Active Control of Engine Sound Quality in a Passenger Car Using a Virtual Error Microphone
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A new algorithm for controlling sound quality actively in a car cabin using a virtual error microphone (VEM) is considered in this paper. Active sound quality control (ASQC) is known to improve engine sound in a cabin by canceling boomings and enhancing some engine order sound at the same time. The VEM based ASQC (VEM-ASQC) algorithm in this study is devised to relocate a controlled sound zone formed at an error microphone position to the driver’s ear position where a virtual error microphone locates. Since the error microphone just by the driver’s ear can block free movement of the driver’s head, the error microphone can be positioned just beneath the ceiling in a cabin. A target profile containing the sound level in dB of the nine engine orders from C2 to C6 with the half-order interval was pre-designed. Control experiments in real-time were carried out at the neutral mode of an actual car when the engine speed was swept from 1000 to 4800 RPM. Experiment results showed that the performance of the VEM-ASQC algorithm was achieved required sound quality within small errors. Therefore, the VEM-ASQC algorithm can be applied to the practical implementation in a passenger car by reducing the degradation effect due to the distance between the driver’s ear and the error microphone.
KeywordsActive control Sound quality Virtual error microphone Target tracking control Relocation of controlled sound zone
This work was supported by the Incheon National University Research Grant in 2015.
- 1.Elliott, S.J.: Signal Processing for Active Control. Academic Press, Cambridge (2001)Google Scholar
- 3.Elliott, S.J., Stothers, I. M., Nelson, P. A., McDonald, A. M., Quinn, D. C., Saunders, T.: The active control of engine noise inside cars. In: INTER-NOISE and NOISE-CON Congress and Conference Proceedings, vol. 1998, pp. 987–990 (1998)Google Scholar
- 5.Couche, J., Fuller, C.: Active control of power train and road noise in the cabin of a sports utility vehicle with advanced speakers. In: Proceedings of the 1999 International Symposium on Active Control of Sound and Vibration, pp. 2–4 (1999)Google Scholar
- 7.Kuo, S.M., Morgan, K.R.: Active Noise Control, Algorithms and DSP Implements. Wiley, Hoboken (1996)Google Scholar
- 10.Elliott, S.J., David, A.: A virtual microphone arrangement for local active sound control. In: Proceedings of the 1st International Conference on Motion and Vibration Control, pp. 1027–1031 (1992)Google Scholar
- 11.Roure, A., Albarrazin, A.: The remote microphone technique for active noise control. In: INTER-NOISE and NOISE-CON Congress and Conference Proceedings, pp. 1233–1244 (1999)Google Scholar
- 15.Renault, S., Rymeyko, F., Berry, A.: Active noise control in enclosure with virtual microphone. Can. Acoust. 28, 72–73 (2000)Google Scholar
- 16.Cerrato, G.: Automotive sound quality-powertrain, road and wind noise. Sound Vib. 43, 16–24 (2009)Google Scholar
- 17.Sasaki, M., Nakashima, K.: Human auditory models and sound quality evaluation method for diesel noise. SAE Technical Paper, p. 2007-01-2219 (2007)Google Scholar