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Prof Trevor Cox's Outputs (149)

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.

Response to "comment on 'reducing seat dip attenuation'" J. Acoust. Soc. Am. 110, 1260 (2001) (2001)
Journal Article
Davies, W., & Cox, T. (2001). Response to "comment on 'reducing seat dip attenuation'" J. Acoust. Soc. Am. 110, 1260 (2001). ˜The œJournal of the Acoustical Society of America (Online), 110(3), 1261-1262

This letter responds to Klepper's comments [J. Acoust. Soc. Am. 110, 1260 (2001)] on the subject paper, which is concerned with ameliorating seat dip attenuation in auditoria by introducing a pit under the seats. Klepper asks what the effect of the p... Read More about Response to "comment on 'reducing seat dip attenuation'" J. Acoust. Soc. Am. 110, 1260 (2001).

From a profiled diffuser to an optimized absorber (2000)
Journal Article
Wu, T., Cox, T., & Lam, Y. (2000). From a profiled diffuser to an optimized absorber. ˜The œJournal of the Acoustical Society of America (Online), 108(2), 643-650. https://doi.org/10.1121/1.429596

The quadratic residue diffuser was originally designed for enhanced scattering. Subsequently, however, it has been found that these diffusers can also be designed to produce exceptional absorption. This paper looks into the absorption mechanism of th... Read More about From a profiled diffuser to an optimized absorber.

Surface diffusion coefficients for room acoustics : free-field measures (2000)
Journal Article
Hargreaves, T., Cox, T., Lam, Y., & D'Antonio, P. (2000). Surface diffusion coefficients for room acoustics : free-field measures. https://doi.org/10.1121/1.1310192

A surface diffusion coefficient is needed in room acoustics to enable the quality of diffusing surfaces to be evaluated. It may also facilitate more accurate geometric room acoustic models. This paper concentrates on diffusion coefficients derived fr... Read More about Surface diffusion coefficients for room acoustics : free-field measures.

Reducing seat dip attenuation (2000)
Journal Article
Davies, W., & Cox, T. (2000). Reducing seat dip attenuation. ˜The œJournal of the Acoustical Society of America (Online), 108(5), 2211-2218

Strategies fur reducing seat dip attenuation in concert halls are considered. It is shown that the dip is established 4 ms after the direct sound from the stage arrives at the listener. Sound scattered from the seats and floor is the main cause of th... Read More about Reducing seat dip attenuation.

The optimization of profiled diffusers (1995)
Journal Article
Cox, T. (1995). The optimization of profiled diffusers. ˜The œJournal of the Acoustical Society of America (Online), 97(5), 2928-2936. https://doi.org/10.1121/1.412972

Methods have been developed to produce profiled diffusers that create a large amount of diffusion. The methods are iterative and required the development of a new parameter to measure diffusion. Achieving scattering independent of angle has been atte... Read More about The optimization of profiled diffusers.

The sensitivity of listeners to early sound field changes in auditoriums (1993)
Journal Article
Cox, T., Davies, W., & Lam, Y. (1993). The sensitivity of listeners to early sound field changes in auditoriums. Acta acustica united with Acustica, 79(1), 27-41

The sensitivity of listeners to small changes in the early sound field of auditoria has been measured. This was done using a realistic artificial simulation system of a concert ball sound field. The simulation system was designed so that standard obj... Read More about The sensitivity of listeners to early sound field changes in auditoriums.

Objective and subjective evaluation of reflecting and diffusing surfaces in auditoria (1992)
Thesis
Cox, T. Objective and subjective evaluation of reflecting and diffusing surfaces in auditoria. (Thesis). University of Salford

The performance of reflectors and diffusers used in auditoria have been
evaluated both objectively and subjectively.
Two accurate systems have been developed to measure the scattering
from surfaces via the cross correlation function. These have be... Read More about Objective and subjective evaluation of reflecting and diffusing surfaces in auditoria.

Acoustic room modelling using a spherical camera for reverberant spatial audio objects
Presentation / Conference
Hansung, K., Hughes, R., Remaggi, L., Jackson, P., Hilton, A., Cox, T., & Shirley, B. Acoustic room modelling using a spherical camera for reverberant spatial audio objects. Poster presented at 142nd AES Convention, Berlin, Germany

The ability to predict the acoustics of a room without acoustical measurements is a useful capability. The motivation here stems from spatial audio reproduction, where knowledge of the acoustics of a space could allow for more accurate reproduction o... Read More about Acoustic room modelling using a spherical camera for reverberant spatial audio objects.

Continuous evaluative and pupil dilation response to soundscapes
Presentation / Conference
Graetzer, S., Landowska, A., Harris, L., Cox, T., & Davies, W. Continuous evaluative and pupil dilation response to soundscapes. Presented at e-Forum Acusticum 2020, Online

We investigated human response to soundscapes using a continuous second-by-second rating of soundscapes and a more conventional overall rating of each sample at the end of each audition. In this work, our primary aim was to explore what continuous ra... Read More about Continuous evaluative and pupil dilation response to soundscapes.

Automatic detection of microphone wind noise : maximising accuracy of amplitude modulation ratings
Presentation / Conference
von Hünerbein, S., Cox, T., Kendrick, P., & Bradley, S. Automatic detection of microphone wind noise : maximising accuracy of amplitude modulation ratings. Presented at Wind Turbine Sound 2016, Gdansk, Poland

Microphone wind noise can corrupt outdoor measurements and recordings. It is a particular problem for wind turbine measurements because these cannot be carried out when the wind speed is low. Wind shields can be used, but often the sound level from t... Read More about Automatic detection of microphone wind noise : maximising accuracy of amplitude modulation ratings.

Using blind signal processing algorithms to remove wind noise from environmental noise assessments : a wind turbine amplitude modulation case study
Journal Article
Kendrick, P., von Hünerbein, S., & Cox, T. Using blind signal processing algorithms to remove wind noise from environmental noise assessments : a wind turbine amplitude modulation case study. ˜The œJournal of the Acoustical Society of America (Online), 138(3), 1731-1732. https://doi.org/10.1121/1.4933451

Microphone
wind noise can corrupt outdoor measurements and recordings. It is a particular problem for wind turbine
measurements because these cannot be carried out when the wind speed is low. Wind shields can be used, but often the sound level from... Read More about Using blind signal processing algorithms to remove wind noise from environmental noise assessments : a wind turbine amplitude modulation case study.

Measuring a portable audio device’s response to excessive sound levels
Report
Kendrick, P., Cox, T., Fazenda, B., & Jackson, I. Measuring a portable audio device’s response to excessive sound levels

This is a report detailing how a series of measurements were carried out to quantify the non-linear performance of a series of portable audio recorders. The performance of a series of common devices is quantified including the; Cannon 550D, Edirol r... Read More about Measuring a portable audio device’s response to excessive sound levels.