Patent US3820156A successfully refreshed from Google Patents.
US3820156A
Expired / Lapsed
US
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Method and arrangement for automatic phase and amplitude control in a vectorscope
Assignee: Robert Bosch Fernsehanlagen GmbH
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Filing: 1973-03-28
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Granted: 1974-06-25
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Expires: 1993-03-28
Abstract
Abstract A switch automatically connects a circular test signal to the input of the bandpass amplifier in the vectorscope during the horizontal flyback time of the composite television signal whose color signals are to be displayed on the vectorscope. The combined signal is fed through the standard vectorscope stages to the demodulator output at which are furnished the B-Y and R-Y signals. Also connected to each of the demodulator outputs is a switch operated in synchronism with the switch inserting the circular test signal into the composite television signal. The output of the switch connected to the R-Y demodulator is fed through a 90* phase shift stage and then serves to synchronize a first oscillator. The output of the second switch synchronizes a second oscillator and the two oscillator outputs are fed into a phase comparator stage whose output in turn controls the phase shift in the demodulator. Amplitude comparison of the phase shifted signal and the signal at the output of the second switch connected to the B-Y output of the demodulator results in a first control signal which varies the gain of the amplifier amplifying the chrominance signal from which the B-Y signal will be derived.
Inventors
- 👤 A Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:07
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
In a vectorscope having an input, X and Y deflection plates, X and Y amplifier means, demodulator means and switch means for alternately connecting a composite television signal having blanked flyback intervals and a circular test signal to said input, a method for automatically controlling the phase of said demodulator means and the amplification of said amplifier means, comprising, in combination, the steps of applying said circular test signal to said input through said switch means during said blanked flyback intervals; deriving a first and second test signal from the output of said demodulator means; comparing the amplitude and phase of said second test signal to the amplitude and phase of said first test signal and furnishing a first and second control signal corresponding, respectively, to the differences in amplitude and in phase of said first and second test signal; and controlling said amplification and said phase in dependence, respectively, upon said first and second control signal.
Claim 2
Dependent Claim
157 words
In a vectorscope having an input, X and Y deflection plates, X and Y amplifier means, demodulator means and switch means for alternately connecting a composite television signal having blanked flyback intervals and a circular test signal to said input, a method for automatically controlling the phase of said demodulator means and the amplification of said amplifier means, comprising, in combination, the steps of applying said circular test signal to said input through said switch means during said blanked flyback intervals; deriving a first and second test signal from the output of said demodulator means; comparing the amplitude and phase of said second test signal to the amplitude and phase of said first test signal and furnishing a first and second control signal corresponding, respectively, to the differences in amplitude and in phase of said first and second test signal; and controlling said amplification and said phase in dependence, respectively, upon said first and second control signal.
Claim 3
Dependent Claim
23 words
A method as set forth in claim 1, wherein said blanked flyback intervals are the horizontal flyback intervals of said composite television signal.
Claim 4
Dependent Claim
207 words
In a vectorscope having an input, X and Y defleCtion plates, X and Y amplifier means, demodulator means and switch means for alternately connecting a composite television signal having blanked flyback intervals and a circular test signal to said input, a system for automatically controlling the phase of said demodulator means and the gain of said amplifier means, comprising, in combination, means operating said switch means in such a manner that said circular test signal is applied to said input during said blanked flyback intervals of said composite television signal; means for deriving a first and second test signal from the output of said demodulator means; first comparing means for comparing the amplitude of said first test signal to the amplitude of said second test signal and furnishing a first control signal corresponding to the difference therebetween; second comparing means for comparing the phase of said second test signal to the phase of said first test signal and furnishing a second control signal as a function of the difference therebetween; and means applying said first and second control signals to said amplifier and demodulator means respectively, in such a manner that the phase of said demodulator means and the gain of said amplifier means are controlled thereby.
Claim 5
Dependent Claim
207 words
In a vectorscope having an input, X and Y defleCtion plates, X and Y amplifier means, demodulator means and switch means for alternately connecting a composite television signal having blanked flyback intervals and a circular test signal to said input, a system for automatically controlling the phase of said demodulator means and the gain of said amplifier means, comprising, in combination, means operating said switch means in such a manner that said circular test signal is applied to said input during said blanked flyback intervals of said composite television signal; means for deriving a first and second test signal from the output of said demodulator means; first comparing means for comparing the amplitude of said first test signal to the amplitude of said second test signal and furnishing a first control signal corresponding to the difference therebetween; second comparing means for comparing the phase of said second test signal to the phase of said first test signal and furnishing a second control signal as a function of the difference therebetween; and means applying said first and second control signals to said amplifier and demodulator means respectively, in such a manner that the phase of said demodulator means and the gain of said amplifier means are controlled thereby.
Claim 6
Dependent Claim
50 words
An arrangement as set forth in claim 3, wherein said means for operating said switch means comprise means for operating said switch means in such a manner that said circular test signal is applied to said input of said vectorscope during the horizontal flyback intervals of said composite television signal.
Claim 7
Dependent Claim
79 words
An arrangement as set forth in claim 4, wherein said demodulator means comprise first and second demodulator means for furnishing, respectively, the R-Y and the B-Y signals to said X and Y deflection plates of said vectorscope; and wherein said means for deriving said first and second test signals comprise first and second additional switch means connected, respectively, to the output of said first and second demodulator means and operated in synchronism with said switch means of said vectorscope.
Claim 8
Dependent Claim
116 words
An arrangement as set forth in claim 5, wherein said second comparator means comprise 90*phase shift means connected to said first switch means, for furnishing a phase shifted first test signal; first oscillator means connected to the output of said 90* phase shift means for furnishing a first oscillator signal synchronized to said phase-shifted first test signal; second oscillator means connected to said second switch means for furnishing a second oscillator signal synchronized with said second test signal, and phase comparator means having a first input connected to the output of said first oscillator means, a second input connected to the output of said second oscillator means and an output for furnishing said second control signal.
Claim 9
Dependent Claim
45 words
An arrangement as set forth in claim 6, further comprising means for connecting said output of said phase comparator means to said demodulator means in such a manner that the phase shift in said demodulator means varies as a function of said second control signal.
Claim 10
Dependent Claim
138 words
An arrangement as set forth in claim 5, further comprising phase shift means connected to said first additional switch means for phase shifting said first test signal an angle of 90*, thereby creating a phase shifted first test signal; and wherein said first comparator means comprise adder means having a first and second input for, respectively, receiving said phase shifted first test signal and said second test signal, and an adder output, rectifier means for rectifier said phase shifted first test signal, thereby furnishing a rectified signal; integrator circuit means having an integrator input and an integrator output for furnishing said first control signal as a function of the integral of a signal applied at said integrator input, and comparator switch means operative under control of said rectified signal, for connecting said adder output to said integrator input.
Claim 11
Dependent Claim
68 words
An arrangemEnt as set forth in claim 8, further comprising first and second amplifier means having, respectively, a first and second output connected to the input of said first and second demodulator means; and means interconnecting the output of said integrator means to said second amplifier means in such a manner that the amplification of said second amplifier means varies as a function of said first control signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |