Abstract
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.
Original language | English |
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Title of host publication | Proceedings of 137th Audio Engineering Society Convention 2014 |
Publication date | 2014 |
Pages | 775-784 |
Article number | Convention Paper 9160 |
ISBN (Print) | 9781634397483 |
Publication status | Published - 2014 |
Event | 137th Audio Engineering Society Convention - Los Angeles, United States Duration: 9 Oct 2014 → 12 Oct 2014 Conference number: 137 |
Conference
Conference | 137th Audio Engineering Society Convention |
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Number | 137 |
Country/Territory | United States |
City | Los Angeles |
Period | 09/10/2014 → 12/10/2014 |
Keywords
- Modeling and Simulation
- Acoustics and Ultrasonics
- Eddy currents
- Electric coils
- Modulation
- Audio signal
- Compensation coil
- Compensation techniques
- Electrodynamic loudspeakers
- Equivalent circuit model
- Flux modulation
- Voice coil
- Loudspeakers