Department of Computer Science, Unit Catalogue 2007/08 |
CM50201 Music and digital signal processing |
| Credits: 6 |
| Level: Masters |
| Semester: 1 |
| Assessment: EX100 |
| Requisites: |
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Aims: To introduce the ideas of DSP programming and the ways in which musical signals can be treated as data.
Learning Outcomes: 1. To be able to code simple digital filters, and construct simple oscillators; 2. To be able to control a frequency domain analysis and resynthesis; 3. To be able to use three synthesis methods; 4. An understanding of the key aspects of digital signal processing and their application; 5. The ability to critically evaluate and apply a suitable synthesis method for a given application. Skills: An understanding of digital sampling and filtering (T, A); an understanding of mathematical modelling and analysis of signals (T, A); synthesis and manipulation of digital music (T, F, A). Content: Introduction: Musical signals: their nature, characterisation and representation. Pitch, amplitude and timbre. PCM representation: sampling and quantisation errors. MIDI representation and its limitations. Software Systems: Music5 family,: Csound. Additive Synthesis: Simple oscillators and their coding; wavetable synthesis. Helmholz theory and Fourier analysis. Subtractive Synthesis: Noise, and digital filters. Filter types, IIR and FIR. Issues in filter design. Psycho-acoustics: Basic ideas and Shepard tones as an example. Lossy compression. MPEG level 2 and MPEG-4. Time and frequency domains: Phase vocoding. FFT and IFFT; analysis and resynthesis. Pitch changing. Physical Models: The wave equation. Delay lines and wave guides. The plucked string. FM and non-linear synthesis: Analysis and coding of FM. Introduction to Granular Synthesis, formants and FOF. Pitch changing. Spacialisation: Stereo panning, reverberation, localisation and audio clues. Composition: Process based, algorithmic composition. Pitch and Tuning: ET and Just; introduction to Sethares theory of consonance. |