Time-Frequency Cardiac Passive Acoustic Localization
Abstract
In a previous work, the authors have used a novel, radically different approach based on concurrent multi-sensor array measurements and "super-resolution" array processing scheme for phonocardiographic signals. Using a specially designed passive acoustic array, acoustic "images" corresponding to the various distinct phases of the heartbeat were obtained. In this paper, this approach is extended using a novel framework, called Time- Frequency Cardiac Passive Acoustic Localization (TF- CARDIOPAL). The Choi-Williams distribution is utilized - to calculate a spatial time-frequency matrix to - characterize the spatial time-frequency distribution for the nonstationary array signals. Distinctive components of this matrix on the time-frequency plane yield important clues on possible source locations in the heart. This finding has been used in extracting localization information from the first heart sound signals from a - healthy human subject. Meaningful source localization results that are well correlated with the mechanical - activation of the heart are obtained.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 25, 2001
- Accession Number
- ADA409711
Entities
People
- H. O. Gulcur
- Y. Bahadirlar