| Paper: | AE-P4.12 | ||
| Session: | Applications to Music | ||
| Time: | Thursday, May 18, 16:30 - 18:30 | ||
| Presentation: | Poster | ||
| Topic: | Audio and Electroacoustics: Applications to Music | ||
| Title: | Frequency Reassignment for Coherent Modulation Filtering | ||
| Authors: | Steven Schimmel, University of Washington, United States; Kelly Fitz, Washington State University, United States; Les Atlas, University of Washington, United States | ||
| Abstract: | Modulation filtering is a technique for filtering slowly-varying envelopes of frequency subbands of a signal, without affecting the signal’s phase and fine-structure. Coherent modulation filtering is a promising subtype of such techniques where subband envelopes are determined through demodulation of the subband signal with a coherently detected subband carrier. In this paper we propose a coherent modulation filtering technique that detects the carriers using the frequency reassignment (FR) operator from time-frequency reassignment. We show how this technique avoids the use of finite differences in the computation of instantaneous frequency (IF), and that it estimates IF more accurately than a past technique as a result. We confirm that the FR-enhanced technique retains the desirable modulation filtering properties (superposition and the preservation of zero-crossings) and show that it performs better on the same single-channel music source separation task than the past technique. | ||
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