A multidirectional audio decoder using an “adaptive” audio matrix derives at least one of a plurality of output audio signals from two or more directionally-encoded audio input signal streams (S1(α), S2(α), . . . SN(α), wherein α is the encoded angle of a source audio signal. Each output signal...http://www.google.de/patents/US6970567?utm_source=gb-gplus-sharePatent US6970567 - Method and apparatus for deriving at least one audio signal from two or more input audio signals
