Multi-band Recognition Paradigm

Conventional ASR

Multi-band Model

Multi-band approach potentialities:

• Robustness to frequency localized degradation
• Relaxing synchrony constraint between frequency bands
• Use of different recognition strategies in different bands
• Reverberation robustness

Issues to be considered:

• definition of sub-bands
• features in each sub-band
• merging level : word, syllable, phone, state
• merging technique : linear, non-linear