Our mouths are already making the vowel shape but the vocal cords have not started vibrating yet.Įxactly the same thing happens when the sound after the or is one of the approximant sounds. Really what we are hearing is a devoiced vowel. In a word like pool where the sound after the plosive is a vowel sound, we call this -like quality at the beginning of the vowel aspiration. During the gap between the and our vocal folds starting to vibrate, we can hear this air rushing out of our mouths. After we release our lips for the in pool air starts rushing out of our mouths as it is pushed up from the lungs. The Voice Onset Time in English is quite long in this situation. So, for example, in the word pool /pu:l/, there is a gap between our lips opening for the and our vocal cords vibrating for the following. There is a delay before our vocal cords start vibrating. However, after at the beginning of a stressed syllable something strange happens. This means that they have pitch and that our vocal cords vibrate when we make them. Now, the phonemes /r, l, w, j/ and the vowel sounds are voiced.
English only allows the consonants /r, l, w, j/ or a vowel after a /p, t/ or /k/ at the start of a syllable. In English there are rules about what types of sound can occur after these consonants when they occur at the beginning of a syllable (these are called phonotactic rules or phonotoactic constraints). When the voiceless plosives or occur at the beginning of a stressed syllable in English, they have an effect on the following voiced sounds. We don't vibrate our vocal folds for an sound, so it has no musical pitch. You cannot do this, for example, with an unvoiced sound like. For this reason, you can sing a tune using a sound. We can make voiced sounds with a high pitch or a low pitch. When we make a voiced sound, for example a vowel sound, our vocal cords vibrate.
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