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Loudspeaker voice-coil temperature estimation
2008 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The temperature in the voice-coil of a loudspeaker is an important variable in the sense of protection against failure. In order to estimate the temperature in the voice-coil an adaptive filter has been used. The adaptive filter utilises a system identification setup. The impulse response of the loudspeaker is estimated and the impedance of the loudspeaker can therefore be derived. This is performed while the loudspeaker is under normal use, that is, with music as input. A curve fitting is performed on the impedance derived from the adaptive filter. This is done in order to describe the loudspeaker with its linear parameters. The relationship between the DC-resistance of the loudspeaker voice-coil and temperature is well-known. Therefore the temperature can be derived when the impedance is known. The accuracy of the system described in this thesis is not good enough for correctly estimating the temperature but this is believed to be measurement errors.

Place, publisher, year, edition, pages
Keyword [en]
Technology, loudspeaker, voice-coil, voice coil, temperature, adaptive, filter, impedance, protection, linear parameters, thermal, modelling, impulse, response, electromechanical resonance, högtalare, temperatur, talspole, termisk modell, resonans
Keyword [sv]
URN: urn:nbn:se:ltu:diva-42087ISRN: LTU-EX--08/096--SELocal ID: 02606cc2-c26a-4cac-ad9e-7d2036e2788fOAI: diva2:1015303
Subject / course
Student thesis, at least 30 credits
Educational program
Electrical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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