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Soft dB OBSI Software (On Board Sound Intensity)


The SoftdB OBSI Software is the first turn-key solution for the measurement of On-Board Sound Intensity (OBSI) Method (AASHTO Designation: TP76-10). This software is used both for real-time acquisition and processing, and post-processing of recorded files. Primarily intended for the Conductor platform, the OBSI software can be used with the Alto6-i USB analyser connected to a PC.

The OBSI method is a technique to measure tire-pavement noise using two phase matched microphones placed in a side-by-side configuration. The microphones are attached to the hub of a wheel using a special fixture with one microphone located in the leading edge of the tire while the other microphone is placed near the trailing edge. This technique uses a reference tire according to ASTM F2493.


  • Versatile Customizable Interface
  • Time History, 1/3 Octave Spectrum, FFT Spectrum, Numerical Display
  • Extensive Data Processing
  • Intensity, Pressure, PI Index, Coherence, Vehicle Speed, Travel Distance
  • 1 or 2 Sound-Intensity Probe Configurations (Leading and/or Trailing Edge Probe
  • Tachometer Input
  • Real-Time and Post-Processing Audio Feedback


 Download OBSI Spec Sheet 

 Download OBSI User Guide




Special Test Systems

Norsonic Systems
Acoustic Camera
Airflow Resistance
Rion Systems
BSWA Systems
Intensity Probe
Impedance Tubes
Soft dB System
OBSI Software