상세정보
학술대회
Bandwidth Extension of a Narrowband Speech Coder for Music Delivery over IP
- 발행일
- 200611
- 출처
- International Conference on Hybrid Information Technology (ICHIT) 2006 (LNCS 4413), v.4413, pp.198-208
- 협약과제
- 06MT2400, 가변대역 멀티코덱 및 제어기술 개발, 김도영
- 초록
- In this paper, we propose a bandwidth extension (BWE) algorithm of a narrowband speech coder for music delivery services over IP networks. The proposed BWE algorithm is based on an embedded structure of using a baseline coder followed by an enhancement layer. To minimize the bit-rate increase by the enhancement layer, the proposed algorithm shares spectral envelope and excitation parameters between the baseline coder and the enhancement layer. In this paper, we choose the iLBC as the baseline coder and mel-frequency cepstral coefficients (MFCCs) are used to reconstruct higher frequency components at the enhancement layer. By doing this, the bit-rate of the proposed BWE coder is 15.45 kbit/s which is just 0.25 kbit/s higher than the iLBC We compare the quality of the proposed BWE coder with that of the iLBC, and it is shown from an informal listening test that the proposed BWE coder provides significantly better quality than the iLBC for all four different kinds of music genres such as pop, classical, jazz and rock. © Springer-Verlag Berlin Heidelberg 2007.
- KSP 제안 키워드
- Bandwidth extension, Bit Rate, Embedded structure, Enhancement layer, Frequency cepstral coefficients, Frequency components, IP networks, Mel-Frequency Cepstrum Coefficients(MFCC), Mel-frequency cepstral, Speech coder, higher frequency