Frequency envelope detection method for signal analysis

Details Frequency envelope detection method for signal analysis Frequency envelope detection method for signal analysis

2006-08-02

2009-12-15

Charioui, Mohamed (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

Reexamination Certificate

active

07634387

ABSTRACT:
A signal which varies over time is monitored to determine an alarm condition, where the sample stream of digital values from an A/D converter is divided in to equal length pieces and a Fourier Transform (FT) algorithm is used to transform each piece of the stream into a three dimensional dataset including frequency domain amplitude, frequency and time. A Frequency Envelope is calculated by taking the maxima over the time dimension for a period of time, leaving a two dimensional frequency domain amplitude vs frequency dataset which is compared with new data arriving to determine the alarm condition for each element of the Frequency Envelope either by applying a constant delta additively or multiplicatively or by using a “leaky bucket” algorithm.

REFERENCES:
patent: 3838408 (1974-09-01), McMaster
patent: 4433328 (1984-02-01), Saphir et al.
patent: 6215408 (2001-04-01), Leonard et al.
patent: 7230711 (2007-06-01), Hovde

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