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Graph Cepstrum: Spatial Feature Extracted from Partially Connected Microphones

Keisuke IMOTO

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Summary :

In this paper, we propose an effective and robust method of spatial feature extraction for acoustic scene analysis utilizing partially synchronized and/or closely located distributed microphones. In the proposed method, a new cepstrum feature utilizing a graph-based basis transformation to extract spatial information from distributed microphones, while taking into account whether any pairs of microphones are synchronized and/or closely located, is introduced. Specifically, in the proposed graph-based cepstrum, the log-amplitude of a multichannel observation is converted to a feature vector utilizing the inverse graph Fourier transform, which is a method of basis transformation of a signal on a graph. Results of experiments using real environmental sounds show that the proposed graph-based cepstrum robustly extracts spatial information with consideration of the microphone connections. Moreover, the results indicate that the proposed method more robustly classifies acoustic scenes than conventional spatial features when the observed sounds have a large synchronization mismatch between partially synchronized microphone groups.

Publication
IEICE TRANSACTIONS on Information Vol.E103-D No.3 pp.631-638
Publication Date
2020/03/01
Publicized
2019/12/09
Online ISSN
1745-1361
DOI
10.1587/transinf.2019EDP7162
Type of Manuscript
PAPER
Category
Speech and Hearing

Authors

Keisuke IMOTO
  Ritsumeikan University

Keyword