Comparison of acoustic, electric and laser contactless displacement measurements applied to observe nonlinear behaviour of diaphragm movement in dynamic loudspeakers

• Autorzy: Kmiecik Michał , Pluta Marek J.
• Języki publikacji: EN

Abstrakty

EN

Dynamic loudspeakers introduce distortion into reproduced auditory signal, especially in case of operation with high power or low frequency. Assessment of distortion by measuring current of voice coil should allow to compensate or prevent the product of distortion. The paper contains a comparison of displacement capture by optical triangulation displacement sensor, acoustic signal acquired using microphone, voltage and current. In case of processing low frequency signals, acoustic signal captured by microphone is dominated by harmonics of the fundamental frequency, and the laser displacement sensor provides more accurate information about the diaphragm displacement. Harmonics recorded in current have the same character as the displacement signal for low frequency, but for frequencies above the resonance, acoustic signal is a better source of displacement information.

Słowa kluczowe

EN

dynamic loudspeaker; nonlinear distortion; laser displacement sensor

PL

głośnik dynamiczny; zniekształcenia nieliniowe; laserowy czujnik przemieszczenia

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2023
• Tom: Vol. 34, nr 2
• Strony: art. no. 2023203
• Opis fizyczny: Bibliogr. 29 poz., il. kolor., fot., rys.

Twórcy

autor

Kmiecik Michał

• Department of Mechanics and Vibroacoustics, AGH University of Krakow, Al. Mickiewicza 30, 30-059 Krakow, Poland

• https://orcid.org/0000-0003-4180-0920

autor

Pluta Marek J.

• Department of Mechanics and Vibroacoustics, AGH University of Krakow, Al. Mickiewicza 30, 30-059 Krakow, Poland

• https://orcid.org/0000-0002-2519-8135

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).