US3715462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and circuit arrangement for regulating the amplitude of the color synchronizing signal
Assignee: Robert Bosch Fernsehanlagen GmbH
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Filing: 1970-08-31
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Granted: 1973-02-06
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Expires: 1990-08-31
Abstract
Abstract A method for controlling the amplitude of the color synchronizing signal in color television signals taken from a record carrier, wherein amplitude deviations from the nominal value occur which exhibit a periodically recurring component, wherein there is derived from the color synchronizing signal a control voltage corresponding to the deviation of the amplitude of the color synchronizing signal from the nominal value, such control voltage being delivered through a low pass filter, and at the same time, in respect of each of those lines for which the periodically recurring component of the deviations is substantially equal, the control voltage is averaged over a plurality of periods of the periodically recurring component, and the mean values thus obtained, and the control voltage delivered through the low pass filter is used to influence the frequency response of the taken off color television signals in the sense of reducing the deviations in the amplitude of the color synchronizing signal from the nominal value.
Inventors
- 👤 G Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:38
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/793; H04N9/7933; H04N9/44; H04N9/455
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
A method for controlling the amplitude of the color synchronizing signal in color television signals taken from a record carrier wherein amplitude deviations from the nominal value occur which exhibit a periodically recurring component, comprising the steps of deriving from the color synchronizing signal a control voltage corresponding to the deviation of the amplitude of the color synchronizing signal from the nominal value, applying said control voltage to the taken off color television signals through a low pass filter means to a first set of frequency distortion corrector means for a period exceeding one line, for correcting them, and at the same time averaging, in respect of each of those lines for which the periodically recurring component of the deviations is substantially equal, said control voltage in a storage device over a plurality of periods of the periodically recurring component, and selectively applying the averaged control signal from the storage device through a second frequency distortion correction means to the previously corrected signals for a period of one line to influence thereby the frequency response to the taken off color television signals in the sense of reducing the deviations in the amplitude for the color synchronizing signal from the nominal value.
Claim 2
Independent Claim
201 words
A method for controlling the amplitude of the color synchronizing signal in color television signals taken from a record carrier wherein amplitude deviations from the nominal value occur which exhibit a periodically recurring component, comprising the steps of deriving from the color synchronizing signal a control voltage corresponding to the deviation of the amplitude of the color synchronizing signal from the nominal value, applying said control voltage to the taken off color television signals through a low pass filter means to a first set of frequency distortion corrector means for a period exceeding one line, for correcting them, and at the same time averaging, in respect of each of those lines for which the periodically recurring component of the deviations is substantially equal, said control voltage in a storage device over a plurality of periods of the periodically recurring component, and selectively applying the averaged control signal from the storage device through a second frequency distortion correction means to the previously corrected signals for a period of one line to influence thereby the frequency response to the taken off color television signals in the sense of reducing the deviations in the amplitude for the color synchronizing signal from the nominal value.
Claim 3
Independent Claim
201 words
A method for controlling the amplitude of the color synchronizing signal in color television signals taken from a record carrier wherein amplitude deviations from the nominal value occur which exhibit a periodically recurring component, comprising the steps of deriving from the color synchronizing signal a control voltage corresponding to the deviation of the amplitude of the color synchronizing signal from the nominal value, applying said control voltage to the taken off color television signals through a low pass filter means to a first set of frequency distortion corrector means for a period exceeding one line, for correcting them, and at the same time averaging, in respect of each of those lines for which the periodically recurring component of the deviations is substantially equal, said control voltage in a storage device over a plurality of periods of the periodically recurring component, and selectively applying the averaged control signal from the storage device through a second frequency distortion correction means to the previously corrected signals for a period of one line to influence thereby the frequency response to the taken off color television signals in the sense of reducing the deviations in the amplitude for the color synchronizing signal from the nominal value.
Claim 4
Independent Claim
201 words
A method for controlling the amplitude of the color synchronizing signal in color television signals taken from a record carrier wherein amplitude deviations from the nominal value occur which exhibit a periodically recurring component, comprising the steps of deriving from the color synchronizing signal a control voltage corresponding to the deviation of the amplitude of the color synchronizing signal from the nominal value, applying said control voltage to the taken off color television signals through a low pass filter means to a first set of frequency distortion corrector means for a period exceeding one line, for correcting them, and at the same time averaging, in respect of each of those lines for which the periodically recurring component of the deviations is substantially equal, said control voltage in a storage device over a plurality of periods of the periodically recurring component, and selectively applying the averaged control signal from the storage device through a second frequency distortion correction means to the previously corrected signals for a period of one line to influence thereby the frequency response to the taken off color television signals in the sense of reducing the deviations in the amplitude for the color synchronizing signal from the nominal value.
Claim 5
Dependent Claim
305 words
A circuit arrangement for controlling the amplitude of the color synchronizing signal in color television signals taken from a record carrier by a plurality of periodically circulating reproduction heads, comprising a plurality of electronically controllable first frequency response distortion correctors for receiving the television signals from an assigned one of said reproduction heads therein, a second frequency response distortion corrector, first switching means connecting said second frequency response distortion corrector in synchronism with the operation of respective reproduction heads, a demodulator connected to the output of said second distortion corrector, a rectifier arrangement, a gate circuit connecting said rectifier arrangement to the output of said demodulator, said gate circuit being conductive only for the duration of the color synchronizing signal, a pair of subtraction circuits each connected with one of their inputs to the output of the rectifier arrangement, the other respective inputs of said subtraction circuits being supplied with a direct voltage representing the nominal value of the amplitude of the color synchronizing signal, a plurality of low pass filter means, second switching means synchronized with said first switching means and connecting through said low pass filter means the output of one of said subtraction circuits to respective control inputs of said first frequency response distortion correctors, a plurality of storage devices, the quantity of which being selected according to the number of the regularly recurring lines during the scanning period of one reproduction head, a resistance and an electronic changeover switch connecting the output of said second subtraction circuit to said storage devices, a further electronic changeover switch connecting said storage devices to the control input of said second frequency response distortion correction, each of said electronic changeover switches operating substantially in synchronism with the occurrence of respective lines, thereby applying additional control signal for compensating periodically occurring amplitude distortions in said lines.
Claim 6
Dependent Claim
305 words
A circuit arrangement for controlling the amplitude of the color synchronizing signal in color television signals taken from a record carrier by a plurality of periodically circulating reproduction heads, comprising a plurality of electronically controllable first frequency response distortion correctors for receiving the television signals from an assigned one of said reproduction heads therein, a second frequency response distortion corrector, first switching means connecting said second frequency response distortion corrector in synchronism with the operation of respective reproduction heads, a demodulator connected to the output of said second distortion corrector, a rectifier arrangement, a gate circuit connecting said rectifier arrangement to the output of said demodulator, said gate circuit being conductive only for the duration of the color synchronizing signal, a pair of subtraction circuits each connected with one of their inputs to the output of the rectifier arrangement, the other respective inputs of said subtraction circuits being supplied with a direct voltage representing the nominal value of the amplitude of the color synchronizing signal, a plurality of low pass filter means, second switching means synchronized with said first switching means and connecting through said low pass filter means the output of one of said subtraction circuits to respective control inputs of said first frequency response distortion correctors, a plurality of storage devices, the quantity of which being selected according to the number of the regularly recurring lines during the scanning period of one reproduction head, a resistance and an electronic changeover switch connecting the output of said second subtraction circuit to said storage devices, a further electronic changeover switch connecting said storage devices to the control input of said second frequency response distortion correction, each of said electronic changeover switches operating substantially in synchronism with the occurrence of respective lines, thereby applying additional control signal for compensating periodically occurring amplitude distortions in said lines.
References Cited (Backward Citations)
US3381083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |