Variable sensing using frequency domain
First Claim
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1. An apparatus for monitoring a system responsive to application of a stimulus, the apparatus comprising:
- a memory for storing data;
an input channel for sensory input;
a processor connected to the memory and the input channel, the processor programmed to;
receive the sensory input from the input channel as a sequential stream of data samples in a time domain wherein the sensory input is responsive to application of the stimulus to the system;
convert the sequential stream of data samples from the time domain to a frequency domain using a Fourier transform to obtain a plurality of complex Fourier coefficients;
apply a respective weighting factor to a magnitude of each complex Fourier coefficient to generate weighted magnitudes, each weighting factor based on a relative impact that a particular frequency associated with the magnitude has on the system; and
calculate an exposure value for the system responsive to application of the stimulus using the weighted magnitudes;
an output channel connected to the processor for transmitting an output of the processor external of the apparatus.
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Abstract
Embodiments of a method and apparatus for variable sensing using the frequency domain are taught herein. An exposure of a system to a physical variable is determined by periodically sensing the physical variable to produce a plurality of digital samples. The plurality of digital samples is converted to respective frequency domain representations. The exposure is calculated using the frequency domain representations.
12 Citations
20 Claims
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1. An apparatus for monitoring a system responsive to application of a stimulus, the apparatus comprising:
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a memory for storing data; an input channel for sensory input; a processor connected to the memory and the input channel, the processor programmed to; receive the sensory input from the input channel as a sequential stream of data samples in a time domain wherein the sensory input is responsive to application of the stimulus to the system; convert the sequential stream of data samples from the time domain to a frequency domain using a Fourier transform to obtain a plurality of complex Fourier coefficients; apply a respective weighting factor to a magnitude of each complex Fourier coefficient to generate weighted magnitudes, each weighting factor based on a relative impact that a particular frequency associated with the magnitude has on the system; and calculate an exposure value for the system responsive to application of the stimulus using the weighted magnitudes; an output channel connected to the processor for transmitting an output of the processor external of the apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of monitoring a system responsive to application of a stimulus, the method comprising:
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receiving the sensory input from an input channel connected to a processor as a sequential stream of data samples in a time domain wherein the sensory input is responsive to application of the stimulus to the system; using the processor to convert the sequential stream of data samples from the time domain to a frequency domain using a Fourier transform to obtain a plurality of complex Fourier coefficients; applying a respective weighting factor to a magnitude of each complex Fourier coefficient to generate weighted magnitudes, each weighting factor based on a relative impact that a particular frequency associated with the magnitude has on the system; and calculating, using the processor, an exposure value for the system responsive to application of the stimulus using the weighted magnitudes. - View Dependent Claims (19, 20)
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Specification