Instantaneous Frequency and Amplitude Estimation in Multicomponent Signals Using an EM-Based Algorithm

• Published in: IEEE transactions on signal processing Vol. 72; pp. 1130 - 1140
• Main Authors: Legros, Quentin, Fourer, Dominique, Meignen, Sylvain, Colominas, Marcelo A.
• Format: Journal Article
• Language: English
• Published: New York IEEE 2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Amplitudes; Bayes methods; Bayesian estimation; Estimation; expectation-maximization algorithm; Frequency estimation; Mathematical models; Monte Carlo sampling; Parameter estimation; Ridge extraction; Signal processing algorithms; Spectrogram; time-frequency; Time-frequency analysis
• ISSN: 1053-587X; 1941-0476; 1941-0476
• DOI: 10.1109/TSP.2024.3361713

This paper addresses the problem of estimating the instantaneous frequency (IF) and amplitude of the modes composing a non-stationary multicomponent signal in the presence of noise. A novel observation model for the signal spectrogram is developed within a Bayesian framework to handle intricate configurations involving noise or overlapping components. The model parameters are estimated using a stochastic variant of the Expectation-Maximization algorithm, bypassing the computationally expensive joint parameter estimation from the posterior distribution. We then design an algorithm for instantaneous amplitude and frequency estimation that accounts for overlap and amplitude variations of the components. To assess the performance of the proposed method, we conduct experiments on both real-world and simulated signals, involving separated or crossing modes. The benefits of our method in terms of efficiency compared with several state-of-the art techniques appear to be significant in that latter case, but also when the amplitude of the components are varying across time.