Title :
Cepstrum-Based Bandwidth Extension for Super-Wideband Coders
Author :
Keunseok Cho ; Sangbae Jeong ; Minsoo Hahn
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
This letter proposes a bandwidth extension (BWE) method using the cepstral envelope coding and duplication of quantized wideband (WB) signals by means of analysis -by-synthesis (AbS) for super-wideband (SWB) coders. In the proposed method, a high frequency band is generated by utilizing the quantized cepstral coefficients extracted from the envelope and the quantized modified discrete cosine transform (MDCT) shape of the wideband signal. The proposed method is compared with the latest G.718 SWB codec and the experimental results show that the proposed method outperforms the baseline codec both in subjective listening tests and objective performance measures.
Keywords :
audio coding; cepstral analysis; discrete cosine transforms; speech codecs; G.718 SWB codec; analysis-by-synthesis; audio coding; cepstral envelope coding; cepstrum-based bandwidth extension method; high frequency band; quantized modified discrete cosine transform shape; quantized wideband signal duplication; speech coding; super-wideband coders; Bandwidth; Cepstral analysis; Codecs; Encoding; Filter banks; Signal processing algorithms; Spectral shape; Bandwidth extension; G.718 SWB codec; cepstral coefficients; generic mode;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2014.2307074
