voicing occurs during only part of the sound (short duration). In the case of English, it is the latter.

Ju?'hoan and some of its neighboring languages are typologically unusual in having contrastive partially-voiced consonants. They have aspirate and ejective consonants, which are normally incompatible with voicing, in voiceless and voiced pairs. The consonants start out voiced but become voiceless partway through and allow normal aspiration or ejection.