Patent ID: 7696907

Claim:
A method for processing a signal using pilot based coding (PBC), the method comprising: obtaining, by an audio coding apparatus, channel grouping information identifying a group of low frequency parameters bands to apply to a low frequency channel when a low frequency channel (LFE) mode is specified; obtaining a pilot reference value and one or more pilot difference values associated with the identified group of low frequency parameter bands; and obtaining data elements of the identified group of low frequency parameter bands using the pilot reference value and the one or more pilot difference values, wherein: the pilot reference value is dependent on the data elements of the identified group of low frequency parameter bands included in a current frame, and is not dependent on data elements of an other frame, a quantity of the pilot difference values is equal to a quantity of the data elements of the identified group of low frequency parameter bands, the pilot reference value is a single value which applies to all of the data elements of the identified group of low frequency parameter bands, and each pilot difference value corresponds to each data element of the identified group of low frequency parameter bands.