Speech recognition systems

Speaker dependency

Speaker adaptive

Speaking aspects

Speaking mode

Speaking fluency

Speaking rate

Non-speech sounds

Vocabulary aspects

Lexicon size

Speech training material

Lexicon generation

Field speech data (in-situ recording)

Branching factor (Perplexity factor)

Rejection mode

Cut through / Anticipation

Application's vocabulary and confusion matrix

Language modelling

Channel adaptation / Environment adaptation

Task adaptation