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公开(公告)号：ZA853261B
公开(公告)日：1985-12-24
申请号：ZA853261
申请日：1985-05-01
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM , WILLIS DONALD HENRY
IPC: H04N5/59 , H04N20060101 , H04N3/20 , H04N
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公开(公告)号：FI861991A
公开(公告)日：1986-11-21
申请号：FI861991
申请日：1986-05-13
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM
Abstract: Arc-over in the cathode ray tube (21) of a digital television receiver produces a large current pulse which, when it discharges via the chassis ground, disrupts the reference ground potentials of other circuitry coupled to the chassis ground. The affected circuitry includes digital data storage elements which may experience random state changes caused by the fluctuating ground potential. The CRT arc-over condition is detected by circuitry (460-466) which applies a pulse to the reset terminal of a microprocessor (440), causing it to restore the potentially corrupted data in the data storage elements using preset data stored in a less volatile programmable read only memory (452).
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公开(公告)号：AU579860B2
公开(公告)日：1988-12-15
申请号：AU4165985
申请日：1985-04-24
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM , WILLIS DONALD HENRY
Abstract: A beam current limiting (BCL) control apparatus for a digital television system includes a control unit (31) for reducing excessive beam currents, by controlling an analog-to-digital control means (3a) for the analog-to-digital converter (ADC) (3), which converts an analog composite video signal, including both luminance and chrominance components, to corresponding digital samples. The analog-to-digital control means (3a) can fulfil its function by controlling the reference voltage for the ADC (3). A switching circuit (33) may be included for preventing the reference voltage from being changed in response to the beam current during horizontal blanking intervals so as to inhibit interference with digital synchronization component detection and automatic chrominance control. A clamping circuit (35) is coupled to the ADC (3) to inhibit the conversion of portions of the composite video signal extending from the black level (0 IRE umts) to the sync tips from being affected by the BCL operation. This inhibits the BCL operation from adversely affecting the reproduction of details in dark portions of an image.
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公开(公告)号：FI861991A0
公开(公告)日：1986-05-13
申请号：FI861991
申请日：1986-05-13
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM
Abstract: Arc-over in the cathode ray tube (21) of a digital television receiver produces a large current pulse which, when it discharges via the chassis ground, disrupts the reference ground potentials of other circuitry coupled to the chassis ground. The affected circuitry includes digital data storage elements which may experience random state changes caused by the fluctuating ground potential. The CRT arc-over condition is detected by circuitry (460-466) which applies a pulse to the reset terminal of a microprocessor (440), causing it to restore the potentially corrupted data in the data storage elements using preset data stored in a less volatile programmable read only memory (452).
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Patent Agency Ranking
公开(公告)号：ZA8503261B
公开(公告)日：1985-12-24
申请号：ZA8503261
申请日：1985-05-01
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM , WILLIS DONALD HENRY
IPC: H04N5/59 , H04N20060101 , H04N3/20 , H04N
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公开(公告)号：DK196085D0
公开(公告)日：1985-05-01
申请号：DK196085
申请日：1985-05-01
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM , WILLIS DONALD HENRY
Abstract: A beam current limiting (BCL) control apparatus for a digital television system includes a control unit (31) for reducing excessive beam currents, by controlling an analog-to-digital control means (3a) for the analog-to-digital converter (ADC) (3), which converts an analog composite video signal, including both luminance and chrominance components, to corresponding digital samples. The analog-to-digital control means (3a) can fulfil its function by controlling the reference voltage for the ADC (3). A switching circuit (33) may be included for preventing the reference voltage from being changed in response to the beam current during horizontal blanking intervals so as to inhibit interference with digital synchronization component detection and automatic chrominance control. A clamping circuit (35) is coupled to the ADC (3) to inhibit the conversion of portions of the composite video signal extending from the black level (0 IRE umts) to the sync tips from being affected by the BCL operation. This inhibits the BCL operation from adversely affecting the reproduction of details in dark portions of an image.
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公开(公告)号：FI851632A0
公开(公告)日：1985-04-25
申请号：FI851632
申请日：1985-04-25
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM , WILLIS DONALD HENRY
Abstract: A beam current limiting (BCL) control apparatus for a digital television system includes a control unit (31) for reducing excessive beam currents, by controlling an analog-to-digital control means (3a) for the analog-to-digital converter (ADC) (3), which converts an analog composite video signal, including both luminance and chrominance components, to corresponding digital samples. The analog-to-digital control means (3a) can fulfil its function by controlling the reference voltage for the ADC (3). A switching circuit (33) may be included for preventing the reference voltage from being changed in response to the beam current during horizontal blanking intervals so as to inhibit interference with digital synchronization component detection and automatic chrominance control. A clamping circuit (35) is coupled to the ADC (3) to inhibit the conversion of portions of the composite video signal extending from the black level (0 IRE umts) to the sync tips from being affected by the BCL operation. This inhibits the BCL operation from adversely affecting the reproduction of details in dark portions of an image.
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公开(公告)号：AU5738686A
公开(公告)日：1986-11-27
申请号：AU5738686
申请日：1986-05-13
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM
Abstract: Arc-over in the cathode ray tube (21) of a digital television receiver produces a large current pulse which, when it discharges via the chassis ground, disrupts the reference ground potentials of other circuitry coupled to the chassis ground. The affected circuitry includes digital data storage elements which may experience random state changes caused by the fluctuating ground potential. The CRT arc-over condition is detected by circuitry (460-466) which applies a pulse to the reset terminal of a microprocessor (440), causing it to restore the potentially corrupted data in the data storage elements using preset data stored in a less volatile programmable read only memory (452).
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公开(公告)号：FI851632L
公开(公告)日：1985-11-03
申请号：FI851632
申请日：1985-04-25
Applicant: RCA CORP
Inventor： STOUGHTON JOHN WILLIAM , WILLIS DONALD HENRY
Abstract: A beam current limiting (BCL) control apparatus for a digital television system includes a control unit (31) for reducing excessive beam currents, by controlling an analog-to-digital control means (3a) for the analog-to-digital converter (ADC) (3), which converts an analog composite video signal, including both luminance and chrominance components, to corresponding digital samples. The analog-to-digital control means (3a) can fulfil its function by controlling the reference voltage for the ADC (3). A switching circuit (33) may be included for preventing the reference voltage from being changed in response to the beam current during horizontal blanking intervals so as to inhibit interference with digital synchronization component detection and automatic chrominance control. A clamping circuit (35) is coupled to the ADC (3) to inhibit the conversion of portions of the composite video signal extending from the black level (0 IRE umts) to the sync tips from being affected by the BCL operation. This inhibits the BCL operation from adversely affecting the reproduction of details in dark portions of an image.
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