Committees responsible
Foreword
Code of practice
1 General
2 Application
3 Guidance for prospective purchasers
4 Planning and contract management of the system
5 Recommended design principles and procedures
6 Installing the system
7 Commissioning the system
8 Operation and maintenance of the system
9 Equipment
10 Special considerations for sound systems for
      emergency purposes
Annexes
A (informative) Example of a plan of work for Project
      Team operation suitable for large projects
B (informative) Project checklist
C (informative) Design checklist
D (informative) Basic concepts for electronics and
      acoustics
E (informative) Consultants for sound systems
F (informative) Example of sound system operating
      instructions for a Scottish court
G (informative) Basic list of characteristics which
      should be included in loudspeaker specifications,
      and references to the relevant methods of measure-
      ment
H (informative) List of characteristics recommended
      to be specified in contracts for headphones and
      headsets, and the relevant methods of measurement
J (informative) Basic list of characteristics
      recommended to be specified for amplifiers, and the
      relevant methods of measurement
K (informative) Attenuators for microphones
L (informative) Bibliography
Tables
1 Basic recommendations for sound system applications
2 Expected sound levels
3 Maximum sound pressure levels for Dolby formats
A.1 Plan of work
A.2 Stage A: Inception
A.3 Stage B: Feasibility
A.4 Stage C: Outline proposals
A.5 Stage D: Scheme design
A.6 Stage E: Detail design
A.7 Stage F: Bills of quantity
A.8 Stage G; Project plan
A.9 Stage H: Operation on site
A.10 Stage I: Completion
B.1 Project checklist for sound system installation
Figures
1 Block diagram of an extensive sound system for a
      large store
2 Block diagram of a sound system for a large church
3 Examples of sound system output levels
4 Empirical rule for estimating pairs of audio band
      limit frequencies which give subjectively balanced
      reproduction of programme signals
5 Sound from film maximum sound pressure levels,
      types A, SR and SR.D
6 Diagram showing the floating-return technique for
      disabling local loudspeaker attenuators in an
      emergency
7 Horizontal directional response of an omnidirectional
      microphone with its axis vertical: decibel scale
8 Directional response of a cardioid microphone:
      decibel scale
9 Directional response of a hypercardioid microphone:
      decibel scale
10 Directional response of a supercardioid microphone
      decibel scale
11 Directional response of a highly directional shotgun
      (rifle) microphone where f = 2.5 Hz and barrel
      length is 275 mm
12 Directional response of a highly directional
      shotgun (rifle) microphone where f = 10 kHz and
      barrel length is 275 mm
13 Directional response of a highly directional shot-
      gun (rifle) microphone where f = 10 kHz and barrel
      length is 275 mm
14 Relative operating distances of microphones for equal
      direct-reverberent signal ratios
15 Two methods for positioning microphones on a
      conference table. The top view observes the 3 to 1
      rule using cardioid microphones. The bottom view
      shows alternative placement using two omni-
      directional microphones
16 The 3-to-1 ratio for microphone positioning
17 A reduced distance ratio using angled microphones
18 Illustrations of 'good' and 'bad' microphone
      placement
19 Optimization of the height of the microphone above
      the table
D.1 Distortion characteristics of a typical amplifier
D.2 Reflection diagram for certain positions of sound
      source and receiver in a rectangular room of 40m x
      25m x 8m
D.3 Level recorder trace of sound decay in a room
D.4 Reverberation time measurement
K.1 Basic-L-type microphone attenuator
K.2 Attenuator configuration
Index
List of references