The lecture addresses the evaluation of sound reproduction systems using physical and perceptual measurement techniques. The generation of signal distortion is modeled by linear, nonlinear, and time-variant systems with lumped and distributed parameters. New measurement techniques based on those models are presented using test signals and music as well.
The course makes the relationship between symptoms and physical causes of the distortion more transparent and discusses the impact on the perceived sound quality by combining listening tests and auralization techniques with physical methods. This knowledge is important for defining target performance, designing small, light, and cost effective loudspeakers reproducing the sound at highefficiency and sufficient sound quality and for quality control in manufacturing.
The new methods and diagnostic tools are illustrated on loudspeakers used in telecommunication, automotive, multimedia, and professional applications. The lecture is supplemented by practical sections giving each participant further opportunities to learn by doing.
New topics for this year’s lecture include:
• Nonlinear distortion generated by break-up modes
• Physical causes, rocking modes, and remedies
• Comprehensive evaluation of active loudspeaker systems
• Designing green speakers providing more output with higher efficiency and lower cost
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