Patent ID: 9747905
Date: 2017-08-29
CPC Classifications: G10L

Claim:
1. A method of decoding an audio signal, comprising: receiving an encoded bitstream of the audio signal including a downmix audio signal and spatial information, the spatial information including spatial parameters and an indicator, the audio signal and the spatial information generated from a multi-channel audio signal, wherein the spatial parameters include at least inter-channel level difference values (CLDs) and inter-channel-correlation values (ICCs), and the indicator indicates whether an extended spatial parameter is present or not in the spatial information; receiving the extended spatial parameter from the spatial information when the indicator indicates the extended spatial parameter is present in the spatial information or generating an extended spatial parameter by interpolating or extrapolating the spatial parameters when the indicator indicates the extended spatial parameter is not present in the spatial information; generating expanded spatial information by adding the extended spatial parameter to the spatial parameters, wherein the extended spatial parameter includes one of the received extended spatial parameter and the generated extended spatial parameter according to the indicator; and generating an expanded output-channel audio signal from the downmix audio signal using the expanded spatial information.