Fig. 6

Behaviour of the integrated MVDR-LMA-XM beamformer at a frequency of 2 kHz as a function of \(\widetilde {\epsilon }\) and \(\hat {\epsilon }\) for the case when the source is at 60^∘, i.e. not in the direction of the a priori constraint. (a) Lagrangian multiplier, log10(α). (b) Lagrangian multiplier, log10(β). (c) ΔSNR. (d) Speech distortion (SD). The APC and DDC bounding curves analogous to those from Fig. 1 are also shown