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本文提出了一个新的线性相位三路滤波器系统,该系统实现了数字化音调控制。这种滤波器系数的数值大约有80%都等于零,其余的非零系数的数值分别等于0.5和0.25。因此,这个滤波器系统实质上不用乘法。当高频增益量和低频增益量为1时,这个滤波器系统是无频率响应失真的纯延时系统。
This paper presents a new linear phase three-path filter system that implements digital pitch control. About 80% of the filter coefficients are equal to zero, and the remaining nonzero coefficients are equal to 0.5 and 0.25, respectively. Therefore, this filter system is essentially free of multiplication. When the amount of high frequency gain and low frequency gain is 1, this filter system is a pure delay system without frequency response distortion.