A **third octave** is more like a “**third** of an **octave**”, i.e. an **octave** divided by three. An **octave** is a frequency band that spans within two frequencies with a ratio of 2:1. For instance, the 1000 Hz **octave** band spans from 707 to 1414 Hz.

What is an octave band analyzer?

**Octave Band Analyzer**. Real-time **analyzers** or **octave**-**band analyzers** are special sound level meters that divide noise into its frequency components. Electronic filter circuits are used to divide the sound or noise into individual frequency **bands**.

How much is an octave in frequency?

For example, if one note has a **frequency** of 440 Hz, the note one **octave** above is at 880 Hz, and the note one **octave** below is at 220 Hz. The ratio of **frequencies** of two notes an **octave** apart is therefore 2:1.

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