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Acoustics
In the field of acoustics engineering IGB offers the following services:
Measurement and Surveys
Electrical and acoustical measurements for basic evaluations, surveys and measurements:
Room Acoustics
Reverberation time, STI, RASTI, AIcons, C50, C80, all parameters specified in IS0 3382.
Electroacoustics
Sound Pressure Level, Frequency Characteristics, Decay time, STI, RASTI.
Audio/Visual
Signal to Noise Ratio, Total Harmonic Distortion & Noise Crosstalk.
Figure 1: Start-up screen for selecting a measuring feature
Figure 2: Post processing window
Figure 3: Real-time analyser with spectrograph
Figure 4: Sound Level Meter
Planning and Analysis of Lighting Systems
Planning and analysis of room lighting and illumination systems, for indoor and outdoor which include the following deliverables:
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Figure 5: Simulation of Light Intensity Distribution for a Conference Hall
Figure 6: Distribution of Light Density for a Particular Lamp
Planning
Planning for room acoustics, sound system, audio/visual, communication and data systems includes the following deliverables:
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This includes the preparation of tender document according to the international or local standards. Our services include also evaluation of proposals which includes technical analysis of the performance to ensure the fulfilment of specifications.
Building Supervision
This includes building inspection and supervision as per the following performance measurements:
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Public Address and Voice Alarm
IGB provides a diverse and comprehensive service to the audio communication industry, specifically in the area of Public Address (PA) and Voice Alarm (VA).
Through investigation and analysis, both in the field and utilising PC-based modelling tools, IGB can assist in the specification of a voice alarm system in accordance with the relevant standards.
IGB will apply professional, modern techniques to ensure that an installation will perform the task required and will meet specific requirements by taking into account how the system will be used. The design of such a system takes place in two stages.
Stage one in the design of a sound system examines the architecture in which the system will live. IGB can predict and measure reverberation time in order to identify the constraints of the design. Wherever necessary, additional absorption can be specified to reduce the reverberation time to an acceptable length for the purposes of the sound system design.
Stage two utilises PC-based modelling techniques to provide a system layout. Using the model, loudspeaker placement and tapping can be readily altered allowing direct comparison of a number of potential schemes. The model also allows various room acoustic parameters to be predicted. Such parameters include coverage, sound pressure level and Room Acoustics Speech Transmission Index (RASTI).
IGB has a full compliment of measurement and analysis equipment which can be used to assess parameters such as sound pressure levels and perform RASTI testing of existing systems already installed. IGB is also able to offer a comprehensive commissioning service where a number of parameters are measured in accordance with a performance specification.
IGB also offers a cost effective Design Verification Service where existing loudspeaker layout designs can be independently verified for compliance with standards and specifications.
Figure 7: Public Address System Structure