Sciweavers

Share
ICASSP
2011
IEEE

Coding of unquantized spectrum sub-bands in superwideband audio codecs

8 years 6 days ago
Coding of unquantized spectrum sub-bands in superwideband audio codecs
We present several new methods for coding of spectrum coefficients in embedded audio codecs. In audio codecs, the spectrum is often divided in sub-bands, and quantized using a vector quantization. In many applications, the limited bit-budget allocated to the vector quantization is not sufficient to cover all the sub-bands, and the distortion of the spectrum in the unquantized sub-bands frequently causes audio quality degradation. The presented methods have been designed to improve the representation efficiency of the spectrum in these sub-bands. They consist of a preprocessing of the spectrum before the vector quantization, a correction of the encoded spectral envelope after the quantization, and a filling of the unquantized spectrum sub-bands. These methods have been used in the superwideband
Vaclav Eksler, Milan Jelinek
Added 21 Aug 2011
Updated 21 Aug 2011
Type Journal
Year 2011
Where ICASSP
Authors Vaclav Eksler, Milan Jelinek
Comments (0)
books