公开(公告)号：ZA843856B

公开(公告)日：1984-12-24

申请号：ZA843856

申请日：1984-05-22

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY

IPC: H04N9/64 ,  H04N9/68 ,  H04N5/59 ,  H04N9/73 ,  H04N ,  G05B

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.

公开(公告)号：FI67005C

公开(公告)日：1984-12-10

申请号：FI790353

申请日：1979-02-02

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY

IPC: H04N3/18 ,  H04N5/59 ,  H04N3/20

公开(公告)号：FR2546689A1

公开(公告)日：1984-11-30

申请号：FR8408149

申请日：1984-05-24

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY ,  FLING RUSSELL THOMAS

IPC: H03M1/20 ,  H03M1/00 ,  H03K13/02 ,  H04N5/14 ,  H04N7/13

Abstract: Digital representations of analog signals are limited in resolution accuracy by the number of bits in the digital output signal of an analog-to-digital converter which limits the number of analog output levels produceable by a digital-to-analog converter. The apparent resolution accuracy can be improved, however, by the addition of two "dithering" signals, one at a lower frequency and one at a higher frequency, to increase the number of transitions of the least significant bit (LSB) of the digital signals. In a television receiver employing digital signal processing apparatus, dither signals having magnitudes equivalent to 1/2 and 1/4 LSB and at frequencies related to the TV line frequency and the color subcarrier frequency are preferred.

公开(公告)号：DE3419640A1

公开(公告)日：1984-11-29

申请号：DE3419640

申请日：1984-05-25

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 ,  H03K13/01 ,  H04N7/13 ,  H04N9/02

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.

公开(公告)号：DE3419282A1

公开(公告)日：1984-11-29

申请号：DE3419282

申请日：1984-05-23

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY

IPC: H04N5/59 ,  H04N9/64 ,  H04N9/68 ,  H04N9/73 ,  H04N3/18 ,  H04N9/535

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.

公开(公告)号：GB2120059A

公开(公告)日：1983-11-23

申请号：GB8317783

申请日：1982-11-05

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY

IPC: H04N3/18 ,  G05F1/38 ,  H04N3/185 ,  H04N5/00 ,  H04N5/44 ,  H04N5/68

Abstract: In a television receiver regulated power supply that is responsive to the state of a remote on/off command signal, the AC mains supply voltage is connected to the input terminals of a bridge rectifier through the mechanical switch portion of an on/off relay. A remote control circuit energizes the relay coil to close the mechanical switch upon receipt of the on-state command signal. The bridge rectifier then develops an unregulated DC voltage that is applied to a high frequency inverter for developing an alternating polarity input voltage. The alternating polarity input voltage is applied to a self-regulating or ferroresonant power supply circuit to produce regulated output voltages for various television receiver load circuits such as the ultor load and the horizontal deflection circuit. During a fault operating condition of the self-regulating circuit wherein the output voltages would tend to increase excessively, a protection circuit detects the occurrence of the fault operating condition and disables the remote control circuit to deenergize the relay coil and open the mechanical on/off switch. Operation of the self-regulating circuit stops to thereby deenergize the television receiver load circuits.

公开(公告)号：FI832541L

公开(公告)日：1983-07-12

申请号：FI832541

申请日：1983-07-12

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY

IPC: H04N3/18 ,  G05F1/38 ,  H04N3/185 ,  H04N5/00 ,  H04N

Abstract: In a television receiver regulated power supply that is responsive to the state of a remote on/off command signal, the AC mains supply voltage is connected to the input terminals of a bridge rectifier through the mechanical switch portion of an on/off relay. A remote control circuit energizes the relay coil to close the mechanical switch upon receipt of the on-state command signal. The bridge rectifier then develops an unregulated DC voltage that is applied to a high frequency inverter for developing an alternating polarity input voltage. The alternating polarity input voltage is applied to a self-regulating or ferroresonant power supply circuit to produce regulated output voltages for various television receiver load circuits such as the ultor load and the horizontal deflection circuit. During a fault operating condition of the self-regulating circuit wherein the output voltages would tend to increase excessively, a protection circuit detects the occurrence of the fault operating condition and disables the remote control circuit to deenergize the relay coil and open the mechanical on/off switch. Operation of the self-regulating circuit stops to thereby deenergize the television receiver load circuits.

公开(公告)号：ZA8202657B

公开(公告)日：1983-06-29

申请号：ZA8202657

申请日：1982-04-19

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY

IPC: H04N3/18 ,  H01J29/70 ,  H01J29/76 ,  H04N20060101 ,  H04N3/185 ,  H01J ,  G05F

CPC classification number: H04N3/185

公开(公告)号：DE3248293T1

公开(公告)日：1983-06-01

申请号：DE3248293

申请日：1982-05-26

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY ,  CLAYBURN RANDALL CROSS

IPC: H04N3/18 ,  G03F7/20 ,  G05F3/06 ,  H01F20060101 ,  H01F17/04 ,  H01F17/06 ,  H01F19/04 ,  H01F27/00 ,  H01F27/42 ,  H01J29/70 ,  H01J29/76 ,  H01J29/98 ,  H04N3/185

Abstract: The primary of a transformer with a high leakage inductance is coupled to an unregulated alternating voltage source. The output voltage from a secondary winding is full wave rectified by diodes and filtered by a capacitor to provide a voltage for the audio circuits. The voltage developed in another secondary winding is full wave rectified and is filtered by a capacitor to provide a voltage for the tube grid circuits. A separate winding is used to provide the EHT supply. The output windings are tightly coupled magnetically and their output voltages are controlled by a saturable reactor connected to the tube grid supply winding. This reactor comprises a winding on a magnetically saturable core and coupled to a resonating capacitor. A permanent magnet polarises the core to stabilise the output voltages against temp. effects.

公开(公告)号：FI824361A0

公开(公告)日：1982-12-17

申请号：FI824361

申请日：1982-12-17

Applicant: RCA CORP

Inventor： WILLIS DONALD HENRY

IPC: H04N3/18 ,  H01J29/70 ,  H01J29/76 ,  H04N20060101 ,  H04N3/185 ,  H04N

Abstract: The primary winding of a high leakage inductance transformer is coupled to a source of alternating input voltage to develop alternating polarity output voltages across tightly coupled secondary windings, including a high voltage winding of the transformer. Various DC supply voltages, including the ultor voltage, are derived from the secondary winding output voltages. To regulate the secondary winding output voltages, a ferroresonant circuit comprising a capacitor and a saturable reactor is coupled as a load circuit to one of the transformer secondary windings. When the saturable reactor magnetically saturates during each half cycle of the alternating polarity output voltage, a circulating current is generated and flows between the saturable reactor and the capacitor. To enhance the power supply efficiency and reduce the temperature rise within the magnetizable core of the saturable reactor, the parameters of the transformer and ferroresonant load circuit are selected so as to generate a relatively low amplitude circulating current. To improve output voltage regulation when a low amplitude circulating current is developed, a compensating drive winding is provided that is magnetically tightly coupled with the primary winding of the high leakage transformer. The compensating drive winding is coupled in series with the saturable reactor winding across the capacitor and polarized relative to the capacitor coupled transformer secondary so as to oppose the tendency of the output voltage amplitude or half-cycle volt-second area to vary with variations in input voltage amplitude.