Method and system for detecting changes in sensor sample...

Details Method and system for detecting changes in sensor sample... Method and system for detecting changes in sensor sample...

2007-04-23

2009-06-30

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Testing system

Of sensing device

Reexamination Certificate

active

07555399

ABSTRACT:
A method detects a change in a stream of samples acquired by a sensor. A stream of samples acquired by a sensor over time is stored sequentially in a buffer in which an oldest samples is discarded and a newest sample is stored when the buffer is full, such that the buffer forms a window of samples sliding forward in time. For each new sample, the buffer is partitioned into all possible pairs of contiguous sub-windows of samples including a first sub-window and a second sub-window such that the newest sample is stored in the second sub-window of the pair. A difference is determined between the first and second sub-window of each pair of the contiguous sub-windows of samples, and a maximum difference is assigned as a merit score. A change in the stream of samples is signaled if the merit score is greater than a predetermine threshold. The change can be abrupt or gradual.

REFERENCES:
patent: 4953386 (1990-09-01), Pearman et al.
patent: 6647343 (2003-11-01), Guthrie et al.
patent: 2007/0097065 (2007-05-01), Kreek et al.
patent: 2007/0103464 (2007-05-01), Kaufman et al.

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