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German has a similar sound /p?f/ in Pfeffer ('pepper') and Apfel/'ap?f?l/ ('apple'). Phonotactically, this sound does not occur after long vowels, diphthongs or /l/. It differs from a true labiodental affricate in that it starts out bilabial but then the lower lip retracts slightly for the frication.
The sound occurs occasionally in English, in words where one syllable ends with "p" and the next starts with "f", like in "helpful" or "stepfather".
Features of the voiceless labiodental affricate:
Its manner of articulation is affricate, which means it is produced by first stopping the airflow entirely, then allowing air flow through a constricted channel at the place of articulation, causing turbulence.
bilabial, which means it is articulated with both lips. The affricate with this stop component is called bilabial-labiodental.
labiodental, which means it is articulated with the lower lip and the upper teeth.
The fricative component of this affricate is labiodental, articulated with the lower lip and the upper teeth.
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.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.