A METHOD FOR ENCODING N INPUT AUDIO CHANNELS INTO M ENCODED AUDIO CHANNELS AND A METHOD FOR DECODING M ENCODED AUDIO CHANNELS REPRESENTING N AUDIO CHANNELS

摘要

Multiple channels of audio are combined either to a monophonic composite signal (Figure 1, reference 6) or to multiple channels of audio (Figure 6, reference 6') along with related auxiliary information from which multiple channels of audio are reconstructed (figures 2, 7, 8, 9), including improved downmixing of multiple audio channels to a monophonic audio signal (Figure 1, reference 6) or to multiple audio channels (Figure 6, reference 6') and improved decorrelation (Figures 2 and 7, references 38 and 42, Figure 8, references 46 and 48, and Figure 9, references 50 and 52) of multiple audio channels derived from a monophonic audio channel or from multiple audio channels. Aspects of the disclosed invention are usable in audio encoders (figures 1 and 6), decoders figures 2, 7, 8, and 9), encode/decode systems downmixers (figure 1, reference 6, figure 6, reference 6'), upmixers (figure 7, 8 and 9, reference 20), and decorelators (Figures 2 and 7, references 38 and 42, Figure 8, references 46 and 48, and Figure 9, references 50 and 52).