Patent US3818130A successfully refreshed from Google Patents.
US3818130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reading pacer for educational television
Assignee: Westinghouse Electric Corp
•
Filing: 1973-01-09
•
Granted: 1974-06-18
•
Expires: 1993-01-09
Abstract
Abstract A reading pacer for educational television systems wherein blanking pulses of increasingly greater widths are employed to blank out successive lines of printed material appearing on a television screen starting from the top of the screen and progressing to the bottom. A ramp generator under the control of the viewer of the screen is used to control the generation of blanking pulses of successively greater widths and, hence, the rate at which successive lines of printed material on the screen are blanked out.
Inventors
- 👤 M Uhler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:23
CPC Classifications
G; G09; G09B; G09B17/00; G09B17/04; H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/265
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
In a system for blanking out successive lines of printed material appearing on a television picture tube screen sTarting from the top of the screen and progressing toward the bottom, the combination of: means in a television receiver for deriving a video signal representing successive lines of printed material to be displayed on the picture tube screen as a single scene; blanking circuit means in said receiver for applying said video signal to the picture tube; means for applying blanking pulses of successively wider widths to said blanking circuit means to blank out a portion of the video signal at the receiver, each blanking pulse having a leading edge coinciding substantially with a vertical sync pulse applied to said receiving tube; and means under the control of the viewer of said screen for controlling the width of successive blanking pulses.
Claim 2
Dependent Claim
140 words
In a system for blanking out successive lines of printed material appearing on a television picture tube screen sTarting from the top of the screen and progressing toward the bottom, the combination of: means in a television receiver for deriving a video signal representing successive lines of printed material to be displayed on the picture tube screen as a single scene; blanking circuit means in said receiver for applying said video signal to the picture tube; means for applying blanking pulses of successively wider widths to said blanking circuit means to blank out a portion of the video signal at the receiver, each blanking pulse having a leading edge coinciding substantially with a vertical sync pulse applied to said receiving tube; and means under the control of the viewer of said screen for controlling the width of successive blanking pulses.
Claim 3
Dependent Claim
40 words
The system of claim 1 wherein said means for applying blanking pulses to said blanking circuit comprises a monostable multivibrator which is triggered to change stable states by pulses coinciding substantially with vertical sync pulses applied to said picture tube.
Claim 4
Dependent Claim
69 words
The system of claim 2 wherein the means under the control of the viewer for controlling the width of successive blanking pulses comprises a ramp generator connected to said monostable multivibrator to progressively increase the widths of the pulses produced by the monostable multivibrator, and means under the control of the viewer of said screen for varying the slope of the ramp at the output of said ramp generator.
Claim 5
Dependent Claim
61 words
The system of claim 3 including switch means for applying said pulses coinciding substantially with said vertical sync pulses to said monostable multivibrator, means for detecting a signal transmitted from a transmitter and for producing a pulse to close said switch means, and means for detecting a signal sent from said transmitter to produce a pulse for opening said switch means.
Claim 6
Dependent Claim
26 words
The system of claim 4 wherein said pulses are utilized, respectively, to initiate a ramp output from said ramp generator and to reset the ramp generator.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |