Patent ID: 8767850

Claim:
A decoding method of generating a stereo signal from a down-mixed mono signal received in a bitstream, comprising: estimating an Overall Phase Difference (OPD) parameter representing a phase difference between one of a left signal and a right signal and the down-mixed mono signal based on parameters received in the bitstream that represent characteristic relations between channels, the parameters received in the bitstream including an Inter-channel Phase Difference (IPD) parameter and a Channel Level Differences (CLD) parameter; up-mixing, using at least one processing device, the down-mixed mono signal based on the estimated OPD parameter and the parameters received in the bitstream, wherein the estimating of the OPD parameter includes estimating the OPD parameter to be zero upon the IPD parameter being determined to be 180° and the CLD parameter being determined to be 0, wherein the up-mixing up-mixes the down-mixed mono signal based on the estimated OPD parameter.