Part 6/8:
Combination tones arise when two sounds combine to produce perceived additional tones, often detectable when frequencies summarize down to lower harmonic levels. The phenomenon of the missing fundamental occurs when we hear notes without the foundational frequencies present. This showcases our brain's remarkable ability to extrapolate lower frequencies based solely on higher harmonic information. These perceptual tricks are often employed in audio engineering to enhance sound quality across various playback devices, including smartphones and headphones.