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Sound Waves, Phase and Phase Relationships

Phase

Phase is the time relationship of two or more sound waves at a given point in their cycles.

In-Phase Relationships

Sound waves that are mostly in phase will result in "constructive interference". Constructive interference means that when the sound waves combine the sound gets louder. When sound waves are "in phase" they are creating compressions simultaneously.

Out of Phase Relationships


Sound waves that are mostly out of phase will result in "destructive interference" which causes a decrease in amplitude (the sound gets softer). Here, one sound wave is creating compressions and one is creating rarefactions. When compressions and rarefactions occur simultaneously they cancel each other out and result in sound loss.
Sound Fact: Two identical sound waves that are completely out of phase will cancel each other out and result in a complete absence of sound.

Tutorial 3. Absorption, Reflection, Diffraction, and Diffusion

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Main Menu

Tutorial 1. Sound Waves
An introduction to sound waves

Tutorial 2. Phase Relationships
Explaines what happens when sound waves interact

Tutorial 3. Absorption, Reflection, Diffraction, and Diffusion
The things that can happen when sound encounters an object

Tutorial 4. The Human Ear
A discussion of the different parts that make up the ear. This section also covers hearing loss and prevention.

Tutorial 5. Analog Audio
A discussion about the analog audio format

Tutorial 6. Digital Audio
All about digital audio

Tutorial 7. The Analog to Digital Process
How analog sound waves are converted into digital data.

Tutorial 8 Microphones
A discussion of the three most common professional microphone types. Also information on pick-up patterns.

 

 

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