Joint Position-Pitch Tracking for 2-Channel Audio

In this paper, a new representation for acoustic source indexing in a multi-source environment is introduced. Each source is represented by a two-dimensional Gaussian-like probability distribution as a function of pitch and direction-of-arrival (DoA). These features of source candidates form the time dependent Position-Pitch (PoPi) plane, which is extracted from 2-channel audio. For demonstration, the time-evolution of Gaussians corresponding to source candidates are tracked by a Viterbi decoder. The Viterbi tracking is extended to multiple paths and pruning of similar paths using the normalized Levenshtein distance is applied.