How the Cochlea Mechanically Separates Frequencies Without Fourier Transform
By
izhak
Hot, fresh, and worth queueing round the block for.
Summary
The article explains how the cochlea processes sound, debunking the common misconception that the ear performs a Fourier transform. It details the mechanical process of sound transmission from the eardrum through the middle ear bones to the cochlea, where the basilar membrane performs frequency separation through mechanical resonance rather than mathematical computation. The article emphasizes that this is a physical, mechanical process where different parts of the basilar membrane resonate with specific frequencies based on their stiffness and mass properties, creating a tonotopic map along the cochlea's length.
Key quotes
· 4 pulledThe tympanic membrane (eardrum) is vibrated by changes in air pressure (sound waves). Bones in the middle ear amplify and send these vibrations to the fluid-filled, snail-shaped cochlea.
Vibrations travel through the fluid to the basilar membrane, which remarkably performs frequency separation: the stiffer, lighter base resonates with high frequency components of the signal, and the more flexible, heavier apex resonates with lower frequencies.
Between the two ends, the resonant frequencies decrease logarithmically in space.
Let's talk about how the cochlea computes!
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