![]() In addition, for nasal consonants and nasal vowels, the vocal tract divides into a nasal branch and an oral branch, and interference between these branches produces more antiresonances.That is why, for example, it is difficult to see formants below 3000 or 4000Hz for the two instances of in the spectrogram above. Consequently, they attenuate or eliminate formants at or near these frequencies, so that they appear weakened, or are missing altogether, when you look at spectrograms. An antiresonance is the opposite of a resonance, such that the impedence is high rather than low at those frequencies. For consonants, there are also antiresonances in the vocal tract at one or more frequencies due to oral constrictions. But there is a difference between oral vowels on the one hand, and consonants and nasal vowels on the other.at frequencies where the impedence is low (impedence is resistance to vibration at a given frequency). Formants occur, and are seen on spectrograms, around frequencies that correspond to the resonances of the vocal tract, i.e. periodic voice vibrations or aperiodic hissing) and the result of the filtering is the sound you can hear and record outside the lips and show on a spectrogram. The vocal tract filters a source sound (e.g. ![]() To understand why, you must recall the source-filter theory of speech production.
0 Comments
Leave a Reply. |