US3758868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise-riding slicer
Assignee: United States Department of the Navy
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Filing: 1971-12-21
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Granted: 1973-09-11
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Expires: 1991-12-21
Abstract
Abstract A noise-slicing device for substantially eliminating the noise from an input signal consisting of signal pulses riding in a background of noise. The input signal is fed through an electronic attenuator into an output comparator which provides an output whenever its input-signal level is above a reference voltage, 2 Vref. A feedback loop provides a control signal to the attenuator to automatically control the attenuation level. The input to the feedback loop is the output of the attenuator. The loop comprises comparator means providing an output when the attenuator output signal is above its reference voltage, Vref, a one-shot multivibrator, summing means having -Vref as one input and the M-V output as the other, an integrator and a limiter, the attenuator control signal being the output of the integrator.
Inventors
- 👤 B Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/01; H03K3/013
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
220 words
A noise-slicing device for automatically substantially eliminating the noise impulses from an input signal applied thereto consisting of signal pulses in a background of noise impulses comprising, in comination: electronic attenuator means for attenuating its own input signal in accordance with the magnitude of a control signal, said input signal and control signal being applied as inputs thereto; feedback means connected to receive the output of said attenuator means as a first input signal and a reference voltage as a second input signal, for converting the output signal of said attenuator means into said control signal for said attenuator means, said feedback means acting to maintain a fixed difference between said reference voltage level and the peak noise level of the output signal from said attenuator means; output comparator means connected to receive the output of said attenuator means as a first input signal and having a second reference voltage as a second input signal for comparing the voltage levels of its two input signals and providing an output pulse whenever the voltage of its first input signal rises above the level of said second reference voltage, said second reference voltage level being substantially above the peak amplitudes of the noise impulses but below the peak amplitudes of the signal pulses in the input signal received by the noise-slicing device.
Claim 2
Dependent Claim
220 words
A noise-slicing device for automatically substantially eliminating the noise impulses from an input signal applied thereto consisting of signal pulses in a background of noise impulses comprising, in comination: electronic attenuator means for attenuating its own input signal in accordance with the magnitude of a control signal, said input signal and control signal being applied as inputs thereto; feedback means connected to receive the output of said attenuator means as a first input signal and a reference voltage as a second input signal, for converting the output signal of said attenuator means into said control signal for said attenuator means, said feedback means acting to maintain a fixed difference between said reference voltage level and the peak noise level of the output signal from said attenuator means; output comparator means connected to receive the output of said attenuator means as a first input signal and having a second reference voltage as a second input signal for comparing the voltage levels of its two input signals and providing an output pulse whenever the voltage of its first input signal rises above the level of said second reference voltage, said second reference voltage level being substantially above the peak amplitudes of the noise impulses but below the peak amplitudes of the signal pulses in the input signal received by the noise-slicing device.
Claim 3
Dependent Claim
182 words
A noise-slicing device as in claim 1, wherein said feedback means comprises: means providing a fixed reference voltage; feedback voltage comparator means having as input signals the output of said attenuator means and said reference voltage, said comparator means providing a fixed-amplitude output voltage whenever the level of the attenuator output signal rises above the level of said reference voltage; means, receiving the output of said comparator means as an input, for providing for a fixed period a fixed-level output signal when triggered by a signal at itS input, said fixed period covering the time duration of several noise impulses but being less than the period of the signal pulses coming into the noise-slicing device; inverter means, receiving as an input said fixed reference voltage, for inverting the polarity of said reference voltage; summing means, receiving as inputs the output of said MV means and said inverter means, for adding its two input voltages; and integrator means, receiving the output of said summing means as an input, for integrating its input signal and providing said control signal for said electronic attenuator means.
Claim 4
Dependent Claim
38 words
A noise-slicing device as in claim 2, further including limiter means, receiving the output of said integrator means as an input, for limiting the peak amplitude of said control signal before it is applied to said attenuator means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |