Periodicity cues for pitch split into fine-structure, envelope, and interaction periodicities

Evidence

First, the periodicities of the carrier related to the delay dT1 in Fig. 1 . This periodicity provides some information about the frequency of the pure tone or about the frequency of the carrier. To extract dT1 periodicities, the auditory system is required to be able to phase lock on the instantaneous phase of the signal. dT1 periodicities will be called temporal fine structure periodicities (TSFperiod ) in the following. Second, the periodicities of the envelope (delay dT2 in Fig. 1 ) provides some information about the F0 for harmonic complex tones. dT2 periodicities will be called temporal envelope periodicities (TEperiod ) in the following. Third, the periodicities of the fine structure modulated by the envelope (delay dT3 in Fig. 1 ). This type of periodicities corresponds to the time delays between two energetic phases of the signal located nearby two successive maxima in the envelope. For harmonic complex tones, dT2 is equal to dT3 but for shifted complex tones, dT2 and dT3 are different. As dT3 is necessary a multiple of dT1, for a shifted complex, dT3 will be either equal to n × dT1 or (n + 1) × dT1 choosing the integer n to verify the chain of inequations: n × dT1 ≤ dT2 < (n + 1) × dT1. As such, dT3 depends on both dT1 (fine structure information) and dT2 (envelope information) and can then be described as a periodicity related to an interaction between fine structure and envelope. dT3 periodicities will be called interaction periodicities (TE × TSFperiod ) in the following. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4616

Categorization

• DEFINE: Establishes the three-way taxonomy of temporal periodicity cues (TSF, TE, and their interaction) that structures the whole chapter.
• XREF: Connects to phase-locking literature on auditory nerve fibers and the classic place vs. timing debate in pitch perception.