SIGNAL DECOMPOSITION, ANALYSIS AND RECONSTRUCTION USING HIGH-RESOLUTION FILTER BANKS AND COMPONENT TRACKING

摘要

A system and method for representing quasi-periodic waveforms, for example, representing a plurality of limited decompositions of the quasi-periodic waveform. Each decomposition includes a first and second amplitude value and at least one time value. In some embodiments, each of the decompositions is phase adjusted such that the arithmetic sum of the plurality of limited decompositions reconstructs the quasi-periodic waveform. Data-structure attributes are created and used to reconstruct the quasi-periodic waveform. Features of the quasi-periodic wave are tracked using pattern-recognition techniques. The fundamental rate of the signal (e.g., heartbeat) can vary widely, for example by a factor of 2-3 or more from the lowest to highest frequency. To get quarter-phase representations of a component (e.g., lowest frequency “rate” component) that varies over time (by a factor of two to three) many overlapping filters use bandpass and overlap parameters that allow tracking the component's frequency version on changing quarter-phase basis.

主权项

1. An apparatus comprising:
a computer having a storage device; a source of an initial series of digitized signal values; a first filter bank that includes a first plurality of digital bandpass filters each operably coupled to the source of digitized signal values and each configured to digitally filter the initial series of digitized signal values, wherein each one of the first plurality of digital bandpass filters has a respective center frequency that is unique among respective center frequencies of the first plurality of digital bandpass filters and a respective frequency range, and wherein each one of the first plurality of digital bandpass filters has an output signal; a first plurality of fractional-phase measurement units that each determines a plurality of amplitude values and a plurality of phase-determined time points per full waveform cycle of the output signal of a corresponding one of the first plurality of digital bandpass filters; and a first frequency-component tracker that uses the plurality of amplitude values from the first plurality of fractional-phase measurement units to detect and track a first tracked frequency component as that first tracked frequency component's frequency moves from one to another frequency range of the first plurality of digital bandpass filters, and to store information regarding the tracked frequency component into the storage device, wherein the stored information includes instantaneous frequency and amplitude of the tracked frequency component at each of a first sequence of time points.