From the course: Audio Foundations: Delay and Modulation
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Constructive and destructive interference
From the course: Audio Foundations: Delay and Modulation
Constructive and destructive interference
Multi-track mixing combines all the tracks you have into a stereo signal. Really two different signals; one intended for the left loudspeaker and the other for the right. You go from several tracks to two, but a curious thing happens when two similar signals are combined. To illustrate this important concept, let's take a look at a few simple sine waves; we'll extend the concept to more musical signals before we're done. If we combine these two sine waves, mix them together, the resulting signal is simply the same frequency sine wave doubled in amplitude. Each of the two sine waves we're mixing is the same frequency and they're perfectly aligned, moving up and down sinusoidally together. Their interaction is perfectly additive. This is known as constructive interference. But let's change the second wave, sliding it to the right along the time axis by half a cycle. If we combine these two sine waves, the resulting signal is silence. These two waves are pushing and pulling against each…
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