Beamforming device

A beamforming device, comprising:

• a probability estimation unit that estimates a speech existence probability corresponding to a probability that a target speech signal exists based on an input vector;
• a steering vector unit that provides an estimated steering vector according to the speech existence probability and the input vector;
• and
• a beamforming unit that calculates a weight vector based on the speech existence probability, the input vector, and the estimated steering vector to provide an output vector,
• wherein
• wherein the speech existence probability is determined according to a target speech signal spatial covariance matrix for the target speech signal included in the input vector;
• the target speech signal spatial covariance matrix for the target speech signal included in the input vector is calculated according to a noise spatial covariance matrix;
• the noise spatial covariance matrix for the noise included in the input vector is calculated according to a noise spatial covariance matrix estimate of a previous frame corresponding to the previous frame of a current frame;
• and
• when the beamforming device operates in a single channel, the input vector is configured by changing the frame and frequency based on the current frame and a reference frequency.