Patent ID: 8170885

Claim:
A wideband audio signal coding device comprising: an enhancement layer configured to extract a first spectrum parameter from an inputted wideband signal having a first bandwidth, quantize the first spectrum parameter, and convert the first spectrum parameter into a second spectrum parameter; and a coding unit configured to extract a narrowband signal from the inputted wideband signal and code the narrowband signal based on the second spectrum parameter provided from the enhancement layer, wherein the narrowband signal has a second bandwidth smaller than the first bandwidth, and wherein the enhancement layer is configured to normalize the first spectrum parameter, apply an inverse discrete cosine transform (IDCT) to the normalized first spectrum parameter, convert the IDCT applied first spectrum parameter into an exponential scale to extract a frequency component, extract a narrowband spectrum having the second bandwidth from the frequency component, apply an inverse fast Fourier transform (IFFT) to the narrowband spectrum, and convert the IFFT applied narrowband spectrum into the second spectrum parameter using a Levinson-Durbin algorithm.