# Sound Measurement Report

Essay by Barryca90University, Bachelor'sA+, October 2014

AUD100

AUD100.1 Sound Measurement Report

Scenario:

Wendy and Eric stand 10 meters apart, on a perfectly flat and reflective surface.

There are no other reflective surfaces around.

Wendy and Eric are exactly the same height (1.6 meters).

The pressure measured one meter from Wendy (on the line between Wendy and Eric)

during conversation is 0.05Pa.

Wendy Eric

| | Direct Sound Wave 10m

1.6m 1.6m

10 Meters

Figure 1. Detailed diagram that outlines the scenario between Wendy and Eric. Diagram includes direct and reflected sound paths, height of Wendy and Eric, pressure measured from Wendy to Eric (one meter) and perfectly flat and reflective surface.

In this scenario, there are two people named Wendy and Eric, who are exactly the same height of

1.6 meters, standing on a perfectly flat and reflective surface. There are no other reflective surfaces

around. The pressure measured one meter from Wendy is 0.05Pa.

Sound pressure is the local pressure departing from the ambient atmospheric pressure, caused by a

sound wave. In air, sound pressure can be measured using a microphone, and in water with a

hydrophone. Wendy and Eric are on land, so the pressure measured one meter from Wendy towards

Eric would have been measured with a microphone.

Once measuring the pressure of a sound wave, a simple formula can be done to calculate the sound

pressure level (SPL) of a wave. This can be done without the use of any microphones or measuring

devices.

Although there is no such thing as a perfectly flat and reflective surface, for the sake of this scenario

Wendy and Eric are standing on one. Being stood on a perfectly flat and reflective surface, they are

going to encounter comb filtering. Comb filtering occurs when sound arrives from two identical

sources that are mixed together, and one...