Distributed loudspeaker array measurement and correction techniques
Distributed loudspeaker array measurement and correction techniques
It has been common practice in cinema calibration (and some other areas of audio) to use a distributed-source loudspeaker-array for the ambient sound-field reproduction. As a part of the cinema loudspeaker-alignment process, systems engineers have been required to analyse and equalise these arrays to a recommended target response by means of the averaging of between four and eight microphones distributed within the calibration area. Ostensibly, this procedure would make the array subjectively match the sound of an individual screen-channel that had been calibrated to the same response, but the evidence that this would actually be the case was, at best, tenuous. Other experts had argued that more-compatible results could be achieved if the individual loudspeakers in the arrays were timbrally matched to the screen channel. This paper presents evidence of the finer details and pitfalls encountered when attempting to analyse a complex soundfield created by what is often more than five individual distributed sources, and whether such analysis for the purpose of system correction is even possible.
loudspeaker arrays, cinema, calibration
Newell, Julius
7b403c2a-65bf-48d4-a8dd-c7bc284286df
Holland, Keith
90dd842b-e3c8-45bb-865e-3e7da77ec703
Newell, Philip
37056bad-d36e-4270-acf6-c0d2b736271a
November 2017
Newell, Julius
7b403c2a-65bf-48d4-a8dd-c7bc284286df
Holland, Keith
90dd842b-e3c8-45bb-865e-3e7da77ec703
Newell, Philip
37056bad-d36e-4270-acf6-c0d2b736271a
Newell, Julius, Holland, Keith and Newell, Philip
(2017)
Distributed loudspeaker array measurement and correction techniques.
In Reproduced Sound 2017: Sound Quality by Design.
vol. 39 Pt1
Record type:
Conference or Workshop Item
(Paper)
Abstract
It has been common practice in cinema calibration (and some other areas of audio) to use a distributed-source loudspeaker-array for the ambient sound-field reproduction. As a part of the cinema loudspeaker-alignment process, systems engineers have been required to analyse and equalise these arrays to a recommended target response by means of the averaging of between four and eight microphones distributed within the calibration area. Ostensibly, this procedure would make the array subjectively match the sound of an individual screen-channel that had been calibrated to the same response, but the evidence that this would actually be the case was, at best, tenuous. Other experts had argued that more-compatible results could be achieved if the individual loudspeakers in the arrays were timbrally matched to the screen channel. This paper presents evidence of the finer details and pitfalls encountered when attempting to analyse a complex soundfield created by what is often more than five individual distributed sources, and whether such analysis for the purpose of system correction is even possible.
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Published date: November 2017
Venue - Dates:
Reproduced Sound 2017: SOUND QUALITY BY DESIGN, , Nottingham, United Kingdom, 2017-11-21 - 2017-11-23
Keywords:
loudspeaker arrays, cinema, calibration
Identifiers
Local EPrints ID: 426128
URI: http://eprints.soton.ac.uk/id/eprint/426128
PURE UUID: a351b4a6-745c-4646-a4b2-5b6f572c4173
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Date deposited: 15 Nov 2018 17:30
Last modified: 15 Mar 2024 22:45
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Contributors
Author:
Julius Newell
Author:
Keith Holland
Author:
Philip Newell
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