High-frequency auditory analysis preserves only the temporal envelope of signals

Evidence

At higher frequencies, the IACC no longer shows side bands, since the temporal details of the signals are mostly lost, which is also evident in Figure 13.12c. Instead, only the temporal envelope is preserved, and since, in this case, the signal was a short excerpt of the vowel /a/, a rather strong temporal structure remains. The cross-correlation between the left and right signals then results in only a single hump in the IACC functions. Such a clear unitary hump is not always found in the simulation results. If the input had been, for example, a high-frequency sinusoidal tone, the high-frequency IACC functions would be completely flat as a function of the time lag. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1672

Categorization

• DEFINE: Explains what IACC (interaural cross-correlation) functions represent and how they degrade at high frequencies.