Download User Guide Version 4 for Windows®

Introduction
SIA-Smaart® Acoustic ToolsTM provides a powerful, cost-effective set of tools for
measuring and analyzing room acoustics and evaluating sound system intelligibility.
The package consists of two program modules; the Intelligibility module and the
Analysis module. The Intelligibility module allows you to measure the impulse
response of a device or room/system and calculate both quanitative acoustical values
for room analysis and objective intelligibility ratings for electro-acoustic systems. The
Analysis module is the a file-based signal analysis program that provides both time
and frequency based displays of wave file data. Both programs work with standard
Windows audio waveform files (also called wave or *.wav files) and are designed
primarily for use with impulse response data.
The SIA-Smaart Intelligibility Module
The Intelligibility module can calculate several objective speech intelligibility indices
and quantitative acoustical values from impulse response data store in Windows
wave files. The Percentage of Articulation Loss of Consonants (%ALCons), Clarity
(early-to-late energy ratio) for some number of milliseconds (e.g., C50, C35, or C7),
and both Speech Transmission Index and Rapid Speech Transmission Index (STI and
RSTI), can all be calculated from the impulse response. The Intelligibility module can
also be used to find delay times and reflections and calculate Early Decay Time
(EDT), Direct to Reverberant level, and RT60 from the same impulse response data.
The program includes its own impulse response recorder that can calculate and
record the impulse response of the system under test using either a Maximum Length
Sequence (MLS) or stimulus-independent dual Fast Fourier Transform (FFT) transfer
function technique. The MLS method requires the use of an internally generated
MLS stimulus signal. The Dual-FFT method can use pink noise or virtually any other
continuous signal (e.g., music) as a stimulus — this is the same technique used in
SIA SmaartLive™ to find delay times. The Intelligibility module provides an internal
pink noise generator for use in dual-FFT measurements however externally generated
signals may be used as well. The Intelligibility module can also be used to analyze
impulse data from any other source as long as the data is stored in, or can be converted to standard Windows wave files.
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