binaural cue coding (audio) (BCC)

Binaural Cue Coding(BCC) is an audio compression technique that converts stereophonic audio into mono audio and adds additional information, similar to Spatial Audio Coding( SAC). In general, all compression techniques attempt to increase the information density without noticeable loss of quality.

The BCC method relies on the fact that a stereophonic effect is based on delay and level differences between the two stereo channels. So you can create a stereo signal from a monosignal by raising or lowering certain frequency components and changing their delay time. Everything else is processed by the human brain.

To keep the data rate as low as possible, BCC coding generates a mono signal from a stereo signal via a downmix. In addition, special channel difference information is generated. This sideband information has a small data volume, so that both pieces of information together, the calculated mono signal and the sideband information, have a much smaller data volume than two stereo channels.

From the calculated mono signal and the sideband information the stereo signal is reconstructed. The BCC method works with Parametric Stereo( PS) and can also be used for multiple audio channels.