Tomoaki Hidaka
Honda Access Corporation, Japan
Kyosuke Ochiai
Graduate School of Engineering, Ustunomiya University, Japan
Yamato Makoto
Right-EAR Limited Liability Company, Japan
Toshiyuki Kageyama
Honda Access Corporation, Japan
Hiroshi Hasegawa
Graduate School of Engineering, Ustunomiya University, Japan
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Published in: KEER2014. Proceedings of the 5th Kanesi Engineering and Emotion Research; International Conference; Linköping; Sweden; June 11-13
Linköping Electronic Conference Proceedings 100:33, p. 423-430
Published: 2014-06-11
ISBN: 978-91-7519-276-5
ISSN: 1650-3686 (print), 1650-3740 (online)
We conducted a subjective evaluation experiment to determine the optimal frequency characteristics for a car audio system during vehicle travel . In this experiment; the car interior noise typically generated when a vehicle travels at a speed of 60 km/h was added to the experimental sound sources; and subjective evaluation was made of the sound passed through filters modifying the frequency characteristics. A total of 10 types of sound sources were used in the evaluation (narration; fusion; classic; J-pop; vocal; healing; nature; jazz; rock; and pop). Five levels of frequency characteristic filter (-5 to -9 dB/oct.); which augmented the bass in response to car interior noise; were used. The evaluation terms were 12 pairs of words related to sound quality; comfort; added value; and safety. Higher evaluation scores were given to items of palatability and safety in the vicinity of the -6 dB/oct. filter level; which augmented the bass to a level slightly below the frequency characteristic curve of the car interior noise (?-7dB/oct.); and to items of sound quality and added value at the -9 dB/oct. filter level. Factor analysis was also conducted; to identify comfort; sound field; and clarity factors. Based on these factors; the filter results were compared. Higher comfort and clarity factor scores were obtained in the vicinity of the -6 dB/oct. characteristics versus those of other filters. These results confirmed that taking frequency characteristics into account in the performance of a car audio system during travel is effective in improving car interior comfort.
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