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| ELEN0018-1 | Electroacoustics
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| Duration : | 30h Th, 30h Pr |
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| Number of credits : |
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| Lecturer : | Jean‑Jacques Embrechts |
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Language(s) of instruction :
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| French language |
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Course contents :
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| Course description
Electroacoustics is intended to provide a solid basis for the study and design of electroacoustic transducers (microphones and loudspeakers) through electrical analogues of the acoustical and mechanical systems involved.
Contents
- Interaction between the sources and their acoustic environment (radiation, propagation, reflection)
- Kundt standing wave tube
- Electro-mechano-acoustic analogues
- Microphones modelling and properties (electrostatic, electrodynamic, directional)
- Electrodynamic loudspeakers modelling and properties (baffles, enclosures)
- Additional subjects (depending on time available): measurement of acoustic impulse responses (MLS,sweeps), microphone arrays or loudspeakers systems (spatial audio).
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Learning outcomes of the course :
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| At the end of the course, it is intended that the student will be able to:
- identify the fundamental variables and the types of acoustic propagation and the types of sources,
- calculate the radiation impedance of acoustic sources,
- determine and measure (under normal incidence) the reflection coefficient and acoustic impedances of material samples,
- set up the electrical model of electro-mecano-acoustical systems,
- develop the electroacoustical model of microphones and determine their main parameters,
- develop the electroacoustical model of loudspeakers and determine their main parameters,
- measure the principal characteristics of loudspeakers and other electroacoustical systems.
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Prerequisites and co-requisites/ Recommended optional programme components :
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| Fundamentals of electrical circuits analysis
Mathematics : differential equations |
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Planned learning activities and teaching methods :
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| First of all, this course is organised in modules, each of them consisting in a general presentation ex cathedra. Some modules are followed by applications and exercices with the teacher.
Two laboratory measurement sessions are planned, one for the measurement of reflection coefficients with the Kundt tube and the other for the measurement of loudspeakers' properties. The presence of the students to these sessions is mandatory. These laboratory sessions are only organised once per academic year.
It is recommended that the students actively participate to the general presentation by answering questions and formulate critics. Also during the exercices, the students must be equipped with a calculator.
It is also recommended to read and understand the theory and exercices of the previous lesson before assisting to the next one. Additional exercices will also be proposed: it is strongly recommended that the students try to solve them by themselves and ask the teacher to evaluate their solution. |
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Mode of delivery (face-to-face ; distance-learning) :
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| Face-to-face learning |
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Recommended or required readings :
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| The learning materials and documents will be provided by the teacher.
Indicative texts:
Rossi M., Audio, Presses polytechniques et universitaires romanes (2007)
Leach, Introduction to Electroacoustics and Audio Amplifier Design - 2nd edition, Kendall/Hunt Publishing Cy (2001)
Watkinson, The art of sound reproduction,Focal Press (1998) |
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Assessment methods and criteria :
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| A written examination is organised in may-june and a second one in august-september (2nd session). The student will answer to questions concerning the theoretical matters and exercises that have been exposed during the presentations ex-cathedra and the laboratory sessions.
Learning materials and documents can be consulted for the solution of exercises only, unless otherwise stated (it is recommended to be equipped with an electronic calculator). |
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Organizational remarks :
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| This course is organised during the second quadrimester, at the Montefiore Institute B28. |
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Contacts :
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| J.J. Embrechts |
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