Patent ID: 8346379
Filing Date: 2013-01-01
Classification: G10L

Abstract:
1. 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 to upmix the downmix signal; obtaining an inter-channel phase difference (IPD) coding flag indicating whether an IPD value is used in the spatial information from a header of the spatial information; obtaining an IPD mode flag based on the IPD coding flag from a frame of the spatial information, the IPD mode flag indicating whether the IPD value is used in the frame of the spatial information; obtaining the IPD value based on the IPD mode flag, wherein the IPD value corresponds to a parameter band of a parameter time slot in the frame of the spatial information; smoothing the IPD value by modifying the IPD value by using an IPD value of a previous parameter time slot; and generating the plural channel signal by applying the smoothed 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, wherein the parameter time slot indicates a time slot to which the IPD value is applied, and wherein the parameter band is at least one sub-band of a frequency domain that includes the IPD value.