Print Email Facebook Twitter Digital implementation of motional feedback in a bass loudspeaker Title Digital implementation of motional feedback in a bass loudspeaker Author Eveleens, Richard (TU Delft Electrical Engineering, Mathematics and Computer Science) Gottmer, Leila (TU Delft Electrical Engineering, Mathematics and Computer Science) Haarman, Mart (TU Delft Electrical Engineering, Mathematics and Computer Science) Contributor Janssen, G.J.M. (mentor) Serdijn, W.A. (graduation committee) van Genderen, A.J. (graduation committee) Degree granting institution Delft University of Technology Programme Electrical Engineering Project EE3L11 Bachelor graduation project Electrical Engineering Date 2020-06-29 Abstract This thesis report focuses on possible methods of digital implementation of motional feedback in a bass loudspeaker. In this thesis, the control system will be created for a monopole and a dipole speaker specifically. It does so by sketching the outlines of such a system and examining possible designs for the components required to suppress distortion which is mainly created by the speaker. This thesis shows that the digital implementation indeed allows filtering with very little latency but there are limitations in accuracy due to the conversion from the analogue to the digital domain. It is shown in this thesis that a partly analogue and partly digital system is desired for better error correction. A desired input-output gain of 30=29.54dB is achieved. The controller that is suggested is a controller based on the transfer function of the speaker. By transforming the input signal with the inverse of this open-loop transfer, the closed-loop transfer will be flattened. The instrumentation amplifier used to subtract the feedback signal from the input signal is designed such that the influence of the quantization noise is minimized. Loop-gain is added by the instrumentation amplifier, the controller and voltage-to-current amplifier. By creating loop-gain as much as possible using the digital implementation, noise is suppressed from 30dB up to 90dB within the range of frequencies of interest. The designed components in the motional feedback system allow a loop-gain up to 70dB and an input to output voltage gain of 30dB before instability occurs. Subject Motional Feedback ControlloudspeakerbassDigital To reference this document use: http://resolver.tudelft.nl/uuid:13bba375-eab7-41e9-9810-36d6841807b6 Part of collection Student theses Document type bachelor thesis Rights © 2020 Richard Eveleens, Leila Gottmer, Mart Haarman Files PDF BGP_Thesis_Control.pdf 2.65 MB Close viewer /islandora/object/uuid:13bba375-eab7-41e9-9810-36d6841807b6/datastream/OBJ/view