PLL-based Pitch Detection and Tracking for Audio Signals
Udo Zölzer, Sujaritha Vettukadu Sankarababu, Stephan Möller · 2012
Pitch detection and tracking can be used for several audio effects, such as time and pitch scaling and the generation of harmonic signals related to the detected fundamental frequency. A variety of audio effects has efficiently been implemented by time-domain processing. Pitch tracking of monophonic audio signals can also be performed by time domain techniques. This paper introduces a novel phase lock loop based frequency demodulator for pitch detection and tracking. We will derive the guidelines for parameters of such a kind of pitch tracker and show performance evaluations for a certain type of input signals. The resulting implementation is suited for producing real-time pitch tracking on simple hardware systems with low computational complexity.