METHOD AND APPARATUS FOR ENCODING MULTI-CHANNEL HOA AUDIO SIGNALS FOR NOISE REDUCTION, AND METHOD AND APPARATUS FOR DECODING MULTI-CHANNEL HOA AUDIO SIGNALS FOR NOISE REDUCTION

摘要

A method of encoding a multi-channel HOA audio signal for noise reduction comprises: decorrelate (81) a channel using an inverse adaptive DSHT, wherein the inverse adaptive DSHT includes a rotation operation (330) and an inverse DSHT (810). wherein the rotation operation rotates a spatial sampling grid of the iDSHT, perceptually encoding each of the decorrelated channels (82), encoding rotation information (SI), the rotation information comprising: including parameters defining the rotation operation; and transmitting or storing the perceptually encoded audio channel and the encoded rotation information.