Compensation of the Flux Modulation Distortion Using an Additional Coil in a Loudspeaker Unit

Antonello N, Agerkvist F. Compensation of the Flux Modulation Distortion Using an Additional Coil in a Loudspeaker Unit. In: AES Convention 137. Audio Engineering Society; 2014. Paper 9160. Available from: https://aes.org/publications/elibrary-page/?id=17483

@inproceedings{Antonello2014_17483,
  author = {Antonello, Niccolò and Agerkvist, Finn},
  title = {{Compensation of the Flux Modulation Distortion Using an Additional Coil in a Loudspeaker Unit}},
  booktitle = {AES Convention 137},
  note = {Paper 9160},
  year = {2014},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=17483}
}

TY  - CPAPER
TI  - Compensation of the Flux Modulation Distortion Using an Additional Coil in a Loudspeaker Unit
AU  - Antonello, Niccolò
AU  - Agerkvist, Finn
T2  - AES Convention 137
M1  - Paper 9160
PY  - 2014
DA  - 2014/10/06
UR  - https://aes.org/publications/elibrary-page/?id=17483
PB  - Audio Engineering Society
LA  - en
AB  - Flux modulation is one of the main causes of distortion in electrodynamic loudspeaker units. A new compensation technique that eliminates this type of non-linearity using an additional compensation coil in the speaker unit is presented. An equivalent circuit model of the device including the compensation coil is derived. The compensation technique consists on feeding the compensation coil and voice coil with filtered versions of the wanted audio signal. Simulations show that a significant reduction in flux modulation distortion can be achieved with this technique. A simple magnetic circuit has been constructed to test the method on a real device, and the measurements show the method works, also when eddy currents are present.
ER  -