一种基于匹配跟踪的谐波和独立谱线正弦模型实现方案
An MP-based Harmonic and Individual Lines Sinusoidal Modeling in Parametric Audio Coding
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摘要: 该文基于匹配跟踪的谐波和独立谱线正弦模型提出了一种用于参数音频编码的实现方案，输入音频信号的正弦成分由谐波联合独立谱线共同表示，分析合成过程采用50%叠接相加(OLA)消除帧间不连续，匹配跟踪(MP)算法在频域提取模型参数(幅度、频率和相位)大大降低运算复杂度。谐波谱线基频由谐波积谱法(SHS)获得，各次谐波频点确切位置借助MP迭代过程推出，并进行二次曲线拟合，对应的谐波幅度采用LPC谱包络近似。独立谱线的提取有效弥补了谐波提取不足。实验证明该文提出的正弦模型实现方案可以很好地表示出音频信号中的平稳成分，并对低比特率的参数音频编码有一定的借鉴性。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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Serra X , Smith J O. Spectral modeling synthesis: a sound analysis/synthesis system based on a deterministic plus stochastic decomposition. International Computer Music Journal, 1990, 14(4): 14.24.[2]George E B, Smith M J T. Analysis-by-synthesis/overlap-add sinusoidal modeling applied to the analysis and synthesis of musical tones. J. Audio Eng. Soc., 1992, 40(6): 497.515.[3]Hermes D. Measurement of pitch by subharmonic summation[J].J. Acoust. Soc. Am.1988, 83(1):257-[4]Mallat S , Zhang Z. Matching pursuit with time-frequency dictionaries[J].IEEE Trans. on Signal Processing.1993, 41(12):3397-[5]周宏，陈健. 基于正弦波的参数音频编码算法. 通信技术，2002，(2)：4.6.[6]陶峻，陈健，曾文珺. 参数音频编码中的正弦波参数提取. 数据采集与处理，2003, 18(2): 161.164.[7]张文耀，许刚，王裕国. 基于匹配跟踪的感知梯度正弦建模方法. 软件学报，2003, 14(3): 467.472. -
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