Lesson 1: Audio Theories
Audio 101
What is Sound? |
Sound is a mechanical wave transmitted by variations in pressure, transmitted through some medium. It is composed of frequencies within the range of hearing.
It can be described by what we can measure or by what we perceive. An example would be vibrations moving through air. Please Press Play.
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Waves, Pressure, Medium, Frequency, Range of Hearing all are components of sound.
What is Pitch? |
Pitch is the speed of the vibration and the time it takes to complete a cycle. Pitch is also ordered on a scale from low to high.
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Please Press Play.
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Please Press Play.
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What is Hertz? |
Hertz is usually quantified as frequencies in cycles per second.
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What is a Decibel? |
A Decibel (dB) is a unit of measure that expresses a ratio between two values of a physical quantity, often power or intensity.
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What is Sound Pressure Level or SPL? |
Sound Pressure Level (SPL) is a logarithmic measure of the effective sound pressure of a sound relative to a reference value. It is measured in decibels (dB) relative to a standard reference level. SPL is actually a ratio of the absolute, Sound Pressure and a reference level (usually the Threshold of Hearing, or the lowest intensity sound that can be heard by most people).
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