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

Linear, nonlinear and time-variant systems with lumped and distributed parameters model the generation of signal distortion. 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.

Highly Recommended for

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

3-Day Lecture

When: March 2025 
Where: Dresden University of Technology

Language: English

More INFORMATION coming soon. 

Presented by:

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

Digital Loudspeaker Control

  • Targets - Equalization, linearization, speaker protection, and self-testing
  • Mirror filter - Nonlinear structure derived from physical modeling
  • Adaptive control - Parameter feedback by using the speaker as a sensor
  • Green speaker design - Maximizing efficiency by exploiting nonlinearities and resonances
  • Intelligent transducer module - Combining DSP, amplifier, and transducer 

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 - Parameter variation and climate 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

New Topics of the 3-Day Lecture

  • IEC standard 60268-23 for testing large loudspeakers
    (panels, arrays, TV monitors, ...)
  • Rating max SPL according to IEC standard 60268-21
  • Testing transducers with small baffles on the KLIPPEL Multi-Scanning Workbench
  • Measuring the nonlinear residuum in reproduced music signals

由Wolfgang Klippel教授进行演讲