ISSUES CONCERNING LEXICAL TREES

Increase in Resource Requirements

Small increase in computation compared to word-internal

Network size increases only at word-ends

Trace Projection Decoding

Triphone generation from lexical trees

- trace needs lexical tree node data

Path merging requires careful attention

- identical network structure

- same triphone and state

- same language model history

Pruning - Erase, Delete and Halt modes