Patent ID: 8199828

Claim:
A method of processing signal, the method of processing: receiving broadcast signals including service channel component containing audio data and channel information component containing configuration information of the service channel component, the audio data encoded by a specific alternative coding scheme, wherein the audio data includes a downmix signal and spatial information; and 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, and generating a multi-channel signal by applying the data elements of the current group to the downmix signal, wherein 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 clement 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.