Patent ID: 8249863

Claim:
An apparatus for estimating spectrum information of an audio signal, the apparatus comprising: an audio signal input unit receiving an audio signal; and a processor comprising: a pitch detector module detecting a pitch of the audio signal received through the audio signal input unit and providing the pitch to a structuring set size (SSS) determiner module; said (SSS) determiner module determining a period of the pitch as an SSS and providing the SSS to a morphology filter module, and said morphology filter module performing an morphological operation on the audio signal in accordance with the provided SSS; a remainder signal extractor module extracting peaks from the audio signal, which has been subjected to the morphological operation, by using a peak extraction method, extracting a remainder signal region from the extracted peaks, and identifying whether the remainder signal region corresponds to a true-peaks spectrum; and a spectral envelope detector module detecting a spectral envelope by performing an interpolation operation on the identified true peaks spectrum.