All Outputs (71)

A transient boundary element method for acoustic scattering from mixed regular and thin rigid bodies (2009)
Journal Article
Hargreaves, J., & Cox, T. (2009). A transient boundary element method for acoustic scattering from mixed regular and thin rigid bodies. Acta acustica united with Acustica, 95(4), 678-689. https://doi.org/10.3813/AAA.918196

Boundary Element Methods (BEMs) may be used to predict the scattering of sound by obstacles, which has accelerated the prototyping of new room acoustic treatments such as diffusers. Unlike the more popular frequency domain method, the time domain BE... Read More about A transient boundary element method for acoustic scattering from mixed regular and thin rigid bodies.

A transient boundary element method model of Schroeder diffuser scattering using well mouth impedance (2008)
Journal Article
Hargreaves, J., & Cox, T. (2008). A transient boundary element method model of Schroeder diffuser scattering using well mouth impedance. ˜The œJournal of the Acoustical Society of America (Online), 124(5), 2942-2951. https://doi.org/10.1121/1.2982420

Room acoustic diffusers can be used to treat critical listening environments to improve sound quality. One popular class is Schroeder diffusers, which comprise wells of varying depth separated by thin fins. This paper concerns a new approach to ena... Read More about A transient boundary element method model of Schroeder diffuser scattering using well mouth impedance.

Monaural room acoustic parameters from music and speech (2008)
Journal Article
Kendrick, P., Cox, T., Li, F., Zhang, Y., & Chambers, J. (2008). Monaural room acoustic parameters from music and speech. ˜The œJournal of the Acoustical Society of America (Online), 124(1), 278-287. https://doi.org/10.1121/1.2931960

This paper compares two methods for extracting room acoustic parameters from reverberated speech and music. An approach which uses statistical machine learning, previously developed for speech, is extended to work with music. For speech, reverberatio... Read More about Monaural room acoustic parameters from music and speech.

Lüke and power residue sequence diffusers (2008)
Journal Article
Dadiotis, K., Angus, J., & Cox, T. (2008). Lüke and power residue sequence diffusers. ˜The œJournal of the Acoustical Society of America (Online), 123(4), 2035-2042. https://doi.org/10.1121/1.2885761

Conventional Schroeder diffusers have been successfully used for many years. However, their frequency range is limited by the flat plate effect that occurs when all the wells radiate in phase. This occurs at harmonics of p times the design frequency... Read More about Lüke and power residue sequence diffusers.

A combined blind source separation and adaptive noise cancellation scheme with potential application in blind acoustic parameter extraction (2008)
Journal Article
Zhang, Y., Chambers, J., Kendrick, P., Cox, T., & Li, F. (2008). A combined blind source separation and adaptive noise cancellation scheme with potential application in blind acoustic parameter extraction. Neurocomputing, 71(10-12), 2127-2139. https://doi.org/10.1016/j.neucom.2007.09.019

Room acoustic parameters such as reverberation time (RT) can be extracted from passively received speech signals by certain ‘blind’ methods, thereby mitigating the need for good controlled excitation signals or prior information of the room geometry.... Read More about A combined blind source separation and adaptive noise cancellation scheme with potential application in blind acoustic parameter extraction.

The photo‐survey research method : capturing life in the city (2008)
Journal Article
Moore, G., Croxford, B., Adams, M., Refaee, M., Cox, T., & Sharples, S. (2008). The photo‐survey research method : capturing life in the city. Visual Studies, 23(1), 50-62. https://doi.org/10.1080/14725860801908536

Recent promotion of city centre living within UK policy has led to a commensurate interest in city centre conditions and the opinions and experiences of the people who live there. An apposite, straightforward method to capture city centre residents'... Read More about The photo‐survey research method : capturing life in the city.

Blind estimation of reverberation parameters for non-diffuse rooms (2007)
Journal Article
Kendrick, P., Li, F., Cox, T., Zhang, Y., & Chambers, J. (2007). Blind estimation of reverberation parameters for non-diffuse rooms. Acta acustica united with Acustica, 93(5), 760-770

Reverberation time is an important objective parameter for the acoustics of enclosed spaces. Blind estimation of the reverberation time from naturally occurring sound sources alleviates the logistical constraints of traditional measurement methods, a... Read More about Blind estimation of reverberation parameters for non-diffuse rooms.

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..

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.

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.

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.

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.