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| An MP-based Harmonic and Individual Lines Sinusoidal Modeling
in Parametric Audio Coding |
| Wang Jing ;Zhao Sheng-hui; Kuang Jing-ming |
| School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China |
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Abstract This paper presents an MP-based harmonic and individual lines sinusoidal modeling used in parametric audio coding. The input audio signal can be represented by harmonic plus individual lines and the model parameters (amplitudes, frequencies and phases) are extracted by MP (Matching Pursuit) algorithm which can lower computational complexity. The fundamental frequency is obtained by subharmonic summation. Harmonic frequency points are decided by MP exactly and are curve-fitted by quadric polynomial. The corresponding harmonic amplitudes are simulated by LPC spectrum envelope. In the decoder, audio signal is reconstructed with IFFT and OLA. The experimental results show that this sinusoidal modeling can represent the stationary parts of the audio signal very well.
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Received: 03 November 2004
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2006, Vol. 28 
