Patent ID: 8112284

Claim:
An encoder apparatus comprising: an encoder for encoding an audio signal to obtain an encoded signal, the encoded signal being intended for decoding using a high frequency regeneration technique, which is suited for generating frequency components above a predetermined frequency based on frequency components below the predetermined frequency, the encoder further comprising: a coding algorithm for producing an encoded input signal, which comprises a representation of an input signal that is coded using the coding algorithm, and that represents a frequency content of the audio signal below the predetermined frequency; a high frequency regenerator for performing the high frequency regeneration technique on the input signal or a coded and decoded version thereof to obtain a regenerated signal having frequency components above the predetermined frequency; a detector for detecting differences between the regenerated signal and the audio signal, which are above a significance threshold; a describer for describing detected differences to obtain additional information; and a combiner for combining the encoded input signal and the additional information to produce the encoded signal, wherein the encoder, the coding algorithm, the high frequency regenerator, the detector, the describer or the combiner comprises a hardware implementation.