Patent ID: 8194754

Claim:
A method of processing signal, the method of processing: receiving broadcast signals including service channel component which contains audio data and channel information component which contains configuration information of the service channel component, the audio data encoded by a data coding scheme, wherein the channel information component includes data coding identification information indicating the data coding scheme; 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 the data bands and obtaining data elements of the group of the data bands using the pilot reference value of the group to the pilot difference values of the group, wherein a quantity of the pilot difference values is equal to a quantity of the data elements of identified group of the data bands, the pilot reference value is a single value which applies to all of the data elements of the identified group of the data bands, and each pilot difference value corresponds to each data element or the identified group of the data bands.