Low-Latency Speaker-Independent Continuous Speech Separation
This work addresses the need for efficient real-time speech separation in scenarios like meeting transcription, though it appears incremental as it builds on existing SI-CSS methods.
The paper tackles the problem of speaker-independent continuous speech separation (SI-CSS) for low-latency applications, such as transcribing multi-party meetings, by proposing a new method that achieves performance comparable to previous methods while reducing processing latency.
Speaker independent continuous speech separation (SI-CSS) is a task of converting a continuous audio stream, which may contain overlapping voices of unknown speakers, into a fixed number of continuous signals each of which contains no overlapping speech segment. A separated, or cleaned, version of each utterance is generated from one of SI-CSS's output channels nondeterministically without being split up and distributed to multiple channels. A typical application scenario is transcribing multi-party conversations, such as meetings, recorded with microphone arrays. The output signals can be simply sent to a speech recognition engine because they do not include speech overlaps. The previous SI-CSS method uses a neural network trained with permutation invariant training and a data-driven beamformer and thus requires much processing latency. This paper proposes a low-latency SI-CSS method whose performance is comparable to that of the previous method in a microphone array-based meeting transcription task.This is achieved (1) by using a new speech separation network architecture combined with a double buffering scheme and (2) by performing enhancement with a set of fixed beamformers followed by a neural post-filter.