Patent ID: 8258849

Claim:
A method of processing a signal, the method comprising: receiving: a downmix signal generated from a plural-channel signal, and spatial information indicating attributes of the plural-channel signal, in order to upmix the downmix signal; obtaining an inter-channel phase difference (IPD) coding flag indicating whether an IPD coding is used in the spatial information from a header of the spatial information; obtaining an IPD mode flag indicating whether the IPD value is used in the frame of the spatial information based on the IPD coding flag; obtaining the IPD value from a parameter band in the frame based on the IPD mode flag; and generating a plural-channel signal by applying the IPD value to the downmix signal, wherein the spatial information includes the header and a plurality of frames, wherein the IPD value indicates a phase difference between two channels of the plural-channel signal, and wherein the parameter band is at least one sub-band of a frequency domain including the IPD value.