NOTEBRIDGE: A Framework for Real-Time Multimodal Lecture Note-Taking with Evolving Knowledge State

NOTEBRIDGE is a 9-layer real-time multimodal lecture note-taking framework that addresses critical gaps in existing AI educational tools. Unlike systems producing flat transcripts, NOTEBRIDGE maintains an evolving topic-aware knowledge state with hierarchical tracking (supporting suspension, resumption, and merge), grounds claims within authorized curriculum resources via FAISS retrieval, and verifies assertions through a non-mutating verification protocol (F1=0.76). Evaluated on 80 lectures across 5 domains in English and Bangla, it achieves ROUGE-L F1=0.82 and Topic Boundary F1=0.85. Ablation study demonstrates incremental improvement from ASR-only (0.38) to full system (0.81). The framework integrates real-time streaming, privacy-preserving ephemeral processing, and bilingual support for educational note-taking.