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3-Day Lecture "Sound Quality of Audio Systems"

The annual lecture on “Sound Quality of Audio Systems” presented by Prof. Dr. Wolfgang Klippel, honorary professor of the Institute of Acoustics and Speech Communication (Technical University of  Dresden), will give you a deep understanding of the latest measurement and diagnostic techniques used in telecommunication, automotive, multi-media and professional applications to design small, light and cost-effective loudspeakers.

The generation of signal distortion is modeled by linear, nonlinear, and time-variant systems with lumped and distributed parameters. The course makes the relationship between symptoms and physical causes of the distortion more transparent. Practical sections will give each participant further opportunities for learning by doing.


Key Topics

  • Comprehensive assessment of audio systems
  • Physical measurement and perceptional evaluation
  • Root cause analysis of signal distortion
  • Designing Green Speakers - providing more output with higher efficiency and lower cost
  • Active control of electro-acoustical transducers

Highly Recommended for

  • Students and teachers of the electro-acoustics
  • Engineers of the audio industry active in research & development, manufacturing, quality control

Content of the 3-Day-Lecture

Electro-Acoustical Modeling

  • Fundamentals - transduction, vibration, radiation
  • Abstraction - models with lumped and distributed parameters
  • Small signal performance - linear approximation and transfer function
  • Large signal performance - thermal dynamics and nonlinearities
  • Time-varying properties - influence of climate and aging

Interpretation and Diagnostics

  • Interpretation - measured symptoms and physical causes
  • Perception - audibility, and impact on perceived sound quality
  • Evaluation - selection of optimal drive units for system design
  • Specification - minimal but comprehensive set of data
  • Tolerances - variation of parameters and influences

Measurement and Analysis

  • Persistent excitation - artificial and natural stimuli
  • Monitored signals - electrical, mechanical, and acoustical sensors
  • Complex structures - digital and analog components
  • Sound field - measurements in the near and far field
  • Interaction with the room - direct and diffuse sound part
  • Measurement time - ultra-fast and long-term (power) testing
  • Distortion analysis - linear and nonlinear components
  • System identification - optimal fitting and parameter estimation
  • Transformations - fourier, wavelet, and perceptual modeling
  • Data compression - separation of unique and redundant information