Pitch Period of Speech Signals Introduation, Determination, and Changing

This paper, embarks upon sound processing techniques in the field of pitch determination which is an important factor in this connection. In this discussion , with representation and introduction of four pitch tracking methods, we have studied and compared them. These methods are: time – domain waveform similarity, auto-correlation , AMDF, and frequency domain harmonics’ peaks determination method. In resume, we, finally , will be introduced to pitch changing methods for vocoders use. For this, we will introduce instrumental pitch shifting and modified formant pitch shifting methods and their speciations.