Recording/reproducing compressed data on a rotatable record medium in which at least one intraframe code signal and at least (n-1) interframe code signals are recorded in each track

A method of reproducing image data from successive turns on a rotatable record medium driven at substantially constant linear velocity, wherein said image data has been recorded as an intraframe code signal representing an image frame followed by a number of successive interframe code signals representing an equal number of successive image frames, with said number of interframe code signals in a turn being at least as large as the capacity of interframe code signals recordable in an innermost turn, said method comprising:

• reproducing the intraframe and interframe code signals in each turn;
• coupling the reproduced code signals to an intraframe decoder to recover image data therefrom;
• coupling the reproduced code signals to an interframe decoder to recover image data therefrom;
• sensing if an intraframe or interframe code signal is reproduced;
• and changing over the reproduced code signals between the intraframe decoder and the interframe decoder as a function of whether the intraframe or interframe code signal is sensed as being reproduced.

A method of recording image data in successive turns on a rotatable medium driven at substantially constant linear velocity, comprising:

• receiving successive image frames of said image data;
• converting a first of said image frames of image data to an intraframe code signal;
• converting m succeeding image frames of image data to m interframe code signals, wherein m is a variable integer depending upon the particular turn in which the intraframe and interframe code signals are recorded;
• and recording the intraframe code signal and m interframe code signals on said medium.

A method of reproducing image data from successive turns on a rotatable record medium driven at substantially constant linear velocity, wherein said image data has been recorded on said medium as an intraframe code signal representing an image frame followed by a m successive interframe code signals representing m successive image frames and wherein m is a variable integer depending upon the particular turn in which the intraframe and interframe code signals are recorded, said method comprising:

• reproducing the intraframe and interframe code signals from each turn;
• selectively coupling the reproduced code signals to an intraframe decoder to decode an intraframe code signal reproduced from a turn and then to an interframe decoder to decode m successive interframe code signals reproduced from said turn, thereby to recover image data from intraframe and interframe code signals reproduced from a turn;
• sensing when an intraframe or interframe code signal is reproduced;
• and controlling the selective coupling of said reproduced code signals as a function of whether intraframe or interframe code signals are sensed as being reproduced.

Apparatus for recording image data in successive tracks on a rotatable medium driven at substantially constant linear velocity, comprising:

• input means for receiving successive image frames of said image data;
• intraframe encoding means for converting a first image frame of image data to an intraframe code signal;
• interframe encoding means for converting (n-1) succeeding image frames of image data to (n-1) interframe code signals, wherein n is the maximum number of image frames recordable in an innermost track of said medium driven at substantially constant linear velocity;
• and recording means for recording an intraframe code signal and at least (n-1) interframe code signals in each track.

Apparatus for reproducing image data from successive turns on a rotatable record medium driven at substantially constant linear velocity, wherein said image data has been recorded as an intraframe code signal representing an image frame followed by (n-1) successive interframe code signals representing (n-1) successive image frames, where n is at least as large as the capacity of image frame signals recordable in an innermost turn, said apparatus comprising:

• playback means for reproducing the intraframe and interframe code signals in each turn;
• intraframe decoder means for recovering image data from the reproduced code signals;
• interframe decoder means for recovering image data from the reproduced code signals;
• sensing means for sensing if an intraframe or interframe code signal is reproduced;
• and coupling means for coupling the reproduced code signals to the intraframe decoder means or to the interframe decoder means as a function of whether said intraframe or interframe code signals are sensed as being reproduced.

Apparatus for recording image data in successive turns on a rotatable medium driven at substantially constant linear velocity, comprising:

• input means for receiving successive image frames of said image data;
• intraframe encoding means for converting a first of said image frames of image data to an intraframe code signal;
• interframe encoding means for converting m succeeding image frames of image data to m interframe code signals, wherein m is a variable integer depending upon the particular turn in which the intraframe and interframe code signals are recorded;
• and recording means for recording the intraframe code signal and m interframe code signals on said medium.

Apparatus for reproducing image data from successive turns on a rotatable record medium driven at substantially constant linear, wherein said image data has been recorded on said medium as an intraframe code signal representing an image frame followed by m successive interframe code signals representing m successive image frames and wherein m is a variable integer depending upon the particular turn in which the intraframe and interframe code signals are recorded, said apparatus comprising:

• playback means for reproducing the intraframe and interframe code signals from each turn;
• intraframe decoder means for decoding an intraframe code signal to recover image data therefrom;
• interframe decoder means for decoding m successive interframe code signals to recover image data therefrom;
• coupling means for selectively coupling the code signals reproduced from a turn to said intraframe decoder means or to said interframe decoder means;
• and control means for controlling the selective coupling of said reproduced code signals as a function of whether intraframe or interframe code signals are reproduced.