Empowering Whisper as a Joint Multi-Talker and Target-Talker Speech Recognition System
This addresses transcription challenges in multi-talker scenarios for speech recognition applications, though it is incremental as it builds on existing Whisper models.
The paper tackled joint multi-talker and target-talker speech recognition by extending Whisper with a separator and identifier, achieving improved performance on LibriMix and LibriSpeechMix datasets and acceptable zero-shot results on AishellMix.
Multi-talker speech recognition and target-talker speech recognition, both involve transcription in multi-talker contexts, remain significant challenges. However, existing methods rarely attempt to simultaneously address both tasks. In this study, we propose a pioneering approach to empower Whisper, which is a speech foundation model, to tackle joint multi-talker and target-talker speech recognition tasks. Specifically, (i) we freeze Whisper and plug a Sidecar separator into its encoder to separate mixed embedding for multiple talkers; (ii) a Target Talker Identifier is introduced to identify the embedding flow of the target talker on the fly, requiring only three-second enrollment speech as a cue; (iii) soft prompt tuning for decoder is explored for better task adaptation. Our method outperforms previous methods on two- and three-talker LibriMix and LibriSpeechMix datasets for both tasks, and delivers acceptable zero-shot performance on multi-talker ASR on AishellMix Mandarin dataset.