Patent ID: 8179977

Claim:
A method of processing a signal, the method comprising: receiving broadcast signals including audio data encoded by a data coding scheme and video data ; demodulating the broadcast signals using a pilot signal in the received broadcast signals to output a broadcast stream; demultiplexing the broadcast stream into the video data and the audio data; obtaining data coding identification information indicating the data coding scheme among at least a pilot coding scheme and a differential coding scheme from the audio data, wherein the differential coding scheme includes at least one of a frequency diffrential coding scheme and a time differential coding scheme; and decoding the audio data according to the pilot coding scheme indicated by the data coding identification information and obtaining datang elements of the audio data by using a pilot reference value and one or more pilot difference values which are generated using the data elements and the pilot reference value, wherein a quantity of the pilot difference values is equal to a quantity of the data elements of a 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 current group.