Phoneme
The smallest unit of sound in language that distinguishes meaning - like /p/ and /b/ in "pat" vs. "bat."
Think of it like
In English, letters; in speech, phonemes. Phones (sounds) are instances; phonemes are categories.
Example
English: "cat" = /k/ /a/ /t/ (3 phonemes). "ship" = /sh/ /i/ /p/ (3 phonemes). "thought" = /th/ /o/ /t/ (3 phonemes).
How it actually works
Language-specific inventory. English ~= 44 phonemes; Spanish ~= 24. Recognition: acoustic models predict phonemes from spectrograms (Gaussian mixtures, DNNs, HMMs). Text-to-speech needs phoneme-level alignment. CTC loss (Connectionist Temporal Classification) allows direct acoustic-to-phoneme without explicit alignment.
For product teams
Core for speech recognition, TTS, and language learning apps.
For engineers
Datasets: TIMIT (phoneme labels). Metrics: phoneme error rate (PER). Models: acoustic models trained with HMMs or CTC.
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