Patent ID: 7643561

Claim:
A method for processing a signal using pilot based coding (PBC), the method comprising: extracting, by an audio coding apparatus, a pilot reference value and one or more pilot difference values; obtaining one or more gain values of a current group included in a current frame using the pilot reference value and the pilot difference values, without using gain values of an other frame; and reconstructing an audio signal using the one or more gain values of the current group, wherein: the pilot reference value is dependent on each of the gain values of the current group and is not dependent on the gain values of the other frame, a quantity of the pilot difference values is equal to a quantity of the gain values of the current group, the pilot reference value is a single value which applies to all of the gain values of the current group, each pilot difference value corresponds to each gain value of the current group, and the gain values of the current group are used to adjust a gain of the audio signal.