dc.contributor.advisor |
Abdulla, Waleed H. |
|
dc.contributor.author |
Munir, Muhammad Waqas |
|
dc.date.accessioned |
2021-10-15T02:28:15Z |
|
dc.date.available |
2021-10-15T02:28:15Z |
|
dc.date.issued |
2021 |
en |
dc.identifier.uri |
https://hdl.handle.net/2292/56995 |
|
dc.description.abstract |
This thesis investigates virtual active noise control (ANC) to attenuate noises
at remote locations. ANC is based on the principle of destructive interference
and has the advantages of high flexibility and easy adaptability, and it can
cancel unwanted low-frequency noises. Conventional ANC algorithms create
a zone-of-quiet at the location of an error microphone. However, some
applications include physical constraints with regard to the placement of the
error microphone at the desired locations. This thesis provides novel adaptive
solutions to generate a zone-of-quiet at remote locations. A numerical analysis
of an acoustic wave equation provides the basis for the development of closedform
expressions of the system model on spherical coordinates. The proposed
system model does not require a preliminary identification stage and instead
depends on modelling the transfer function between the error microphone and
the remote zone-of-quiet. Another contribution of this research is to formulate
the influence of psychoacoustics in remote ANC systems so as to minimise the
noise disturbance of human hearing by considering human auditory system
characteristics. A conventional ANC system's performance is compromised
when the impression of audio sensation on the human auditory system does
not match the ANC system's numerical values, which occurs because the
human ear has complex psychoacoustic properties. To improve the perceptual
acoustic impression on the listener's ear, psychoacoustic modelling is here
adopted in the modelling of the remote ANC system. The third contribution
of this thesis is the development of an adaptive algorithm that cancels the
unwanted narrowband noise at a remote location. The proposed parallel-form
remote ANC algorithm uses a delayless bandpass filter bank to cancel discrete
low-frequency noises. The fourth contribution is the analytical modelling of
a multichannel remote ANC headrest. The theoretical model is derived in an
acoustic domain using the geometrical parameters of the proposed prototype.
The results demonstrate that the proposed system projects the zone-of-quiet
to the listener's ears without the interference of physical error microphone.
In addition to several numerical models and computer simulations, an FPGA
Real-Time experimental setup was implemented through LabVIEW. Several
experiments were also performed to confirm the validity of the proposed
theoretical models. |
|
dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
PhD Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
|
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
|
dc.title |
Modelling Zone of Quiet under Virtual Active Noise Control Framework |
|
dc.type |
Thesis |
en |
thesis.degree.discipline |
Electrical and Electronic Engineering |
|
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Doctoral |
en |
thesis.degree.name |
PhD |
en |
dc.date.updated |
2021-08-30T11:16:27Z |
|
dc.rights.holder |
Copyright: The author |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/OpenAccess |
en |
dc.identifier.wikidata |
Q112956189 |
|