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SGN-9206 Signal processing graduate seminar II
Fall 2006: Digital audio effects

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Course information

SGN-9206 Signal Processing Graduate Seminar II: Digital audio effects

Lectured in Fall 2006, Periods I - II

5 credits

The course is suitable for postgraduate studies

Instructors: Prof. Anssi Klapuri and Prof. Moncef Gabbouj

Literature: DAFX - Digital Audio Effects, Udo Zölzer (Ed.), John Wiley&Sons, 2002, 530 pages.

Lecture time and place

Per I,II: Thursday 14 - 16, TB223

Already scheduled presentations:

• 7.9.06 Introduction (Anssi Klapuri)
• 14.9.06 Modulators and demodulators (Pasi Pertilä)
• 21.9.06 Non-linear processing (Teemu Karjalainen)
• 28.9.06 Control of digital audio effects (Petri Hirvonen)
• 5.10.06 - no presentation -
• 12.10.06 - exam week, no seminar -
• 19.10.06 Time-frequency processing (Matti Ryynänen, Toni Heittola)
• 26.10.06 Spatial effects (Sakari Tervo, Teemu Korhonen)
• 2.11.06 Spectral processing (Elina Helander and N.N.)
• 9.11.06 Time and frequency warping music signals (Jouni Paulus)
• 16.11.06 - no presentation -
• 23.11.06 Source-filter processing (Jari Niemi)
  Time-segment Processing (Victor Popa)

Exam

The exam will be on Thursday 30.11.2006 at 9-12 o'clock.

Register for the exam in o-info by 22.11.

Presentation slides, exercises, and test samples

Are here.

(Forgot your password? E-mail to klap @ cs tut fi.)

The textbook can be borrowed from Anssi, room TF311.

Seminar contents and practical implementation

The aim of this seminar is to study the main fields of digital audio effects, based on the above-mentioned book.

There are many audio signal processing methods that are widely used in audio production and commercial products. Such methods include, for example, audio-specific filters (time-varying filters, comb filters, etc.), sound spatialisation and reverberation, time stretching and pitch shifting, phase vocoder effects, sinusoidal modeling, nonlinear effects etc.

The first lecture is given by the instructor. The rest of the seminar consists of student presentations. Topics are assigned on the first lecture. In practice:

• Each individual student prepares a 45-minute presentation (incl. discussion) on one of the chapters of the book. The longest chapters are split in two parts to make this possible. In each presentation, the basic DSP background is explained before going into the details of its audio application.
• Each students act as an opponent to one other student, giving feedback and asking questions before his/her presentation (based on draft slides prepared by the presenter) and during the presentation.
• The book contains MATLAB examples which are used as a basis to prepare mini-exercises about each chapter. Each presenter is responsible for preparing such an exercise and these are reviewed by the instructor before assigning them to the students. The attending students have to return the exercises to the instructor within 1 week after each presentation.

Literature

Book "DAFX - Digital Audio Effects," Udo Zölzer (Editor), John Wiley & Sons, 2002, 530 pages.

Table of contents

1. Introduction (U. Zölzer), 30 pages
2. Filters (P. Dutilleux, U. Zölzer), 32 pages
3. Delays (P. Dutilleux, U. Zölzer), 12 pages
4. Modulators and Demodulators (P. Dutilleux, U. Zölzer), 18 pages
5. Nonlinear Processing (P. Dutilleux, U. Zölzer), 44 pages
6. Spatial Effects (D. Rocchesso), 64 pages
7. Time-segment Processing (P. Dutilleux, G. De Poli, U. Zölzer), 36 pages
8. Time-frequency Processing (D. Arfib, F. Keiler, U. Zölzer). 62 pages
9. Source-Filter Processing (D. Arfib, F. Keiler, U. Zölzer), 74 pages
10. Spectral Processing (X. Amatriain, J. Bonada, A. Loscos, X. Serra), 66 pages
11. Time and Frequency Warping Musical Signals (G. Evangelista), 26 pages
12. Control of Digital Audio Effects (T. Todoroff), 34 pages
13. Bitstream Signal Processing (M. Sandler, U. Zölzer), 16 pages

Requirements for passing the course

• One oral presentation
• Preparing draft slides to opponents and final slides to participants
• Preparing an exercise (reviewed by instructor and assigned to the students)
• 70% or more attendance of lectures
• 70% or more completion of the exercises
• Final exam based on presentation materials
• Final mark assesment: 50% based on the presentation (and its material), 50% based on exam

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