Extending the Wave Digital Filter Approach to Circuit Modelling

  • Extending the Wave Digital Filter Approach to Circuit Modelling

School of Electronics, Electrical Engineering and Computer Science
& ECIT Global Research Institute

Proposed Project Title:
Extending the Wave Digital Filter Approach to Circuit Modelling

Principal Supervisor:   Dr M van Walstijn          Second Supervisor:     Dr K J Werner (SAEL)

Project Description:

Virtual Analog models aim at recreating the sound of classic electrical audio gear (guitar distortion pedals and amplifiers, synthesizers, drum machines etc.) in digital algorithms. This expands access to popular vintage tools of recording and production to a wider group of musicians and can serve an important role in preserving the musical practices of the past.

The Wave Digital Filter approach to circuit modelling (and indeed lumped system modelling more broadly) considers the electrical components and the connection network of a circuit separately. A change of variables and appropriate discretization scheme yields a highly modular model that preserves a circuit's topology and energetic properties in the digital domain. Recent advances related to complex topologies and nonlinear circuit elements (transistors, diodes, valves) make Wave Digital Filters an attractive and increasingly systematic approach to Virtual Analog modelling.

This PhD project will involve extending and improving the Wave Digital Filter approach to handling circuits with multiple nonlinear elements using iterative solvers. The project will also tackle related issues of numerical scheme design, modelling time-varying circuits, reducing the computational burden of existing algorithms and exploring alternative wave variable definitions. The overall goal of the project is to increase the robustness and usability of the Wave Digital Filter approach to Virtual Analog modelling, while contributing to the state of the art of Wave Digital Filter theory in general.

The successful applicant will be part of a cross-school team of audio and music researchers at QUB and based at the Sonic Arts Research Centre (SARC), which has cutting-edge facilities for measurement, recording and projection of audio.

Contact details

Supervisor Name:                Dr M van Walstijn                                               Tel:         +44 (0)28 9097 4842
QUB Address:                      Sonic Arts Research Centre, Room 02 021            Email:    m.vanwalstijn@qub.ac.uk

2nd Supervisor Name:         Dr K J Werner                                                     Tel:         +44 (0)28 9097 5488
QUB Address:                      Sonic Arts Research Centre, Room 02 020            Email:    k.werner@qub.ac.uk