If the vocal folds don't vibrate, or vibrate chaotically, you can't answer the question.Ĭomputing F0 presupposes that you are looking at a vowel-like sound that has regular harmonics. Therefore, there is enough of a repeating signal that you can sensibly ask "how often does this pattern repeat in a given period of time?". The reason why this works for vowels is that the vocal folds vibrate (more or less) regularly during the production of the vowel. This way of talking about frequency and harmonics is appropriate for vowels, but not for fricatives like and. F0 is the first of those harmonics – it's the thing that other harmonics are multiples of. Often, the spikes and valleys become indistinguishable mush. If you look at a "spectral slice" of a sustained vowel, you see a bunch of spikes and valleys – the spikes are at that harmonic frequency, the valleys are the other stuff. 287 bands).Ĭertain kinds of sounds (vowels especially) have repeated high-amplitude sections at multiples of F0 (the number of interest here), for example 150, 300, 450, 600. The analysis is based on dividing the possible frequencies into an even number of frequency bands that is a power of 2 (it is possible but much slower to divide the frequency range into e.g. What makes 100 hz the F0? If it's because 100 hz is the smallest in value, why doesn't it say in the definition of F0 that F0 is the lowest possible frequency at which the vocal cords of a certain person may be vibrating when producing a certain sound?Īny complex waveform (sequence of numbers) can be mathematically decomposed into a sum of sine waves of different amplitudes and frequency: this includes hissing and crashing sounds that you don't think of as having periodic vibrations. So, if during the production of the vowel, the vocal cords may be vibrating at a frequency of 100 hz, 500 hz, 1100 hz, etc. Now according to this book's definition of F0 at the very beginning of 5.2.1 Vowels and sonorants:įor voiced speech sounds we distinguish fundamental frequency (symbol: F0), the frequency at which the vocal chords are vibrating. My question is about how the value of F0 for is assigned? This question is in special regard to the following part from the above quoted textbook:ĭuring the production of the vocal cords may be vibrating at about 100 hz and the first formant (F1) is about 500 hz. So according to this section of the book, F0 seems to vary for people of different genders and ages. And I am learning the concept of 'F0' for the first time. I was reading Introduction to Phonetics and Phonology (Authors and page numbers will be added when I get my iPad back).
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