  We propose a Beamformer-guided Target Speaker Extraction (BG-TSE) method to
extract a target speaker's voice from a multi-channel recording informed by the
direction of arrival of the target. The proposed method employs a front-end
beamformer steered towards the target speaker to provide an auxiliary signal to
a single-channel TSE system. By allowing for time-varying embeddings in the
single-channel TSE block, the proposed method fully exploits the correspondence
between the front-end beamformer output and the target speech in the microphone
signal. Experimental evaluation on simulated multi-channel 2-speaker mixtures,
in both anechoic and reverberant conditions, demonstrates the advantage of the
proposed method compared to recent single-channel and multi-channel baselines.
