谱平整自相关基音检测器的设计

Design of Pitch Extraction by leveled Spectrum Autocorrelation

用谱平整自相关法设计了基音检测器,提出了峰检测时的纠偏措施,采用可变阈值作为峰检测的门限,增加了帧能量和过零率来辅助进行清/浊音判决,对基音周期又进行了平滑,使得基音检测的准确性得以提高。

The difficulties and methods for pitch extraction are discussed briefly in this paper. The pitch extraction is implemented by leveled spectrum autocorrelation. The corresponding pitch detector is designed with corrective measures for peak detection at the terminal points. A varying threshold for peak detection is proposed. The u/v decision is made by the assistance of the pawer and zero crossing rate in a frame. At last, the pitch is smoothed. In this way the overall accuracy of pitch extraction is increased.