Patent ID: 7970072

Claim:
A method of processing a signal, the method comprising: receiving broadcast signals including video data and audio data encoded by a data coding scheme; demodulating the broadcast signals using a pilot signal in the received broadcast signals to output a broadcast stream; demultiplexing the broadcast stream to obtain the audio data which include a downmix signal and spatial information; and decoding the audio data by 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 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.