US5410364A
Expired / Lapsed
US
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Method and apparatus for removing AGC pulses and other undesirable signals from a video signal
Assignee: Individual
•
Filing: 1992-01-15
•
Granted: 1995-04-25
•
Expires: 2012-01-15
Abstract
Abstract AGC pulses and other undesirable signals are removed from a video signal by generating a replica of the AGC pulses or other signals and then mixing the replica with the original video to effect their removal.
Inventors
- 👤 James A. Karlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:11
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/52; H04N5/14; H04N5/21
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
59 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and linearly mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal.
Claim 2
Independent Claim
59 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and linearly mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal.
Claim 3
Dependent Claim
20 words
A method as in claim 1, wherein said replicating step comprises processing said input video signal through a gate circuit.
Claim 4
Dependent Claim
15 words
A method as in claim 1, wherein said mixing is done by the resistive method.
Claim 5
Dependent Claim
31 words
A method as in claim 2, wherein said replicating step includes the step of establishing a reference level for the replica pulse during those times that the gate circuit is open.
Claim 6
Independent Claim
93 words
An apparatus for removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising: a sync separator for outputting sync; a replica generator responsive to said sync and said video signal for generating a replica of said AGC pulses; and a linear mixer for summing the output replicated AGC pulses of said replica generator and said video signal in plus/minus relative relationship, so as to cancel said AGC pulses by destructive summation and provide an output video signal substantially free of AGC pulses.
Claim 7
Independent Claim
93 words
An apparatus for removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising: a sync separator for outputting sync; a replica generator responsive to said sync and said video signal for generating a replica of said AGC pulses; and a linear mixer for summing the output replicated AGC pulses of said replica generator and said video signal in plus/minus relative relationship, so as to cancel said AGC pulses by destructive summation and provide an output video signal substantially free of AGC pulses.
Claim 8
Dependent Claim
21 words
An apparatus as in claim 5, wherein said sync separator is connected to receive video at a node before said mixer.
Claim 9
Dependent Claim
13 words
An apparatus as in claim 5, wherein said replica generator includes a gate.
Claim 10
Dependent Claim
15 words
An apparatus as in claim 5, wherein said replica generator includes a blanking reference generator.
Claim 11
Independent Claim
78 words
A method of removing AGC pulses, following sync pulses from a video signal comprising the steps of: separating sync, using sync to generate a gating pulse; using said gating pulse to establish a conduction path from the output of a mixer to the input of a unilaterally conducting current source; and applying the output of said unilaterally conducting current source to an input of said mixer, so as to provide a video signal output free of AGC pulses.
Claim 12
Independent Claim
78 words
A method of removing AGC pulses, following sync pulses from a video signal comprising the steps of: separating sync, using sync to generate a gating pulse; using said gating pulse to establish a conduction path from the output of a mixer to the input of a unilaterally conducting current source; and applying the output of said unilaterally conducting current source to an input of said mixer, so as to provide a video signal output free of AGC pulses.
Claim 13
Dependent Claim
20 words
A method as in claim 9, further comprising the step of delaying the video signal before application to said mixer.
Claim 14
Dependent Claim
18 words
A method as in claim 9, further comprising the step of delaying the video signal within the mixer.
Claim 15
Dependent Claim
34 words
A method as in claim 9, further comprising the step of amplifying the output current of said unilaterally conducting current source by a amplifying device receiving its input from said unilaterally conducting current source.
Claim 16
Dependent Claim
32 words
A method as in claim 9, further comprising the step of providing a second unilaterally conducting current source which conducts at times when the first unilaterally conducting current source is not conducting.
Claim 17
Independent Claim
67 words
An apparatus for modifying a video signal which contains AGC pulses, after sync pulses, comprising: a sync separator for separating sync from a video signal; a replica generator connected to said video signal and said sync separator so as to provide a replica signal; and a mixing resistor to receive said video signal and said replica signal; whereby AGC pulses are effectively removed from said video signal.
Claim 18
Independent Claim
67 words
An apparatus for modifying a video signal which contains AGC pulses, after sync pulses, comprising: a sync separator for separating sync from a video signal; a replica generator connected to said video signal and said sync separator so as to provide a replica signal; and a mixing resistor to receive said video signal and said replica signal; whereby AGC pulses are effectively removed from said video signal.
Claim 19
Independent Claim
67 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal; wherein said mixing is by the current summing method.
Claim 20
Independent Claim
67 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal; wherein said mixing is by the current summing method.
Claim 21
Independent Claim
66 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal; wherein said video signal is delayed before mixing.
Claim 22
Independent Claim
66 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal; wherein said video signal is delayed before mixing.
Claim 23
Independent Claim
72 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal; wherein said separating sync pulses step acts upon video outputted by said mixing step.
Claim 24
Independent Claim
72 words
A method of removing AGC pulses added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising the steps of: separating sync pulses; replicating said AGC pulses using sync and video; and mixing said replica pulses with said video signal, so as to remove said AGC pulses from said video signal; wherein said separating sync pulses step acts upon video outputted by said mixing step.
Claim 25
Independent Claim
97 words
An apparatus for removing AGC pulses, or other signals, added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising: a sync separator for outputting sync; a replica generator responsive to said sync and said video signal for generating a replica of said AGC pulses or other signals; and a mixer for mixing the output of said replica generator and said video signal, so as to provide an output video signal free of AGC pulses; wherein said sync separator is connected to receive video from a node after said mixer.
Claim 26
Independent Claim
97 words
An apparatus for removing AGC pulses, or other signals, added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising: a sync separator for outputting sync; a replica generator responsive to said sync and said video signal for generating a replica of said AGC pulses or other signals; and a mixer for mixing the output of said replica generator and said video signal, so as to provide an output video signal free of AGC pulses; wherein said sync separator is connected to receive video from a node after said mixer.
Claim 27
Independent Claim
104 words
An apparatus for removing AGC pulses, or other signals, added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising: a sync separator for outputting sync; a replica generator responsive to said sync and said video signal for generating a replica of said AGC pulses or other signals; and a mixer for mixing the output of said replica generator and said video signal, so as to provide an output video signal free of AGC pulses; said apparatus further comprising a video gate so as to provide the sync separator with a video signal free of unwanted signals.
Claim 28
Independent Claim
104 words
An apparatus for removing AGC pulses, or other signals, added after sync pulses to a video signal for the purpose of controlling an automatic gain control, comprising: a sync separator for outputting sync; a replica generator responsive to said sync and said video signal for generating a replica of said AGC pulses or other signals; and a mixer for mixing the output of said replica generator and said video signal, so as to provide an output video signal free of AGC pulses; said apparatus further comprising a video gate so as to provide the sync separator with a video signal free of unwanted signals.
Claim 29
Independent Claim
88 words
An apparatus for modifying a video signal which contains AGC pulses, after sync pulses, comprising: a sync separator for separating sync from a video signal; a replica generator connected to said video signal and said sync separator so as to provide a replica signal; and a mixing resistor to receive said video signal and said replica signal; whereby AGC pulses are effectively removed from said video; wherein said replica generator signal includes a unilaterally conducting device so as to provide a current mode replica of said AGC pulses.
Claim 30
Independent Claim
88 words
An apparatus for modifying a video signal which contains AGC pulses, after sync pulses, comprising: a sync separator for separating sync from a video signal; a replica generator connected to said video signal and said sync separator so as to provide a replica signal; and a mixing resistor to receive said video signal and said replica signal; whereby AGC pulses are effectively removed from said video; wherein said replica generator signal includes a unilaterally conducting device so as to provide a current mode replica of said AGC pulses.
Claim 31
Dependent Claim
22 words
An apparatus as in claim 20, wherein the output current of said unilaterally conducting device is further amplified by an amplifying device.
Claim 32
Dependent Claim
21 words
An apparatus as in claim 20, further comprising a delay line interposed between said mixing resistor and the replica generator output.
Claim 33
Dependent Claim
20 words
An apparatus as in claim 20, further comprising a second current mode replica generator for signals of the opposite polarity.
Claim 34
Independent Claim
86 words
An apparatus for modifying a video signal which contains AGC pulses, after sync pulses, comprising: a sync separator for separating sync from a video signal; a replica generator connected to said video signal and said sync separator so as to provide a replica signal; and a mixing resistor to receive said video signal and said replica signal; whereby AGC pulses are effectively removed from said video; said apparatus further comprising a means for reducing the sync separator current during times when no video signal is received.
Claim 35
Independent Claim
86 words
An apparatus for modifying a video signal which contains AGC pulses, after sync pulses, comprising: a sync separator for separating sync from a video signal; a replica generator connected to said video signal and said sync separator so as to provide a replica signal; and a mixing resistor to receive said video signal and said replica signal; whereby AGC pulses are effectively removed from said video; said apparatus further comprising a means for reducing the sync separator current during times when no video signal is received.
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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) | 1998-04-24 | 1998-10-24 | 1999-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-24 | 2002-10-24 | 2003-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-24 | 2006-10-24 | 2007-04-25 | $7700.00 | Window Closed / Lapsed |