Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2000-01-21
2001-09-04
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S379000
Reexamination Certificate
active
06285249
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to the detection and suppression of periodic signals. More specifically, but without limitation thereto, the present invention relates to a circuit for applying stochastic resonance to bias a nonlinear device with a control signal having a selected amplitude, frequency, and phase to enhance or minimize the response of the device to a periodic signal.
The detection of periodic signals can, under certain conditions, be aided by the presence of controlled amounts of background noise in a nonlinear sensor. The mechanism for this type of signal detection is generally referred to as stochastic resonance. Signals are often encountered that are difficult to detect, even if the frequency is known.
In some cases, it may be desirable to remove certain frequencies from a power spectrum. Filtering is often used for this purpose, however filtering may result in complications, such as raising the noise floor in the output power spectral density. In some applications, such as vibration suppression, an active control scheme may be more effective or practical than filtering.
A continued need therefore exists for a way to enhance or remove periodic signals within a power spectrum.
SUMMARY OF THE INVENTION
The present invention is directed to overcoming the problems described above, and may provide further related advantages. No embodiment of the present invention described herein shall preclude other embodiments or advantages that may exist or become obvious to those skilled in the art.
A controlled stochastic resonance circuit of the present invention comprises a bistable electrical device having a voltage response to an input signal frequency that may be enhanced or suppressed by controlling the stochastic resonance of the circuit.
An advantage of the controlled stochastic resonance circuit of the present invention is that system response to an input signal may be enhanced or attenuated by adjusting the amplitude, frequency, and phase of a control signal.
Another advantage is that inherent or artificially introduced noise may be used to enhance or attenuate system response to an input signal.
The features and advantages summarized above in addition to other aspects of the present invention will become more apparent from the description, presented in conjunction with the following drawings.
REFERENCES:
patent: 5579184 (1996-11-01), Nakanishi et al.
patent: 5789954 (1998-08-01), Toppen et al.
patent: 5789961 (1998-08-01), Bulsara et al.
patent: 6020782 (2000-02-01), Albert et al.
patent: 6133770 (2000-10-01), Hasegawa
Bulsara Adi R.
Ditto William
Gammaitoni Luca
Gordon Frank E.
Haenggi Peter
Fendelman Harvey
Lipovsky Peter A.
The United States of America as represented by the Secretary of
Wells Kenneth B.
Whitesell Eric James
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