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Active Sound Control Technology for Electrified Vehicles Based on Concept of Shepard Tones

Article of Honda R&D Technical Review Vol.33 No.1

Summary

Active Sound Control technology for electrified vehicles was developed in order to realize vehicle interior sound levels matching the seamless acceleration that is characteristic of driving under electric motor power. This technology takes the fundamental approach of generating sound based on the conceptual approach of Shepard tones and synchronizing it with the vehicle velocity. The main tones generated according to the theory of Shepard tones are superimposed with multiple sub-tones at preset frequency ratios. This approach can produce acceleration sounds with further increased freedom. An acceleration sound that differs from engine sound and has sounds matched to the electrified vehicle has been realized by means of this technology.

Reference

(1) Gwak, D. Y., Yoon, K., Seong, Y., Lee, S.: Application of subharmonics for active sound design of electric vehicles, The Journal of the Acoustical Society of America, Vol. 136, Issue 6, EL391, (2014)
(2) Kobayashi, Y., Inoue, T., Sano, H., Takahashi, A., Sakamoto, K.: Active sound control in automobiles, Proceedings of Inter-Noise 2008, p. 390-398, (2008)
(3) Hayashi, T.: Engine Sound Design Applying Active Sound Control - Acoustic Timbre and Image Localization Design Based on Motion and Source Perception of Vehicles -, Transactions of Society of Automotive Engineers of Japan, Vol. 47, No. 6, p. 1355-1359, (2016) (in Japanese)
(4) Kamogawa, T., Arimitsu, A., Kizawa, C., Gunji, M., Toi, T.: Evaluation of Acceleration Feel in Each Acceleration Section by the Change of Acceleration Sound, Transactions of Society of Automotive Engineers of Japan, Vol. 47, No. 6, p. 1381-1386, (2016) (in Japanese)
(5) Shepard, R. N.: Circularity in judgments of relative pitch, The Journal of the Acoustical Society of America, Vol. 36, Issue 12, p. 2346-2353, (1964)
(6) Shimizu, Y., Umeda, M., Mano, H., Aoki, I., Higuchi, T., Tanaka, C.: Neuronal response to Shepard’s tones. An auditory fMRI study using multifractal analysis, Brain Research, Vol. 1186, p. 113-123, (2007)
(7) Ishiketa, M., Sueyoshi, Y., Maruta, S., Iida, T., Konko, I., Iinuma, N.: Gakuten – Riron to Jisshu, ONGAKU NO TOMO SHA CORP., 240p., (1965) (in Japanese)
(8) Aiba, E., Tobitani, K., Shimotomai, T., Tani, M., Nagata, N., Fujisawa, T.: Chord Character Evaluation Model Based on Harmoniousness: Application to Music Mood Visualization Interface, Proceedings of SCIS-ISIS 2012, p. 131-135, (2012)

Author (organization or company)

Xun WANG(Innovative Research Excellence)、Takuma MAESAKA(Innovative Research Excellence)、Toshio INOUE(Innovative Research Excellence)

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