Optimal Levels and Measurement Time for Separation of Nonlinear Components

Agerkvist FT. Optimal Levels and Measurement Time for Separation of Nonlinear Components. In: Express Paper. Audio Engineering Society; 2026. Paper 413. Available from: https://aes.org/publications/elibrary-page/?id=23243

@inproceedings{Agerkvist2026_23243,
  author = {Agerkvist, Finn T.},
  title = {{Optimal Levels and Measurement Time for Separation of Nonlinear Components}},
  note = {Paper 413},
  year = {2026},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=23243}
}

TY  - CPAPER
TI  - Optimal Levels and Measurement Time for Separation of Nonlinear Components
AU  - Agerkvist, Finn T.
M1  - Paper 413
PY  - 2026
DA  - 2026/05/28
UR  - https://aes.org/publications/elibrary-page/?id=23243
PB  - Audio Engineering Society
LA  - en
AB  - Linear loudspeaker parameters are often estimated via fitting of transferfunctions, under the assumption of linearity. This paper investigates the corruption of the measurement caused by nonlinearities in the system and presents a new and improved method for separating the true linear response from the nonlinear components by analyzing a sequence of measurements done at different levels. The method is improved by analyzing the influence of the chosen measurement levels as well as the measurement time at each level and presents numerically optimal values for the most typical cases of nonlinear behaviour. While the influence of noise and nonlinear distortion can be eliminated completely in the case of finite orders of nonlinearities on the system, the method is also shown to provide improved accuracy in the more realistic case where all orders are present but only a finite number of them dominate.
ER  -