Delnoise explains in detail how noise barriers work, how our noise barriers block and eliminate unwanted noise. Before knowing how the noise barrier works. We should know the following points:

• What is a Sound wave & how does it travel?
• How is sound measured?
• What is high pitch and low pitch sound?
• How do you define louder and quitter sound?

What is a sound wave & how does it travel?

A sound wave is a form of energy that causes a pattern of disturbance/vibrations (compression & rarefaction) in the molecules, when travelling through air water or any other form of liquid or solid.

A sound wave travel by compression and rarefaction of the molecules in the air, water or any other form of liquid or solid. Where else one complete cycle compression to compression is called as one wave length.

How is sound measured?

Sound is measured in Hz (Hertz) and dB(decibel),

• Hz (Hertz) are defined as an unaltered sound wave which follows a particular frequency.
• dB (decibel) is defined as an altered sound waves due to the surrounding environment and it doesn’t follow a particular frequency as Hz.

So, the sound what we hear in our day today life is measured in dB (decibel), where else the Hz (Hertz) are used to measure the frequency of the sound in acoustics labs and experiments.

What is a high pitch and low pitch sound?

When the disturbance/ vibrations are fast, it is called as high pitch and when it is slow it is called as low pitch sound. In other technical terms, shorter the wave length it is called as high pith, longer the wave length it is called as low pitch.

Low pitch = Low Frequency
High Pitch = High Frequency

How do you define a louder and quitter sound?

When the amplitude of the sound wave is small, it is called as quitter and when the amplitude is large, it is called as louder.

How do Noise Barriers Work

The noise barrier work by three fundamental/basic principles of blocking the sound waves

• Absorption
• Reflection
• Diffusion

Reflection

When the sound waves generated from the source meet the barrier, the waves are redirected or bounced back to the source where the sound is generated.

Absorption

When the sound waves generated from the source meet the barrier, the most of the sound waves gets absorbed by the barrier.

Diffusion

When the sound waves generated from the source meet the barrier, the sound waves are scattered or diffracted by the barrier.

So, noise barriers work by blocking the direct path of sound waves from the source to the receiver. By Reflection, Absorption and diffusion of the sound waves.