In recent years speech processing studies, lead substantial developments at speech recognition, obtaining speaker feelings and speaker recognition. Each of these branches requires determination of accurate fundamental frequency of speech. Improvements achieved at fundamental frequency determination will be beneficial to development of all above-mentioned speech processing applications. There are numerous methods have been developed to find fundamental frequency of speech. Cepstrum and autocorrelation procedures are commonly used methods. In this study those methods theoretical background will be explained and performed fundamental frequency analysis results will be shared.