English is a bit extreme in that respect, since it is very hard (ultimately, impossible using reasonable rules) to fully predict where stresses are, and which one is more prominent (for example the words tigress, the verb pro gress and the noun progress exemplify 1-0, 0-1 and 1-2 stress patterns. Unlike tone systems where you generally have to learn for each syllable what the tone is, in most languages with stress, there are rules that say which syllable has the stress (and most often the distinction is just between stressed and unstresed). Whereas languages with tone may have a dozen different tones, a language with stress has at most primary and secondary stress, plus unstressed. "Stress" is a package deal similar to "tone", but with a vastly reduced set of possible distinctions. At the level of intonation (over longer spans such as a whole word), you can shout a word and that will increase the intensity of the segments therein. Generally, intensity is a correlate of something else, for example the vowels and differ in intensity because the former has a more open vocal tract and acoustic energy is less suppressed and the latter has a more closed vocal tract and more suppression of acoustic energy. Intensity does not have a lexico-grammatical correlate, since unlike pitch differences, languages do not employ loudness as a distinctive property of individual sounds. The "intensity" listing in Praat is the RMS amplitude of the signal, which can be related to (but is not the same as) the perceptual construct "loudness". modifications imposed on longer strings (clauses and utterances, not syllables), and can coexist with a lexico-grammatical tone system or, as in English and Italian, can combine with word stress. Finally, "intonation" is a similar package deal of frequency / amplitude / phonation etc. "Tone" refers to the grammaticalized / lexicalized use of certain larynx-related acoustic properties in some language, such as Yoruba, Japanese, Navaho, Somali, Vietnamese and Chinese: tone is a "package deal", where duration, amplitude, fundamental frequency (including pattern of rise and fall) and voice quality can all be involved: generally, syllables are specified for having some tone. "Pitch" is a psychological (perceptual) construct which is related but different: the most salient difference is that two signals separated by a fixed amount in terms of F0 will appear to be closer together when the frequency range increases (thus signals of 100 Hz and 120 Hz will be clearly distinct and signals of 1000 may not be distinguishable). The thing labeled "pitch" is actually fundamental frequency (F0), so what Praat displays is an approximation of the rate at which the vocal folds vibrate in producing a certain sound.
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