Abstract
This paper presents a novel method to design and generate a target interior sound to achieve the desired sound qualities of “powerfulness” and “pleasantness” inside a car cabin. A powerfulness index and pleasantness index were developed to evaluate the perceptions of interior sound based on three sound metrics: booming sensation, rumbling sensation, and the order decay ratio of the recorded interior sounds. The indexes were used for subjective evaluation of a designed target sound. An active sound design (ASD) device with an optimal weighted adaptive order filter was employed to control the magnitude and phase of the sound order related to the engine’s revolution speed. A designed target sound with the desired sound quality was generated by the ASD device, which can also actively cancel out unwanted noise in a passenger car. Guidelines to design a target sound are proposed, and the way that the ASD device generates the target sound is presented. An example of the design and generation of a target sound inside a car cabin is also presented.
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Abbreviations
- Δp :
-
difference in sound pressure level, Pa
- A i :
-
amplitude i-th order, V
- f i :
-
frequency of the i-th order, Hz
- ϕ i :
-
phase of the i-th order, Radian
- B i :
-
booming index
- M i :
-
modulation index
- ODR:
-
order decay ratio
- μ :
-
step size
- L 0 :
-
optimal filter length
- y(n):
-
filter outpour
- e(n):
-
error output
- x(n):
-
filter input
- r(n):
-
reference signal
- d(n):
-
designed sound
- t(n):
-
target sound
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Acknowledgement
This work has supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2B5B02069400). This work was supported by INHA UNIVERSITY Research Grant.
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Lee, S.M., Back, J., An, K. et al. Design and Generation of a Target Sound to Achieve the Desired Sound Quality Inside a Car Cabin. Int.J Automot. Technol. 21, 385–395 (2020). https://doi.org/10.1007/s12239-020-0036-5
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DOI: https://doi.org/10.1007/s12239-020-0036-5