Construction Today - September 2016 - 87

IN THIS SECTION
Stuart Olson
speaker, but it is limited to a few large steps. Furthermore, each zone
only offers a global frequency control.
Because the sound cannot be finely adjusted in local areas, centralized specifications allow a wide tolerance-even as much as ±2
A-weighted decibels, giving an overall range of 4 decibels across the
space. One can usually expect a 10 percent reduction in performance
for each decibel below the target masking volume. Therefore, such a
broad tolerance can lead to a 40 percent performance loss in unpredictable locations across the facility.

Jp.98
The Edson Healthcare
Centre in Alberta will
improve quality of care.

Company Profiles
88

Decentralized Architecture
In the mid-1970s, engineers developed decentralized architecture in
order to address the tuning obstacles posed by large zones.
In this configuration, the electronics used for sound generation,
volume and contour control are integrated into 'master' loudspeakers. Each master is connected to up to two 'satellite' loudspeakers,
which repeat their settings. Therefore, a decentralized system's zones
are only one to three loudspeakers in size (i.e. 225 to 675 square feet
or 30 to 62 square meters). Each zone offers fine volume control, allowing local variations to be addressed and, hence, a more consistent
masking level to be achieved across the facility.
However, frequency adjustment is limited. Furthermore, the
technician has to make changes directly at each master. It is advisable
to modify masking settings when changes are made to the interior or
to occupancy. It is almost certain that these changes will occur during
a system's lifespan. Therefore, engineers needed to develop a more
practical way of adjusting the sound.

Networked Architecture
The first networked sound masking system was introduced in the
early 2000s. This technology leverages the benefits of decentralized
electronics, but components are addressable in order to provide full
control over all settings from a central control panel and/or software.
Adjustments can easily be made, maintaining peak performance over
the system's lifecycle.
When designed with small zones of one to three loudspeakers
offering fine volume (i.e. 0.5 decibels) and frequency (i.e. 1/3 octave)
control, networked architecture can provide consistency in the
overall masking volume not exceeding ±0.5 decibels (i.e. 1 decibel
overall), yielding much better results than previous architectures.
Some networked systems are tuned using a computer, which rapidly
adjusts the sound to the specified curve.
Zoning is also handled digitally rather than hardwired. Furthermore, networked designs can offer functions such as on-demand paging, 24-hour monitoring, email notification, programmable in-room
controls and integration with other building control systems.

T.A. Loving - Vidant Cancer
Center
90 Hunt Construction - Houston
Methodist Hospital
92 Miron Co.
94 J&J Contractors
96 Sinanian Development Inc. - El
Camino College Athletic
Education and Fitness Complex
98 Stuart Olson - Edson Healthcare
Centre
101 Turner Construction - University
of Kansas Earth, Energy and
Environment Center (EEEC)

Hybrid Architecture
Vendors have also tried combining architectures - for example, by providing individual
zones for closed rooms and large zones across
open plans. However, as noted above, centralized architecture is unable to adjust for acoustical variations across the floor plate, which can
be considerable, even within an open plan.
In the end, variations can significantly impact speech privacy, noise control and occupant
comfort. It is vital for the masking sound to be
delivered within the highest degree of precision
possible. While being able to properly categorize a sound masking technology as centralized,
decentralized or networked will not tell you
everything it can or cannot do, its architecture
provides the foundation for its performance.

Niklas Moeller is vice president of K.R. Moeller Associates Ltd., manufacturer of the LogiSon Acoustic Network (logison.com). He can be reached
at nmoeller@logison.com.

87

SEPTEMBER 2016 CONSTRUCTION-TODAY.COM


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Table of Contents for the Digital Edition of Construction Today - September 2016

Contents
Construction Today - September 2016 - Cover1
Construction Today - September 2016 - Cover2
Construction Today - September 2016 - 1
Construction Today - September 2016 - Contents
Construction Today - September 2016 - 3
Construction Today - September 2016 - 4
Construction Today - September 2016 - 5
Construction Today - September 2016 - 6
Construction Today - September 2016 - 7
Construction Today - September 2016 - 8
Construction Today - September 2016 - 9
Construction Today - September 2016 - 10
Construction Today - September 2016 - 11
Construction Today - September 2016 - 12
Construction Today - September 2016 - 13
Construction Today - September 2016 - 14
Construction Today - September 2016 - 15
Construction Today - September 2016 - 16
Construction Today - September 2016 - 17
Construction Today - September 2016 - 18
Construction Today - September 2016 - 19
Construction Today - September 2016 - 20
Construction Today - September 2016 - 21
Construction Today - September 2016 - 22
Construction Today - September 2016 - 23
Construction Today - September 2016 - 24
Construction Today - September 2016 - 25
Construction Today - September 2016 - 26
Construction Today - September 2016 - 27
Construction Today - September 2016 - 28
Construction Today - September 2016 - 29
Construction Today - September 2016 - 30
Construction Today - September 2016 - 31
Construction Today - September 2016 - 32
Construction Today - September 2016 - 33
Construction Today - September 2016 - 34
Construction Today - September 2016 - 35
Construction Today - September 2016 - 36
Construction Today - September 2016 - 37
Construction Today - September 2016 - 38
Construction Today - September 2016 - 39
Construction Today - September 2016 - 40
Construction Today - September 2016 - 41
Construction Today - September 2016 - 42
Construction Today - September 2016 - 43
Construction Today - September 2016 - 44
Construction Today - September 2016 - 45
Construction Today - September 2016 - 46
Construction Today - September 2016 - 47
Construction Today - September 2016 - 48
Construction Today - September 2016 - 49
Construction Today - September 2016 - 50
Construction Today - September 2016 - 51
Construction Today - September 2016 - 52
Construction Today - September 2016 - 53
Construction Today - September 2016 - 54
Construction Today - September 2016 - 55
Construction Today - September 2016 - 56
Construction Today - September 2016 - 57
Construction Today - September 2016 - 58
Construction Today - September 2016 - 59
Construction Today - September 2016 - 60
Construction Today - September 2016 - 61
Construction Today - September 2016 - 62
Construction Today - September 2016 - 63
Construction Today - September 2016 - 64
Construction Today - September 2016 - 65
Construction Today - September 2016 - 66
Construction Today - September 2016 - 67
Construction Today - September 2016 - 68
Construction Today - September 2016 - 69
Construction Today - September 2016 - 70
Construction Today - September 2016 - 71
Construction Today - September 2016 - 72
Construction Today - September 2016 - 73
Construction Today - September 2016 - 74
Construction Today - September 2016 - 75
Construction Today - September 2016 - 76
Construction Today - September 2016 - 77
Construction Today - September 2016 - 78
Construction Today - September 2016 - 79
Construction Today - September 2016 - 80
Construction Today - September 2016 - 81
Construction Today - September 2016 - 82
Construction Today - September 2016 - 83
Construction Today - September 2016 - 84
Construction Today - September 2016 - 85
Construction Today - September 2016 - 86
Construction Today - September 2016 - 87
Construction Today - September 2016 - 88
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Construction Today - September 2016 - 90
Construction Today - September 2016 - 91
Construction Today - September 2016 - 92
Construction Today - September 2016 - 93
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Construction Today - September 2016 - 95
Construction Today - September 2016 - 96
Construction Today - September 2016 - 97
Construction Today - September 2016 - 98
Construction Today - September 2016 - 99
Construction Today - September 2016 - 100
Construction Today - September 2016 - 101
Construction Today - September 2016 - 102
Construction Today - September 2016 - 103
Construction Today - September 2016 - 104
Construction Today - September 2016 - 105
Construction Today - September 2016 - 106
Construction Today - September 2016 - 107
Construction Today - September 2016 - 108
Construction Today - September 2016 - 109
Construction Today - September 2016 - 110
Construction Today - September 2016 - 111
Construction Today - September 2016 - 112
Construction Today - September 2016 - 113
Construction Today - September 2016 - 114
Construction Today - September 2016 - 115
Construction Today - September 2016 - 116
Construction Today - September 2016 - 117
Construction Today - September 2016 - 118
Construction Today - September 2016 - 119
Construction Today - September 2016 - 120
Construction Today - September 2016 - 121
Construction Today - September 2016 - 122
Construction Today - September 2016 - 123
Construction Today - September 2016 - 124
Construction Today - September 2016 - 125
Construction Today - September 2016 - 126
Construction Today - September 2016 - 127
Construction Today - September 2016 - 128
Construction Today - September 2016 - Cover3
Construction Today - September 2016 - Cover4
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