Interaural time difference ranges roughly 0-700 microseconds across azimuth
Evidence
The ITD varies from 0 μs to approximately 600–700 μs when the azimuth angle varies from 0◦to 90◦. The values derived by the spherical model match the measurements from real heads well, as shown in the figure. Figure 12.10a shows the dependency of the ITD on frequency and on direction as a surface. The values are computed using a cross-correlation type of binaural auditory model. The ITD does not depend significantly on frequency. Only at low frequencies below about 700 Hz are the maxima of the ITDs a bit higher. Some irregularities in ITD functions at frequencies above 2 kHz also exist, and these are due to the complex multi-path wave propagation on the contralateral side. The coherence of the binaural signals is typically lower there, which causes the irregularities in cross-correlation computation. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1429
Categorization
Category: Factual Claims
- CANDY: A concrete number (0-700 microseconds) that makes spatial hearing tangible and fun to share.
Related
- ITD spans 0-700 microseconds across azimuth independent of frequency (similarity 0.95)
- Head size alone predicts interaural time differences well across azimuth angles (similarity 0.86)
- Humans can detect interaural timing differences as small as ten to twenty microseconds (similarity 0.82)
- Ears detect direction changes as small as 5 degrees via 50-microsecond delays (similarity 0.81)
- The ear detects binaural delays finer than individual neuron timing supports (similarity 0.81)
- Directional hearing rests on interaural time and intensity differences. (similarity 0.81)
- Listeners can discriminate interaural time differences of just tens of microseconds below 1.3 kHz. (similarity 0.81)
- Interaural time delay calculations must account for sound traveling around the head (similarity 0.80)
- Interaural level differences and time shifts trade off to control lateralization (similarity 0.80)
- Just-noticeable interaural delay is about 50 microseconds below 1.5 kHz (similarity 0.80)
- Interaural phase difference varies with frequency while interaural time difference does not (similarity 0.79)
- Estimated ITDs match theoretical values especially at low frequencies (similarity 0.79)
- Abrupt changes in interaural timing elicit cortical responses at 50, 100, and 175 ms (similarity 0.79)
- Carrier and envelope time shifts produce lateralization over complementary frequency ranges (similarity 0.79)