- Several other sounds originate in the back of the throat, often as a voiceless click rather than a voiced fricative.
- In English, /h/ is like a voiceless vowel in that there is no fricative-like narrowing in the mouth, so that the greatest point of narrowing is in the glottis.
- More generally, voiceless obstruents are more frequent in onset position than voiced obstruents.
- Voiced sounds such as vowels and certain consonants such as b, d, and g require vibration of the vocal folds, while voiceless sounds such as the consonants p, t, and k require the vocal folds to be wide apart.
- Neither Mandarin Chinese nor Tibetan distinguishes phonologically between voiced and voiceless obstruent initials, unlike Dzongkha and, for example, English.