US5144267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable slope network for off-premises CATV system
Assignee: Rateze Remote Mgmt LLC
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Filing: 1990-11-28
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Granted: 1992-09-01
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Expires: 2010-11-28
Abstract
Abstract A three terminal compensation network for frequency dependent attenuation has a control terminal, an input terminal, and an output terminal. The network is particularly useful for an off-premises CATV system for slope compensation of a broadband television signal. The control terminal is supplied with a voltage indicative of the amount and direction of the slope in the actual television signal. The voltage oppositely biases a set of diodes which are used as controlled resistances in a pair of tuned circuits in the network. One series tuned circuit provides for varying degrees of negative slope compensation and a parallel tuned circuit provides for varying degrees of positive slope compensation. The network elements are connected in a modified bridge T configuration such that the characteristic impedance of the CATV system (75 ohms) can be approximately matched for the input and output of the broadband television signal.
Inventors
- 👤 Lamar E. West, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:57
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/166; H04N7/10; H04N7/102
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
138 words
A controlled compensation network having an input terminal and an output terminal comprising: an impedance connected between the input terminal of the network and a junction node; an impedance connected between said junction node and the output terminal; a bridge impedance connected between the input terminal and the output terminal comprising the series combination of a first controlled resistance connected in parallel with a first impedance and a second controlled resistance connected in parallel with a second impedance; a shunt impedance connected between said junction terminal and ground comprising the parallel combination of a third controlled resistance connected in series with a third impedance and a fourth controlled resistance connected in series with a fourth impedance; and means for controlling the resistances of said first and third resistances in the opposite direction to said second and fourth resistances.
Claim 2
Dependent Claim
138 words
A controlled compensation network having an input terminal and an output terminal comprising: an impedance connected between the input terminal of the network and a junction node; an impedance connected between said junction node and the output terminal; a bridge impedance connected between the input terminal and the output terminal comprising the series combination of a first controlled resistance connected in parallel with a first impedance and a second controlled resistance connected in parallel with a second impedance; a shunt impedance connected between said junction terminal and ground comprising the parallel combination of a third controlled resistance connected in series with a third impedance and a fourth controlled resistance connected in series with a fourth impedance; and means for controlling the resistances of said first and third resistances in the opposite direction to said second and fourth resistances.
Claim 3
Dependent Claim
26 words
A compensation network as set forth in claim 1 wherein: at least one of said first, second, third, and fourth impedances is a tuned LC circuit.
Claim 4
Dependent Claim
27 words
A compensation network as set forth in claim 2 wherein: at least one of said first, second, third, and fourth impedances is a series tuned LC circuit.
Claim 5
Dependent Claim
27 words
A compensation network as set forth in claim 2 wherein: at least one of said first, second, third, and fourth impedances is a parallel tuned LC circuit.
Claim 6
Dependent Claim
100 words
A compensation network having an input terminal and an output terminal, comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge impedance connected between the input terminal and the output terminal; a shunt impedance connected between the junction node and ground comprising the parallel combination of a first controlled resistance connected in series with a first impedance and a second controlled resistance connected in series with a second impedance; and means for controlling the resistance of said first and second controlled resistances in opposite directions.
Claim 7
Dependent Claim
100 words
A compensation network having an input terminal and an output terminal, comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge impedance connected between the input terminal and the output terminal; a shunt impedance connected between the junction node and ground comprising the parallel combination of a first controlled resistance connected in series with a first impedance and a second controlled resistance connected in series with a second impedance; and means for controlling the resistance of said first and second controlled resistances in opposite directions.
Claim 8
Dependent Claim
19 words
A compensation network as set forth in claim 5 wherein: said first and second impedances are tuned LC circuits.
Claim 9
Dependent Claim
20 words
A compensation network as set forth in claim 6 wherein: said first and second impedances are series tuned LC circuits.
Claim 10
Dependent Claim
20 words
A compensation network as set forth in claim 6 wherein: said first and second impedances are parallel tuned LC circuits.
Claim 11
Dependent Claim
100 words
A compensation network having an input terminal and an output terminal comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge impedance connected between the input terminal and the output terminal comprising the series combination of a first controlled resistance connected in parallel with a first impedance and a second controlled resistance connected in parallel with a second impedance; a shunt impedance connected between said junction node and ground; and means for controlling the resistance of said first and second controlled resistances in opposite directions.
Claim 12
Dependent Claim
100 words
A compensation network having an input terminal and an output terminal comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge impedance connected between the input terminal and the output terminal comprising the series combination of a first controlled resistance connected in parallel with a first impedance and a second controlled resistance connected in parallel with a second impedance; a shunt impedance connected between said junction node and ground; and means for controlling the resistance of said first and second controlled resistances in opposite directions.
Claim 13
Dependent Claim
19 words
A compensation network as set forth in claim 9 wherein; said first and second impedances are tuned LC circuits.
Claim 14
Dependent Claim
20 words
A compensation network as set forth in claim 10 wherein: said first and second impedances are series tuned LC circuits.
Claim 15
Dependent Claim
20 words
A compensation network as set forth in claim 10 wherein: said first and second impedances are parallel tuned LC circuits.
Claim 16
Dependent Claim
147 words
A slope compensation network for an off-premises CATV system which transmits a broadband television signal to a plurality of subscribers, said network having a control terminal, an input terminal, and an output terminal, comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge resistance connected between the input terminal and the output terminal; a shunt impedance connected between the junction node and ground comprising the parallel combination of a first controlled resistance connected in series with a first impedance and a second controlled resistance connected in series with a second impedance; and wherein said control terminal is connected to said first and second controlled resistances to control their resistances in opposite directions in response to a control voltage indicative of the amount and direction of the slope in the broadband television signal.
Claim 17
Dependent Claim
147 words
A slope compensation network for an off-premises CATV system which transmits a broadband television signal to a plurality of subscribers, said network having a control terminal, an input terminal, and an output terminal, comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge resistance connected between the input terminal and the output terminal; a shunt impedance connected between the junction node and ground comprising the parallel combination of a first controlled resistance connected in series with a first impedance and a second controlled resistance connected in series with a second impedance; and wherein said control terminal is connected to said first and second controlled resistances to control their resistances in opposite directions in response to a control voltage indicative of the amount and direction of the slope in the broadband television signal.
Claim 18
Dependent Claim
17 words
A slope compensation network as set forth in claim 13 wherein: said impedance approximately matches 75 ohms.
Claim 19
Dependent Claim
20 words
A slope compensation network as set forth in claim 13 wherein: said first impedance is a parallel tuned LC circuit.
Claim 20
Dependent Claim
20 words
A slope compensation network as set forth in claim 15 wherein: said second impedance is a series tuned LC circuit.
Claim 21
Dependent Claim
167 words
A slope compensation network for an off-premises CATV system which transmits a broadband television signal to a plurality of subscribers, said network having a control terminal, an input terminal, and an output terminal, comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge resistance connected between the input terminal and the output terminal; a shunt impedance connected between the junction node and ground comprising the parallel combination of a first controlled resistance having a first diode connected in series with a first impedance including a parallel tuned LC circuit and a second controlled resistance having a second diode connected in series with a second impedance including a series tuned LC circuit; and wherein said control terminal is connected to said first and second controlled resistances to control their resistances in opposite directions in response to a control voltage indicative of the amount and direction of the slope in the broadband television signal.
Claim 22
Dependent Claim
167 words
A slope compensation network for an off-premises CATV system which transmits a broadband television signal to a plurality of subscribers, said network having a control terminal, an input terminal, and an output terminal, comprising: an impedance connected between the input terminal and a junction node; an impedance connected between said junction node and the output terminal; a bridge resistance connected between the input terminal and the output terminal; a shunt impedance connected between the junction node and ground comprising the parallel combination of a first controlled resistance having a first diode connected in series with a first impedance including a parallel tuned LC circuit and a second controlled resistance having a second diode connected in series with a second impedance including a series tuned LC circuit; and wherein said control terminal is connected to said first and second controlled resistances to control their resistances in opposite directions in response to a control voltage indicative of the amount and direction of the slope in the broadband television signal.
Claim 23
Dependent Claim
33 words
A slope compensation network as set forth in claim 17 which further includes: a DC bias network connected to said junction node for providing a biasing voltage to said first and second diodes.
Claim 24
Dependent Claim
39 words
A slope compensation network a set forth in claim 18 wherein: said first diode is connected between said parallel tuned circuit and said junction node and is poled to conduct for control voltages in excess of said bias voltage.
Claim 25
Dependent Claim
38 words
A slope compensation network as set forth in claim 18 wherein: said second diode is connected between said series tuned circuit and said junction node and is poled to conduct for control voltages less than said bias voltage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |