Patent ID: 8019611

Claim:
A method of processing a signal, the method comprising: receiving a broadcast signal including audio data encoded by a data coding scheme and video data; demodulating the broadcast signal using a pilot signal in the received broadcast signal to output a broadcast stream; demultiplexing the broadcast stream to obtain the audio data and an identifier for identifying the data coding scheme; and decoding the audio data by obtaining first frequency grouping information identifying a number of parameter bands within a current frame of the audio data and second frequency grouping information identifying a group of data bands from the number of parameter bands, extracting a pilot reference value and pilot difference values from the identified group of data bands and obtaining data elements of the group of data bands through adding the pilot reference value of the group to the pilot difference values of the group respectively, wherein the pilot reference value is decided with reference to the data elements of the group, the pilot reference value is a single value which applies to all of the data elements of the group in the frame, the pilot difference values of the group are generated by subtracting the pilot reference value of the group from the data elements of the group respectively, and a number of the pilot difference values of the group is equal to a number of the data elements of the group.