From the course: Digital Audio Foundations
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Metering
- Sound is made up of movement. A sound wave that doesn't move, doesn't exist. (piano note plays) This sound constantly varies in amplitude level. For example, at this moment, just as the note is struck, the amplitude is at its loudest. Over the course of the rest of the note the overall amplitude gradually decays. All the while the instantaneous amplitude of the sound is cycling. in the way sound waves do. At any given instant in the wave's cycle the measurement of amplitude might be practically anything. How do we measure the loudness of the sound in a way that makes sense? The answer lies in measuring not just a single point of the wave, but an area, a moving window over time. (piano note plays) Let's discuss how we measure the amplitude of sound using this brief piano recording as an example. That first moment is an example of a transient peak. "Transient," meaning it comes and goes very quickly, and "peak," meaning it's a loud spot. We're going to use this to demonstrate…
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