Recording and reproducing system of a color television signal by using monochromic recording film

Claim 1

A method of recording and reproducing a color television signal comprising the steps of: superposing a sine-wave signal at both ends of each horizontal blanking period of a color video signal comprising the resultant signal resulting from combining a luminance information signal and a carrier chrominance information signal, which is a carrier wave modulated by color information signals; recording the color video signal onto a recording medium such that one field of the color video signal is recorded in one frame of the continuously running recording medium by a uni-dimensional scanning beam modulated by the color video signal; recording the carrier for reproducing the carrier chrominance information signal onto a portion of the recording medium where the color video signal is not recorded and which is placed between two successive frames of the recording medium recording the color video signal by said beam modulated according to the carrier; controlling the length and center position of a scanning line produced by said unidimensional scanning beam to maintain said scanning line in the same position, including: detecting deviations of positions of a sine-wave signal image produced by said sine-wave signals at each end of the scanning line to form control signals for adjusting the length and center position of said scanning line in relation to said deviations of said sine-wave signal image, and feeding back said control signals to a horizontal deflection circuit and a centering control circuit, respectively, to adjust the length and the center position of said scanning line; reproducing the thus recorded color video signal and carrier after photoelectric conversion by scanning them by flying scanning spot lights originated from one light source for the portion of the recording medium recording the color video signal and the portion thereof recording the carrier; and demodulating the carrier chrominance signal by using the reproduced carrier as a reference signal.

Claim 2

A method of recording and reproducing a color television signal comprising the steps of: superposing a sine-wave signal at both ends of each horizontal blanking period of a color video signal comprising the resultant signal resulting from combining a luminance information signal and a carrier chrominance information signal, which is a carrier wave modulated by color information signals; recording the color video signal onto a recording medium such that one field of the color video signal is recorded in one frame of the continuously running recording medium by a uni-dimensional scanning beam modulated by the color video signal; recording the carrier for reproducing the carrier chrominance information signal onto a portion of the recording medium where the color video signal is not recorded and which is placed between two successive frames of the recording medium recording the color video signal by said beam modulated according to the carrier; controlling the length and center position of a scanning line produced by said unidimensional scanning beam to maintain said scanning line in the same position, including: detecting deviations of positions of a sine-wave signal image produced by said sine-wave signals at each end of the scanning line to form control signals for adjusting the length and center position of said scanning line in relation to said deviations of said sine-wave signal image, and feeding back said control signals to a horizontal deflection circuit and a centering control circuit, respectively, to adjust the length and the center position of said scanning line; reproducing the thus recorded color video signal and carrier after photoelectric conversion by scanning them by flying scanning spot lights originated from one light source for the portion of the recording medium recording the color video signal and the portion thereof recording the carrier; and demodulating the carrier chrominance signal by using the reproduced carrier as a reference signal.

Claim 3

A method of recording and reproducing a color television signal comprising the steps of: superposing a sine-wave signal at both ends of each horizontal blanking period of a color video signal comprising the resultant signal resulting from combining a luminance information signal and a carrier chrominance information signal, which is a carrier wave modulated by color information signals; recording the color video signal onto a recording medium such that one field of the color video signal is recorded in one frame of the continuously running recording medium by a unidimensional scanning beam modulated by the color video signal; recording the carrier for reproducing the carrier chrominance information signal onto a portion of the recording medium where the color video signal is not recorded and which is placed between two successive frames of the recording medium recording the color video signal by said beam modulated according to the carrier; controlling the length and center position of a scanning line produced by said unidimensional scanning beam to maintain said scanning line in the same position, including: detecting deviations of positions of a sine-wave signal image produced by said sine-wave signals at each end of the scanning line to form control signals for adjusting the length and center position of said scanning line in relation to said deviations of said sine-wave signal image, and feeding back said control signals to a horizontal deflection circuit and a centering control circuit, respectively, to adjust the length and the center position of said scanning line; reproducing the thus recorded color video signal and carrier after photoelectric conversion by scanning them by flying scanning spot lights originated from one light source for the portion of the recording medium recording the color video signal and the portion thereof recording the carrier; and demodulating the carrier chrominance signal by using the reproduced carrier as a reference signal.

Claim 4

A method of recording and reproducing a color television signal comprising the steps of: superposing a sine-wave signal at both ends of each horizontal blanking period of a color video signal comprising the resultant signal resulting from combining a luminance information signal and a carrier chrominance information signal, which is a carrier wave modulated by color information signals; recording the color video signal onto a recording medium such that one field of the color video signal is recorded in one frame of the continuously running recording medium by a unidimensional scanning beam modulated by the color video signal; recording the carrier for reproducing the carrier chrominance information signal onto a portion of the recording medium where the color video signal is not recorded and which is placed between two successive frames of the recording medium recording the color video signal by said beam modulated according to the carrier; controlling the length and center position of a scanning line produced by said unidimensional scanning beam to maintain said scanning line in the same position, including: detecting deviations of positions of a sine-wave signal image produced by said sine-wave signals at each end of the scanning line to form control signals for adjusting the length and center position of said scanning line in relation to said deviations of said sine-wave signal image, and feeding back said control signals to a horizontal deflection circuit and a centering control circuit, respectively, to adjust the length and the center position of said scanning line; reproducing the thus recorded color video signal and carrier after photoelectric conversion by scanning them by flying scanning spot lights originated from one light source for the portion of the recording medium recording the color video signal and the portion thereof recording the carrier; and demodulating the carrier chrominance signal by using the reproduced carrier as a reference signal.

Claim 5

A device for recording a color television signal on a photosensitive record medium, comprising in combination: a carrier oscillator controlled by a horizontal driving signal; a vertical blanking signal generator controlled by a vertical driving signal; a first gate circuit connected to said carrier oscillator and controlled by a vertical blanking signal derived from said vertical blanking signal generator; a dual balanced modulator for providing a carrier chrominance signal by modulating a carrier supplied from said carrier oscillator with color difference signals obtained from color signals of the color television signal to be recorded; a combination circuit for producing a color video signal by combining said carrier chrominance signal onto a luminance signal derived from said color signals in a frequency interleaving manner and for superposing the carrier derived from said carrier oscillator and gated out via said first gate circuit onto said color video signal in a vertical blanking period; a front and back porch pulse generator controlled by the horizontal driving signal; a second gate circuit connected to said carrier oscillator and controlled by an output pulse of said front and back porch pulse generator to supply said carrier from said carrier oscillator to said combination circuit with a timing and for a period corresponding to front and back porches of a horizontal blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light having a brightness Of a spot which is modulated by said color video signal and said carrier supplied from said combination circuit; two sets of detecting means for photoelectrically detecting images of the carrier on both extreme ends of the uni-dimensional scanning light to produce detecting signals; means for forming sum and difference signals from said detecting signals to produce a center control signal representing a magnitude and a direction of deviation of a center position of said uni-dimensional scanning light and a scanning length control signal representing a magnitude and a direction of deviation of a length of said uni-dimensional scanning light, respectively; a centering control circuit for controlling the center of deflection of the uni-dimensional scanning light produced by said cathode ray tube with the aid of said center control signal; a horizontal deflection circuit for controlling the length of said uni-dimensional scanning light by means of said scanning length control signal; and a video signal recorder in which the photosensitive record medium is continuously driven at a speed corresponding to the vertical driving signal and said uni-dimensional scanning light produced by said cathode ray tube is projected on said photosensitive record medium to record each field of said color video signal in each frame of said record medium and to simultaneously record the carrier supplied to the cathode ray tube through said first gate circuit in each interval between successive frames and the carrier supplied to the cathode ray tube through said second gate circuit at both extreme ends of each frame of said record medium.

Claim 6

A device for recording a color television signal on a photosensitive record medium, comprising in combination: a carrier oscillator controlled by a horizontal driving signal; a vertical blanking signal generator controlled by a vertical driving signal; a first gate circuit connected to said carrier oscillator and controlled by a vertical blanking signal derived from said vertical blanking signal generator; a dual balanced modulator for providing a carrier chrominance signal by modulating a carrier supplied from said carrier oscillator with color difference signals obtained from color signals of the color television signal to be recorded; a combination circuit for producing a color video signal by combining said carrier chrominance signal onto a luminance signal derived from said color signals in a frequency interleaving manner and for superposing the carrier derived from said carrier oscillator and gated out via said first gate circuit onto said color video signal in a vertical blanking period; a front and back porch pulse generator controlled by the horizontal driving signal; a second gate circuit connected to said carrier oscillator and controlled by an output pulse of said front and back porch pulse generator to supply said carrier from said carrier oscillator to said combination circuit with a timing and for a period corresponding to front and back porches of a horizontal blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light having a brightness Of a spot which is modulated by said color video signal and said carrier supplied from said combination circuit; two sets of detecting means for photoelectrically detecting images of the carrier on both extreme ends of the uni-dimensional scanning light to produce detecting signals; means for forming sum and difference signals from said detecting signals to produce a center control signal representing a magnitude and a direction of deviation of a center position of said uni-dimensional scanning light and a scanning length control signal representing a magnitude and a direction of deviation of a length of said uni-dimensional scanning light, respectively; a centering control circuit for controlling the center of deflection of the uni-dimensional scanning light produced by said cathode ray tube with the aid of said center control signal; a horizontal deflection circuit for controlling the length of said uni-dimensional scanning light by means of said scanning length control signal; and a video signal recorder in which the photosensitive record medium is continuously driven at a speed corresponding to the vertical driving signal and said uni-dimensional scanning light produced by said cathode ray tube is projected on said photosensitive record medium to record each field of said color video signal in each frame of said record medium and to simultaneously record the carrier supplied to the cathode ray tube through said first gate circuit in each interval between successive frames and the carrier supplied to the cathode ray tube through said second gate circuit at both extreme ends of each frame of said record medium.

Claim 8

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of the color television signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames and at both sides of the frames, each of said intervals corresponding to a vertical blanking period of the color video signal and said both sides of the frames corresponding to front and back porches of a horizontal blanking period; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said unidimensional scanning light being a function of the horizontal scanning frequency of the color video signal; means for fixedly holding a record pattern which is substantially identical with the carrier pattern recorded in said intervals of said record medium; means for dividing said uni-dimensional scanning light into two identical uni-dimensional scanning lights and for directing a first one of said two uni-dimensional lights to the record medium and a second one of said two uni-dimensional scanning lights to said record pattern; means for receiving said first uni-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in the frame and the carrier recorded at both sides of the frames; means for receiving said second uni-dimensional scanning light transmitted through said record pattern to produce a carrier in the vertical blanking period; means for deriving a carrier chrominance signal and a luminance signal from said reproduced color video signal; means for producing a phase dIfference signal by comparing a phase of said reproduced carrier in the horizontal blanking period with that of said carrier produced by said record pattern in the vertical blanking period; means for varying the phase of said carrier produced by said record pattern in accordance with said phase difference signal so that the phase of the carrier produced by said record pattern follows phase variations of the reproduced carrier in the horizontal blanking period due to lateral displacement of the running record medium to produce a reference carrier having a phase which is always matched to that of the reproduced carrier chrominance signal; and means for demodulating color difference signals from said carrier chrominance signal with the aid of said reference carrier.

Claim 9

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of the color television signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames and at both sides of the frames, each of said intervals corresponding to a vertical blanking period of the color video signal and said both sides of the frames corresponding to front and back porches of a horizontal blanking period; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said unidimensional scanning light being a function of the horizontal scanning frequency of the color video signal; means for fixedly holding a record pattern which is substantially identical with the carrier pattern recorded in said intervals of said record medium; means for dividing said uni-dimensional scanning light into two identical uni-dimensional scanning lights and for directing a first one of said two uni-dimensional lights to the record medium and a second one of said two uni-dimensional scanning lights to said record pattern; means for receiving said first uni-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in the frame and the carrier recorded at both sides of the frames; means for receiving said second uni-dimensional scanning light transmitted through said record pattern to produce a carrier in the vertical blanking period; means for deriving a carrier chrominance signal and a luminance signal from said reproduced color video signal; means for producing a phase dIfference signal by comparing a phase of said reproduced carrier in the horizontal blanking period with that of said carrier produced by said record pattern in the vertical blanking period; means for varying the phase of said carrier produced by said record pattern in accordance with said phase difference signal so that the phase of the carrier produced by said record pattern follows phase variations of the reproduced carrier in the horizontal blanking period due to lateral displacement of the running record medium to produce a reference carrier having a phase which is always matched to that of the reproduced carrier chrominance signal; and means for demodulating color difference signals from said carrier chrominance signal with the aid of said reference carrier.

Claim 11

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of the color television signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames and at both sides of the frames, each of said intervals corresponding to a vertical blanking period of the color video signal and said both sides of the frames corresponding to front and back porches of a horizontal blanking period; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said uni-dimensional scanning light being a function of the horizontal scanning frequency of the color video signal; means for fixedly holding a record pattern which is substantially identical with the carrier pattern recorded in said intervals of said record medium; means for dividing said uni-dimensional scanning light into three identical uni-dimensional scanning lights and for directing first two of said three uni-dimensional scanning lights to two successive frames of the record medium and the last one of said three-dimensional scanning lights to said record pattern; means for receiving said first two uni-dimensional scanning lights transmitted through said successive frames of said record medium to reproduce the color video signals; means for receiving said last uni-dimensional scanning light transmitted through said record pattern to produce a carrier; means for deriving carrier chrominance signals and luminance signals from said reproduced color video signals; means for forming a difference signal of said carrier chrominance signals; means for forming a sum signal of said carrier chrominance signals; and means for synchronously detecting said difference and sum signals with the aid of a reference carrier having a phase correlated with said carrier produced by said record pattern.

Claim 12

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of the color television signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames and at both sides of the frames, each of said intervals corresponding to a vertical blanking period of the color video signal and said both sides of the frames corresponding to front and back porches of a horizontal blanking period; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said uni-dimensional scanning light being a function of the horizontal scanning frequency of the color video signal; means for fixedly holding a record pattern which is substantially identical with the carrier pattern recorded in said intervals of said record medium; means for dividing said uni-dimensional scanning light into three identical uni-dimensional scanning lights and for directing first two of said three uni-dimensional scanning lights to two successive frames of the record medium and the last one of said three-dimensional scanning lights to said record pattern; means for receiving said first two uni-dimensional scanning lights transmitted through said successive frames of said record medium to reproduce the color video signals; means for receiving said last uni-dimensional scanning light transmitted through said record pattern to produce a carrier; means for deriving carrier chrominance signals and luminance signals from said reproduced color video signals; means for forming a difference signal of said carrier chrominance signals; means for forming a sum signal of said carrier chrominance signals; and means for synchronously detecting said difference and sum signals with the aid of a reference carrier having a phase correlated with said carrier produced by said record pattern.

Claim 13

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of a color video signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames, each of said inteRvals corresponding to a vertical blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said uni-dimensional scanning light being a function of the horizontal scanning frequency of the color video signal; beam splitting means for dividing said uni-dimensional scanning light into two identical uni-dimensional scanning lights; optical means for converting one of said two uni-dimensional scanning lights into a two-dimensional scanning light by periodically deflecting said uni-dimensional scanning light along a running direction of said record medium during a period corresponding to a vertical scanning period of the color video signal; means for directing said two-dimensional scanning light to said record medium; means for directing the other of said two uni-dimensional scanning lights to said record medium; means for receiving said two-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in the frame of said record medium; means for receiving said uni-dimensional scanning light transmitted through said record medium to reproduce a carrier recorded in said intervals of said record medium; means for deriving carrier chrominance signals and luminance signals from said reproduced color video signals; and means for demodulating color difference signals from said carrier chrominance signal with the aid of a reference carrier having a phase correlated with said reproduced carrier.

Claim 14

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of a color video signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames, each of said inteRvals corresponding to a vertical blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said uni-dimensional scanning light being a function of the horizontal scanning frequency of the color video signal; beam splitting means for dividing said uni-dimensional scanning light into two identical uni-dimensional scanning lights; optical means for converting one of said two uni-dimensional scanning lights into a two-dimensional scanning light by periodically deflecting said uni-dimensional scanning light along a running direction of said record medium during a period corresponding to a vertical scanning period of the color video signal; means for directing said two-dimensional scanning light to said record medium; means for directing the other of said two uni-dimensional scanning lights to said record medium; means for receiving said two-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in the frame of said record medium; means for receiving said uni-dimensional scanning light transmitted through said record medium to reproduce a carrier recorded in said intervals of said record medium; means for deriving carrier chrominance signals and luminance signals from said reproduced color video signals; and means for demodulating color difference signals from said carrier chrominance signal with the aid of a reference carrier having a phase correlated with said reproduced carrier.

Claim 17

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of a color video signal recorded thereon, said record medium having recorded thereon successive field information in successive intervals between successive frames, each of said intervals corresponding to a vertical blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light including two different color components; a dichroic mirror for dividing said uni-dimensional scanning light into first and second uni-dimensional scanning lights of said two different color components; means for converting said second uni-dimensional scanning light into a wide width uni-dimensional scanning light; a rotating cylinder of transparent material having color filters of the same surface shape as that of the frame of said record medium, said color filters being able to transmit said first uni-dimensional scanning light and arranged on a part of a periphery of said cylinder with an interval corresponding to said interval between two successive frames of said record medium; means for continuously driving said record medium at a speed corresponding to a vertical scanning period of the color video signal along a part of the periphery of said cylinder; means for continuously rotating said cylinder at such a speed that a peripheral speed of said cylinder correspOnds to the running speed of said record medium; means for directing said first uni-dimensional scanning light through said color filters and said transparent cylinder to said record medium; means for directing said second wide width uni-dimensional scanning light through said intervals between said color filters and said transparent cylinder to said intervals between successive frames of said record medium; means for receiving said first uni-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in the frames of said record medium; means for receiving said second wide width uni-dimensional scanning light transmitted through said intervals between the frames of said record medium to reproduce a carrier; means for deriving a carrier chrominance signal and a luminance signal from said reproduced color video signal; and means for demodulating color difference signals from said carrier chrominance signal with the aid of a reference carrier having a phase correlated with said reproduced carrier.

Claim 18

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of a color video signal recorded thereon, said record medium having recorded thereon successive field information in successive intervals between successive frames, each of said intervals corresponding to a vertical blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light including two different color components; a dichroic mirror for dividing said uni-dimensional scanning light into first and second uni-dimensional scanning lights of said two different color components; means for converting said second uni-dimensional scanning light into a wide width uni-dimensional scanning light; a rotating cylinder of transparent material having color filters of the same surface shape as that of the frame of said record medium, said color filters being able to transmit said first uni-dimensional scanning light and arranged on a part of a periphery of said cylinder with an interval corresponding to said interval between two successive frames of said record medium; means for continuously driving said record medium at a speed corresponding to a vertical scanning period of the color video signal along a part of the periphery of said cylinder; means for continuously rotating said cylinder at such a speed that a peripheral speed of said cylinder correspOnds to the running speed of said record medium; means for directing said first uni-dimensional scanning light through said color filters and said transparent cylinder to said record medium; means for directing said second wide width uni-dimensional scanning light through said intervals between said color filters and said transparent cylinder to said intervals between successive frames of said record medium; means for receiving said first uni-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in the frames of said record medium; means for receiving said second wide width uni-dimensional scanning light transmitted through said intervals between the frames of said record medium to reproduce a carrier; means for deriving a carrier chrominance signal and a luminance signal from said reproduced color video signal; and means for demodulating color difference signals from said carrier chrominance signal with the aid of a reference carrier having a phase correlated with said reproduced carrier.

Claim 19

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of a color video signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames, each of said intervals corresponding to a vertical blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said uni-dimensional scanning light being a function of the horizontal scanning frequency of the color video signal; means for directing said uni-dimensional scanning light to said running record medium in a direction normal to the traveling direction of said record medium; means for receiving said uni-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in said frames of said record medium and a carrier recorded in said intervals between successive frames; means for separating a carrier chrominance signal and a luminance signal from said reproduced color video signal; means for generating a reference carrier by synchronously detecting said reproduced carrier; and means for demodulating color difference signals from said carrier chrominance signal with the aid of said reference carrier.

Claim 20

A device for reproducing a color television signal recorded on a photosensitive record medium, comprising: means for continuously driving said record medium at a speed corresponding to a vertical scanning period of a color video signal recorded thereon, said record medium having recorded thereon successive field information of the color video signal in successive frames and carrier information in successive intervals between successive frames, each of said intervals corresponding to a vertical blanking period of the color video signal; a cathode ray tube for producing a uni-dimensional scanning light of a constant brightness, a scanning frequency of said uni-dimensional scanning light being a function of the horizontal scanning frequency of the color video signal; means for directing said uni-dimensional scanning light to said running record medium in a direction normal to the traveling direction of said record medium; means for receiving said uni-dimensional scanning light transmitted through said record medium to reproduce the color video signal recorded in said frames of said record medium and a carrier recorded in said intervals between successive frames; means for separating a carrier chrominance signal and a luminance signal from said reproduced color video signal; means for generating a reference carrier by synchronously detecting said reproduced carrier; and means for demodulating color difference signals from said carrier chrominance signal with the aid of said reference carrier.