ASR-Guided Speaker-Role Diarization and Diarization-Guided ASR Decoding

• URL: http://arxiv.org/abs/2507.17765v2
• Date: Fri, 25 Jul 2025 17:02:11 GMT
• Title: ASR-Guided Speaker-Role Diarization and Diarization-Guided ASR Decoding
• Abstract summary: speaker-role diarization (RD) is often more useful than traditional speaker diarization (SD)<n>We show that word prediction and role prediction require different amounts of predictor's context, leading to separate task-specific predictors.<n>We propose a way to leverage RD posterior activity to influence ASR decoding and reduce small-word deletion errors.
• Score: 6.060091782366863
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: From an application standpoint, speaker-role diarization (RD), such as doctor vs. patient, host vs. guest, etc. is often more useful than traditional speaker diarization (SD), which assigns generic labels like speaker-1, speaker-2 etc. In the context of joint automatic speech recognition (ASR) + SD (who spoke what?), recent end-to-end models employ an auxiliary SD transducer, synchronized with the ASR transducer, to predict speakers per word. In this paper, we extend this framework to RD with three key contributions: (1) we simplify the training via forced alignment and cross-entropy loss instead of RNNT loss, (2) we show that word prediction and role prediction require different amounts of predictor's context, leading to separate task-specific predictors, unlike existing shared-predictor models, and (3) we propose a way to leverage RD posterior activity to influence ASR decoding and reduce small-word deletion errors.

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