Patent ID: 7774199

Claim:
A method for processing a signal using pilot based coding (PBC), the method comprising: generating, by an audio coding apparatus, one or more pilot difference values using data elements and a pilot reference value; entropy-encoding the pilot difference values using a particular entropy table among multiple entropy tables used for decoding the pilot difference values; generating entropy table index identifying the particular entropy table; obtaining a codeword corresponding to an entropy-encoded entropy table index by entropy-encoding the entropy table index, wherein variable bits are allocated to the codeword based on frequency for use; and transferring the codeword and the entropy-encoded pilot difference value, wherein: the entropy table index comprises a largest absolute value (LAV) among multiple indexes included in the particular entropy table, a quantity of the pilot difference values is equal to a quantity of the data elements, the pilot reference value is a single value which applies to all of the data elements, and each pilot difference value corresponds to each data element.