US3619794A
Expired / Lapsed
US
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Method and system for detecting noise-containing signals
Assignee: Individual
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Filing: 1970-02-13
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Granted: 1971-11-09
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Expires: 1990-02-13
Abstract
Abstract This invention concerns detectors or rectifiers which are insensitive to superimposed noise, as well as to DC and varying DC signals. The detectors of this invention provide insensitivity to higher-order time functions by gating with different gain factors the successive half-cycles, or successive groups of halfcycles, in the input AC signal, the AC value of which it is desired to detect. The insensitivity can be extended as well to sums of higher-order time functions. The invention is particularly adapted to high-speed AC measurements in situations whose characteristics include noise, drift, or ''''drool'''' phenomena.
Inventors
- 👤 Peter L Richman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:18
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/02; H03D1/04
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
115 words
A method of performing gated rectification of an input AC signal to obtain therefrom a DC output signal, said AC signal being affected by certain characteristics, said method including the steps of: providing a reference AC signal whose frequency is related to the frequency of said input AC signal; selecting a sequence of at least three groups of half-cycles from said reference AC signal, each group including at least one half-cycle of said reference signal, and each half-cycle having a distinct factor associated therewith; generating gating signals from said groups of half-cycles; and performing said gated rectification with said gated signals thereby rendering said output DC signal substantially independent of selected ones of said characteristics.
Claim 2
Independent Claim
115 words
A method of performing gated rectification of an input AC signal to obtain therefrom a DC output signal, said AC signal being affected by certain characteristics, said method including the steps of: providing a reference AC signal whose frequency is related to the frequency of said input AC signal; selecting a sequence of at least three groups of half-cycles from said reference AC signal, each group including at least one half-cycle of said reference signal, and each half-cycle having a distinct factor associated therewith; generating gating signals from said groups of half-cycles; and performing said gated rectification with said gated signals thereby rendering said output DC signal substantially independent of selected ones of said characteristics.
Claim 3
Dependent Claim
44 words
The method of claim 1 in which, said characteristics are expressible in the form of a time power series having terms a+bt+ct2+dt3+et4+....., where t is time, and each of the coefficients a, b, c, d, and e is finite, zero, or any combination thereof.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said reference AC signal is a periodic signal.
Claim 5
Dependent Claim
14 words
The method of claim 3 wherein said reference AC signal is a sinusoidal signal.
Claim 6
Dependent Claim
23 words
The method of claim 3 wherein, the period of said input AC signal is equal to the period of said reference AC signal.
Claim 7
Dependent Claim
63 words
The method of claim 1 wherein, said reference AC signal is a periodic signal having a period equal to the period of said input AC signal; and said characteristics are expressible in the form of a time power series a+bt+ct2+dt3+et4+....., where t is time, and each of the coefficients a, b, c, d, and e may be finite, zero, or any combination thereof.
Claim 8
Dependent Claim
36 words
The method of claim 6 wherein, said half-cycles have successive gain factors of 1, -2, 1, and 0, thereby eliminating the effects on the output DC signal which are contributed by the a and bt terms.
Claim 9
Dependent Claim
38 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of 0, 1, -2, and 1, thereby eliminating the effects on the output DC signal which are contributed by the a and bt terms.
Claim 10
Dependent Claim
39 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of 1, -3, 3, and -1, thereby eliminating the effects on the output DC signal which are contributed by the a, bt and ct2 terms.
Claim 11
Dependent Claim
39 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of -1, 3, -3, and 1, thereby eliminating the effects on the output DC signal which are contributed by the a, bt and ct2 terms.
Claim 12
Dependent Claim
40 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of 1, -2, 1, -1, 2, and -1, thereby eliminating the effect on the output DC signal which are contributed by the a and bt terms.
Claim 13
Dependent Claim
40 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of -1, 2, -1, 1, -2, and 1, thereby eliminating the effects on the output DC signal which are contributed by the a and bt terms.
Claim 14
Dependent Claim
42 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of 1, -4, 6, -4, 1, and 0, thereby eliminating the effect on the output DC signal which are contributed by the a, bt, ct2, and dt3 terms.
Claim 15
Dependent Claim
42 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of 0, 1, -4, 6, -4, and 1, thereby eliminating the effects on the output DC signal which are contributed by the a, bt, ct2, and dt3 terms.
Claim 16
Dependent Claim
43 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of 1, -5, 10, -10, 5, and -1, thereby eliminating the effects on the output DC signal which are contributed by the a, bt, ct2, dt3, and et4 terms.
Claim 17
Dependent Claim
43 words
The method of claim 6 wherein, said groups of half-cycles have successive gain factors of -1, 5, -10, 10, -5, and 1, thereby eliminating the effects on the output DC signal which are contributed by the a, bt, ct2, dt3, and et4 terms.
Claim 18
Independent Claim
189 words
A system for performing gated rectification of an input AC signal to obtain therefrom an output DC signal, said AC signal being affected by certain characteristics, said system comprising: a first terminal for receiving a reference AC signal whose frequency is related to the frequency of said input AC signal; first means coupled to said first terminal for deriving from said reference signal a sequence of at least three groups of half-cycles, each group including at least one half-cycle of said reference signal, and each half-cycle having a distinct gain factor associated therewith; gate generating means coupled to said first means for generating gating signals from said groups of half-cycles; an input terminal for receiving said input AC signals; gated signal rectifier means having first, second, and third terminals; gain-control means coupled between said input terminal and said first terminal of said rectifier means; and means applying said gating signal to said second terminal of said rectifier means thereby causing said rectifier means to perform said gated rectification, whereby said output DC signal which is obtained from said third terminal is substantially independent of selected ones of said characteristics.
Claim 19
Independent Claim
189 words
A system for performing gated rectification of an input AC signal to obtain therefrom an output DC signal, said AC signal being affected by certain characteristics, said system comprising: a first terminal for receiving a reference AC signal whose frequency is related to the frequency of said input AC signal; first means coupled to said first terminal for deriving from said reference signal a sequence of at least three groups of half-cycles, each group including at least one half-cycle of said reference signal, and each half-cycle having a distinct gain factor associated therewith; gate generating means coupled to said first means for generating gating signals from said groups of half-cycles; an input terminal for receiving said input AC signals; gated signal rectifier means having first, second, and third terminals; gain-control means coupled between said input terminal and said first terminal of said rectifier means; and means applying said gating signal to said second terminal of said rectifier means thereby causing said rectifier means to perform said gated rectification, whereby said output DC signal which is obtained from said third terminal is substantially independent of selected ones of said characteristics.
Claim 20
Dependent Claim
33 words
The system of claim 17 wherein, said gain-control means includes switching means, and means coupled between said gate-generating means and said switching means to operate said switching means, thereby controlling said gain factors.
Claim 21
Dependent Claim
31 words
The system of claim 18 wherein, said gate-generating means includes: a pulse generator, at least two flip-flops connected in series, and a plurality of NAND gates for shaping said gating signals.
Claim 22
Dependent Claim
14 words
The system of claim 19 wherein said reference AC signal is a sinusoidal signal.
Claim 23
Dependent Claim
63 words
The system of claim 19 in which, said reference AC signal is a periodic signal having a period equal to the period of said input AC signal; and said characteristics are expressible in the form of a power series a+bt+ct2+dt3+et4+....., where t is time and each of the coefficients a, b, c, d, and e may be finite, zero, or any combination thereof.
Claim 24
Dependent Claim
14 words
The system of claim 19 wherein said reference AC signal is a periodic signal.
Claim 25
Dependent Claim
23 words
The system of claim 22 wherein the period of said input AC signal is equal to the period of said reference AC signal.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |