Digital Implementation of Vibrato

Digital Audio Effects are often discussed in audio production circles by their acoustical effect on an input signal [1]. As opposed to discussing what is happening acoustically, this report aims to delve deeper into the DSP (Digital Signal Processing) algorithms underlying an effect to explain how it is being created. The focus of this report is on the digital implementation of a vibrato effect. After a short introduction outlining what vibrato is and how it has classically been achieved in the analog domain, a more in depth analysis of how vibrato can be achieved digitally is presented. This analysis focuses on furthering an understanding of what a time-delay based effect is and the parameters used to control such effects, especially the influence of a low frequency oscillator (LFO) for modulating delay time.