Patent US3723883A successfully refreshed from Google Patents.
US3723883A
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Automatic noise nulling circuit
Assignee: Individual
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Filing: 1972-02-23
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Granted: 1973-03-27
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Expires: 1992-02-23
Abstract
Abstract An automatic noise nulling circuit for use with a signal transmission system with noise sensed and nulled from the signal path. Noise is nulled out by a null signal input with substantially no distortion of desired signal transmission and without altering the signal transmission characteristics of the signal path through the system.
Inventors
- 👤 D Renner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:43
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
252 words
In an automatic noise nulling circuit used with a signal transmission path system circuit: noise source means; substantially 90* signal phase shift vector resolver means connected for receiving a noise input from said noise source means; a first noise component magnitude adjuster transmission scalar circuit; first signal coupling means coupling a first noise vector signal from said vector resolver means to said first noise component magnitude adjuster transmission scalar circuit; a second noise component magnitude adjuster transmission scalar circuit; second signal coupling means coupling a second noise vector signal from said vector resolver means to said second noise component magnitude adjuster transmission scalar circuit; noise countering signal input means signal connected to said signal transmission path system circuit and signal connected to both said first and second noise component magnitude adjuster transmission scalar circuits; first and second synchronous detector circuits circuit connected for receiving signals from a signal sensing location in said signal transmission path system circuit; first circuit means interconnecting said vector resolver means and said first synchronous detector circuit ; second circuit means interconnecting said vector resolver means and said second synchronous detector circuit ; first voltage value adjusting circuit means interconnecting output means of said first synchronous detector circuit and said first noise component magnitude adjuster transmission scalar circuit; and second voltage value adjusting circuit means interconnecting output means of said second synchronous detector circuit whereby noise is null cancelled from the signal transmission path system with substantially 90* scalar vector inputs automatically magnitude varied with system sensed fEedback.
Claim 2
Dependent Claim
252 words
In an automatic noise nulling circuit used with a signal transmission path system circuit: noise source means; substantially 90* signal phase shift vector resolver means connected for receiving a noise input from said noise source means; a first noise component magnitude adjuster transmission scalar circuit; first signal coupling means coupling a first noise vector signal from said vector resolver means to said first noise component magnitude adjuster transmission scalar circuit; a second noise component magnitude adjuster transmission scalar circuit; second signal coupling means coupling a second noise vector signal from said vector resolver means to said second noise component magnitude adjuster transmission scalar circuit; noise countering signal input means signal connected to said signal transmission path system circuit and signal connected to both said first and second noise component magnitude adjuster transmission scalar circuits; first and second synchronous detector circuits circuit connected for receiving signals from a signal sensing location in said signal transmission path system circuit; first circuit means interconnecting said vector resolver means and said first synchronous detector circuit ; second circuit means interconnecting said vector resolver means and said second synchronous detector circuit ; first voltage value adjusting circuit means interconnecting output means of said first synchronous detector circuit and said first noise component magnitude adjuster transmission scalar circuit; and second voltage value adjusting circuit means interconnecting output means of said second synchronous detector circuit whereby noise is null cancelled from the signal transmission path system with substantially 90* scalar vector inputs automatically magnitude varied with system sensed fEedback.
Claim 3
Dependent Claim
29 words
The automatic noise nulling circuit of claim 1, wherein said noise source means is noise sampling circuit means connected to sample noise from said signal transmission path system circuit.
Claim 4
Dependent Claim
52 words
The automatic noise nulling circuit of claim 2, wherein said signal transmission path system circuit includes, a two wire signal transmission section; and said noise sampling circuit means includes resistive circuit means interconnecting the two wires of said two wire signal transmission section, and a tap connection in said resistive circuit means.
Claim 5
Dependent Claim
49 words
The automatic noise nulling circuit of claim 3, wherein said noise countering signal input means is a transformer with one primary coil and two secondary coils with each of the secondary coils common, respectively, to, and in series with, the two wires of said two wire signal transmission section.
Claim 6
Dependent Claim
18 words
The automatic noise nulling circuit of claim 4, wherein the two transformer secondary coils are balanced value coils.
Claim 7
Dependent Claim
15 words
The automatic noise nulling circuit of claim 4, wherein said transformer is a balanced transformer.
Claim 8
Dependent Claim
41 words
The automatic noise nulling circuit of claim 1, wherein one way signal coupling means is included in the signal path of said single transmission isolating the noise sensing location from the noise countering signal input location in the signal transmission path.
Claim 9
Dependent Claim
30 words
The automatic noise nulling circuit of claim 7, wherein said one way signal coupling means includes a transistor with at least two electrodes series connected in the signal through path.
Claim 10
Dependent Claim
126 words
The automatic noise nulling circuit of claim 1, wherein each of said first and second noise component magnitude adjuster transmission scalar circuits includes: a transformer with a primary coil an active part of said substantially 90* signal phase shift vector resolver and two secondary coils each connected at one end to a voltage potential reference source and interconnected at their other ends by two variable value electronic components having a common junction circuit connected to said noise countering signal input means; and adjustment means circuit connected to one of said synchronous detector circuits and positioned to control two variable value electronic components for increasing the value of one and decreasing the value of the other with change in the output of said synchronous detector connected thereto.
Claim 11
Dependent Claim
69 words
The automatic noise nulling circuit of claim 9, wherein each of said variable value electronic components is a light intensity variable resistor; said adjustment means circuit including a light generator adjacent each of said light intensity variable resistors; and bias control means simultaneously increasing current flow to one light generator and decreasing current flow to another light generator with charge in the output of the synchronous detector connected thereto.
Claim 12
Dependent Claim
26 words
The automatic noise nulling circuit of claim 9, wherein an operational amplifier is included in the circuit path out of each of said synchronous detector circuits.
Claim 13
Dependent Claim
56 words
The automatic noise nulling circuit of claim 11, wherein switch means is included in the circuit path between each of said synchronous detectors and an operational amplifier; and each of said operational amplifiers is designed to hold its output relatively constant for intervals of time that the switch in the circuit input path thereto is opened.
Claim 14
Dependent Claim
26 words
The automatic noise nulling circuit of claim 12, wherein said switch means are mechanical switches interconnected by a switch drive extended from a switch control device.
Claim 15
Dependent Claim
38 words
The automatic noise nulling circuit of claim 12, wherein said switch means includes light controlled resistive switches; individual light means adjacent each of said resistive switches; and with the individual light means circuit connected to switch control means.
Claim 16
Dependent Claim
48 words
The automatic noise nulling circuit of claim 9, wherein said substantially 90* signal phase shift vector resolver also includes an additional coil connected between said Noise source and a primary coil of one of one of said transformers in said first noise component magnitude adjuster transmission scalar circuit.
Claim 17
Dependent Claim
25 words
The automatic noise nulling circuit of claim 1, wherein a phase shift equalizer circuit is included in the feedback circuit connection to said synchronous detectors.
Claim 18
Dependent Claim
20 words
The automatic noise nulling circuit of claim 1 including an amplifier in the feedback circuit connection to said synchronous detectors.
Claim 19
Dependent Claim
26 words
The automatic noise nulling circuit of claim 1, wherein said noise source means is an independent noise source separate from said signal transmission path system circuit.
References Cited (Backward Citations)
US2311696A
Cited
US3409834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |