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公开(公告)号：AU4027885A
公开(公告)日：1985-10-17
申请号：AU4027885
申请日：1985-03-22
Applicant: RCA CORP
Inventor： FLING RUSSELL THOMAS , WILLIS DONALD HENRY , MCNEELY DAVID LOWELL
Abstract: A signal overload circuit for use in e.g. a digital TV receiver includes a piecewise linear weighting circuit which weights samples of greater magnitude proportionately more heavily than samples of lesser magnitude. The weighted samples are applied to an accumulator, and the accumulated value over a field interval is compared to an overload reference value to generate an overload output signal which is combined with other gain factors for application as the common gain control signal to a common amplifier. The overload detector is coupled in a feedback loop around the common amplifier. In order not to defeat the function of the other gain factors, the overload detector is programmable and its sensitivity is made responsive to the other gain factors.
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公开(公告)号：FI851374L
公开(公告)日：1985-10-13
申请号：FI851374
申请日：1985-04-04
Applicant: RCA CORP
Inventor： FLING RUSSELL THOMAS , WILLIS DONALD HENRY , MCNEELY DAVID LOWELL
Abstract: A signal overload circuit for use in e.g. a digital TV receiver includes a piecewise linear weighting circuit which weights samples of greater magnitude proportionately more heavily than samples of lesser magnitude. The weighted samples are applied to an accumulator, and the accumulated value over a field interval is compared to an overload reference value to generate an overload output signal which is combined with other gain factors for application as the common gain control signal to a common amplifier. The overload detector is coupled in a feedback loop around the common amplifier. In order not to defeat the function of the other gain factors, the overload detector is programmable and its sensitivity is made responsive to the other gain factors.
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公开(公告)号：GB2155739A
公开(公告)日：1985-09-25
申请号：GB8505949
申请日：1985-03-07
Applicant: RCA CORP
Inventor： WILLIS DONALD HENRY
Abstract: In a digital video signal processing system including an image reproducing kinescope and a digital-to-analog converter (DAC), excessive kinescope beam current are automatically limited in response to a control signal which varies a reference voltage for the DAC such that the peak-to-peak amplitude of analog video signals from the DAC is reduced. A version of the control signal is applied to the output of the DAC with a magnitude and polarity for substantially negating unwanted shifts of the video signal black level during the beam current limiting mode.
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公开(公告)号：AU546623B2
公开(公告)日：1985-09-12
申请号：AU7349881
申请日：1981-07-28
Applicant: RCA CORP
Inventor： LUZ DAVID WARREN , WILLIS DONALD HENRY
Abstract: A primary winding of a power transformer is coupled to a source of DC voltage. First and second controllable switches are coupled to the primary winding in a push-pull arrangement. A control circuit responsive to a deflection rate input signal that is synchronized with deflection circuit scanning applies a turn-off switching signal alternately to the two controllable switches during each deflection cycle. In response to the turnoff of each one of the two controllable switches, a turn-on switching signal is applied to the other switch to develop a deflection rate alternating polarity output voltage across an output winding of the power transformer. The output voltage is rectified and applied to a deflection generator to thereby energize the generator into developing scanning current in a deflection winding.
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公开(公告)号：FI850856L
公开(公告)日：1985-09-09
申请号：FI850856
申请日：1985-03-01
Applicant: RCA CORP
Inventor： WILLIS DONALD HENRY
Abstract: In a digital video signal processing system including an image reproducing kinescope and a digital-to-analog converter (DAC), excessive kinescope beam current are automatically limited in response to a control signal which varies a reference voltage for the DAC such that the peak-to-peak amplitude of analog video signals from the DAC is reduced. A version of the control signal is applied to the output of the DAC with a magnitude and polarity for substantially negating unwanted shifts of the video signal black level during the beam current limiting mode.
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Patent Agency Ranking
公开(公告)号：DK148110C
公开(公告)日：1985-08-05
申请号：DK52379
申请日：1979-02-08
Applicant: RCA CORP
Inventor： WILLIS DONALD HENRY
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公开(公告)号：GB2148559A
公开(公告)日：1985-05-30
申请号：GB8430038
申请日：1984-11-28
Applicant: RCA CORP
Inventor： WILLIS DONALD HENRY
Abstract: A television system for developing a regulated B + scan supply voltage includes a deflection generator (40) with a deflection winding (41); a transformer (22) having a primary winding (22a) coupled to a source (21) of unregulated alternating input voltage for developing across secondary windings (22c, d) an alternating voltage that tends to vary with variations of the unregulated voltage; means (27, 28) responsive to the secondary winding alternating voltage for developing a B + scan supply voltage; and means (32, 39) for applying the B + scan supply voltage to the deflection generator (40) to develop scanning current in the deflection winding. A saturable core (137) with a load coil (37) wound on it is conductively coupled to and magnetically isolated from the transformer secondary windings (22c, d). The load coil (37) is responsive to, and provides regulation of, the transformer secondary winding alternating voltage for developing the regulated B + scan supply voltage.
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公开(公告)号：FI851374A0
公开(公告)日：1985-04-04
申请号：FI851374
申请日：1985-04-04
Applicant: RCA CORP
Inventor： FLING RUSSELL THOMAS , WILLIS DONALD HENRY , MCNEELY DAVID LOWELL
Abstract: A signal overload circuit for use in e.g. a digital TV receiver includes a piecewise linear weighting circuit which weights samples of greater magnitude proportionately more heavily than samples of lesser magnitude. The weighted samples are applied to an accumulator, and the accumulated value over a field interval is compared to an overload reference value to generate an overload output signal which is combined with other gain factors for application as the common gain control signal to a common amplifier. The overload detector is coupled in a feedback loop around the common amplifier. In order not to defeat the function of the other gain factors, the overload detector is programmable and its sensitivity is made responsive to the other gain factors.
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公开(公告)号：FR2546699A1
公开(公告)日：1984-11-30
申请号：FR8407967
申请日：1984-05-22
Applicant: RCA CORP
Inventor： WILLIS DONALD HENRY
Abstract: A color television receiver includes a network for automatically limiting excessive kinescope beam currents developed in response to video signal image information, and a white balance control network for automatically controlling the white level drive (gain) characteristics of the kinescope in response to a white drive reference signal applied to the video signal path during given measuring intervals. A control signal developed by the beam current limiter network, otherwise applied to the video signal path, is decoupled from the video signal path during the white level measuring intervals to prevent distortion of the white level control function.
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公开(公告)号：FR2546698A1
公开(公告)日：1984-11-30
申请号：FR8408150
申请日：1984-05-24
Applicant: RCA CORP
Inventor： WILLIS DONALD HENRY , FUHRER JACK SELIG
IPC: H04N1/405 , G06F17/10 , G06T5/00 , G06T9/00 , H03H17/02 , H03M1/04 , H03M1/20 , H03M7/30 , H03M7/36 , H04N9/64 , H04N11/04 , H04N5/14 , H04N7/13
Abstract: The present invention provides for the generation of digitally dithered digital signals which can have an apparent quantizing resolution unaffected by truncation of the least significant bit. The truncated digital signal is dithered in an ordered fashion by adding thereto a bit developed in response to one condition of the truncated bit and is not dithered in response to another condition thereof. The original digital signal can be reconstructed by combining successive samples of the truncated digital signals. One feature of the present invention provides a truncation of digital signals.
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