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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:
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]
In English, there may be a brief segment of breathy voice that identifies the plosive as voiceless and not voiced. In voiced plosives, the vocal folds are set for voice before the release, and often vibrate during the entire hold, and in English, the voicing after release is not breathy.
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 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 ...
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds. It is an oral consonant, which means air is allowed to escape through the mouth only.
[n], voiced alveolar nasal [n̥], voiceless alveolar nasal [tʼ], alveolar ejective [ɗ ], voiced alveolar implosive [ɗ̥ ] or [tʼ↓] voiceless alveolar implosive (very rare) Note that alveolar and dental stops are not always carefully distinguished. Acoustically, the two types of sounds are similar, and it is rare for a language to have ...
The alveolar and dental ejective stops are types of consonantal sounds, usually described as voiceless, that are pronounced with a glottalic egressive airstream. In the International Phonetic Alphabet, ejectives are indicated with a "modifier letter apostrophe" ʼ , [1] as in this article.