Patent US3689691A successfully refreshed from Google Patents.
US3689691A
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US
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Channel equalization for differencing pre-recorded and live video signals
Assignee: Westinghouse Electric Corp
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Filing: 1970-11-17
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Granted: 1972-09-05
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Expires: 1990-11-17
Abstract
Abstract A system of channel equalization for differencing recorded and live signals, such as produced in response to input video signals, wherein the input video signals are processed commonly then applied to separate record and live channels having essentially identical characteristics. The difference between the recorded and live signals, having substantially identical processing, is then taken and displayed on a monitor.
Inventors
- 👤 Tamas I Pattantyus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:32
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/32; H04N5/3205
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
In a system for channel equalization of recorded and live output signals produced in response to live input signals the combination of: input modulator means for modulating said live input signals to provide processed input signals; recording means for recording a selected predetermined quantity of said processed input signals; first demodulator means for demodulating said processed input signals to provide said live output signals; and second demodulator means for demodulating said selected predetermined quantity of said processed input signals recorded in said recording means to provide said recorded output signals; said first and second demodulator means having substantially equivalent response characteristics to signals applied thereto; said first and second demodulator means producing said live and recorded output signals respectively
Claim 2
Dependent Claim
119 words
In a system for channel equalization of recorded and live output signals produced in response to live input signals the combination of: input modulator means for modulating said live input signals to provide processed input signals; recording means for recording a selected predetermined quantity of said processed input signals; first demodulator means for demodulating said processed input signals to provide said live output signals; and second demodulator means for demodulating said selected predetermined quantity of said processed input signals recorded in said recording means to provide said recorded output signals; said first and second demodulator means having substantially equivalent response characteristics to signals applied thereto; said first and second demodulator means producing said live and recorded output signals respectively
Claim 3
Dependent Claim
39 words
The combination of claim 1 includes: delay means for delaying said processed input signals by a predetermined time before application to said first demodulator means so that said live and recorded output signals have a substantially equivalent time relationship.
Claim 4
Dependent Claim
36 words
The combination of claim 1 wherein: said line input signals comprise video signals, said recorded output signals are indicative of a selected image from storage; said live output signals are indicative of a real time image,
Claim 5
Dependent Claim
37 words
The combination of claim 3 wherein: said recording means includes magnetic recording and playback means wherein said selected signals are recorded therein and may be played back as said recorded output signals indicative of said selected image.
Claim 6
Dependent Claim
31 words
The combination of claim 1 wherein: said recording means includes magnetic recording and playback means wherein said selected signals are recorded therein and may be played back as said recorded signals.
Claim 7
Dependent Claim
62 words
The combination of claim 5 wherein: said magnetic recording and playback means has a predetermined time delay required for the recording and playing back operation; said combination includes delay means for delaying said processed input signals by said predetermined time delay before application to said first demodulator means so that said live and recorded output signals have a substantially equivalent time relationship.
Claim 8
Dependent Claim
36 words
The combination of claim 1 includes: differencing means for providing the difference between said live and recorded output signals; and monitor meaNs for providing an indication of said difference between said live and recorded output signals.
Claim 9
Dependent Claim
15 words
The combination of claim 7 wherein; said difference image is displayed on said monitor means.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |