Electroacoustics

Course Code: 
CEID_ΝΣΜ06
Period: 
Spring Semester
Partners: 
Ι. Μουρτζόπουλος
Credit Points: 
5

Course outline

Introduction

Electroacoustics (specialization areas, applications, history). General features and structure of sound systems, types of distortions in such systems, principles of sound perception and audio system reproduction

Sound sources, waves and quantities

Acoustic waves and equations. Frequency analysis of signals, relevant acoustic quantities, sound sources, directivity. Sound pressure level, loudness and noise measurement

Electromechanical and electrocoustical analogies, transduces and circuits

The relationships of the elements and the transduction in electro-mechanical-acoustical systems. Equivalent (analogous) circuits, transducer sensitivity and frequency response

Microphones

Principles of operation, types, electrical and acoustical characteristics. Use of microphones in recording

Loudspeakers

Principles of operation, types and technology evolution. Electromechanical system response and acoustic radiation. Electromagnetic loudspeaker drivers, analysis and equivalent circuits. Loudspeaker cabinets, cross-over circuits. Measuring loudspeaker systems and principles of design and construction

Room Acoustics

Significance, history and theoretical approaches. Principles of wave theory, sound field in an enclosed space, Reverberation Time, Geometric approach, use of Signal theory and processing. Speech intelligibility and acoustic reverberation. Systems for simulating, predicting and analysing room acoustics, computer software methods, Acoustics and Virtual Reality applications

Sound systems: general principles and acoustic coverage

Acoustic principles of electroacoustic and sound installations / systems.

Aspects of source / receiver distance, acoustic gain, delay, directivity. Loudspeaker properties, arrays, directivity, installation and acoustic system equalisation

Sound systems: electrical properties

Input/ output relationships. Preamplifier characteristics, operation and circuit analysis. Power amplifiers (stages, types, design, properties), digital amplifiers. Interconnections principles and practice in sound systems. Typical examples of sound systems and installations

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