|dc.identifier.citation||Clifford, A. 2013. Reducing Microphone Artefacts in Live Sound. Queen Mary.||en_US
|dc.description.abstract||This thesis presents research into reducing microphone artefacts in live sound
with no prior knowledge of the sources or microphones. Microphone artefacts
are defined as additional sounds or distortions that occur on a microphone signal
that are often undesired.
We focus on the proximity effect, comb filtering and microphone bleed. In
each case we present a method that either automatically implements human
sound engineering techniques or we present a novel method that makes use of
audio signal processing techniques that goes beyond the skills of a sound engineer.
By doing this we can show that a higher quality mix of a live performance
can be achieved.
Firstly we investigate the proximity effect which occurs on directional microphones.
We present a method for detecting the proximity effect with no prior
knowledge of the source to microphone distance. This then leads to a method
for reducing the proximity effect which employs a dynamic filter informed by
Comb filtering occurs when the output of microphones reproducing the same
source are mixed together. We present a novel analysis of how the accuracy of
a technique to automatically estimate the correct delay of the source between
each microphone is affected by source bandwidth and the windowing function
applied to the data.
We then present a method for reducing microphone bleed in the multiple
source, multiple microphone case, both in determined and overdetermined configurations. The proposed method is extended from prior research in noise
cancellation, which has not previously been applied to musical sound sources.
We then present a method for simulating microphone bleed in synthesised drum
recordings, where bleed enhances the realism of the output.
Through subjective listening tests and objective measures each proposed
method is shown to succeed at reducing the microphone artefacts while preserving
the original sound source.||en_US
|dc.publisher||Queen Mary University of London||en_US
|dc.title||Reducing Microphone Artefacts in Live Sound||en_US
|dc.rights.holder||The copyright of this thesis rests with the author and no quotation from it or information derived from it may be published without the prior written consent of the author||