Princeton University  

16 I have heard of binaural audio and crosstalk cancellation. Are they related to BACCH™ 3D Sound?

As discussed in Q&A 13 , Binaural audio, which usually refers to recordings made with a dummy head21 is intended to be played back through headphones or earphones in order for the listener to perceive a 3D sound image. However, BACCH™ 3D Sound, allows the audiophile, for the first time, to reproduce the excellent 3D audio image (that is coded in binaural recordings) through a pair of standard loudspeakers. In fact, as discussed in Q&A 13 , binaural recordings played through BACCH™ 3D Sound are far more realistic and stable than when played through headphones or earphones.

Crosstalk cancellation (XTC) is the general technique that allows playing binaural recordings through loudspeakers by eliminating the crosstalk (i.e. the sound path between the left loudspeaker and the right ear, and the path between the left loudspeaker and the right ear) which corrupts the transmission of the 3D cues needed to perceive a 3D audio image. The BACCH filter is indeed a crosstalk cancellation filter but differs from previous XTC filters in that it is optimized to deliver maximum XTC at the lowest sound coloration, as described in the technical paper. In other words, unlike other two-loudspeaker XTC filters, the BACCH filters of BACCH™ 3D Sound do not tonally alter the recorded sound.