Method and apparatus for identifying the presence of noise in a time division multiplexed oximeter
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United States of America Patent
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Jul 21, 1998
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N/A
app pub date -
Sep 23, 1996
filing date -
Sep 23, 1996
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Abstract
Noise content in the output signal of a system using time division multiplexing (TDM) is measured to determine whether the output signal represents a reliable measurement. A 'dark' channel in a TDM input signal may be used to isolate noise which is present in the input signal from desired informational content in the signal. The noise is processed to determine if any component of the noise will be 'imaged' into the passband of the system. Any such components are then processed in a manner approximating the system transfer function to produce a noise signal indicative of the noise content of the system output signal. In one embodiment of the invention, the noise signal is used to remove noise from the output signal of the system.
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