【摘要】 文章对语音信号的能量呈现周期性变化的现象进行了研究,提出了一种基于周期能量变化的基音检测方法。采用一个长帧语音信号平均能量作为基准参考能量,用一个短帧语音信号平均能量来表示瞬时能量。由二者可算出瞬时能量测度(InstantEnergyMeasure,IEM)序列。对瞬时能量测度序列进行自相关计算后,得到基音周期。实验分析表明,该方法在干净和噪声环境下,基音周期提取和清浊判决具有令人满意的效果。更多还原

【Abstract】 A pitch detection method based on periodic energy is proposed after devoting a research on the phenomenon of speech signal energy varying periodically.A long-duration analysis window is introduced to compute reference energy and a short-duration analysis window is used to show the instant energy.Instant Energy Measure(IEM)is computed from these two frame signal.Fundamental frequency is obtained after autocorrelation is used on the IEM series.The experimental analysis show s the performance is very satisfactory for pitch extraction and unvoiced/voiced decision with this method under the general background noise.更多还原