参数音频编码中的正弦波参数提取

Extraction of Sinusoid Parameters in Parametric Audio Coding

研究了语音编码中基于倒谱的基音检测算法 ,并把它应用到参数音频编码中 ,提出了基于倒谱的正弦波参数提取法。本文根据倒谱的特性 ,结合音频信号的特征 ,利用前后帧的相关性和各次谐波的能量 ,有效保证了基频及其各次谐波在较大频率范围内的正确提取。另外结合谐波和单谱线提取 ,提高了算法效率。

Extraction of sinusoidal model parameters is an important part and its accuracy and efficiency have a great impact on the quality of the codec. A method for fundamental frequency estimation based on cepstrum is proposed. The algorithm based on cepstrum characters, frame correlation and spectrum power is reliable in the extraction of the fundamental frequency and its harmonics within a large frequency domain. Combining harmonic with individual line extraction also reduces the computation of the algortithm.