US3800077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sharpness-enhancing equipment for television picture signals
Assignee: CBS Broadcasting Inc
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Filing: 1971-10-15
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Granted: 1974-03-26
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Expires: 1991-10-15
Abstract
Abstract An apparatus for automatically generating normalized detail signals from a video signal. Detail signals representative of instantaneous variations in the luminance portion of the video signal are generated. A signal averaging means responsive to the magnitude of the detail signals is provided for generating a control level representative of the detail content of a relatively long duration of the video signal. A modulator responsive to the control level and to the detail signals produces the normalized detail signals.
Inventors
- 👤 C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:29
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
Apparatus for automatically generating normalized detail signals from a video signal comprising: means for generating detail signals representative of instantaneous variations in the luminance portion of said video signal; signal averaging means responsive to the magnitude of said detail signals for generating a control level representative of the amount of detail contained in a relatively long duration of said video signal; and modulating means responsive to said control level for applying gain to said detail signals to produce said normalized detail signals, the amount of gain applied decreasing as said control level increases.
Claim 2
Dependent Claim
93 words
Apparatus for automatically generating normalized detail signals from a video signal comprising: means for generating detail signals representative of instantaneous variations in the luminance portion of said video signal; signal averaging means responsive to the magnitude of said detail signals for generating a control level representative of the amount of detail contained in a relatively long duration of said video signal; and modulating means responsive to said control level for applying gain to said detail signals to produce said normalized detail signals, the amount of gain applied decreasing as said control level increases.
Claim 3
Dependent Claim
13 words
Apparatus as defined by claim 1 wherein said modulating means comprises a multiplier.
Claim 4
Dependent Claim
20 words
Apparatus as defined by claim 2 wherein said signal averaging means comprises a rectifier and an integrator in series arrangement.
Claim 5
Dependent Claim
25 words
Apparatus as defined by claim 3 wherein said integrator comprises a storage capacitor which stores a voltage indicative of a sum of rectified detail signals.
Claim 6
Dependent Claim
30 words
Apparatus as defined by claim 4 wherein the charge and discharge time constants associated with said capacitor are relatively long as compared with the line rate of said video signal.
Claim 7
Dependent Claim
19 words
Apparatus as defined by claim 5 wherein said charge time constant is substantially shorter than said discharge time constant.
Claim 8
Dependent Claim
123 words
Apparatus for receiving an input video signal and automatically generating an enhanced video signal comprising: means for generating detail signals representative of instantaneous variations in the luminance portion of said input video signal; signal averaging means responsive to the magnitude of said detail signals for generating a control level representative of the amount of detail contained in a relatively long duration of said input video signal; modulating means responsive to said control level for applying gain to said detail signals to produce said normalized detail signals, the amount of gain applied decreasing as said control level increases; means for delaying said input video signal; and means for adding said normalized detail signals to the delayed input signals to produce said enhanced video signal.
Claim 9
Dependent Claim
123 words
Apparatus for receiving an input video signal and automatically generating an enhanced video signal comprising: means for generating detail signals representative of instantaneous variations in the luminance portion of said input video signal; signal averaging means responsive to the magnitude of said detail signals for generating a control level representative of the amount of detail contained in a relatively long duration of said input video signal; modulating means responsive to said control level for applying gain to said detail signals to produce said normalized detail signals, the amount of gain applied decreasing as said control level increases; means for delaying said input video signal; and means for adding said normalized detail signals to the delayed input signals to produce said enhanced video signal.
Claim 10
Dependent Claim
13 words
Apparatus as defined by claim 7 wherein said modulating means comprises a multiplier.
Claim 11
Dependent Claim
20 words
Apparatus as defined by claim 8 wherein said signal averaging means comprises a rectifier and an integrator in series arrangement.
Claim 12
Dependent Claim
25 words
Apparatus as defined by claim 9 wherein said integrator comprises a storage capacitor which stores a voltage indicative of a sum of rectified detail signals.
Claim 13
Dependent Claim
30 words
Apparatus as defined by claim 10 wherein the charge and discharge time constants associated with said capacitor are relatively long compared with the line rate of said input video signal.
Claim 14
Dependent Claim
19 words
Apparatus as defined by claim 11 wherein said charge time constant is substantially shorter than said discharge time constant.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |