Tyco 579-769 Manual de usuario descargar pdf (Pagina 36)

3-8

Measurement of intelligibility can be complicated, and it sometimes includes subjective analysis.

To effectively implement intelligible systems in real buildings requires that a simple, accurate, and

repeatable method of measuring intelligibility must be available. Fortunately, there are instruments

on the market that meet this need. One of these is the STI-CIS meter available from SimplexGrinnell.

The meter uses the STIpa method to provide a fast and easy measurement of total system speech

intelligibility. It measures both intelligibility and audibility, as it also has a built in dB meter.

The meter automatically converts the STIpa measurement to CIS so that demonstrating that a

system meets the requirements of NFPA 72 is easy and intuitive.

A proprietary test tone is played through the system which the analyzer uses to determine

reduction in speech modulation.

Figure 3-5. STI-CIS Intelligibility Measurement System

Practical Measurement of Intelligibility

Introduction

Microphone

AC Ada

ter

STIpa

Test Tone CD

AC Ada

ter

STI-CIS Analyzer

Talkbox

Volume

Control

Microphone

Holder

CD Player

Speaker

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Tyco 579-769 Manual de usuario Pagina 36