, ILD
그림 10. θV = 90°인 상황에서 좌(위)·우(아래)로 들어온 신호 파형 Fig. 10 Waveform when θV = 90°. L(up), R(down)
그림 11. 개선된 360° 영상에서의 영상 음향 정위 일치율 그래프 Fig. 11 Graph of concordance rate of video and audio localization of the improved 360° video
표 1. 실험에 사용된 장비 Table 1. Equipments for experiment
표 2. ITD 측정 결과 (㎲) Table 2. Result of measuring ITD (㎲)
표 3. ILD 측정 결과 (dB)Table 3. Result of measuring ILD (dB)
References
- Y. Kim, H. Myung, H. Jung, and K. Kim, "3D Sound Technology," Communications of Korean Institute of Information Scientists and Engineers, vol. 19, no. 5, May 2001, pp. 30-37.
- C. Song, C. Yang, S. Park, J. Ku, and H. Park, "Audio Object Localization for 2D Stereo to 3D Virtual Audio Contents Converting," Proc. of Information and Control Symp., Chung-Ang University, Korea, Apr. 2014, pp. 164-165.
- T. Joe, S. Kim, G. Park, E. Go, J. Yang, and Y. Kim, "A study for change of audio data according to rotation degree of VR video," J. of Korea Institute of Electronic Communication Science, vol. 12, no. 6, Dec. 2017, pp. 1135-1142. https://doi.org/10.13067/JKIECS.2017.12.6.1135
- T. Francart, A. Lenssen, and J. Wouters, "Enhancement of interaural level differences improves sound localization in bimodal hearing," J. Acoust. Soc. Am., vol. 130, no. 5, Nov. 2011, pp. 2817-2826. https://doi.org/10.1121/1.3641414
- J. Kim, S. Kim, Y. Lee, S. Yeo, and H. Cho, "A Study of Immersive Audio Improvement of FTV using an effective noise," J. of the Korea Institute of Electronic Communication Sciences, vol. 10, no. 2, Feb. 2015, pp. 233-238. https://doi.org/10.13067/JKIECS.2015.10.2.233
- N. L. Aronson and W. M Hartmann, "Testing, correction, and extending the Woodworth model for interaural time difference," J. Acoust. Soc. Am., vol. 135, no. 2, Feb. 2014, pp. 817-823. https://doi.org/10.1121/1.4861243
- C. Han, B. Park, J. Seo, and H. Kim, "Direction of arrival Estimation using Frequency Domain Binaural Model," Proc. of KIIT Summer Conference, Kumoh National Institute of Technology, Korea, June 2007, pp. 233-237.
- S. Kim, Y. Lee, and Y. Lee, "3D Sound System Based on Audio/Video Analysis," In Proc. IEEK SUMMER Conf., Maison GLAD Jeju, Korea, July 2013, pp. 1924-1927.
- R. C. G. Smith and S. R. Price, "Modelling of Human Low Frequency Sound Localization Acuity Demonstrates Dominance of Spatial Variation of Interaural Time Difference and Suggests Uniform Just-Noticeable Differences in Interaural Time Difference," PLoS ONE, vol. 9, no. 2, Feb. 2014, e89033. https://doi.org/10.1371/journal.pone.0089033
- T. Kawashima and T. Sato, "Adaptation in Sound Localization Processing Induced by Interaural Time Difference in Amplitude Envelope at High Frequencies," PLoS ONE, vol. 7, no. 7, July 2012, e41328. https://doi.org/10.1371/journal.pone.0041328