Reluctance Force Compensation for the Nonlinear Control of a Loudspeaker

Lazar J, Brunet PM. Reluctance Force Compensation for the Nonlinear Control of a Loudspeaker. In: AES Convention 149. Audio Engineering Society; 2020. Paper 10425. Available from: https://aes.org/publications/elibrary-page/?id=20962

@inproceedings{Lazar2020_20962,
  author = {Lazar, James and Brunet, Pascal M.},
  title = {{Reluctance Force Compensation for the Nonlinear Control of a Loudspeaker}},
  booktitle = {AES Convention 149},
  note = {Paper 10425},
  year = {2020},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=20962}
}

TY  - CPAPER
TI  - Reluctance Force Compensation for the Nonlinear Control of a Loudspeaker
AU  - Lazar, James
AU  - Brunet, Pascal M.
T2  - AES Convention 149
M1  - Paper 10425
PY  - 2020
DA  - 2020/10/06
UR  - https://aes.org/publications/elibrary-page/?id=20962
PB  - Audio Engineering Society
LA  - en
AB  - The motor structure of a conventional electrodynamic loudspeaker driver relies on a Lorentz force to move the loudspeaker diaphragm and generate sound. The reluctance force is an undesired consequence of this very motion, causing the displacement of the diaphragm to be other than that intended based on the Lorentz force acting alone. In other words, the reluctance force generates distortion in the audio output. Reluctance force compensation provides a method for controlling the motion of the diaphragm, taking into account the excursion dependent variation of the voice-coil inductance that generates the reluctance force. Based on a target diaphragm displacement, a nonlinear control algorithm utilizing reluctance force compensation calculates a corrected drive signal to drive the loudspeaker, producing a more ideal trajectory of the diaphragm, and reducing distortion in the audio output.
ER  -