Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Reexamination Certificate
2007-02-27
2007-02-27
Tsai, Carol S. W. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
C702S069000, C324S536000, C363S041000, C348S607000, C348S192000, C704S219000
Reexamination Certificate
active
11183219
ABSTRACT:
Proportional-delayed zero-crossing frequency-drift estimator devices are provided. Given N-number of time samples, the current zero-crossing time estimation technique uses only two zero-crossing time samples for repetition-rate estimation. The term “zero-crossing point” refers to the point where a sinusoidal waveform varies from a positive to a negative value and crosses the zero value in the process. The proportional-delayed zero-crossing frequency-drift estimator devices employ four zero-crossing time samples by utilizing both proportional zero-crossing points for current information and delayed zero-crossing points for past information so that the noises in the time samples will be smoothed out making a less noisy estimation. The proportional-delayed zero-crossing frequency-drift estimators are composed of a hysteretic nonlinear converter, a zero-crossing time-difference counter, a group of shift registers and adders, a repetition-rate algorithm, a reciprocal operator and a means for differentiation operation. A number of different embodiments are provided, but all embodiments include a hysteretic nonlinear converter which enhances the zero-crossing features and blocks the signal random noise so that the zero-crossing point is measured more accurately.
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Kosinski John A.
Su Wei
Tereschuk George B.
The United States of America as represented by the Secretary of
Tsai Carol S. W.
Zelenka Michael
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