This paper deals with diagonal variable loading recursive least squares (VLRLS) array beamforming based on a generalized sidelobe canceller. In conjunction with a subweight partition approach, the VLRLS-based beamformer demonstrates the advantages of fast convergence speed, insensitivity to dynamic estimate modeling error, less computational load, and more robust to against pointing errors and ...

Hands-free speech telephony and speech recognition in cars suffer from additive noise and reverberation. We propose an iterative blind channel estimation algorithm based on an analysis-by-synthesis loop closed around a multipath Generalized Sidelobe Canceller (GSC). By combining a post-filter with the proposed scheme, optimal speech enhancement in practical situations can be achieved. The algor...

An echo canceller removes undesired echo in fullduplex speech communication. The cancellation is done by modeling the echo path impulse response with an adaptive finite impulse response filter and subtracting the echo estimate from the received signal. A typical diagram of an echo canceller is depicted in Figure 1. The signal x(n) and v(n) represent the far-end and near-end speeches respectivel...

In this contribution we introduce a new implementation of superdirective beamformers. The new structure has the advantage of reduced computational complexity. This advantage is due to a GSClike (Generalized Sidelobe Canceller) scheme. Unlike the conventional GSC, the filters in the sidelobe cancelling path are fixed and can be computed in advance by using the Wiener solution. The new structure ...

We consider a beamforming scheme for binaural hearing aids and analyze the effects of quantization on its performance. A limited bandwidth wireless link is assumed between the binaural hearing aids for communication from one ear to the other ear, where signals are then processed using a generalized sidelobe canceller (GSC). We consider the case where observations are quantized before transmissi...

In many acoustic applications, the extraction of only one desired source signal from a mixture of signals is required. We propose a novel method to perform this extraction in the overdetermined case where more sensors than sources are available. We apply blind signal processing techniques in a structure that is similar to a Generalized Sidelobe Canceller (GSC). In a GSC the upper branch reprodu...

Combating noise signals is still a very important and challenging research topic. Previously, we presented a subtractive-beamformer-based noise reduction algorithm using paired microphones, which was shown to be effective in reducing directional noise. However, its basic assumption, namely a perfectly coherent noise field, is generally not satisfied in real-world environments. In this paper, we...

The conventional adaptive beamformers face the problem of performance degradation in the presence of desired signal in the training data snapshots if there is a small mismatch between the presumed and the actual signal direction. In case of such mismatch, these beamformers generate the main beam in the presumed direction of desired signal and the actual signal with mismatched direction is consi...