Signal repetition-rate and frequency-drift estimator using...

Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing

Reexamination Certificate

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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.

REFERENCES:
patent: 6285310 (2001-09-01), Michaelis et al.
patent: 6594595 (2003-07-01), Yamaguchi et al.
patent: 7085949 (2006-08-01), Mar et al.
patent: 2002/0016711 (2002-02-01), Manjunath et al.
patent: 2002/0099548 (2002-07-01), Manjunath et al.
patent: 2003/0018442 (2003-01-01), Yamaguchi et al.
patent: 2004/0102969 (2004-05-01), Manjunath et al.
patent: 2004/0107376 (2004-06-01), Mar et al.

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