ILD applies to which frequency range?

ILD applies to which frequency range?

• A. Low Frequencies (< 3 kHz)
• B. High Frequencies (> 3 kHz)
• C. Mid Frequencies (3-6 kHz)
• D. All frequencies

Answer: (B)

ILD reflects how loud the sound is at each ear, and it relies on the head creating a shadow effect. The head blocks high-frequency sound much more effectively than low-frequency sound because high-frequency waves have shorter wavelengths. So the difference in level between the ears becomes large only at those higher frequencies. That makes ILD a strong cue for localization in the high-frequency range, typically above about 3 kHz. At low and mid frequencies, the wavelengths are long enough to wrap around the head with little attenuation, so the level difference between ears is small and ILD isn’t as informative. In those ranges, other cues like interaural time differences (ITD) play a bigger role.

ILD reflects how loud the sound is at each ear, and it relies on the head creating a shadow effect. The head blocks high-frequency sound much more effectively than low-frequency sound because high-frequency waves have shorter wavelengths. So the difference in level between the ears becomes large only at those higher frequencies. That makes ILD a strong cue for localization in the high-frequency range, typically above about 3 kHz. At low and mid frequencies, the wavelengths are long enough to wrap around the head with little attenuation, so the level difference between ears is small and ILD isn’t as informative. In those ranges, other cues like interaural time differences (ITD) play a bigger role.