• Home

Conference_programme: 11: Measurement techniques

Lecture: An FFT-iFFT combination based transfer function approach to improve effectiveness of vehicle incab sound quality assessment

Author(s): Rajeev Kumar B R, Hegde Sumanth S, Iyer Ganesh R, Radhakrishnan Guruthangaraj

Customer comfort concerning a pleasing sound quality is key-towards achieving a competitive edge, specifically in the automotive industry today. This is more critical for vehicles falling into passenger car segments, specifically in the M1, M2 and M3 vehicle categories. With more focus towards NVH, it is important to also consider the “design for NVH” aspect in addition to fulfilling the primary requirements of performance, durability and legislative needs. With increasing focus towards electrification, the focus is also shifting towards improving the overall vehicle sound quality, be it, powertrain noise, operational sounds (such as door closure), or even improving the sound quality of the car-multimedia systems. The study conducted in this paper, details how incab sound quality can be front-loaded much earlier into the design. This has been illustrated with use of a simplified FFT-iFFT based approach to improve sound quality of vehicle multimedia systems. The audio quality tuning for car-multimedia system requires engineers to tune the hardware/amplifiers through rigorous audio jury tests within the cabin for different audio filter (Equalizer) settings. There is a huge dependency on vehicle cabin, as the cabin acoustic properties significantly affects the sound quality perception for a specific car multimedia audio filter settings. In this study, a unique method has been developed to eliminate the dependency of vehicle cabin properties in order to simulate the perception under laboratory conditions, with minimal dependency on vehicle availability. This paper also talks about how the simulated audio settings can then be used for conducting controlled sound quality jury testing in order to arrive at the most ideal filter settings for a specific vehicle design much earlier in the development phase.

Download the full paper

Corresponding author

Name: Mr Ganesh Ramakrishnan Iyer

e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Country: India