从语言信号中提取基频是语言声学中尚未满意解决的一个问题.近年来随着计算技术的发展,相继提出了多种方案,但在准确性和复杂性的矛盾上,仍有待进一步研究.本文提出了一种提取语言信号基频的新方法:用递归数字滤波器搜索和逻辑判决.经过在计算机上的模拟和硬件研制的实践证明,效果很好,合成语言有较好的自然度与可懂度,且硬件简单,适合于通信工程使用. The extraction of fundamental frequency from speech signal is a problem that has not been satisfactorily solved in speech acoustics.In recent years, with the development of computing technology, many schemes have been proposed one after another, but the contradiction between accuracy and complexity remains to be further studied. In this paper, we propose a new method to extract the fundamental frequency of the speech signal: recursive digital filter searching and logic decision, and the result of simulation and hardware development on the computer shows that the method works well and the synthetic language has better natural degree and Understandability, and hardware is simple, suitable for communication engineering.