Soft dB OBSI Software User Guide - Manual (Page 5)

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1 Introduction
Congratulations on your purchase of the OBSI Module.
The OBSI Module is a powerful tool to perform tire-pavement noise according to AASHTO TP 76-10
standard method. This software combines the measurement and post-processing tools to produce
high quality results.
The OBSI Module is intended to run on an I-Track System, but can also be used with an Alto-6 using
a stand alone computer. The software can also be installed on a stand alone computer to use the
post-processing tools.
General Specifications
Measurement Types
• Sound Intensity
• Sound Pressure
• Coherence
• PI Index
• Audio signals
• Vehicle speed
• Vehicle traveled distance
Display Types
• 1/3 Octave band
• FFT
• Time History
• Numerical indicators