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Before we get into really using Audition, I want to make sure we have a basic understanding of a handful of terms that are important in order to work with Audition usefully. I want to start by talking about Frequency. When a sound is created, it travels through a medium. Normally for us, that medium is air, and it travels by changes in air pressure in the form of waves. When those waves hit your eardrums, your brain interprets them as sounds, and the timing of these of waveforms are what we refer to as Frequency. Frequency is measured in Hertz, or Hz. Hertz is also referred to as cycles per second.
The more cycles per second, the higher pitch the sound will be. The fewer cycles per second, the lower the sound pitches. For example, the lowest C on a piano registers around 32 Hertz. Well, the highest note on the piano comes in about 4186 Hertz, or 4.186 Kilohertz. We generally start using Kilohertz when talking about the higher ranges of frequencies. It's generally accepted that the range of human hearing is from a low of about 20 Hertz to a high of about 20,000 Hertz, or 20 Kilohertz. Sound higher than 20 Kilohertz can sometimes be heard by younger people, but as a rule you start to lose that upper range of hearing as you get older.
So what does this have to do with Audition? Well, regardless of what application you're using, it's important to understand what frequency is. As you go along, you'll start to get a sense of at what frequency range certain sounds fall into. This becomes important when you start working with equipment like Graphic Equalizers. If you know at what frequencies the human voice usually falls between, you'll be able to enhance or subdue those portions of the recordings without affecting the rest of the recording. And you'll be able to use tools like the Spectral Frequency Display in Audition to identify unwanted sounds and remove them. So understanding the frequency of sound plays a major role when working with any audio editing application.
But that's only one half of the equation. Sounds are not just measured by their frequencies but also by their amplitude. And we'll talk about amplitude next.
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