Fundamental Frequency of Speech
The fundamental frequency of speech can vary from 40 Hz for low-pitched male voices to 600 Hz for children or high-pitched female voices.
Autocorrelation methods need at least two pitch periods to detect pitch. This means that in order to detect a fundamental frequency of 40 Hz, at least 50 milliseconds (ms) of the speech signal must be analyzed. However, during 50 ms, speech with higher fundamental frequencies may not necessarily have the same fundamental frequency throughout the window.
Read more about this topic: Pitch Detection Algorithm
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