1. Introduction

The aim of this virtual lab is to examine the suitability of different sound level parameters for different

noise events. This will be achieved by calculating the variability in LAeq and LN for several types of sounds

corresponding to traffic noise and other anthropogenic sounds.

2. Tasks

Task 1

Create an x-y plot showing (i) the instantaneous sound pressure level in dB(A), (ii) LAeq, (iii) LA10 and (iv)

LA90 from the traffic noise recording over a sampling period of 3 minutes. See Figure 1 for an example.

Examine the quantitative data and provide a brief description (no more than 300 words) describing the

types of sounds that have influenced LAeq, LA10 and LA90.

Figure 1 Time history of a sound pressure level

To complete Task 1, you will need to follow the steps below:

1) Download the “Decibel X” free sound level meter app on your smartphone. This is available on both

iOS and Android.

Figure 2 Decibel X sound level meter app