The ICOSSA Project - An improved omnidirectional sound source for room acoustic testing

Conference paper


Hill, A., Gilfillan, D. and Leembruggen, G 2023. The ICOSSA Project - An improved omnidirectional sound source for room acoustic testing. Institute of Acoustics Reproduced Sound. Institute of Acoustics.
AuthorsHill, A., Gilfillan, D. and Leembruggen, G
TypeConference paper
Abstract

One type of loudspeaker that is commonly used for acoustic testing of rooms is the “dodec” which is a twelve-sided enclosure each containing typically a 125 mm driver. This arrangement is intended to produce true omnidirectional radiation for measurement of room acoustic parameters such as strength, clarity and lateral energy. Although this arrangement of drivers works well at low frequencies, it produces significant lobes in the radiation pattern at frequencies above 1.5 kHz. As international standards allow up to 8 dB of variation in polar frequency response, the responses of premium “dodecs” comply with those standards. However, these lobes will produce errors in the 3D impulse responses and the associated acoustic metrics. This paper details the development of an improved transducer topology and an associated signal processing algorithm to produce a significantly more consistent polar frequency response.

Keywordsacoustics; measurement; signal processing; loudspeakers; electroacoustics
Year2023
ConferenceInstitute of Acoustics Reproduced Sound
PublisherInstitute of Acoustics
Web address (URL)https://reproducedsound.co.uk/
Publisher's version
File Access Level
Open
Journal citation45 (4), pp. 1-13
Output statusPublished
Publication dates
Online15 Nov 2023
Publication process dates
Accepted18 Oct 2023
Deposited20 Nov 2023
Permalink -

https://repository.derby.ac.uk/item/q31w4/the-icossa-project-an-improved-omnidirectional-sound-source-for-room-acoustic-testing

Download files


Publisher's version
7. Gilfillan. D.pdf
File access level: Open

  • 8
    total views
  • 25
    total downloads
  • 0
    views this month
  • 3
    downloads this month

Export as

Related outputs

Sound Level Measurement, Monitoring and Management in Small Music Venues: Leq Averaging Time Interval
Mulder, J. and Hill, A. 2024. Sound Level Measurement, Monitoring and Management in Small Music Venues: Leq Averaging Time Interval. AES International Acoustics & Sound Reinforcement Conference. Audio Engineering Society.
A case study on practical live event sound exposure monitoring
Hill, A., Liston, K., Wiggins, I. and Naylor, G. 2024. A case study on practical live event sound exposure monitoring. AES International Acoustics & Sound Reinforcement Conference. Audio Engineering Society.
Signal decorrelation for sound reinforcement system crossovers
Hill, A. 2024. Signal decorrelation for sound reinforcement system crossovers. AES International Acoustics & Sound Reinforcement Conference. Audio Engineering Society.
An investigation into the effect of sweat and moisture on the performance of in-ear monitors
Hill, A., Gilmour, R and Burton, J. 2023. An investigation into the effect of sweat and moisture on the performance of in-ear monitors. Institute of Acoustics Reproduced Sound. Institute of Acoustics.
Towards a subjective quantification of noise annoyance due to outdoor events
Hill, A. and Hourani, C. 2023. Towards a subjective quantification of noise annoyance due to outdoor events. Institute of Acoustics Reproduced Sound. Institute of Acoustics.
The effect of purported acoustically transparent materials on sound propagation
Hill, A., Szoke, Z, Burton, J. and Dring, M. 2023. The effect of purported acoustically transparent materials on sound propagation. Institute of Acoustics Reproduced Sound. Institute of Acoustics.
Inaudibility criteria and alternative methods for controlling music noise levels from late night entertainment
Hill, AJ, Gardner, J. and Hance, G. 2023. Inaudibility criteria and alternative methods for controlling music noise levels from late night entertainment. Institute of Acoustics Reproduced Sound. Institute of Acoustics.
Using cognitive psychology and neuroscience to better inform sound system design at large musical events
Burton, J. and Hill, A. 2022. Using cognitive psychology and neuroscience to better inform sound system design at large musical events. Proceedings of the Institute of Acoustics. 44 (3), pp. 1-8.
The influence of audience participatory noise on sound levels at live events
Hill, A., Kok, M., Burton, J., Mulder, J. and Lawrence, M. 2022. The influence of audience participatory noise on sound levels at live events. Inter-noise. Inter-noise.
Towards the Global Standard for Safe Listening Venues and Events
Hill, A., Mulder, J, Burton, J., Kok,M. and Lawrence, M. 2022. Towards the Global Standard for Safe Listening Venues and Events. 152nd Convention of the Audio Engineering Society. Online May - Jun 2022 Audio Engineering Society.
Sound Level Monitoring at Live Events, Part 3 - Improved Tools and Procedures
Hill, Adam J., Mulder, Johannes, Burton, J., Kok, Marcel and Lawrence, Michael 2022. Sound Level Monitoring at Live Events, Part 3 - Improved Tools and Procedures. Journal of the Audio Engineering Society. 70 (1/2), pp. 73-82. https://doi.org/10.17743/jaes.2021.0049
Sound Level Monitoring at Live Events, Part 2 - Regulations, Practices, and Preferences
Hill, Adam J., Mulder, Johannes, Burton, J., Kok, Marcel and Lawrence, Michael 2022. Sound Level Monitoring at Live Events, Part 2 - Regulations, Practices, and Preferences. Journal of the Audio Engineering Society. 70 (1/2), pp. 62-72. https://doi.org/10.17743/jaes.2021.0042
Sound Level Monitoring at Live Events, Part 1–Live Dynamic Range
Hill, Adam J., Mulder, Johannes, Burton, J., Kok, Marcel and Lawrence, Michael 2021. Sound Level Monitoring at Live Events, Part 1–Live Dynamic Range. Journal of the Audio Engineering Society. 69 (11), pp. 782-792. https://doi.org/10.17743/jaes.2021.0050
Education and Certification in Sound Pressure Level Measurement, Monitoring and Management at Entertainment Events
Mulder, Johannes, Hill, Adam, Burton, J., Kok, Marcel, Lawrence, Michael and Shabalina, Elena 2021. Education and Certification in Sound Pressure Level Measurement, Monitoring and Management at Entertainment Events. Audio Engineering Society.
Understanding and managing sound exposure and noise pollution at outdoor events
Hill, Adam J. 2020. Understanding and managing sound exposure and noise pollution at outdoor events. Audio Engineering Society.
A case study on the impact list event sound level regulations have on sound engineering practice
Hill, Adam J. and Burton, J. 2020. A case study on the impact list event sound level regulations have on sound engineering practice. Institute of Acoustics. https://doi.org/10.25144/13382
Optimizing wide-area sound reproduction using a single subwoofer with dynamic signal decorrelation
Hill, Adam J. and Moore, J.B. 2019. Optimizing wide-area sound reproduction using a single subwoofer with dynamic signal decorrelation. Audio Engineering Society.
A case study on sound level monitoring and management at large-scale music festivals
Hill, Adam J., Kok, Marcel, Mulder, Johannes, Burton, J., Kociper, Alex and Berrios, Anthony 2019. A case study on sound level monitoring and management at large-scale music festivals. Institute of Acoustics.
Investigation into the relationship between standing audience density and absorption.
Hammond, Ross, Hill, Adam J. and Mapp, Peter 2018. Investigation into the relationship between standing audience density and absorption.
Live sound loudspeaker array optimization for consistent directional coverage with diffuse radiation characteristics.
Hill, Adam J. and Hawksford, Malcolm O. J. 2018. Live sound loudspeaker array optimization for consistent directional coverage with diffuse radiation characteristics.
Dynamic diffuse signal processing for sound reinforcement and reproduction.
Moore, Jonathan B. and Hill, Adam J. 2018. Dynamic diffuse signal processing for sound reinforcement and reproduction. Journal of the Audio Engineering Society. https://doi.org/10.17743/jaes.2018.0054
Live sound subwoofer system performance quantification.
Hill, Adam J. 2018. Live sound subwoofer system performance quantification. Audio Engineering Society.
Applications of dynamic diffuse signal processing in sound reinforcement and reproduction.
Moore, Jonathan B. and Hill, Adam J. 2017. Applications of dynamic diffuse signal processing in sound reinforcement and reproduction. Institute of Acoustics.
Efficient acoustic modelling of large acoustic spaces using finite difference methods.
Durbridge, Simon E. and Hill, Adam J. 2017. Efficient acoustic modelling of large acoustic spaces using finite difference methods. Institute of Acoustics.
Practical considerations for subwoofer arrays and clusters in live sound reinforcement.
Hill, Adam J. 2017. Practical considerations for subwoofer arrays and clusters in live sound reinforcement. Audio Engineering Society.
Dynamic diffuse signal processing for low-frequency spatial variance minimization across wide audience areas.
Moore, Jonathan B. and Hill, Adam J. 2017. Dynamic diffuse signal processing for low-frequency spatial variance minimization across wide audience areas. Audio Engineering Society.
Disagreement between STI and STIPA measurements due to high level, discrete reflections
Hammond, Ross, Mapp, Peter and Hill, Adam J. 2017. Disagreement between STI and STIPA measurements due to high level, discrete reflections. Audio Engineering Society.
Optimization of temporally diffuse impulses for decorrelation of multiple discrete loudspeakers
Moore, Jonathan B. and Hill, Adam J. 2017. Optimization of temporally diffuse impulses for decorrelation of multiple discrete loudspeakers. Journal of the Audio Engineering Society.
The effect of performance stages on subwoofer polar and frequency responses
Hill, Adam J. and Paul, Joe 2016. The effect of performance stages on subwoofer polar and frequency responses. Institute of Acoustics.
Defining true propagation patterns of underwater noise produced by stationary vessels
Lusted-Kosolwski, Claire, Piercy, Julius J. B. and Hill, Adam J. 2016. Defining true propagation patterns of underwater noise produced by stationary vessels. Acoustical Society of America.
The influence of discrete arriving reflections on perceived intelligibility and speech transmission index measurements
Hammond, Ross, Mapp, Peter and Hill, Adam J. 2016. The influence of discrete arriving reflections on perceived intelligibility and speech transmission index measurements. Audio Engineering Society.
The influence of discrete arriving reflections on perceived intelligibility and STI measurements
Hammond, Ross, Mapp, Peter and Hill, Adam J. 2016. The influence of discrete arriving reflections on perceived intelligibility and STI measurements. Audio Engineering Society.
Enhanced wide-area low-frequency sound reproduction in cinemas: effective and practical alternatives to current calibration strategies
Hill, Adam J., Hawksford, Malcolm O. J. and Newell, Philip 2016. Enhanced wide-area low-frequency sound reproduction in cinemas: effective and practical alternatives to current calibration strategies. Journal of the Audio Engineering Society. https://doi.org/10.17743/jaes.2016.0012
The good, the bad, and the distant: soundscape cues for larval fish
Piercy, Julius J. B., Smith, David J., Codling, Edward A., Hill, Adam J. and Simpson, Stephen D. 2015. The good, the bad, and the distant: soundscape cues for larval fish. in:
The effects of distortion on the perception of loudness in live sound
Durbridge, Simon E., Hill, Adam J. and Taylor, John 2015. The effects of distortion on the perception of loudness in live sound.
Habitat quality affects sound production and likely distance of detection on coral reefs
Piercy, Julius J. B., Codling, Edward A., Hill, Adam J., Smith, David J. and Simpson, Stephen D. 2014. Habitat quality affects sound production and likely distance of detection on coral reefs. Marine Ecology Progress Series. https://doi.org/10.3354/meps10986
Enhanced wide-area low-frequency sound reproduction in cinemas: Effective and practical alternatives to current sub-optimal calibration strategies
Hill, Adam J., Hawksford, Malcolm O. J. and Newell, Philip 2015. Enhanced wide-area low-frequency sound reproduction in cinemas: Effective and practical alternatives to current sub-optimal calibration strategies.
Getting the most from your subs
Hill, Adam J. 2015. Getting the most from your subs. New Bay.
Subjective evaluation of an emerging theory of low-frequency sound source localization in closed acoustic spaces
Hill, Adam J. and Hawksford, Malcolm O. J. 2014. Subjective evaluation of an emerging theory of low-frequency sound source localization in closed acoustic spaces.
A scientific approach to microphone placement for cymbals in live sound
Harrison, Joshua J. and Hill, Adam J. 2013. A scientific approach to microphone placement for cymbals in live sound. Institute of Acoustics.
Low-frequency sound source localization as a function of closed acoustic spaces
Hill, Adam J. and Hawksford, Malcolm O. J. 2013. Low-frequency sound source localization as a function of closed acoustic spaces. Institute of Acoustics.
On the perceptual advantage of stereo subwoofer systems in live sound reinforcement
Hill, Adam J. and Hawksford, Malcolm O. J. 2013. On the perceptual advantage of stereo subwoofer systems in live sound reinforcement. Audio Engineering Society.
Live event performer tracking for digital console automation using industry-standard wireless microphone systems
Hill, Adam J., Lane, Kit, Rosenthal, Adam P. and Gand, Gary 2013. Live event performer tracking for digital console automation using industry-standard wireless microphone systems. Audio Engineering Society.
Music to our ears: the effect of background music in higher education learning environments
Hill, Adam J. 2013. Music to our ears: the effect of background music in higher education learning environments. Audio Engineering Society.
Towards a generalized theory of low-frequency sound source localization
Hill, Adam J., Lewis, Simon P. and Hawksford, Malcolm O. J. 2012. Towards a generalized theory of low-frequency sound source localization.
Low-frequency temporal accuracy of small-room sound reproduction
Hill, Adam J. and Hawksford, Malcolm O. J. 2012. Low-frequency temporal accuracy of small-room sound reproduction.
Chameleon subwoofer arrays in live sound
Hill, Adam J. and Hawksford, Malcolm O. J. 2011. Chameleon subwoofer arrays in live sound. Acoustics Bulletin.
Visualization and analysis tools for low-frequency propagation in a generalized 3D acoustic space
Hill, Adam J. and Hawksford, Malcolm O. J. 2011. Visualization and analysis tools for low-frequency propagation in a generalized 3D acoustic space. Journal of the Audio Engineering Society.
A hybrid virtual bass system for optimized steady-state and transient performance
Hill, Adam J. and Hawksford, Malcolm O. J. 2010. A hybrid virtual bass system for optimized steady-state and transient performance.
Kick-Drum signal acquisition, isolation and reinforcement optimization in live sound
Hill, Adam J., Hawksford, Malcolm O. J., Rosenthal, Adam P. and Gand, Gary 2011. Kick-Drum signal acquisition, isolation and reinforcement optimization in live sound.
Individualized low-frequency response manipulation for multiple listeners using chameleon subwoofer arrays
Hill, Adam J. and Hawksford, Malcolm O. J. 2011. Individualized low-frequency response manipulation for multiple listeners using chameleon subwoofer arrays. in: IEEE.
Practical applications of chameleon subwoofer arrays
Hill, Adam J. and Hawksford, Malcolm O. J. 2012. Practical applications of chameleon subwoofer arrays.
Wide-area psychoacoustic correction for problematic room-modes using nonlinear bass synthesis
Hill, Adam J. and Hawksford, Malcolm O. J. 2011. Wide-area psychoacoustic correction for problematic room-modes using nonlinear bass synthesis. Journal of the Audio Engineering Society.
Analysis, modeling and wide-area spatiotemporal control of low-frequency sound reproduction
Hill, Adam J. 2012. Analysis, modeling and wide-area spatiotemporal control of low-frequency sound reproduction. PhD Thesis