Methods of detecting RF interference in breath ethanol testing
First Claim
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1. A method for detecting electro-magnetic interference corrupting a signal from a breath alcohol sensor, said method comprising:
- receiving the signal from the breath alcohol sensor;
differentiating the signal to generate a differentiated signal;
comparing the differentiated signal to a predefined threshold for a time rate of change range; and
determining that an interference corrupting event is detected if the time rate of change is outside the respective predetermined range.
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Abstract
Interference detector and methods for detecting interference in a signal are described. More specifically, in one aspect, a method for detecting interference in a signal is provided. The method comprises determining whether the signal has at least one of a time and a frequency characteristic that is outside a predefined range, and determining that an interference event has been detected if the signal has at least one of such characteristics.
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Citations
14 Claims
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1. A method for detecting electro-magnetic interference corrupting a signal from a breath alcohol sensor, said method comprising:
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receiving the signal from the breath alcohol sensor; differentiating the signal to generate a differentiated signal; comparing the differentiated signal to a predefined threshold for a time rate of change range; and determining that an interference corrupting event is detected if the time rate of change is outside the respective predetermined range. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. A method for detecting electro-magnetic interference corrupting a signal received from a breath alcohol sensor including a fuel cell, the method comprising:
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receiving the signal from the breath alcohol sensor; transforming the signal from a time domain signal to a frequency domain signal; and processing the frequency domain signal to determine whether any frequency component present is outside a predefined range; and determining that an interference corrupting event is detected if the frequency component present is outside the predefined range. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification