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Oscillating measurement motion - Myth or magic? Pt.1

 
: Hess, W.; Varga, S.

Audio Engineering Society -AES-:
137th Audio Engineering Society Convention 2014. Vol.1 : Los Angeles, California, USA, 9 - 12 October 2014
Red Hook, NY: Curran, 2015
ISBN: 978-1-63439-748-3
pp.240-251
Audio Engineering Society (AES Convention) <137, 2014, Los Angeles/Calif.>
English
Conference Paper
Fraunhofer IIS ()

Abstract
Acoustical reproduction in cars is different to acoustical reproduction in rooms or other larger environments. This is caused by the size of the car cabin, by surrounding materials as well as non-ideal loudspeaker enclosures and reproduction positions. In order to achieve spectrally well balanced sound systems, for most sound system tuning engineers acoustical measurements are essential. This paper analyses and describes different methods of measuring the frequency-gain behavior of a single loudspeaker. When captured at a single measurement position, often peaks and dips or notches in the form of comb-filters can be observed in the magnitude response. This work focuses on practical aspects: In which way is it possible to measure a magnitude response which describes the sound at the listening area as correct as possible? How can comb-filter effects be reduced? In which way is a fast and adequate measurement possible? Results showed a significant reduction of gain maxima and magnitude response fragmentation by movement of the measurement microphone. An evaluation by listening tests showed that magnitude response averaging by microphone movements led not only to smoother magnitude responses but also to a better sound experience through less equalization needed for compensation.

: http://publica.fraunhofer.de/documents/N-441928.html