Estimation of multiple pitches in stereophonic mixtures using a codebook-based approach

Abstract

In this paper, a method for multi-pitch estimation of stereophonic mixtures of multiple harmonic signals is presented. The method is based on a signal model which takes the amplitude and delay panning parameters of the sources in a stereophonic mixture into account. Furthermore, the method is based on the extended invariance principle (EXIP), and a codebook of realistic amplitude vectors. For each fundamental frequency candidate in each of the sources, the amplitude estimates are mapped to entries in the codebook, and the pitch and model order are estimated jointly. The performance of the proposed method is evaluated using mixtures of real signals. Experiments show an increase in performance when knowledge about the panning parameters is utilized together with the codebook of magnitude amplitudes when compared to a state-of-the-art transcription method.

Estimation of Fundamental Frequencies in Stereophonic Music Mixtures

“…In this way, the fundamental frequencies of harmonic sources with overlapping harmonics can be resolved. This paper extends our previous work, presented in [38], where a method for stereophonic multi-pitch estimation is presented. The paper is related to the work presented in [39], where a codebook-based approach for multi-pitch estimation of single-channel sources was proposed.…”

“…In the preliminary work presented in [38], [39], it was assumed that the number of active sources M in a frame was known a priori. However, this is often not the case, e.g., in mixtures of recordings of several musicians playing together.…”