[b]→[p]Certainty: 5/5Commonality: 5/5

Tonogenesis Register Split Voice Loss Devoicing Consonants Sino-Tibetan Austroasiatic Tai-Kadai

Voiced bilabial plosive to Voiceless bilabial plosive

In the evolution of East Asian tonal systems, the Voice Loss of initial consonants like [b] to [p] is a primary catalyst for a Register Split. Voiced initials originally lowered the Pitch Contour of the following vowel (Low Register), while voiceless initials raised it (High Register). When the voicing distinction was lost, the pitch difference was phonemicized as distinct tones.

Phonetic Effects

Voice Loss, Devoicing, Register Split, Tonogenesis

Language Examples

Vietnamese Austroasiatic

*ba→bò /ɓɔː˨˩/— The loss of voicing in initial consonants led to the doubling of the tone system (from 3 to 6 tones) in Vietnamese, creating low-register counterparts.

Historical *b-→p- (Low Register)— Initial voicing loss triggered the development of the lower-register tones (Huyền, Nặng, etc.).

Middle Chinese Sino-Tibetan

*bing→píng /pʰiŋ˧˥/— Voiced initials like [b] in Early Middle Chinese (Quánzhuó) triggered a split in the four traditional tone categories (Yīn/Yáng split).

Early Middle Chinese *b-→Late Middle Chinese p-— Devoicing of the 'Muddy' (濁) initials created the Yīn (high) and Yáng (low) register distinction.

Thai Tai-Kadai

*ba→pâa /paː˥˩/— Tai-Kadai languages underwent a massive Register Split where the voicing of the initial consonant determined the height of the resulting tone.

Proto-Tai *b-→p-— Voicing loss in initials led to the split of the original three tones into high and low registers.

Related Transformations

Reverse

More Tai-Kadai Shifts

[a] → [ã] — Assimilatory Nasalization [tɕ] → [ɕ] — Lenition [d] → [t] — Voice Loss [dz] → [l] — Deaffrication [ɡʲ] → [tɕ] — Palatalization

Sources & References

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