Signal Processing Apparatus, Method and Computer Program for Dereverberating a Number of Input Audio Signals

A signal processing method for dereverberating a number of input audio signals, comprising:

• transforming the number of input audio signals into a transformed domain to obtain input transformed coefficients, wherein the input transformed coefficients being arranged to form an input transformed coefficient matrix;
• determining filter coefficients upon the basis of eigenvalues of a signal space, wherein the filter coefficients being arranged to form a filter coefficient matrix;
• convolving the input transformed coefficients of the input transformed coefficient matrix by the filter coefficients of the filter coefficient matrix to obtain output transformed coefficients, wherein the output transformed coefficients being arranged to form an output transformed coefficient matrix;
• and
• inversely transforming the output transformed coefficient matrix from the transformed domain to obtain a number of output audio signals.

A computer program, comprising a program code for performing a signal processing method when executed on a computer, wherein the signal processing method comprises:

• transforming a number of input audio signals into a transformed domain to obtain input transformed coefficients, wherein the input transformed coefficients being arranged to form an input transformed coefficient matrix;
• determining filter coefficients upon the basis of eigenvalues of a signal space, wherein the filter coefficients being arranged to form a filter coefficient matrix;
• convolving the input transformed coefficients of the input transformed coefficient matrix by the filter coefficients of the filter coefficient matrix to obtain output transformed coefficients, wherein the output transformed coefficients being arranged to form an output transformed coefficient matrix;
• and
• inversely transforming the output transformed coefficient matrix from the transformed domain to obtain a number of output audio signals.