Device noise reduction of speech signals are designed to improve speech recognition systems and hearing aids. In Acoustic sound system technology has spread widely Noise Gate. Technology Noise Gate, being invariant to mean spectrum of the input signal does not include the features of the speech signal, which limits its application. This feature consists that the spectrum of the speech signal has periodic components for the voiced parts of speech. The frequency of the speech signal allows the use of an agreed comb filter to separate the signal from the mixture with noise. This paper focuses on the development of the method of the digital comb filter (СF) for noise suppression in speech signal.