Active Loudspeaker Heat Protection

Tassart S, Valcin S, Menu M. Active Loudspeaker Heat Protection. In: AES Convention 136. Audio Engineering Society; 2014.pp. 9059:1-. Available from: https://aes.org/publications/elibrary-page/?id=17206

@inproceedings{Tassart2014_17206,
  author = {Tassart, Stéphan and Valcin, Simon and Menu, Michel},
  title = {{Active Loudspeaker Heat Protection}},
  booktitle = {AES Convention 136},
  pages = {9059:1-},
  year = {2014},
  month = apr,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=17206}
}

TY  - CPAPER
TI  - Active Loudspeaker Heat Protection
AU  - Tassart, Stéphan
AU  - Valcin, Simon
AU  - Menu, Michel
T2  - AES Convention 136
SP  - 1
M1  - Paper 9059
PY  - 2014
DA  - 2014/04/06
UR  - https://aes.org/publications/elibrary-page/?id=17206
PB  - Audio Engineering Society
LA  - en
AB  - Loudspeakers are devices that accumulate heat during their transduction process. The rise of temperature is potentially harmful for the voice-coil and must be countered by the active heat control (AHC) process when other passive and mechanical dissipation schemes become inefficient. Known AHC aim at limiting the voice-coil temperature through a closed-loop approach and may lead to oscillations and audio artifacts when temperature measurements are available with latency. This paper establishes that an open-loop AHC relying on a dynamic range compressor configured as a brick-wall limiter whose threshold is modulated by the temperature of the magnetic components insures a bounded voice-coil temperature. The temperature of the magnetic assembly and the driving force of the loudspeaker can be both estimated in real-time, respectively by a linear quadratic observer (a Kalman filter) and by an envelope follower. The new AHC scheme is demonstrated and compared to closed-loop AHC on a simulation example.
ER  -