Abstract: Extraction of the fundamental frequency from the speech signal is a problem which has not been solved with great satisfaction. Although various schemes have successively been proposed along with the development of computing technique, the contradiction between accuracy and complexity remains to be solved.
This paper suggests a new method which utilizes recursive digital filters and associative de-cision logic to search and trace the fundamental frequency. It is enough to prove that the result is good by means of the simulation in computer and the real-time special purpose hardware. Synthetic speech intelligibility and naturalness are both quite satisfactory. Moreover, hardware is simple. Thus it can be adapted in communication engineering.