Portale di Ateneo - Unibs.it Portale di Ateneo - Unibs.it

Introduction

Motivation of digital audio processing. Course and exam description.

Review of the basic concepts of DSP

Review of the Fourier Transform for Discrete Time Signals.
Review of the Zeta transform.
Introduction and main properties of the DFT.
FIR and IIR filters.

Elements of acoustics and psychoacoustics

Introduction to acoustics and sound propagation.
Elements of psychoacoustics. The hearing system.
Critical bands. Consonance and dissonance.
Notes, harmony, pitch, timbre.
Tuning systems.
Introduction to room acoustics.

Sound analysis tools

A/D conversion of the audio signal. The Discrete Time Fourier Transform (DFT). Windowing. The Short-Time Fourier Transform (STFT).
Sub-band decomposition and STFT.

Sound synthesis and modeling

Resolution of sinusoidal signals and windowing, Spectral interpolation,
Additive synthesis, sinusoidal peaks tracking, sinusoidal modeling.
Sound synthesis: additive and subtractive synthesis, granular synthesis, wavetable synthesis, nonlinear distortion (phase/frequency modulation).
Introduction to physical sound modeling for timbral synthesis.

Feature extraction

Low-level descriptors (Time Domain, Spectral and Timbral), Sound
Classification and similarity.
Audio features. Time-frequency localization. Pitch features. Chroma features.

Digital audio effects and 3D audio

Modulated digital delay lines, sound effects, reverberation and spatialization algorithms, binauralization, head-related transfer function, multi-channel processing, ambisonics.
Equalization: typical structures for equalization.
Fundamentals of microphone array signal processing.

Introduction to the speech signal

Acoustic theory of speech production. Analysis and modeling of the speech signal. Introduction to speech recognition, synthesis and coding.

Concluding remarks and examples

Audio retrieval. Cover song identification. Music representation. Introduction to audio and speech coding (MP3, AAC, ...). Concluding remarks.