Patent US3590149A successfully refreshed from Google Patents.
US3590149A
Expired / Lapsed
US
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Television test instrument
Assignee: MTL Systems Inc
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Filing: 1969-11-10
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Granted: 1971-06-29
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Expires: 1989-11-10
Abstract
Abstract Television test instrument for developing test patterns by modulating the lines of a television raster, particularly for creating dot and bar patterns in which multivibrators are provided for creating the signals for the patterns which include components for permitting shifting of the developed pattern substantial distances and for synchronizing the developed pattern with the horizontal rate pulses and vertical blanking pulses.
Inventors
- 👤 John H Harshbarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:56
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/04; H04N17/045
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
326 words
A television test instrument for developing test patterns on a television raster under the control of horizontal and vertical blanking pulses, said instrument comprising; signal-developing means operable when actuated to supply a modulating signal for modulating the scanning lines of a television raster, a first multivibrator connected to said signal developing means in controlling relation thereto, a second multivibrator connected in controlling relation to said first multivibrator, said second multivibrator having a period a fraction of the duration of a scanning line whereby to be operable to control said first multivibrator to actuate said signal developing means to develop a plurality of said modulating signals during a scanning line, said second multivibrator comprising an astable multivibrator having first and second components each with an output terminal and a control terminal, a capacitor connecting the control terminal of each component with the output terminal of the other component, a charging circuit for each capacitor and at least the charging circuit for the capacitor connected to the control terminal of said first component being adjustable for controlling the period of said second multivibrator and thereby controlling the operation of said first multivibrator and the horizontal spacing between successive modulating signals from said signaldeveloping means, a clamp circuit having an input terminal and connected to the control terminal of said first component and operable upon the supply of a pulse of one polarity to said input terminal to supply a voltage to said second multivibrator of a polarity to clamp it in off condition, a supply of voltage connected to said components, said supply of voltage being connected to said clamp circuit to supply bias voltage thereto opposite in polarity to said pulses and means for adjusting said bias voltage, and voltage dropping means in series with said second component for reducing the voltage at the said output terminal thereof thereby to increase the range of control afforded by adjustment of the said bias voltage of said clamp circuit.
Claim 2
Dependent Claim
326 words
A television test instrument for developing test patterns on a television raster under the control of horizontal and vertical blanking pulses, said instrument comprising; signal-developing means operable when actuated to supply a modulating signal for modulating the scanning lines of a television raster, a first multivibrator connected to said signal developing means in controlling relation thereto, a second multivibrator connected in controlling relation to said first multivibrator, said second multivibrator having a period a fraction of the duration of a scanning line whereby to be operable to control said first multivibrator to actuate said signal developing means to develop a plurality of said modulating signals during a scanning line, said second multivibrator comprising an astable multivibrator having first and second components each with an output terminal and a control terminal, a capacitor connecting the control terminal of each component with the output terminal of the other component, a charging circuit for each capacitor and at least the charging circuit for the capacitor connected to the control terminal of said first component being adjustable for controlling the period of said second multivibrator and thereby controlling the operation of said first multivibrator and the horizontal spacing between successive modulating signals from said signaldeveloping means, a clamp circuit having an input terminal and connected to the control terminal of said first component and operable upon the supply of a pulse of one polarity to said input terminal to supply a voltage to said second multivibrator of a polarity to clamp it in off condition, a supply of voltage connected to said components, said supply of voltage being connected to said clamp circuit to supply bias voltage thereto opposite in polarity to said pulses and means for adjusting said bias voltage, and voltage dropping means in series with said second component for reducing the voltage at the said output terminal thereof thereby to increase the range of control afforded by adjustment of the said bias voltage of said clamp circuit.
Claim 3
Dependent Claim
47 words
A television test instrument according to claim 1 in which the said pulses supplied to said input terminal of said clamp circuit are blanking pulses whereby the said modulating signals are initiated in the same lateral position along each scanning line to which modulating signals are supplied.
Claim 4
Dependent Claim
51 words
A television test instrument according to claim 2 which includes a diode connecting said clamp circuit to said control terminal of said first component of said secOnd multivibrator whereby said clamp circuit influences said second multivibrator only when a said pulse is supplied to the input terminal of said clamp circuit.
Claim 5
Dependent Claim
77 words
A television test instrument according to claim 3 in which said first multivibrator is a monostable multivibrator and causes said signal developing means to develop a signal only when said first multivibrator is in its instable state, and first and second control elements connected to said first multivibrator and each operable when actuated to clamp said first multivibrator in a respective state thereof thereby to clamp said signal developing means in actuated and nonactuated position thereof respectively.
Claim 6
Dependent Claim
119 words
A television test instrument according to claim 4 in which said first control element is operable to clamp said first multivibrator in its stable state and said second control element is operable to clamp said first multivibrator in its instable state, and control means selectively operable for supply a first actuating signal to said first control element during the interval of a predetermined number of scanning lines and for interrupting said first actuating signal for the duration of a single scanning line only at the end of each said interval to cause modulating signals to be developed only on said single lines of the raster thereby to develop a pattern of horizontally and vertically opposed dots on said raster.
Claim 7
Dependent Claim
45 words
A television test instrument according to claim 5 in which said control means is selectively operable for supplying a second actuating signal to said second control means for the duration of said single lines only thereby to develop vertically opposed horizontal lines on said raster.
Claim 8
Dependent Claim
85 words
A television test instrument according to claim 6 in which said control means comprises a monostable third multivibrator a bistable fourth multivibrator so interconnected that in one state thereof said third multivibrator triggers said fourth multivibrator into the instable state thereof and said fourth multivibrator while in the instable state thereof clamps said third multivibrator in its said one state, said third multivibrator having first and second terminals at which said first and second control signals are developed in respective states of said third multivibrator.
Claim 9
Dependent Claim
88 words
A television test instrument according to claim 7 in which said third multivibrator has a trigger terminal to which horizontal blanking pulses are supplied and the opposite edges of which trigger said third multivibrator into opposite states thereof, the leading edge of a said horizontal blanking pulse triggering said third multivibrator into the said one state thereof and thereby causing triggering of said fourth multivibrator into the instable state thereof, the period of said fourth multivibrator being equal to the interval between said single lines of the raster.
Claim 10
Dependent Claim
222 words
A television test instrument according to claim 8 in which said fourth multivibrator has third and fourth components each with an output terminal and a control terminal, a capacitor connecting the output terminal of said third component to the control terminal of said fourth component, a charging circuit connected to said capacitor and adjustable to adjust the period of said fourth multivibrator thereby to adjust the period of time said third multivibrator remains in its said one state, said third multivibrator supplying first control signals to said first terminal when in said one state and second control signals to said second terminal when in the other state, a further capacitor connecting the control terminal of said third component to said third multivibrator to receive trigger pulses therefrom, said source of voltage being connected to said components, voltage-dropping means serially connected with said third component for reducing the voltage at the output terminal thereof, a second clamp circuit connected to the control terminal of said fourth component and having an input terminal and operable upon the supply of a pulse thereto to clamp said fourtH multivibrator in the instable state thereof, said source of voltage being connected to said second clamp circuit to supply bias voltage thereto of a polarity opposite to that of said pulse and means for adjusting said bias voltage.
Claim 11
Dependent Claim
27 words
A television test instrument according to claim 9 in which the pulse supplied to the input terminal of said second clamp circuit is the vertical blanking pulse.
Claim 12
Dependent Claim
41 words
A television test instrument according to claim 12 which includes a diode connecting said input terminal of said second clamp circuit to said third multivibrator and operable to said third multivibrator from going to its said one state during vertical blanking.
Claim 13
Dependent Claim
70 words
A television test instrument according to claim 11 which includes gates connecting said first and second terminals of said fourth multivibrator to said first and second control elements of said first multivibrator, said gates having control terminals and being enabled to pass signals only upon the supply of voltage to the said control terminals thereof, and means for selectively supplying enabling voltage to the said control terminals of said gates.
Claim 14
Dependent Claim
22 words
A television test instrument according to claim 1 in which said voltage-dropping means, in series with said second component, is a resistor.
Claim 15
Dependent Claim
22 words
A television test instrument according to claim 9 in which said voltage-dropping means, in series with said third component, is a resistor.
References Cited (Backward Citations)
US3483479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |