VOCAL’s Minimum Variance Distortionless Response (MVDR) Beamformer software, also known as the Capon Beamformer, is used for speech enhancement applications, including noise reduction and speech dereverberation. The MVDR beamformer software package includes a beamforming algorithm to dynamically steer a beam at the source location. A source localization algorithm is also available to provide the beamformer with the source location coordinates.
Our MVDR beamformer software may be licensed as a standalone algorithm or library with custom solutions available. Contact us to discuss your beamforming application requirements.
The Minimum Variance Distortionless Response (MVDR) beamformer minimizes the array output power and maintains a distortionless mainlobe response toward the desired signal. The weighting vector of the MVDR beamformer is determined by:
wMVDR = argw min(wHRxw), subject to wHa(ϴ0) = 1 
- Rx is the covariance matrix of the received signal vector x(k),
- wHa(ϴ0) = 1 is the distortionless constraint applied to the signal of interest, and
- a is a steering vector at direction ϴ.
 J. Li, J. Chen, and P. Stoica, ”Robust Adaptive Beamformer”, hoboken, New Jersey, John Wiley & Sons, 2006.
 Y. Liu, and Q. Wan, ”A Robust Beamformer Based On Weighted Sparse Constraint”, Progress in Electromagnetics Research Letters, Vol. 16, 53-60, 2010.