Patent ID: 7756701

Claim:
A system for processing a signal, the system comprising: an audio coding apparatus configured to: receive a downmix signal and spatial information, obtain, by an audio coding apparatus, a pilot reference value and one or more pilot difference values from the spatial information, entropy-decode the pilot difference values, obtain data elements of a current group included in a current frame using the pilot reference value and the entropy-decoded pilot difference values, without using data elements of an other frame, and generate 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 the other 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, and each pilot difference value corresponds to each data element of the current group.