Electrical Equivalent Loudspeaker Modelling and DSP Correction

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master_Elliott_Jamie_2024.pdf (18.3 MB)

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Sähkötekniikan korkeakoulu | Master's thesis
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Date

2024-08-19

Department

Major/Subject

Acoustics and Audio Technology

Mcode

ELEC3030

Degree programme

CCIS - Master’s Programme in Computer, Communication and Information Sciences (TS2013)

Language

en

Pages

77+6

Series

Abstract

In this thesis, we will examine digital signal processing (DSP) in loudspeakers, and develop a novel loudspeaker design and DSP implementation tool using a Teensy microcontroller and electrical equivalent loudspeaker modelling. The thesis starts with a review of electrical equivalent modeling theory and loudspeaker design considerations, and then moves on to the development and testing of the loudspeaker design and filtering tool. The motivation of the thesis is to provide accessible loudspeaker modelling, design, and DSP implementation for loudspeaker creators and researchers, but particularly for DIY loudspeaker enthusiasts. A user is to be able to enter loudspeaker driver parameters and loudspeaker enclosure volume, and then adjust DSP systems such as crossover and parametric equalisation in order to produce a desired or corrected loudspeaker frequency response. The design tool is to create DSP code that can be uploaded to a microcontroller for real-time implementation of the adjusted DSP loudspeaker settings. Validation of the model is achieved through comparison to corresponding real world loudspeaker acoustical measurements. These measurements will be undertaken at Aalto acoustic laboratory in an anechoic environment. Frequency response measurements will be compared to the modelled frequency responses of corresponding loudspeaker-driver and enclosure pairings. Alongside a viable modelling tool, the thesis introduces a viable inexpensive alternative to current market DSP options, whilst in many cases offering enhanced functionality, and expanded design possibilities with its microcontroller based implementation.

Description

Supervisor

Pulkki, Ville

Thesis advisor

Öyry, Aleksi

Keywords

loudspeaker, electroacoustics, microcontroller, DSP, modelling

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https://urn.fi/URN:NBN:fi:aalto-202408255646

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[dipl] Sähkötekniikan korkeakoulu / ELEC