Patent ID: 7756702

Claim:
A method for processing a signal using pilot based coding, the method comprising: receiving, by an audio coding apparatus, a downmix signal and spatial information; extracting a pilot reference value and one or more pilot difference values from the spatial information; obtaining one or more data elements of a current group included in a current frame using the pilot reference value and the pilot difference values, without using data elements of another frame; and generating a multi-channel signal by applying the data elements of the current group to the downmix signal, wherein: the pilot reference value is dependent on each of the data elements of the current group and is not dependent on the data elements of another frame, a quantity of the pilot difference values is equal to a quantity of the data elements of the current group, the pilot reference value is a single value which applies to all of the data elements of the current group, each pilot difference value corresponds to each data element of the current group, and the data elements comprise at least one of a channel level difference, an interchannel coherence and a channel prediction coefficient.