The singer’s formant arises from a quarter-wave resonator in the larynx

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 (#complicates, via linked claim)

Categorization

• XREF: connects to: A singer’s formant boosts a distinct energy band near 2.4-3.5 kHz; The ear canal acts as a quarter-wavelength resonator amplifying 3-4 kHz by 10 dB — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 728; A resonant cavity can isolate a single frequency from complex sound. — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 920 (+2 more)

Related

• The ear canal acts as a quarter-wavelength resonator amplifying 3-4 kHz by 10 dB (similarity 0.84)
• The ear canal’s quarter-wavelength resonance boosts speech-critical frequencies around 3-4 kHz. (similarity 0.83)
• Each new cochlear structure discovered was cast as the resonant sound receiver (similarity 0.83)
• The singer’s formant arises from a laryngeal cavity resonance shaped by false vocal folds (similarity 0.82)
• A singer’s formant near 3 kHz lets trained voices cut through orchestra sound (similarity 0.80)

Broader Connections

• A singer’s formant boosts a distinct energy band near 2.4-3.5 kHz #expands (0.95)
• The ear canal acts as a quarter-wavelength resonator amplifying 3-4 kHz by 10 dB #complicates (0.85) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 728
• A resonant cavity can isolate a single frequency from complex sound. #expands (0.80) — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 920
• The human vocal tract behaves acoustically as a stopped pipe about 17.5 cm long. #expands (0.80)
• Higher formants above the third shape vocal identity and projection #expands (0.75)