Two-sided video disc having high definition television video signals recorded thereon and a method of manufacturing the same

A method of manufacturing a two-side video disc having HDTV signals recorded thereon comprising the steps of:

• supplying a line sequential color HDTV video signal,
• distributing said line sequential color HDTV video signal alternately by a horizontal line period to form a first video signal including a first color signal component,
• distributing said line sequential color HDTV video signal alternately by a horizontal line period to form a second video signal including a second color signal component,
• recording said first video signal on a single side face of a first disc rotating in a first direction,
• recording said second video signal on a single side face of a second disc rotating in a second direction opposite to said first direction,
• duplicating said first disc having said first video signal recorded onto a face of a first duplicate disc,
• duplicating said second disc having said second video signal recorded onto a face of a second duplicate disc, and
• bonding and securing said first and second duplicate discs obtained by duplicating said first and second discs, thereby forming the two-sided video disc.

A recording apparatus of a two-side video disc comprising:

• means (1) for supplying a HDTV video signal of a wide band and for supplying a related address signal having an address code therein,
• means (4, 5, 6, 7, 8, 9, 10, 11, 12) for forming a first video signal of a narrow band including a first color signal component and a second video signal of a narrow band including a second color signal component, based on said HDTV video signal,
• means (13) for generating a reference signal having a frequency changing according to said address signal,
• disc motor means (20) for rotating in one direction at the time of recording of a top side face disc of the two-side video disc, and rotating in an opposite direction at the time of recording of a back side face disc of said two-side video disc, said top side face disc and said back side face disc being subsequently bonded to form said two-sided video disc,
• means (20, 21, 22) for controlling the rotating speed of said disc motor means based on rotating information provided by said disc motor means and said reference signal, and
• means (16, 17, 18) for optically recording said first video signal on said top side face disc at the time of recording of said top side face disc, and optically recording said second video signal on said back side face disc at the time of recording of said back side face disc.

A recording apparatus of a two-side video disc comprising:

• means (1) for supplying a HDTV video signal of a wide band,
• means (3) for forming a first video signal of a narrow band including a first color signal component and a second video signal of a narrow band including a second color signal component, based on said HDTV video signal,
• means (17a, 17b) for optically recording said first and second video signals simultaneously on top side face and back side face discs (D1, D2), respectively,
• means (60, 61, 62, 63) for generating a reference signal having a frequency changing according to the position of said optical recording means, said reference signal being generated based upon a position of the means for optically recording the first and second video signals,
• first and second disc motor means (20a, 20b) coupled to said reference signal generator means for simultaneously rotating said top side face disc in one direction and said back side face disc in an opposite direction, respectively, at the time of recording said first and second video signals, and
• means (21a, 21b, 22a, 22b) for controlling the rotating angular speed of said first and second disc motor means based on said frequency of said reference signal so that recording angular velocities of said top side face disc and said back side face disc are equal to each other, said top side face disc and said back side face disc being subsequently bonded together to form the two-sided video disc.

A reproduction apparatus of a high definition two-side video disc, said high definition two-side video disc comprising a first recording face having a first video signal including a first color signal component recorded, said first video signal being formed by distributing a line sequential color HDTV video signal alternately by a horizontal line period;

• and a second recording face having a second video signal including a second color signal component recorded, said second color signal being substantially synchronized in the rotating direction with respect to said first video signal of said first recording face, said second video signal being formed by distributing said line sequential color HDTV video signal alternately by a horizontal line period;
• said reproduction apparatus comprising:
• means (24, 25, 26, 27, 28, 29) for optically reproducing simultaneously said first and second video signals from said first and second recording faces of said high definition two-side video disc,
• means (40, 41, 42, 43, 44, 45) for temporarily storing at least one of said reproduced first and second video signals to make the timings of said first and second video signals coincide with each other, and
• means (48, 49, 50, 51, 52, 53) for combining said first and second video signals having the timings coincide with each other to restore said HDTV video signal.