The tympanic membrane, also known as the eardrum, is located in the middle ear and it's cone shaped. It's a tiny flap of skin that vibrates with the sound you hear. For high frequency, which is high pitched, noises, the flap vibrates faster and vice versa. Louder sounds make the drum move greater distances.
And What I think is cool about it:
It can actually prioritize noise. That's how you can keep a conversation over a loud vacuum cleaner, because its reflex makes it tone down the low pitched noise to make it focus on higher pitched sounds such as voices.
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