Audio signal processing apparatus and method for crosstalk reduction of an audio signal

An audio signal processing apparatus for filtering a left channel input audio signal (L) to obtain a left channel output audio signal (X1) and for filtering a right channel input audio signal (R) to obtain a right channel output audio signal (X2), the left channel output audio signal (X1) and the right channel output audio signal (X2) to be transmitted over acoustic propagation paths to a listener, wherein transfer functions of the acoustic propagation paths are defined by an acoustic transfer function, ATF, matrix (H), the audio signal processing apparatus comprising:

• a decomposer being configured to decompose the left channel input audio signal (L) into a first left channel input audio sub-signal and a second left channel input audio sub-signal, and to decompose the right channel input audio signal (R) into a first right channel input audio sub-signal and a second right channel input audio sub-signal, wherein the first left channel input audio sub-signal and the first right channel input audio sub-signal are allocated to a first predetermined frequency band, and wherein the second left channel input audio sub-signal and the second right channel input audio sub-signal are allocated to a second predetermined frequency band;
• a first cross-talk reducer being configured to reduce a cross-talk between the first left channel input audio sub-signal and the first right channel input audio sub-signal within the first predetermined frequency band upon the basis of the ATF matrix (H) to obtain a first left channel output audio sub-signal and a first right channel output audio sub-signal;
• a second cross-talk reducer being configured to reduce a cross-talk between the second left channel input audio sub-signal and the second right channel input audio sub-signal within the second predetermined frequency band upon the basis of the ATF matrix (H) to obtain a second left channel output audio sub-signal and a second right channel output audio sub-signal;
• and
• a combiner being configured to combine the first left channel output audio sub-signal and the second left channel output audio sub-signal to obtain the left channel output audio signal (X1), and to combine the first right channel output audio sub-signal and the second right channel output audio sub-signal to obtain the right channel output audio signal (X2).