Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Reexamination Certificate
2006-02-21
2006-02-21
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
C702S195000
Reexamination Certificate
active
07003438
ABSTRACT:
Adaptive noise reduction techniques used in devices that pass light from a laser through a quantum medium such as a rubidium vapor cell. A CPT frequency standard that employs the techniques has a first channel in which the laser light passes through the quantum medium and to a photodetector to produce a first signal and a second channel in which the light passes to a second photodetector without passing through the quantum medium to produce a second signal. The first and second signals are processed in a signal processor to produce an enhanced output signal in which the noise has been reduced. The signal processor implements noise predictor and noise remover. In a preferred embodiment, the noise predictor employs a FIR filter in which the coefficients are set in response to feedback from the enhanced output signal.
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Dowd Andrew Vernon
Levine Martin W.
Gutierrez Anthony
Hoff Marc S.
Kernco, Inc.
Nelson Gordon E.
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