Compensation systems for cathode ray tube display systems

Claim 2

In a system in which a responsive means is to effect a desired response to a control signal which is derived from a command signal which dictates that said desired response be a fractional part of a selected zone bounded by first and second responses of predetermined magnitudes, command means for establishing an active command signal that defines said desired fractional part of said selected zone, control means for effecting said desired fractional part of within said selected zone comprising first means responsive to said command means for establishing first and second reference signals having values for evoking said first and second responses of said responsive means and second means responsive to said active command signal and to said first and second reference signals for deriving an active control signal for said responsive means having a value for effecting said desired fractional part in said selected zone.

Claim 3

In a system as set forth in claim 1 wherein the system is a display system, the responsive means is a cathode ray tube, the desired response is a substantially constant focusing response of said cathode ray tube regardless of the position of the electron beam of said cathode ray tube and the control signal is a focusing signal.

Claim 4

In a system as set forth in claim 1 wherein said system is a display system, the responsive means is a cathode ray tube, the desired response is a substantially linear positioning response of the electron beam of the tube and the control signal is a positioning signal.

Claim 5

In a system as set forth in claim 1 wherein said command signal comprises a selectable digital signal which uniquely represents one of said zones and said control means further comprises digital-to-analog converting means for converting a selected digital signal associated with said selected zone to an analog signal which when added to said active control signal will effect said desired fractional part of the response of said responsive means in said selected zone.

Claim 6

In a system as set forth in claim 1 wherein the system is a display system, the responsive means is a cathode ray tube, the desired response is a substantially constant focusing response of said cathode ray tube regardless of the position of the electron beam of said cathode ray tube and the control signal is a focusing signal.

Claim 7

In a system as set forth in claim 4 wherein said system is a display system, the responsive means is a cathode ray tube, the desired response is a substantially linear positioning response of the electron beam of the tube and the control signal is a positioning signal.

Claim 8

In a system as set forth in claim 6 further comprising means responsive to the command signal for compensating the intensity response of the cathode ray tube to obtain an intensity response which is appropriate for said desired fractional positioning response of said electron beam in said selected zone.

Claim 9

In a system in which a cathode ray tube having a non-linear positioning response of the electron beam and an undesired variable focusing response with respect to uncompensated positioning and focusing control signals is to have a linear positioning response of the electron beam and a predetermined focusing response with respect to a command signal which dictates that said desired positioning response of the electron beam be a fractional part of a selected positioning zone bounded by first and second positioning responses of the electron beam of predetermined magnitudes and that said desired focusing response be a fractional focusing response which is appropriate for said fractional part of said positioning response, command means for establishing an active command signal that defines said desired fractional part of said selected positioning zone, first control means for effecting said desired fractional part of said positioning response within said selected positioning zone comprising first means responsive to said command means for establishing first and second reference signals having values for evoking said first and second positioning responses of said cathode ray tube, second means responsive to said active command signal and to said first and second reference signals for deriving a compensated positioning control signal for said cathode ray tube having a value for effecting said desired fractional part of said positioning response of said electron beam within said selected positioning zone, second control means for effecting said desired fractional focusing response which is appropriate for said fractional positioning response of said electron beam in said selected zone comprising third means responsive to said command means for establishing third and fourth reference signals having values suitable for evoking first and second focusing responses of said cathode ray tube which appropriately correspond to said first and second positioning responses of said electron beam and fourth means responsive to said active command signal and to said third and fourth reference signals to derive a compensated focusing control signal having a value suitable for effecting said desired fractional focusing response of said cathode ray tube.

Claim 10

In a system in which a cathode ray tube having a non-linear positioning response of the electron beam and an undesired variable focusing response with respect to uncompensated positioning and focusing control signals is to have a linear positioning response of the electron beam and a predetermined focusing response with respect to a command signal which dictates that said desired positioning response of the electron beam be a fractional part of a selected positioning zone bounded by first and second positioning responses of the electron beam of predetermined magnitudes and that said desired focusing response be a fractional focusing response which is appropriate for said fractional part of said positioning response, command means for establishing an active command signal that defines said desired fractional part of said selected positioning zone, first control means for effecting said desired fractional part of said positioning response within said selected positioning zone comprising first means responsive to said command means for establishing first and second reference signals having values for evoking said first and second positioning responses of said cathode ray tube, second means responsive to said active command signal and to said first and second reference signals for deriving a compensated positioning control signal for said cathode ray tube having a value for effecting said desired fractional part of said positioning response of said electron beam within said selected positioning zone, second control means for effecting said desired fractional focusing response which is appropriate for said fractional positioning response of said electron beam in said selected zone comprising third means responsive to said command means for establishing third and fourth reference signals having values suitable for evoking first and second focusing responses of said cathode ray tube which appropriately correspond to said first and second positioning responses of said electron beam and fourth means responsive to said active command signal and to said third and fourth reference signals to derive a compensated focusing control signal having a value suitable for effecting said desired fractional focusing response of said cathode ray tube.

Claim 11

In a system as set forth in claim 8 further comprising means responsive to the command signal for compensating the intensity response of the cathode ray tube to obtain an intensity response which is appropriate for said desired fractional positioning response of said electron beam in said selected zone.

Claim 12

In a system as set forth in claim 9 wherein said command signal comprises a selectable digital signal which uniquely represents one of said zones and said control means further comprises digital-to-analog converting means for converting a selected digital signal associated with said selected zone to an analog signal which added to said active control signal will effect said desired fractional response of said responsive means in said selected zone.

Claim 13

In a system as set forth in claim 10 further comprising means responsive to the command signal for compensating the intensity response of the cathode ray tube to obtain an intensity response which is appropriate for said desired fractional positioning response of said electron beam in said selected zone.

Claim 14

In a system in which a cathode ray tube having an undesired intensity response with respect to an uncompensated intensity control signal is to have a desired appropriate intensity response with respect to a command signal which dictates a desired positioning response of the electron beam of said cathode ray tube, command means for establishing an active command signal that defines said desired positioning response of said electron beam and means responsive to said active command signal for deriving a compensated intensity control signal for said cathode ray tube having a valve which is suitable for effecting said desired intensity response of said cathode ray tube.

Claim 15

In a system in which a cathode ray tube having an undesired intensity response with respect to an uncompensated intensity control signal is to have a desired appropriate intensity response with respect to a command signal which dictates a desired positioning response of the electron beam of said cathode ray tube, command means for establishing an active command signal that defines said desired positioning response of said electron beam and means responsive to said active command signal for deriving a compensated intensity control signal for said cathode ray tube having a valve which is suitable for effecting said desired intensity response of said cathode ray tube.

Claim 16

In a system as set forth in claim 12 wherein said command means establishes an active command signal which defines a desired fractional positioning response within a selected positioning zone bounded by first and second positioning responses of predetermined magnitudes.

Claim 17

In a system in which graphical configurations are displayed on a cathode ray tube having deflection elements for positioning the electron beam of the cathode ray tube, comprising configuration generating means for generating graphical configurations to be displayed on the cathode ray tube, configuration positioning means for locating each of the displayed configurations on the face of the tube comprising accumulator means for controlling the position of the displayed configurations according to the desired display characteristics of said displayed configurations, first output means for providing a first positioning signal, first control means for sensing the status of said accumulator means, said first control means being operably connected to said first output means for controlling the value of said first positioning signal from said first output means, means for compensating for the non-linear positioning response characteristics of the cathode ray tube to said first positioning signal comprising second output means for providing a second positioning signal, second control means for sensing the status of said accumulator means, said second control means being operably connected to said second output means for controlling the value of said second positioning signal from said second output means, said second control means comprising command means for establishing an active command signal that defines a selected fractional part of a selected zone of said face of said tube which is bounded by first and second positioning responses of predetermined magnitudes and means for effecting a response within said zone comprising means responsive to said command means for establishing first and second reference signals having values for evoking said first and second positioning responses of said cathode ray tube and means responsive to said active command signal and to said first and second reference signals for deriving an active control signal for controlling said second output means to provide a second positioning signal for said cathode ray tube that has a value for effecting said desired fractional positioning response in said selected zone and means to combine the first positioning signal and the second positioning signal and to supply said combined signals to the deflection elements of said cathode ray tube to effect said desired fractional positioning response of said electron beam on the face of said tube in accordance with the status of said accumulator means.

Claim 18

In a system in which graphical configurations are displayed on a cathode ray tube having deflection elements for positioning the electron beam of the cathode ray tube, comprising configuration generating means for generating graphical configurations to be displayed on the cathode ray tube, configuration positioning means for locating each of the displayed configurations on the face of the tube comprising accumulator means for controlling the position of the displayed configurations according to the desired display characteristics of said displayed configurations, first output means for providing a first positioning signal, first control means for sensing the status of said accumulator means, said first control means being operably connected to said first output means for controlling the value of said first positioning signal from said first output means, means for compensating for the non-linear positioning response characteristics of the cathode ray tube to said first positioning signal comprising second output means for providing a second positioning signal, second control means for sensing the status of said accumulator means, said second control means being operably connected to said second output means for controlling the value of said second positioning signal from said second output means, said second control means comprising command means for establishing an active command signal that defines a selected fractional part of a selected zone of said face of said tube which is bounded by first and second positioning responses of predetermined magnitudes and means for effecting a response within said zone comprising means responsive to said command means for establishing first and second reference signals having values for evoking said first and second positioning responses of said cathode ray tube and means responsive to said active command signal and to said first and second reference signals for deriving an active control signal for controlling said second output means to provide a second positioning signal for said cathode ray tube that has a value for effecting said desired fractional positioning response in said selected zone and means to combine the first positioning signal and the second positioning signal and to supply said combined signals to the deflection elements of said cathode ray tube to effect said desired fractional positioning response of said electron beam on the face of said tube in accordance with the status of said accumulator means.

Claim 19

In a system as set forth in claim 14 further comprising means responsive to the command signal for compensating the intensity response of the cathode ray tube to obtain an intensity response which is appropriate for said desired fractional positioning response of said electron beam in said selected zone.

Claim 20

In a system as defined in claim 14 wherein the improvement further comprises compensating means for providing a compensated focusing control signal to said cathode ray tube, comprising means responsive to said command means for establishing third and fourth reference signals having values suitable for evoking a first and second focusing response of said cathode ray tube which appropriately respectively correspond to said first and second positioning responses of said electron beam and means responsive to said active command signal and to said third and fourth reference signals for deriving said compensated focusing control signal and for supplying said compensated focusing control signal to said cathode ray tube, said focusing control signal having a value which is appropriate for effecting fractional focusing response of said cathode ray tube which corresponds to said desired fractional positioning response of said electron beam in said selected zone.

Claim 21

In a system as set forth in claim 16 further comprising means responsive to the command signal for compensating the intensity response of the cathode ray tube to obtAin an intensity response which is appropriate for said desired fractional positioning response of said electron beam in said selected zone.

Claim 22

In a system in which a control signal is provided for evoking a response in a device which signal is to be compensated in dependency on the magnitude of a condition which varies over a range, the range being divided into a plurality of zones having end points, first circuit means for establishing first and second signals which have respective magnitudes dependent on the compensation required for said control signal for the end points of a selected zone and second circuit means responsive to said first and second signals for supplying a compensated control signal to said device, said device being a cathode ray tube and said condition is a desired position for the cathode ray beam along one deflection axis, the end points of said zones defining coarse positions of said beam along said axis, said control signal being a deflection signal for deflecting said beam along said axis and said system includes means for providing a linearly variable deflection signal for positioning said beam between said end points and said second circuit means includes interpolating means for interpolating between said first and second signals to provide a compensated deflection signal for positioning said beam between said end points.

Claim 23

In a system in which a control signal is provided for evoking a response in a device which signal is to be compensated in dependency on the magnitude of a condition which varies over a range, the range being divided into a plurality of zones having end points, first circuit means for establishing first and second signals which have respective magnitudes dependent on the compensation required for said control signal for the end points of a selected zone and second circuit means responsive to said first and second signals for supplying a compensated control signal to said device, said device being a cathode ray tube and said condition is a desired position for the cathode ray beam along one deflection axis, the end points of said zones defining coarse positions of said beam along said axis, said control signal being a deflection signal for deflecting said beam along said axis and said system includes means for providing a linearly variable deflection signal for positioning said beam between said end points and said second circuit means includes interpolating means for interpolating between said first and second signals to provide a compensated deflection signal for positioning said beam between said end points.

Claim 24

In a control system according to claim 18 in which said control signal is a signal for controlling the focus of said beam, said second circuit means comprising interpolating means for interpolating between said signals in accordance with the position of the beam between said end points to provide a compensated focusing signal.

Claim 25

In a system in which a control signal is provided for evoking a response in a device which signal is to be compensated in dependency on the magnitude of a condition which varies over a range, the range being divided into a plurality of zones having end points, first circuit means for establishing first and second signals which have respective magnitudes dependent on the compensation required for said control signal for the end points of a selected zone and second circuit means responsive to said first and second signals for supplying a compensated control signal to said device, said device being a cathode ray tube beam along one deflection axis, the end points of said zones defining coarse positions of said beam along said axis, there being a predetermined number of fine positions between adjacent coarse positions and the desired position is displaced from a coarse position by a fractional number N of said fine positions, said second circuit means comprising means for multiplying one of said signals by N and the other of said signals by N where N is the bit-by-bit complement of N.

Claim 26

In a system in which a control signal is provided for evoking a response in a device which signal is to be compensated in dependency on the magnitude of a condition which varies over a range, the range being divided into a plurality of zones having end points, first circuit means for establishing first and second signals which have respective magnitudes dependent on the compensation required for said control signal for the end points of a selected zone and second circuit means responsive to said first and second signals for supplying a compensated control signal to said device, said device being a cathode ray tube beam along one deflection axis, the end points of said zones defining coarse positions of said beam along said axis, there being a predetermined number of fine positions between adjacent coarse positions and the desired position is displaced from a coarse position by a fractional number N of said fine positions, said second circuit means comprising means for multiplying one of said signals by N and the other of said signals by N where N is the bit-by-bit complement of N.

Claim 27

In a control system according to claim 20 wherein said system includes a multi-digit binary number having fine digits specifying said fractional number and coarse digits which define the end points of said zones as coarse positions numbered with respect to a reference whereby each zone has odd numbered and even numbered end points with the lower numbered end points of said zones alternating between even and odd when proceeding from the reference, and wherein said first circuit means comprises an odd circuit means establishing the one of said first and second signals for the odd numbered coarse position and even numbered circuit means for establishing the one of said first and second signals corresponding to the even numbered coarse position, said second circuit means comprising a first and second digital-to-analog converters for multiplying the signals by N and N, one of said converters being connected to said odd circuit means and one being connected to said even circuit means, and means responsive to said coarse digits to set the converters to multiply by N or N selectively depending upon whether the odd or even end point is the higher numbered end point from the reference.