General Information | | Modeling, Measurement and Nonlinear Control of Audio Systems The lecture addresses the measurement, evaluation, and active control of sound systems.The generation of signal distortion is modelled by linear, nonlinear and time-variant systems with lumped and distributed parameters. New parameter measurement techniques are presented. The relationship between symptoms and physical causes of the distortion is made transparent, and the impact on the perceived sound quality is discussed. This knowledge is important for designing and manufacturing small, light and cost-effective transducers that reproduce the sound at high efficiency and sufficient sound quality. Active, adaptive, and nonlinear control is explained in detail and practically evaluated. Consequences for speaker design for higher efficiency, high robustness, and less resources are presented. Date:
November, 12-13, 2024 | | Duration:
9 am - 5 pm | Location:
Feng Chia University, Taichung, Taiwan | | Presenters:
Dr. Stefan Irrgang and Jonathan Gerbet |
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Lecture Content
| | Electro-acoustical Modelling: - Fundamentals - Transduction, vibration, radiation
- Abstraction - Models with lumped and distributed parameters
- Small Signal Performance - Linear lumped parameters
- Large Signal Performance - Nonlinear and thermal parameters
- 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 influence
| Measurements and Analysis:- New fast parameter measurement
- Monitored signals - Electrical, mechanical and acoustic sensors
- Complex structures - Digital and analog components
(IEC 60268-21,22,23) - Sound field - Measurements in the near and far field
- Measurement time - Ultra-fast and long-term (power) testing
- Distortion analysis - Linear and nonlinear components
- System identification - Optimal fitting and parameter estimation
| | Active Speaker Control: - Compensation of linear and nonlinear distortion
- Speaker protection – Robustness and reliability
- Constant performance over the lifetime – Cope with aging,
climate, production variance - Maximizing output – Exploit the full working range
- Practical evaluation with test stimuli and music
- Hands-on experiments on a new smart amplifier IC
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