Anti-pairing system for a television receiver

Claim 5

A method as defined in claim 2 wherein the predetermined delay interval associated with said first delayed pulse train is approximately equal to one-quarter of a horizontal line period and each vertical-rate pulse within said initial pulse train exhibits a fixed predetermined phase relationship to the horizontal flyback pulses which insures that the trailing edge of each pulse in said first and second delayed pulse train is not overlapped by any horizontal flyback pulse.

Claim 6

A method as defined in claim 2 wherein the predetermined delay interval associated with said first delayed pulse train is substantially within the range of one-tenth to four-tenths of a horizontal line period.

Claim 7

A method as defined in claim 2 wherein the predetermined delay interval associated with said first delayed pulse train is a multiple of 1/2 of the horizontal line period plus between 10 and 40 percent of a horizontal line.

Claim 8

An anti-pairing system for improving interlace between the horizontal scan lines of alternate raster fields of a television receiver in which vertical and horizontal deflection systems control the scan of an electron beam on a cathode-ray tube and in which a horizontal flyback pulse is generated during the horizontal retrace period, comprising: means for generating a train of vertical ramp waveforms to be applied to the vertical deflection system of the television receiver for causing the electron beam to be vertically deflected in synchronism with a received television signal; and means for displacing the start of the vertical ramp waveforms with respect tO the horizontal flyback pulses by a predetermined interval effective to insure that the beginnings of the vertical ramp waveforms for either field are not overlapped by a horizontal flyback pulse, whereby any components of the horizontal flyback pulse which are induced into a vertical ramp waveform occur at a time when their inclusion does not cause the lines of one field to pair with the line of the alternate field.

Claim 9

An anti-pairing system for improving interlace between the horizontal scan lines of alternate raster fields of a television receiver in which vertical and horizontal deflection systems control the scan of an electron beam on a cathode-ray tube and in which a horizontal flyback pulse is generated during the horizontal retrace period, comprising: means for generating a train of vertical ramp waveforms to be applied to the vertical deflection system of the television receiver for causing the electron beam to be vertically deflected in synchronism with a received television signal; and means for displacing the start of the vertical ramp waveforms with respect tO the horizontal flyback pulses by a predetermined interval effective to insure that the beginnings of the vertical ramp waveforms for either field are not overlapped by a horizontal flyback pulse, whereby any components of the horizontal flyback pulse which are induced into a vertical ramp waveform occur at a time when their inclusion does not cause the lines of one field to pair with the line of the alternate field.

Claim 10

An anti-pairing system for improving interlace between the horizontal scan lines of alternate raster fields of a television receiver in which vertical and horizontal deflection systems control the scan of an electron beam on a cathode-ray tube and in which a horizontal flyback pulse is generated during the horizontal retrace period, comprising: means for generating an initial train of vertical-rate pulses, each of which has a duration equal to an integral number of horizontal periods and is separated in time from every other vertical-rate pulse by an integral number of horizontal periods; means for delaying the start of each vertical-rate pulse of the initial train a predetermined delay interval to form a first delayed pulse train; means for delaying said first delayed pulse train by 1/2 a horizontal line to form a second delayed pulse train, said predetermined delay interval being chosen to insure that the trailing edge of each pulse in said first and second delayed pulse trains is not overlapped by any horizontal flyback pulse; and means for alternately choosing a pulse from said first and second delayed pulse trains for application to the vertical deflection system.

Claim 11

An anti-pairing system for improving interlace between the horizontal scan lines of alternate raster fields of a television receiver in which vertical and horizontal deflection systems control the scan of an electron beam on a cathode-ray tube and in which a horizontal flyback pulse is generated during the horizontal retrace period, comprising: means for generating an initial train of vertical-rate pulses, each of which has a duration equal to an integral number of horizontal periods and is separated in time from every other vertical-rate pulse by an integral number of horizontal periods; means for delaying the start of each vertical-rate pulse of the initial train a predetermined delay interval to form a first delayed pulse train; means for delaying said first delayed pulse train by 1/2 a horizontal line to form a second delayed pulse train, said predetermined delay interval being chosen to insure that the trailing edge of each pulse in said first and second delayed pulse trains is not overlapped by any horizontal flyback pulse; and means for alternately choosing a pulse from said first and second delayed pulse trains for application to the vertical deflection system.

Claim 12

A system as defined in claim 7 wherein the predetermined delay interval associated with said first delayed pulse train is approximately equal to one-quarter of a horizontal line period and each vertical-rate pulse within said initial pulse train exhibits a fixed predetermined phase relationship to the horizontal flyback pulses which insures that the trailing edge of each pulse in said first and second delayed pulse train is not overlapped by any horizontal flyback pulse.

Claim 13

A system as defined in claim 7 wherein the predetermined delay interval associated with said first delayed pulse train is within the range of 1/10 to 4/10 of a horizontal line period.

Claim 14

A method as defined in claim 7 wherein the predetermined delay interval associated with said first delayed pulse train is a multiple of 1/2 of the horizontal line period plus between 10 and 40 percent of a horizontal line.

Claim 15

In a television receiver having a vertical deflection system for controlling the vertical scan of an electron beam on a cathode-ray tube in synchronism with a received vertical sync pulse, and in which a horizontal flyback pulse is generated during a horizontal retrace period, the combination comprising: a pulse generator including a D-type flip flop whose D input consists of integrated vertical sync pulses, whose clock input consists of horizontal flyback pulses, and whose output is a train of vertical-rate pulses synchronized to the flyback pulses; first delay means coupled to the output of said pulse generator for delaying each vertical-rate pulse by a predetermined delay interval; second delay means coupled to the output of said first delay means for delaying each vertical-pulse an additional 1/2 horizontal line period; and selector means receiving the vertical-rate pulses appearing at the outputs of said first and second delay means and responsive to the pulse generator output for alternately selecting the vertical-rate pulses from said first and second delay means for application to said vertical deflection system, said predetermined delay interval being chosen to insure that the trailing edges of all vertical-rate pulses appearing at the outputs of said first and second delay means are not overlapped by any horizontal flyback pulses so that any components of a horizontal flyback pulse which are induced into the vertical Deflection system occur at a time when their inclusion does not cause the lines of one field to pair with the lines of the alternate field.

Claim 16

In a television receiver having a vertical deflection system for controlling the vertical scan of an electron beam on a cathode-ray tube in synchronism with a received vertical sync pulse, and in which a horizontal flyback pulse is generated during a horizontal retrace period, the combination comprising: a pulse generator including a D-type flip flop whose D input consists of integrated vertical sync pulses, whose clock input consists of horizontal flyback pulses, and whose output is a train of vertical-rate pulses synchronized to the flyback pulses; first delay means coupled to the output of said pulse generator for delaying each vertical-rate pulse by a predetermined delay interval; second delay means coupled to the output of said first delay means for delaying each vertical-pulse an additional 1/2 horizontal line period; and selector means receiving the vertical-rate pulses appearing at the outputs of said first and second delay means and responsive to the pulse generator output for alternately selecting the vertical-rate pulses from said first and second delay means for application to said vertical deflection system, said predetermined delay interval being chosen to insure that the trailing edges of all vertical-rate pulses appearing at the outputs of said first and second delay means are not overlapped by any horizontal flyback pulses so that any components of a horizontal flyback pulse which are induced into the vertical Deflection system occur at a time when their inclusion does not cause the lines of one field to pair with the lines of the alternate field.

Claim 17

The combination defined by claim 11 wherein said predetermined delay interval is approximately 1/4 of a horizontal line period.

Claim 18

The combination defined by claim 11 wherein said predetermined delay interval is within the range of 1/10 to 4/10 of a horizontal line period.

Claim 19

The combination defined by claim 11 wherein said predetermined delay interval is a multiple of 1/2 of the horizontal line period plus between 10 and 40 percent of a horizontal line.

Claim 20

An anti-pairing system for improving interlace between the horizontal scan lines of alternate raster fields of a television receiver in which vertical and horizontal deflection systems control the scan of an electron beam on a cathode-ray tube and in which a horizontal flyback pulse is generated during the horizontal retrace period, comprising: means for generating a train of vertical ramp waveforms to be applied to the vertical deflection system of the television receiver for causing the electron beam to be vertically deflected in synchronism with a received television signal; and means for displacing the vertical ramp waveforms in time with respect to the horizontal flyback pulses by a predetermined delay interval equal to a multiple of 1/2 of the horizontal line period plus between 10 and 40 percent of a horizontal line.

Claim 21

An anti-pairing system for improving interlace between the horizontal scan lines of alternate raster fields of a television receiver in which vertical and horizontal deflection systems control the scan of an electron beam on a cathode-ray tube and in which a horizontal flyback pulse is generated during the horizontal retrace period, comprising: means for generating a train of vertical ramp waveforms to be applied to the vertical deflection system of the television receiver for causing the electron beam to be vertically deflected in synchronism with a received television signal; and means for displacing the vertical ramp waveforms in time with respect to the horizontal flyback pulses by a predetermined delay interval equal to a multiple of 1/2 of the horizontal line period plus between 10 and 40 percent of a horizontal line.