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Most commonly, the change is a result of sound assimilation with an adjacent sound of opposite voicing, but it can also occur word-finally or in contact with a specific vowel. For example, the English suffix -s is pronounced [s] when it follows a voiceless phoneme (cats), and [z] when it follows a voiced phoneme (dogs). [1]
Voice or voicing is a term used in phonetics and phonology to characterize speech sounds (usually consonants). Speech sounds can be described as either voiceless (otherwise known as unvoiced) or voiced. The term, however, is used to refer to two separate concepts:
The voiceless uvular plosive or stop is a type of consonantal sound, used in some spoken languages. It is pronounced like a voiceless velar plosive [k], except that the tongue makes contact not on the soft palate but on the uvula. The symbol in the International Phonetic Alphabet that represents this sound is q , and the equivalent X-SAMPA ...
In fact, the labial is the least stable of the voiceless plosives in the languages of the world, as the unconditioned sound change [p] → [f] (→ [h] → Ø) is quite common in unrelated languages, having occurred in the history of Classical Japanese, Classical Arabic, and Proto-Celtic, for instance.
Word-initially, the contrast has more to do with aspiration; /t/ is aspirated and /d/ is an unaspirated voiceless stop. In the syllable coda, however, /t/ is instead pronounced with glottalization , unrelease, and a shorter vowel while /d/ remains voiceless.
The concept of voice onset time can be traced back as far as the 19th century, when Adjarian (1899: 119) [1] studied the Armenian stops, and characterized them by "the relation that exists between two moments: the one when the consonant bursts when the air is released out of the mouth, or explosion, and the one when the larynx starts vibrating".
Sonorants are sounds such as vowels and nasals that are voiced in most of the world's languages. However, in some languages sonorants may be voiceless, usually allophonically. For example, the Japanese word sukiyaki is pronounced [sɯ̥kijaki] and may sound like [skijaki] to an English speaker, but the lips can be seen to compress for the [ɯ̥].
Taa distinguishes the singular and plural of many nouns via a voiceless vs. voiced initial consonant, and thus there are voiced and voiceless versions of the glottalized nasal and oral clicks. In the voiced versions the glottalization is delayed, so that the hold of the click is partially voiced or nasalized: that is, [ǃˀa] vs. [ᶢǃʔa] and ...