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    ミュージックテクノロジー

    • 公式コード:ITA01
    • 受講期間:3学期
    • 対象学年:修士1年, 2年
    • 区分:選択科目
    • 単位数:2
    • 進行役:Julián Villegas
    • 担当者:Julián Villegas、Michael Cohen.

    受講にあたって

    The purpose of this course is to study the fundamentals of audio signal processing and its application to music. Besides reviewing the underlying techniques, this course focuses in practical implementations of sound effects, so the course is intense in hands-on exercises, assignments, and projects mainly based on Matlab/Octave, C/C++, and Pure-data.

    講義の目的・目標

    • Students who approve this course are expected to understand the basic techniques employed in computer music, as well as the literature and terminology on this topic.
    • Students at the end of the term should be able to decide which of the presented techniques is best for creating a desired sound effect in music.
    • Upon completion of this course, students should be able to create their own sound effect chain.

    講義のスケジュール/各回のテーマ

    1. Introductions: Course overview, materials, examination, introduction to computer music technologies.
    2. Basic Filters: Parametric filters, FIR filters, Convolution, Equalizers, Shelving filters, Peak filters, Wah-wah filter, Phaser, Time-varying equalizers
    3. Delay: Basic delay structure, FIR comb filter, IIR comb filter, Universal comb filter, Fractional delay lines, delay-based audio effects, Vibrato, Flanger, chorus, slapback, echo, Multiband effects, Natural sounding comb filter.
    4. (continuation)
    5. Modulation: Ring modulator, Amplitude modulator, Single-side-band modulator, Frequency and phase modulator, Detectors, Averagers, Amplitude scalers, Vibrato, Stereo phaser, Rotary loudspeaker effect, SSB effects, Simple morphing: amplitude following, Modulation vocoder.
    6. (continuation)
    7. Nonlinear FXs: Dynamic range control, Limiter, Compressor and expander, Noise gate, De-esser, Infinite limiters, Musical distortion and saturation effects, Valve simulation, Overdrive, distortion and fuzz, Harmonic and subharmonic generation, Tape saturation, Exciters, Enhancers
    8. (continuation)
    9. Time-segment processing: Variable speed replay, Time stretching, Pitch shifting, Time shuffling and granulation
    10. Phase-vocoders: Basics, implementations, effects (time-frequency filters, dispersion, time stretching, pitch shifting, stable/transient components separation, mutating, robotization,whisperization, denoising)
    11. (continuation)
    12. Source-filter processing: ”Source-filter separation, Channel vocoder, Linear predictive coding (LPC) Cepstrum, Source-filter transformations, Vocoding or cross-synthesis, Formant changing, Spectral interpolation, Pitch shifting with formant preservation”
    13. (continuation)
    14. Time, Frequency warping : Algorithms for warping, Short-time warping and real-time implementation, Vocoder-based approximation of frequency warping, Time-varying frequency warping, Pitch-shifting inharmonic sounds, Inharmonizer, Vibrato, glissando, trill, etc.
    15. (continuation)

    教科書

    • U. Zölzer, editor. DAFX – Digital Audio Effects. John Wiley & Sons, New York, NY, USA, 2nd edition, 2011.
    • 担当者によって準備されたさまざまな資料

    本講義と関連のある講義

    この授業に先行科目はないものの、学生がPure-dataプログラミング のパラダイムや音声信号加工技術の概略に対して馴染みやすくなるとして推奨されています。以下のような講義がこの講座を受けておくことを奨励しています。

    • ITC02 音響音声入門
    • ITA07 応用信号処理
    • ITA10 仮想環境における空間音響学

    評価方法

    演習・クイズ 40%
    課題 30%
    最終プロジェクト 30%

    参考文献