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In English, "voicing" can successfully separate /b, d, ɡ/ from /p, t, k/ when stops are at word-medial positions, but this is not always true for word-initial stops. Strictly speaking, word-initial voiced stops /b, d, ɡ/ are only partially voiced, and sometimes are even voiceless."
Stops, or more precisely, oral stops—also known as plosives—are oral occlusives, where the occlusion of the vocal tract stops all airflow—oral and nasal. Examples in English are ( voiced ) / b / , / d / , / ɡ / and ( voiceless ) / p / , / t / , / k / .
English voiceless stops are generally aspirated at the beginning of a stressed syllable, and in the same context, their voiced counterparts are voiced only partway through. In more narrow phonetic transcription , the voiced symbols are maybe used only to represent the presence of articulatory voicing, and aspiration is represented with a ...
Stops, affricates, and occasionally fricatives may occur as ejectives. All ejectives are voiceless, or at least transition from voiced to voiceless. Implosives, which are glottalic ingressive. Here the glottis moves downward, but the lungs may be used simultaneously (to provide voicing), and in some languages no air may actually flow into the ...
Stops, chiefly the voiceless stops, and especially /t/, are frequently glottalized or pre-glottalized in certain positions; that is, a stop may be replaced with the glottal stop [ʔ], or else a glottal stop may be inserted before it. These phenomena are strongly dependent on the phonetic environment and on dialect.
Voiceless stops are allophonically aspirated under most conditions. Voiced stops become unaspirated voiceless stops. All aspirated stops become fricatives. This sequence would lead to the same result. This variety of Grimm's law is often suggested in the context of Proto-Indo-European glottalic theory, which is followed by a minority of linguists.
Geordie English often uses glottal stops for t, k, and p, and has a unique form of glottalization. Additionally, there is the glottal stop as a null onset for English; in other words, it is the non-phonemic glottal stop occurring before isolated or initial vowels. Often a glottal stop happens at the beginning of vowel phonation after a silence. [1]
If the "plain voiced stops" were not voiced, the "voiced aspirated stops" were the only voiced stops. The second constraint can accordingly be reformulated as: two nonglottalic stops must agree in voicing. Since the glottalic stops were outside the voiced/voiceless opposition, they were immune from the constraint on voicing agreement in (2).