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为了实现甚低码率下的透明语音质量参数语音编码,该文提出了一种新的鲁棒的基音周期估计算法。这种算法采用了改进的自相关函数计算方法,实现了鲁棒的基音周期轨迹跟踪。这种算法不仅能够跟踪快变的基音周期,增强不规则脉冲时基音周期的估计;还能够鲁棒地估计陡变的基音周期。非正式的测试表明这种算法改进了基音周期的估计值,能够极大地降低由于不准确的基音周期估计而引入的听觉失真。
In order to realize transparent speech quality parameter speech coding at very low bit rate, a new robust pitch period estimation algorithm is proposed. This algorithm uses an improved calculation method of autocorrelation function, to achieve robust pitch cycle tracking. This algorithm not only tracks fast changing pitch periods, enhances pitch period estimation for irregular pulses, but also robustly estimates steep pitch periods. Informal tests show that this algorithm improves the estimation of pitch period and greatly reduces the auditory distortions introduced due to inaccurate pitch period estimation.