In certain applications, such as speech analysis-synthesis, noise suppression and enhancement, it may be necessary to extract some key properties of the original signal like voiced, unvoiced or noise speech sounds, using specific digital signal processing algorithms.performance of such systems, such as speech coding, speech analysis, speech synthesis, automatic speech recognition, noise suppression and enhancement, pitch detection, speaker identification, and the recognition of speech pathologies depends on the ability of the system to detect correct voiced/unvoiced/silence speech segments.