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MUS423 Research Seminars

The CCRMA Music 423 Research Seminar brings graduate students and supervising faculty together for planning and discussion of original research. Students and faculty meet either in small groups or individually, as appropriate for the research topics and interests of the participants. Research carried out is typically presented at the weekly CCRMA Colloquium (if it is of general interest to the CCRMA community) or at a Special DSP Seminar scheduled for that purpose.  In either case, announcements appear on the CCRMA Home Page as Upcoming Events.

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Recent DSP Seminars

  • KleinPAT: Optimal Mode Conflation For Time-Domain Precomputation Of Acoustic Transfer - Jui-hsien Wang, Adobe Research

    Date: 
    Fri, 05/29/2020 - 5:30pm - 6:30pm
    Location: 
    Zoom
    Event Type: 
    DSP Seminar
    Abstract: We propose a new modal sound synthesis method that rapidly estimates all acoustic transfer fields of a linear modal vibration model, and greatly reduces preprocessing costs. Instead of performing a separate frequency-domain Helmholtz radiation analysis for each mode, our method partitions vibration modes into chords using optimal mode conflation, then performs a single time-domain wave simulation for each chord. We then perform transfer deconflation on each chord’s time-domain radiation field using a specialized QR solver, and thereby extract the frequency-domain transfer functions of each mode. The precomputed transfer functions are represented for fast far-field evaluation, e.g., using multipole expansions.
    FREE
    Open to the Public
  • Complex Nonlinearities for Audio Signal Processing

    Date: 
    Fri, 04/24/2020 - 5:30pm - 6:30pm
    Location: 
    Online Zoom Meeting
    Event Type: 
    DSP Seminar
    We present an ongoing study of new and interesting nonlinear structures for audio signal processing, intended to be used for audio effects and synthesis. The broad intention is to fill the gap between simple, memoryless nonlinearities, and physics-based nonlinear models that require significant knowledge outside of DSP. We give a brief discussion of each nonlinear structure, and present a series of open-source audio plugins that implement the structures. Write-Up in Progress
    To receive your Zoom meeting link via email, please RSVP
    FREE
    Open to the Public
  • DDSP: Differentiable Digital Signal Processing

    Date: 
    Tue, 02/18/2020 - 5:30pm - 7:00pm
    Location: 
    CCRMA Classroom [Knoll 217]
    Event Type: 
    DSP Seminar
    Abstract: Classical DSP techniques have recently been overshadowed by deep learning for applications such as image recognition and audio generation. End-2-end learning has been key to this shift, enabling the optimization of high-dimensional nonlinear functions. However DSP techniques provide interpretability, modularity, and efficiency lacking from black-box deep networks. In this talk, I'll review the Differentiable Digital Signal Processing (DDSP) library, which enables direct integration of classic signal processing elements with deep learning methods.
    FREE
    Open to the Public
  • VCV Rack: Open-source virtual modular synthesis and introduction to module development in C++

    Date: 
    Wed, 07/03/2019 - 5:30pm - 7:00pm
    Location: 
    CCRMA Class Room [Knoll 217]
    Event Type: 
    DSP Seminar
    Abstract: VCV Rack is a new open-source virtual modular synthesizer for Mac/Windows/Linux based on the appearance, sound, and functionality of Eurorack and other modular formats. Its first stable version, 1.0, was recently released, including modular polyphony, a multi-threaded DSP engine, MIDI input/output, MIDI parameter mapping, and several other frequently-requested features. Rack's license allows open-source, freeware, and commercial plugins to be built using Rack's SDK, and its community has grown in the last two years to over 100,000 users and around 150 plugin developers, with over 1,200 modules currently available.

    Rack is written in C++ and processes modules with 1-sample buffers to allow low-latency feedback in patches.

    FREE
    Open to the Public
  • Deep Waveform Synthesis

    Date: 
    Thu, 05/30/2019 - 5:30pm - 7:00pm
    Location: 
    CCRMA Class Room [Knoll 217]
    Event Type: 
    DSP Seminar
    Abstract: Conventional audio synthesis (TTS, voice conversion, enhancement, etc) often relies on acoustic feature representations (spectrogram, MFCC, F0, etc.) and a signal processing procedure that infers the waveform from these features. However, such procedures often introduce artifacts caused by insufficient information in the feature representation (e.g. iSTFT without the correct phase info) and/or an oversimplified synthesis process (e.g. a source-filter model). Recent advancements battle this problem using deep learning: WaveNet, for example, generates the waveform sample-by-sample based on acoustic features and previously generated samples using a dilated convolutional net.
    FREE
    Open to the Public
  • MATLAB/Simulink Tools for Deep Learning, Signal Analysis, and Physical Modeling for Audio

    Date: 
    Thu, 05/16/2019 - 5:30pm - 7:00pm
    Location: 
    CCRMA Class Room [Knoll 217]
    Event Type: 
    DSP Seminar
    Abstract: MathWorks engineers will present an overview of MATLAB/Simulink functionality related to current CCRMA research, such as Deep Learning for Signal Processing (especially audio and music), Signal Analyzer App for working with signals in the time and frequency domains, and Simscape for Physical Modeling (spring-mass-damper systems, circuits, etc.).
    FREE
    Open to the Public
  • From signal representations to musical creation: a geometric approach

    Date: 
    Thu, 04/25/2019 - 5:30pm - 7:00pm
    Location: 
    CCRMA Class Room [Knoll 217]
    Event Type: 
    DSP Seminar
    Carmine Emanuele Cella, assistant professor in music and technology at CNMAT, will present work done in the last years in searching good signal representations that permit high-level manipulation of musical concepts. After the definition of a geometric approach to signal representation, the theory of sound-types and its application to music will be presented.  Finally, recent research on assisted orchestration will be shown and some possible musical applications will be proposed, with connections to deep learning methods.

    CNMAT, University of California, Berkeley: http://www.carminecella.com/index.html

    Open to the Public
  • Applied Machine Learning for Audio Classification

    Date: 
    Fri, 04/19/2019 - 5:30pm - 7:00pm
    Location: 
    CCRMA Class Room [Knoll 217]
    Event Type: 
    DSP Seminar
    Abstract: Ale Koretzky, Head of Machine Learning at Splice.com and creator of tuneSplit, will discuss and compare approaches and techniques for Audio Classification; from simple Nearest Neighbor methods like k-NN, to Decision Trees to Convolutional Neural Networks (CNN) and Deep Autoencoders. Using examples with real data, Koretzky will address the importance of both Feature Engineering and Feature Learning and how they can work together. At the end of the session, students should be able to implement most of the techniques but more importantly, develop the key intuitions behind Audio Classification in order to address any related problem with domain-specific data.
    FREE
    Open to the Public
  • Exploring Real-Time DSP Systems for Mixing and Performance

    Date: 
    Thu, 04/11/2019 - 5:30pm - 7:00pm
    Location: 
    CCRMA Class Room [Knoll 217]
    Event Type: 
    DSP Seminar
    Over the past four years, Jatin Chowdhury developed a wide variety of audio DSP systems intended to be used by mixing engineers and instrumentalists, including non-linear digital audio effects, timbral converters, binaural renderers, physical models, and more. This presentation will give a brief overview of all his previous works as well as several still in progress, along with more in-depth discussion of recent projects including notGuitar (a real-time timbral conversion system), various distortion effects, and NewMixer (a non-traditional mixing tool).
    FREE
    Open to the Public
  • Two Approaches to Virtual Analog Modeling

    Date: 
    Thu, 04/20/2017 - 5:30pm - 7:30pm
    Location: 
    CCRMA Classroom
    Event Type: 
    DSP Seminar
    This week's DSP seminar will feature THREE short conference-style talks on Virtual Analog Modeling. First, resident wave digital filter expert Mike Olsen and recent CCRMA alum Dr. Kurt James Werner will review papers on two aspects of the Wave Digital Filter formalism. Second, Ben Holmes (PhD candidate, Sonic Arts Research Centre, Queen's University Belfast) will present his work on characterizing physical Virtual Analog models of audio circuits.

    FREE
    Open to the Public
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