ANALYZE THE PRINCIPALS OF PITCH-SHIFTING

Nowadays, with the development of digital music, more and more digital technologies are used in electronic music. Digital signal processing is one of the most powerful technologies that will shape science and engineering in the twenty-first century [1]. Pith shifting, as one of the most important processing, always plays significant role in the whole digital system. This paper introduces some basic knowledge about pitch-shifting like the development and working principles. After that, the paper introduces some different methods to produce the pitch-shifting effect. And then it will mainly introduce the time-stretching approach and explain the principals. The main objective of this written review is to illustrate the principals of pith shifting and different approaches to produce it. Finally, it stress on some problems we need to overcome during pitch shifting.