Each new cochlear structure discovered was cast as the resonant sound receiver

Evidence

The ear canal (external auditory meatus) is a relatively hard-walled tube that is approximately 22.5 mm long and has a diameter of about 7.5 mm, so that its volume is about 1 cm3. Acoustically, it is a short transmission line where sound waves propagate from the external environment to the eardrum. Because one end is open (low acoustic impedance) and the impedance of the eardrum is higher than for the tube itself, the ear canal acts as a quarterwavelength resonator, emphasizing signals around frequencies of 3–4 kHz by about 10 dB, attenuating them at around 7–8 kHz, and showing the next (weak) resonance above 10 kHz. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 728 (#exemplifies, via linked claim)

Categorization

• XREF: connects to: Cochlear resonance and tonotopic pitch mapping were theorized as early as 1683; The ear canal acts as a quarter-wavelength resonator amplifying 3-4 kHz by 10 dB — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 728

Related

• The ear canal acts as a quarter-wavelength resonator amplifying 3-4 kHz by 10 dB (similarity 0.92)
• The ear canal’s quarter-wavelength resonance boosts speech-critical frequencies around 3-4 kHz. (similarity 0.88)
• A normal-sounding ear is internally a sound source audible in the closed canal (similarity 0.84)
• The outer ear both locates sound sources and boosts certain frequencies (similarity 0.83)
• The singer’s formant arises from a quarter-wave resonator in the larynx (similarity 0.83)
• The middle ear evolved as an impedance transformer to bridge air-water sound energy loss (similarity 0.81)
• Cochlear resonance and tonotopic pitch mapping were theorized as early as 1683 (similarity 0.80)
• The middle ear functions as an impedance transformer matching air to fluid (similarity 0.80)
• Unlike the eye, the ear has no primary directional sensitivity (similarity 0.79)
• Outer ear canal resonance explains peak sensitivity near 4 kHz (similarity 0.79)
• The ossicles mechanically transform impedance to overcome fluid resistance (similarity 0.78)
• Outer and middle ear structures provide frequency-specific amplification of incoming sound (similarity 0.78)

Broader Connections

• The ear canal acts as a quarter-wavelength resonator amplifying 3-4 kHz by 10 dB #exemplifies (0.75) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 728