Patent US5457811A successfully refreshed from Google Patents.
US5457811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling signal level at both ends of a transmission sink based on a detected value
Assignee: AT&T Labs Inc
•
Filing: 1994-06-13
•
Granted: 1995-10-10
•
Expires: 2014-06-13
Abstract
Abstract The present invention is directed to a dynamic range enhancing system for increasing the dynamic range of a transmission link, and also to a process for increasing the dynamic range of a transmission link. An instruction setting process is also provided for defining a set of instructions, for a control device of the system, which detects, at an initial position along the transmission link, the level of a transmit signal adapted to be transmitted over the transmission link. The control device controls a first signal level changing device and a second signal level changing device in response to the detected level. The first and second signal level changing devices, respectively, process the transmit signal level before and after transmission over the link.
Inventors
- 👤 Paul H. Lemson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:12
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3084; H03G3/3052; H04; H04J; H04J14/00; H04J14/02; H04J14/0298
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
317 words
A system for controlling the amount of noise introduced into a transmit signal adapted to be transmitted over a transmission link within a communication path, the transmission link extending from a first location to a second location remote from the first location, said system comprising: control means for detecting, at an initial position along the communication path, a level of the transmit signal, and for controlling first signal level changing means and second signal level changing means in response to the detected level, wherein said initial position is before said link; said first signal level changing means comprising means for changing the level of said transmit signal between said initial position and first location, the transmit signal then being transmitted over said link, and said second signal level changing means comprising means for changing the level of said transmit signal after said transmit signal has passed said second location at the remote end of said link, said control means controlling said first and second signal level changing means to change the level of said transmit signal in a coordinated fashion based on the detected level; said first and second signal level changing means respectively comprising first and second outputs and means for changing the level of the transmit signal present at said first and second outputs; and said first and second signal level changing means each comprising means for changing the level of the transmit signal, at said first and second outputs, within defined signal level changing ranges and respective means for setting said first and second signal level changing means to be at an end of said defined signal level changing ranges, whereby each of said first and second signal level changing means increases or decreases the level of the transmit signal at respective first and second outputs by a maximum change in value when set at an end of said defined signal level changing range.
Claim 2
Independent Claim
317 words
A system for controlling the amount of noise introduced into a transmit signal adapted to be transmitted over a transmission link within a communication path, the transmission link extending from a first location to a second location remote from the first location, said system comprising: control means for detecting, at an initial position along the communication path, a level of the transmit signal, and for controlling first signal level changing means and second signal level changing means in response to the detected level, wherein said initial position is before said link; said first signal level changing means comprising means for changing the level of said transmit signal between said initial position and first location, the transmit signal then being transmitted over said link, and said second signal level changing means comprising means for changing the level of said transmit signal after said transmit signal has passed said second location at the remote end of said link, said control means controlling said first and second signal level changing means to change the level of said transmit signal in a coordinated fashion based on the detected level; said first and second signal level changing means respectively comprising first and second outputs and means for changing the level of the transmit signal present at said first and second outputs; and said first and second signal level changing means each comprising means for changing the level of the transmit signal, at said first and second outputs, within defined signal level changing ranges and respective means for setting said first and second signal level changing means to be at an end of said defined signal level changing ranges, whereby each of said first and second signal level changing means increases or decreases the level of the transmit signal at respective first and second outputs by a maximum change in value when set at an end of said defined signal level changing range.
Claim 3
Dependent Claim
23 words
The system of claim 1, wherein said system further comprises time delay means to compensate for time delays caused by said control means.
Claim 4
Dependent Claim
22 words
The system of claim 1, wherein said system further comprises service channel transmission means for conducting maintenance communication across said transmission link.
Claim 5
Dependent Claim
23 words
The system of claim 1, wherein said control means further comprises a time division multiplexed (TDM) or frequency division multiplexed (FDM) control interface.
Claim 6
Dependent Claim
72 words
The system of claim 1, wherein said control means comprises a plurality of controllers, said first signal level changing means comprises a first set of signal level modifiers, and said second signal level changing means comprises a second set of signal level modifiers, and further wherein each of said controllers and modifiers is adapted to separately and independently provide transmission link performance enhancement for respective separate frequency bands of said transmit signal.
Claim 7
Dependent Claim
19 words
The system of claim 5, wherein said first and second sets of signal level modifiers are identical in number.
Claim 8
Dependent Claim
52 words
The system of claim 5, wherein said system comprises a respective filter for each of said separate frequency bands of said transmit signal, and further wherein the system comprises a combining network connected to the input of said transmission link and a splitting network connected to the output of said transmission link.
Claim 9
Dependent Claim
13 words
The system of claim 1, wherein said transmission link comprises an optical link.
Claim 10
Dependent Claim
46 words
The system of claim 1, wherein said control means comprise means for producing first and second control signals to respectively control said first and second signal level changing means, said second control signal being transmitted over said transmission link and comprising an FM/FSK control signal modulator.
Claim 11
Dependent Claim
28 words
The system of claim 1, wherein said system further comprises an upward frequency converter for converting said transmit signal to a higher frequency after transmission over said link.
Claim 12
Independent Claim
282 words
A system for controlling the amount of noise introduced into a transmit signal adapted to be transmitted over a transmission link within a communication path, the transmission link extending from a first location to a second location remote from the first location, said system comprising: control means for detecting, at an initial position along the communication path, a level of the transmit signal, and for controlling first signal level changing means and second signal level changing means in response to the detected level, wherein said initial position is before said link; said first signal level changing means comprising means for changing the power level of said transmit signal between said initial position and said first location, the transmit signal then transmitted over said link, and said second signal level changing means comprising means for changing the level of said transmit signal after said transmit signal has passed said second location at the remote end of said link, said control means controlling said first and second signal level changing means to change the level of said transmit signal in a coordinated fashion based on the detected level; said first and second signal level changing means respectively comprising first and second outputs and means for changing the level of the transmit signal present at said first and second outputs; and said control means comprising means for controlling said first and second signal level changing means so that: the transmit signal level is decreased at the first output and increased at the second output when the detected transmit signal level increases, and the transmit signal level is increased at the first output and decreased at the second output when the detected transmit signal level decreases.
Claim 13
Independent Claim
282 words
A system for controlling the amount of noise introduced into a transmit signal adapted to be transmitted over a transmission link within a communication path, the transmission link extending from a first location to a second location remote from the first location, said system comprising: control means for detecting, at an initial position along the communication path, a level of the transmit signal, and for controlling first signal level changing means and second signal level changing means in response to the detected level, wherein said initial position is before said link; said first signal level changing means comprising means for changing the power level of said transmit signal between said initial position and said first location, the transmit signal then transmitted over said link, and said second signal level changing means comprising means for changing the level of said transmit signal after said transmit signal has passed said second location at the remote end of said link, said control means controlling said first and second signal level changing means to change the level of said transmit signal in a coordinated fashion based on the detected level; said first and second signal level changing means respectively comprising first and second outputs and means for changing the level of the transmit signal present at said first and second outputs; and said control means comprising means for controlling said first and second signal level changing means so that: the transmit signal level is decreased at the first output and increased at the second output when the detected transmit signal level increases, and the transmit signal level is increased at the first output and decreased at the second output when the detected transmit signal level decreases.
Claim 14
Dependent Claim
13 words
The system of claim 11, wherein said transmission link comprises an optical link.
Claim 15
Dependent Claim
72 words
The system of claim 11, wherein said control means comprises a plurality of controllers, said first signal level changing means comprises a first set of signal level modifiers, and said second signal level changing means comprises a second set of signal level modifiers, and further wherein each of said controllers and modifiers is adapted to separately and independently provide transmission link performance enhancement for respective separate frequency bands of said transmit signal.
Claim 16
Dependent Claim
19 words
The system of claim 13, wherein said first and second sets of signal level modifiers are identical in number.
Claim 17
Dependent Claim
52 words
The system of claim 13, wherein said system comprises a respective filter for each of said separate frequency bands of said transmit signal, and further wherein the system comprises a combining network connected to the input of said transmission link and a splitting network connected to the output of said transmission link.
Claim 18
Dependent Claim
179 words
The system of claim 1, wherein said control means comprises means for controlling said first signal level changing means to decrease the level of the transmit signal present at said first output by an amount approximately equal to the amount by which said detected level exceeds a first threshold value, when said detected level is above said first threshold value; wherein said control means comprise means for concurrently controlling said second signal level changing means to increase the level of the transmit signal present at said second output by an amount approximately equal to the amount by which said detected level exceeds said first threshold value, when said detected level is above said first threshold value; and wherein said control means comprise means for controlling said second signal level changing means to be at the most increased end of said defined signal level changing range, whereby the signal level present at its output is at a maximum possible value, when said detected level of said transmit signal is above a second threshold which is greater than said first threshold.
References Cited (Backward Citations)
US3456191A
Cited
US3444469A
Cited
US3619786A
Cited
US4004224A
Cited
US3912946A
Cited
US4169219A
Cited
US4188587A
Cited
US4270222A
Cited
JPS5639641A
Cited
US4355304A
Cited
US4482973A
Cited
US4476573A
Cited
US4545075A
Cited
US4457020A
Cited
US4553105A
Cited
US4531234A
Cited
US4658296A
Cited
JPS6035844A
Cited
US4722081A
Cited
US4665560A
Cited
US4769853A
Cited
US4654891A
Cited
US4754495A
Cited
US4910791A
Cited
US4859964A
Cited
US4811423A
Cited
US4772956A
Cited
US4849711A
Cited
US4893300A
Cited
US4947459A
Cited
US5067147A
Cited
US5321849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |