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All Outputs (125)

The 24-hour city : residents' sensorial experiences (2007)
Journal Article
Adams, M., Moore, G., Cox, T., Croxford, B., Refaee, M., & Sharples, S. (2007). The 24-hour city : residents' sensorial experiences. https://doi.org/10.2752/174589307X203092

The concept of the 24-hour city evokes vibrancy and a dynamic that suggests the harmonious coexistence of mixed land uses which might otherwise be considered improbable neighbors. In reality we see a 24-hour city full of diverse uses, needs and requi... Read More about The 24-hour city : residents' sensorial experiences.

The effect of visual stimuli on the horribleness of awful sounds. (2007)
Journal Article
Cox, T. (2007). The effect of visual stimuli on the horribleness of awful sounds. Applied Acoustics, 69(8), 691-703. https://doi.org/10.1016/j.apacoust.2007.02.010

A mass web-based experiment has been carried out to explore people’s perception of horrible sounds. The advantage of a web-based methodology is that it enables hundreds of thousands of judgements to be obtained over a diverse population. As part of t... Read More about The effect of visual stimuli on the horribleness of awful sounds..

Passive tuned loudspeakers as absorbers for room acoustics (2007)
Book Chapter
Oldfield, R., & Cox, T. (2007). Passive tuned loudspeakers as absorbers for room acoustics. In A. Calvo-Manzano, A. Pérez-López, & S. Santiago (Eds.), 19th International Congress on Acoustics : acoustics for the 21st century : Madrid, Spain, 2-7 September 2007. Madrid, Spain: Spanish Acoustical Society

This paper presents a novel approach to improving the performance, tunability and efficiency of low frequency membrane absorbers. It is shown that a passive loudspeaker within a cabinet can be used as an efficient and adaptable membrane absorber, wit... Read More about Passive tuned loudspeakers as absorbers for room acoustics.

A neural network model for speech intelligibility quantification (2007)
Journal Article
Li, F., & Cox, T. (2007). A neural network model for speech intelligibility quantification. Applied Soft Computing, 7(1), 145-155. https://doi.org/10.1016/j.asoc.2005.05.002

A neural network based model is developed to quantify speech intelligibility by blind-estimating speech transmission index, an objective rating index for speech intelligibility of transmission channels, from transmitted speech signals without resort... Read More about A neural network model for speech intelligibility quantification.

Sustainable soundscapes : noise policy and the urban experience (2006)
Journal Article
Adams, M., Cox, T., Moore, G., Croxford, B., & Refaee, M. (2006). Sustainable soundscapes : noise policy and the urban experience. Urban Studies, 43(13), 2385-2398. https://doi.org/10.1080/00420980600972504

This paper introduces regulatory components influencing city soundscapes in Europe and the UK, illustrating the abatement approach taken within noise policy, demonstrating the importance of individual experience in assessing the soundscapes of urban... Read More about Sustainable soundscapes : noise policy and the urban experience.

Improved membrane absorbers (2006)
Thesis
Oldfield, R. Improved membrane absorbers. (Dissertation). The University of Salford

This thesis presents research into two novel techniques for improving the low frequency performance, tunability and efficiency of membrane absorbers. The first approach uses a loudspeaker surround as the mounting for the membrane, increasing the movi... Read More about Improved membrane absorbers.

Maximum length sequence and Bessel diffusers using active technologies (2006)
Journal Article
Cox, T., Avis, M., & Xiao, L. (2006). Maximum length sequence and Bessel diffusers using active technologies. Journal of Sound and Vibration, 289(4-5), 807-829. https://doi.org/10.1016/j.jsv.2005.02.019

Active technologies can enable room acoustic diffusers to operate over a wider bandwidth than passive devices, by extending the bass response. Active impedance control can be used to generate surface impedance distributions which cause wavefront disp... Read More about Maximum length sequence and Bessel diffusers using active technologies.

Room acoustic parameter extraction from music signals (2006)
Journal Article
Kendrick, P., Cox, T., Zhang, Y., Chambers, J., & Li, F. (2006). Room acoustic parameter extraction from music signals. Proceedings of the ... IEEE International Conference on Acoustics, Speech, and Signal Processing, 5, V-801. https://doi.org/10.1109/ICASSP.2006.1661397

A new method, employing machine learning techniques and a modified low frequency envelope spectrum estimator, for estimating important room acoustic parameters including reverberation time (RT) and early decay time (EDT) from received music signals h... Read More about Room acoustic parameter extraction from music signals.

A profiled structure with improved low frequency absorption. (2006)
Journal Article
Wu, T., Cox, T., & Lam, Y. (2006). A profiled structure with improved low frequency absorption. ˜The œJournal of the Acoustical Society of America (Online), 110(6), 3064-3070. https://doi.org/10.1121/1.1412443

It is possible to obtain good absorption from Schroeder diffusers if suitable alterations to the design are made. Interestingly, previous work has shown that good absorption appears possible below the design frequency when the diffusers are poorly co... Read More about A profiled structure with improved low frequency absorption..

Ternary and quadriphase sequence diffusers (2006)
Journal Article
Angus, J., Cox, T., & D'Antonio, P. (2006). Ternary and quadriphase sequence diffusers. ˜The œJournal of the Acoustical Society of America (Online), 119(1), 310-319. https://doi.org/10.1121/1.2139632

A room acoustic diffuser breaks up reflected wavefronts, and this can be achieved by presenting a spatially varying surface impedance. In hybrid surfaces, varying impedance is achieved by patches of absorption and reflection, giving reflection coeffi... Read More about Ternary and quadriphase sequence diffusers.

Stability and sensitivity analyses for diffusers with single and multiple active elements (2005)
Journal Article
Avis, M., Xiao, L., & Cox, T. (2005). Stability and sensitivity analyses for diffusers with single and multiple active elements. Journal of the Audio Engineering Society, 53(11), 1047-1060

In comparison to active absorbers, active diffusers have more complicated target impedance functions, a smaller region of stable control, and are more sensitive to control impedance errors. The issues of stability and sensitivity are analyzed theoret... Read More about Stability and sensitivity analyses for diffusers with single and multiple active elements.

A stable transient BEM for diffuser scattering (2005)
Presentation / Conference
Hargreaves, J., & Cox, T. (2005, October). A stable transient BEM for diffuser scattering. Presented at 150th Meeting of the Acoustical Society of America, Minneapolis

Boundary Element Methods (BEM) may be used to model scattering from hard rigid surfaces such as diffusers. They have the advantage over volumetric methods that only the surface need be meshed and the surface velocity potential found. Unlike the mor... Read More about A stable transient BEM for diffuser scattering.

Active diffusers : some prototypes and 2D measurements (2005)
Journal Article
Xiao, L., Cox, T., & Avis, M. (2005). Active diffusers : some prototypes and 2D measurements. Journal of Sound and Vibration, 285(1-2), 321-339. https://doi.org/10.1016/j.jsv.2004.08.031

Diffusing devices are used to improve room acoustics in a wide variety of applications. The dispersion generated by current diffuser technologies is often limited to mid-to-high frequencies because low-frequency diffusers are usually too large to be... Read More about Active diffusers : some prototypes and 2D measurements.

Room sizing and optimization at low frequencies (2004)
Journal Article
Cox, T., D'Antonio, P., & Avis, M. (2004). Room sizing and optimization at low frequencies. Journal of the Audio Engineering Society, 52(6), 640-651

Modes in small rooms may lead to uneven frequency responses and extended sound decays at low frequencies. In critical listening environments, this often causes unwanted coloration effects, which can be detrimental to the sound quality. Choosing an ap... Read More about Room sizing and optimization at low frequencies.

Improving the bass response of Schroeder diffusers (2003)
Presentation / Conference
Hargreaves, J., & Cox, T. (2003, November). Improving the bass response of Schroeder diffusers. Presented at IOA Soundbite, Oxford

Room acoustic diffusers can be used to treat the acoustics of critical listening environments. A Schroeder diffuser is a popular type of diffuser which has the property of producing grating lobes of similar energy at most integer multiples of the des... Read More about Improving the bass response of Schroeder diffusers.

A neural network for blind identification of speech transmission index (2003)
Journal Article
Li, F., & Cox, T. (2003). A neural network for blind identification of speech transmission index. Proceedings of the ... IEEE International Conference on Acoustics, Speech, and Signal Processing, 2, II-757. https://doi.org/10.1109/ICASSP.2003.1202477

A hybrid neural network model is proposed to determine the speech transmission index of a transmission channel from transmitted speech signals without resort to prior knowledge of original speech. It comprises a Hilbert transform pre-processor, a PCA... Read More about A neural network for blind identification of speech transmission index.

Speech Transmission Index from running speech : a neural network approach (2003)
Journal Article
Li, F., & Cox, T. (2003). Speech Transmission Index from running speech : a neural network approach. ˜The œJournal of the Acoustical Society of America (Online), 113(4), 1999-2008. https://doi.org/10.1121/1.1558373

Speech Transmission Index (STI) is an important objective parameter concerning speech intelligibility for sound transmission channels. It is normally measured with specific test signals to ensure high accuracy and good repeatability. Measurement with... Read More about Speech Transmission Index from running speech : a neural network approach.

Extracting room reverberation time from speech using artificial neural networks (2001)
Journal Article
Cox, T., Li, F., & Darlington, P. (2001). Extracting room reverberation time from speech using artificial neural networks. Journal of the Audio Engineering Society, 49(4), 219-230

A novel method to extract the reverberation time from reverberated speech utterances is presented. In this study, speech utterances are restricted to pronounced digits; uncontrolled discourse is not considered. The reverberation times considered are... Read More about Extracting room reverberation time from speech using artificial neural networks.

Hearing loss in the built environment : the experience of elderly people (2001)
Journal Article
Davies, W., Cox, T., Kearon, A., Longhurst, B., & Webb, C. (2001). Hearing loss in the built environment : the experience of elderly people. Acta acustica united with Acustica, 87(5), 610-616

A qualitative social survey has been conducted on a group of 207 elderly people with a hearing loss. The aim of the study was to determine the extent to which acoustic problems in the built environment affect this subject group. The project was thoug... Read More about Hearing loss in the built environment : the experience of elderly people.