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

Volume

21

Issue

4

fYear

2014

fDate

Apr-14

Firstpage

503

Lastpage

507

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;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2014.2307074

Filename

6746029