Summary - F.746.25 (04/2026) - Framework and functional requirements for voice interaction of in-vehicle multimodal system

Recommendation ITU-T F.746.25 describes the framework for voice interaction of in-vehicle multimodal system and the workflow of its functions. The framework integrates synchronized audio-visual processing (voice/lip movement fusion) and hybrid decision-making (voice/gesture combination), with kernel function reference points for reproducible implementation.
The Recommendation presents a multimodal fusion recognition (the fusion of voice perception and visual perception) approach that improves the user experience including interactivity. It also enhances the naturalness and effectiveness of voice interaction system.