Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Median HRIR Customization via Principal Components Analysis

주성분 분석을 이용한 HRIR 맞춤 기법

  • Published : 2007.07.20
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Abstract

A principal components analysis of the entire median HRIRs in the CIPIC HRTF database reveals that the individual HRIRs can be adequately reconstructed by a linear combination of several orthonormal basis functions. The basis functions represent the inter-individual and inter-elevation variations in median HRIRs. There exist elevation-dependent tendencies in the weights of basis functions, and the basis functions can be ordered according to the magnitude of standard deviation of the weights at each elevation. We propose a HRIR customization method via tuning of the weights of 3 dominant basis functions corresponding to the 3 largest standard deviations at each elevation. Subjective listening test results show that both front-back reversal and vertical perception can be improved with the customized HRIRs.

CIPIC HRTF database의 주성분 분석(PCA)을 통해 개인의 HRIR이 정규 직교화된 소수의 기저함수들의 선형 결합으로 잘 묘사됨을 알 수 있다. 이 기저함수들은 음원의 고도각, 청취자 마다 달라지는 HRIR의 변화를 표현할 수 있다. 선형결합에 사용되는 기저함수들의 가중치들은 음원의 고도각에 따라 특이한 경향을 지닌다. 또한, 각각의 음원 위치에서 가중치의 표준편차 크기순으로 기저함수의 중요도를 결정할 수 있다. 이 논문에서는 각 음원 위치마다 중요한 3개 기저함수의 가중치를 청취자가 직접 조절하게 함으로써 맞춤형 HRIR을 생성하는 방법을 제안한다. 주관평가 결과, 청취자의 음원 고도각 인지 성능과 음원 앞-뒤 구분 성능이 향상됨을 확인하였다.

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References

  1. Blauert, J., 1983, Spatial hearing, MIT, Cambridge, MA
  2. Brungart, D. S. and Rabinowitz, W. M., 1999, 'Auditory Localization of Nearby Sources. Head-related transfer functions', J. Acoust. Soc. Am., Vol. 106, pp. 1465-1479 https://doi.org/10.1121/1.427180
  3. Cheng, C. I. and Wakerfield, G. H., 2001, 'Introduction to Head-related Transfer Functions (HRTFs): Representations of HRTFs in Time, Frequency, and Space', J. Audio Eng. Soc., Vol. 49, pp.231-248
  4. Shimada, S., Hayashi, M. and Hayashi, S., 1994, 'A Clustering Method for Sound Localization Transfer Functions', J. Audio Eng. Soc., Vol. 42, pp. 577-584
  5. Middlebrooks, J. C., 1999, 'Virtual Localization Improved by Scaling Non-individualized External-ear Transfer Functions in Frequency', J. Acoust. Soc. Am., Vol. 106, pp. 1493-1510 https://doi.org/10.1121/1.427147
  6. Algazi, V. R., Duda, R. O., Morrison, R. P., and Thompson, D. M., 2001, 'Structural Composition and Decomposition of HRTFs' , In Proc. WASPAA01, New Paltz, NY, pp. 103-106
  7. Zotkin, D. N., Duraiswami, R. and Davis, L. S., 2002, 'Customizable Auditory Display', In Proc. Int. Conf. on Auditory Display (ICAD) , Kyoto, Japan
  8. Shin, K. H. and Park, Y., 2006, 'Customization of Head-related Transfer Functions Using Principal Components Analysis in the Time Domain (A)', J. Acoust. Soc. Am., Vol. 120, p. 3284
  9. Algazi, V. R., Duda, R. O., Thompson, D. M. and Avendano, C., 2001, 'The CIPIC HRTF database', In Proc. WASPAA01, New Paltz, NY, pp. 99-102
  10. Dunteman, G. H., 1989, PRINCIPAL COMPONENTS ANALYSIS, Sage Publication, Inc
  11. Martens, W. L., 1987, 'Principal Components Analysis and Resynthesis of Spectral Cues to Perceive Direction', Proc. Int. Computer Music Conf., pp. 274-281
  12. Kistler, D. J. and Wightman, F. L., 1992, 'A Model of Head-related Transfer Functions Based on Principal Components Analysis and Minimum-phase Reconstruction', J. Acoust. Soc. Am., Vol. 91, pp. 1637-1647 https://doi.org/10.1121/1.402444
  13. Wightman, F. L. and Kistler, D. J., 1989, 'Headphone Simulation of Free-field Listening. I: Stimulus Synthesis', J. Acoust. Soc. Am., Vol. 85, pp. 858-867 https://doi.org/10.1121/1.397557
  14. Wightman, F. L. and Kistler, D. J., 1989, 'Headphone Simulation of Free-field Listening. II: Psychophysical Validation', J. Acoust. Soc. Am., Vol. 85, pp. 868-878 https://doi.org/10.1121/1.397558