Music Tech Away Day 2012

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23 Οκτ 2013 (πριν από 4 χρόνια και 15 μέρες)

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Music Tech Away Day 2012

Jonathan P Wakefield

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


Interface for Mixing Popular Music

Jonathan P Wakefield

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

Ambisonic decoders for 5.1

Jonathan P Wakefield

Development of improved
Ambisonic

decoders for 5.1 surround sound playback



Horizontal only
Ambisonics

(
omni

mic

plus
2 figure of 8s)


Can convert a mono source to
Ambisonics

B format:

Speaker feeds are then:

Ambisonic decoders for 5.1

Jonathan P Wakefield


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

Ambisonic decoders for 5.1

Jonathan P Wakefield

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


1
st

Order, 2
nd

Order, 4
th

Order decoders

Ambisonic decoders for 5.1

Jonathan P Wakefield


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



Loudspeaker Arrays

Jonathan P Wakefield

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

Computer
-
based Musical Evolution

Jonathan P Wakefield


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