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Music Tech Away Day 2012

Music Tech Away Day 2012. Overview of current research supervisions: Mark Mynett – PhD p/t - Music Production for Contemporary Metal Steve Fenton – PhD p/t - Objective Measurement of Sound Quality in Music Production

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Music Tech Away Day 2012

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  1. Music Tech Away Day 2012 • Overview of current research supervisions: • Mark Mynett – PhD p/t - Music Production for Contemporary Metal • Steve Fenton – PhD p/t - Objective Measurement of Sound Quality in Music Production • Braham Hughes – PhD p/t - Development of a Tool to Assist in the Creation of Effective Audio/Visual Environments in Film and TV post-production • Neil Fitzpatrick – PhD p/t - The Global Studio: An evaluation of emergent technologies and practices relating to real-time online collaboration and production of popular music • Ruth Taylor – EntD p/t - An Alternative Model for Enterprise in Higher Education • Chris Dewey - MRes p/t - A Visual Interface for Mixing Popular Music • Currently being examined: • Ben Evans - MRes p/t - The Evaluation and Optimisation of FFT and Multiresolution FFT parameters for use in automatic music transcription algorithms Jonathan P Wakefield

  2. Interface for Mixing Popular Music • User interface for mixing (and recording) sound really hasn’t changed in 50 years • Is it the best interface? • Does it provide all the information an engineer needs? • Rather than the channel strip approach can’t we provide views of the whole mix? • We’re drawing on ideas from David Gibson (see left) but importantly trying to make a practical tool for engineers • Current thinking is to flag up problems in mix to engineer for manual resolution but may move into automating of aspects of mixing Jonathan P Wakefield

  3. Ambisonic decoders for 5.1 • Development of improved Ambisonic decoders for 5.1 surround sound playback • Horizontal only Ambisonics (omnimic plus 2 figure of 8s) • Can convert a mono source to Ambisonics B format: Speaker feeds are then: Jonathan P Wakefield

  4. Ambisonic decoders for 5.1 • So we need to find values 15 for parameters for a working decoder • Determined by having a multi-objective fitness function that is based Gerzon’s meta-theory of localisation which is based on: • Velocity vectors • Energy vectors • Vectors quantify low to mid and high frequency localisation performance • A heuristic search algorithm is used to find parameter sets with good fitness values • We run multiple local searches to come up with a “good” parameter set • We have also done two HPC implementations where we have ran exhaustive global searches at reduced parameter resolution Jonathan P Wakefield

  5. Ambisonic decoders for 5.1 • Have developed decoders that : • Provide even performance around listener • Take account of Human Spatial Resolution (MMA) • Optimise for multiple off centre listeners • Optimise for constrained listening spaces (and simultaneously determine best speaker positions within constraints) • Also developed a Design Tool • Used Range-Removal and Importance concepts in fitness function • 1st Order, 2nd Order, 4th Order decoders Jonathan P Wakefield

  6. Ambisonic decoders for 5.1 • Currently doing listening tests to confirm validity of velocity and energy vectors in determining human perception of localisation • Future Work • Trying to find a way to convert discrete 5.1 mixes into Ambisonic format ?!?!?!? • Extend to with height surround sound reproduction • Compensate for playback room acoustics Jonathan P Wakefield

  7. Loudspeaker Arrays • Planned experiments: • Single line: • Automatically take stereo and play across (say) 9 speakers instead of stereo pair • Get multi-track and pan to 9 speakers and compare to stereo mix • Get producers to mix to format and compare to stereo mix • Do same for 2-D spearker arrangement Jonathan P Wakefield

  8. Computer-based Musical Evolution • Tim Milllea – Automated Composition of Popular Music • Need to analyse existing good songs • Analysis feeds into a fitness function • Genetic Algorithms evolves a population of solution guided by fitness function • GA needs a crossover function (hierarchical) • GA also needs a mutation function • With Dr Steven Jan • Replicating the evolution of music (classical/folk) • Unsuccessful AHRC bid this year • Supervising a Visiting Researcher/ Academic for 12 months • Also have a German Cognitive Sciences undergraduate coming for 3 months Jonathan P Wakefield

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