Bandwidth extension of a narrowband speech coder for music delivery over IP

  • Authors:

  • Young Han Lee;Hong Kook Kim;Mi Suk Lee;Do Young Kim

  • Affiliations:

  • Dept. of Information and Communications, Gwangju Institute of Science and Technology, Gwangju, Korea;Dept. of Information and Communications, Gwangju Institute of Science and Technology, Gwangju, Korea;BcN Service Research Group, BcN Research Division ETRI, Yuseong-gu, Daejeon, Korea;BcN Service Research Group, BcN Research Division ETRI, Yuseong-gu, Daejeon, Korea

  • Venue:
  • ICHIT'06 Proceedings of the 1st international conference on Advances in hybrid information technology
  • Year:
  • 2006

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Abstract

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.