Video frame storage recording and reproducing apparatus

• US 4,270,150 A
• Filed: 01/28/1977
• Issued: 05/26/1981
• Est. Priority Date: 01/28/1977
• Status: Expired due to Term

• Current Assignee: Ampex Corporation (Delta Information Systems, Inc.)
• Original Assignee: Ampex Corporation (Delta Information Systems, Inc.)
• Inventors: Diermann, Joachim P., Ritchey, Thomas W. Jr.
• Primary Examiner(s): Cardillo, Jr., Raymond F.
• Application Number:
  US05/763,371
• Time in Patent Office: 1,579 Days
• Field of Search: 360/8-10, 360/14, 360/22-23, 360/26, 360/32-33, 360/35, 360/36, 360/63-64, 360/69, 360/72, 360/75, 360/78, 360/98, 358/4, 358/8
• US Class Current: 386/202
• CPC Class Codes: G11B 17/005 Programmed access to indexed parts of tracks of operating discs, by guiding the disc
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 9/808 involving pulse code modulation of the composite colour video-signal

Abstract

Apparatus is disclosed for recording video information signals on magnetic media by sampling the information signal and converting the samples to a plurality of component digital data streams which are simultaneously recorded on separate surfaces of a disc pack associated with a generally standard computer disc drive and for thereafter reproducing the plurality of digital data streams and recombining the same in a manner whereby the analog video information signal is reconstructed.

Claims

1. Apparatus for simultaneously recording on magnetic media a plurality of digital component signals, which comprise the digital component signals of an analog information signal, and for later simultaneously reproducing said component signals therefrom, said apparatus being adapted for use in a television studio which has a station reference video information signal source comprising:

disc drive means for holding and rotatably driving a removable disc means at a constant predetermined rotational speed;

said disc drive means including carriage means carrying a plurality of transducing means for recording on and reproducing from one of two sets of recording surfaces, each set having a plurality of said surfaces, a transducing means being provided for each of said surfaces;

disc means removably mounted upon said disc drive means and having a plurality of substantially flat, circular discs having said two sets of magnetically recordable surfaces, there being a transducing means associated with each of said surfaces;

signal processing means including channel processing means for each digital component signal for applying each of said plurality of digital component signals to one of said transducing means associated with each of two sets of recording surfaces whereby each of said plurality of digital component signals is simultaneously recorded on one set of said surfaces, and for simultaneously reproducing said digital component signals from said set of separate surfaces and aligning the component signals so that they can be combined to reconstruct the information signal, said signal processing means including means for synchronizing all of said channel processing means to said information signal during recording and to said separate reference video information signal during reproducing; and

,

control means for controlling the operation of said disc drive means and said signal processing means, said control means including at least one operator control panel having a plurality of control keys thereon for controlling the selective recording and reproducing by said apparatus.

2. Apparatus as defined in claim 1 wherein said signal processing means includes means for combining said digital component signals to reconstruct the information signal.

3. Apparatus as defined in claim 2 including analog-to-digital converting means for converting an analog information signal into said plurality of digital component signals.

4. Apparatus as defined in claim 3 wherein said signal processing means includes means for converting said combined digital component signals to an analog information signal.

5. Apparatus as defined in claim 1 wherein said information signal is a video television signal, said transducing means recording substantially one full television field of video information on one set of said surfaces during one revolution of said disc means.

6. Apparatus as defined in claim 5 wherein said disc drive means rotates said disc means at about 3600 revolutions per minute.

7. Apparatus as defined in claim 6 wherein each of said transducing means is carried by said carriage means in a manner whereby all of said transducing means are at substantially equal radius from the center of said disc means, said disc drive means controlling said carriage means in response to the control by said control means to move said plurality of transducing means to different radii for the selective recording and reproducing of television video information.

8. Apparatus as defined in claim 7 wherein each set of surfaces of said disc means includes at least eight surfaces upon which said digital component signals are recorded.

9. Apparatus as defined in claim 8 wherein said signal processing means includes switching means for switching between one set of transducing means for recording one field of television video information on one of said sets of eight disc surfaces during one revolution and another set of eight transducing means for recording a second field of television video information on said other set of surfaces, both sets of surfaces being recordable with said carraige means being at the constant radii, so that a full frame of television video information can be recorded in two revolutions of said disc means.

10. Apparatus as defined in claim 5 wherein said signal processing means includes means for generating a clock signal that is synchronized to said separate reference video information signal, and each of said channel processing means includes means for independently time base correcting each of said digital component signals during reproducing to thereby align the component signals for combining the same to reconstruct the video information signal, each of said time base correcting means being controlled by said clock signal.

11. Apparatus as defined in claim 1 wherein said disc means includes a surface in addition to said two sets of surfaces upon which address and status information is recorded on and reproduced from, said address and status information being related to the plurality of component signals that are recorded on said two sets of said disc surfaces, transducing means carried by said carriage means for recording said address and status information on and reproducing the same from said additional surface and means for generating said address and status information and applying the same to said transducing means.

12. Apparatus for recording and reproducing digital component siganls of a video information signal on magnetic media, comprising:

substantially circular disc means having two sets of substantially flat disc surfaces upon which magnetic recording and reproducing can be performed, each set having a plurality of said surfaces, said disc means including one set of disc surfaces upon which said digital component signals for one field of television video information are simultaneously recorded on or subsequently simultaneously reproduced from during one revolution of said disc means and another set of surfaces upon which said digital component signals for a second field of television video information are simultaneously recorded on or subsequently simultaneously reproduced from, said first and second fields comprising a frame of television video information, said frame being recorded or reproduced when said carriage means is at a single discrete radial location;

drive means for rotating one of said disc means mounted thereon at a predetermined substantially constant rotational speed;

transducing means for magnetically recording and reproducing signals on and from, respectively, said surfaces, each of said surfaces having a transducing means associated therewith;

carriage means for moving said transducing means radially relative to said disc surfaces, said carriage means carrying said transducing means so that movement thereof in response to a control means moves all of said transducing means relative to said disc surfaces;

signal processing means connected to said transducing means for simultaneously recording on at least two surfaces of one of said sets of surfaces said digital component signals and for simultaneously reproducing said digital component signals and for combining the same to derive said information signals, said signal processing means including switching means for switching from said one set of transducing means associated with said one set of surfaces for recording or reproducing said one field to another set of transducing means associated with said other set of surfaces for recording or reproducing said second field during successive revolutions of said disc means; and

,

control means for controlling the operation of said drive means, said carriage means and said signal processing means, said control means including at least one operator control panel having a plurality of numerical and function keys thereon for controlling the movement of said carriage means for moving said transducing means radially to the proper discrete location and for controlling selective recording and reproducing of a frame of video information thereon.

13. Apparatus as defined in claim 12 wherein said disc means includes a surface in addition to said two sets of surfaces on which address and status information can be recorded on and reproduced from, said address and status information being related to the plurality of component signals that are recorded on said two sets of disc surfaces, transducing means carried by said carriage means for recording said address and status information on and reproducing the same from said additional surface and means for generating said address and status information and applying the same to said transducing means.

14. Apparatus as defined in claim 12 wherein the information signals comprise analog information signals, said signal processing means including means for converting an analog video information signal to said digital component signals.

15. Apparatus as defined in claim 12 wherein each of said introducing means is mounted to said carriage means so that substantially all of said transducing means are aligned to be at a substantially similar radius relative to the center of said disc means, said control means controlling said carriage means whereby radial movement of said carriage means effectively positions all of said transducing means on said surfaces at the same radial distance from the center of said disc means.

16. Apparatus as defined in claim 12 wherein said control means includes means for synchronizing said drive means to the vertical synchronization pulse of said video information signal and rotating said disc means at a rotational speed corresponding to the rate at which said vertical synchronization pulses occur.

17. Apparatus as defined in claim 12 wherein each set of surfaces comprises eight disc surfaces, said signal processing means including analog-to-digital converting means for converting to eight digital component signals to said video information signal from an analog video information signal.

18. Apparatus as defined in claim 17 wherein said signal processing means includes means for generating a clock signal and for synchronizing the same to an available external video reference signal, and separate means associated with each of said digital component signals for time base correcting each of said digital component signals during reproducing to thereby precisely align the component signals so that they can be properly combined to derive said video information signal, each of said time base correcting means being controlled by said clock signal that is synchronized with said external video reference signal.

19. Apparatus as defined in claim 18 wherein said signal processing means includes digital-to-analog converting means for converting said digital component signals to said analog information signal.

20. Apparatus for recording and reproducing video information having sufficient content for producing a still image, comprising:

disc drive means for receiving and rotating a removable disc means at a substantially constant rotational velocity, and having at least first and second sets of transducer means, each set having a plurality of transducer means, all of said transducer means being mounted upon a common movable carriage means;

said disc means having a plurality of substantially circular flat spaced apart discs with magnetically recordable surfaces, said surfaces being located adjacent said transducer means to thereby comprise first and second sets of said surfaces, one set of disc surfaces being adapted for simultaneous recording or subsequent simultaneous reproducing of digital component signals of one field of television video information during one revolution of said disc means and the second set of surfaces being adapted for simultaneous recording or subsequent simultaneous reproducing of digital component signals for a second field of television video information during the next revolution of said disc means;

means for moving said carriage means to change the position of said transducing means relative to said surfaces to different radial locations relative to the center of said disc means;

signal processing means including means for converting an analog video information signal to a plurality of digital component signals and selectively applying the same to said first or second set of said transducing means for simultaneously recording each of said digital component signals on a separate surface, means for subsequently simultaneously reproducing said digital component signals and means for combining the same to reconstruct said analog video information signal, said signal processing means further including switching means for switching from one of said sets of transducing means for recording or reproducing one field to the other of said sets of transducing means for recording or reproducing a second field during a successive revolution of said disc means, when said carriage means is at a single radial location; and

,

control means for controlling said disc drive means, said means for moving said carriage means and said signal processing means, said control means including at least one control panel having a plurality of control switches for controlling the selective recording or reproducing by said apparatus.

21. Apparatus as defined in claim 20 wherein said control means includes means for synchronizing said drive means to the vertical synchronization pulse of said television video signal and for driving said rotatable disc means at a rotational speed corresponding to the rate at which said vertical synchronization pulses occur.

22. Apparatus as defined in claim 20 wherein each set of surfaces comprises eight disc surfaces, said signal processing means includes analog-to-digital converting means for converting said analog video information signal into eight digital component signals.

23. Apparatus as defined in claim 20 wherein said disc means includes, in addition to said first and second sets of disc surfaces, at least one disc surface upon which address and status information concerning the fields of television information that are recorded or reproduced from said disc means can be recorded on and reproduced from, said disc drive means including a transducer means for said one disc surface and said apparatus includes means for generating said address and status information and applying the same to said transducing means.

24. Apparatus for selectively recording and reproducing color video information signals on magnetic media, said apparatus being adapted for use in a television system of the type which has a separate reference video signal source, comprising:

disc drive means for holding and rotatably driving a removable disc means at a substantially constant predetermined rotational speed, said disc drive means including carriage means carrying two sets of transducing means for recording on and reproducing from recording surfaces, each of said two sets of transducing means having a plurality of transducing means, there being a recording surface for each of said transducing means;

disc means removably mounted upon said disc drive means and having a plurality of substantially flat circular discs, with the discs having at least two sets of said magnetic recording surfaces;

signal processing means, including analog-to-digital converting means for converting an analog video information signal into a plurality of digital component signals;

said signal processing means including separate channel processing means for each digital component signal for applying each of said plurality of digital component signals to one of said transducing means whereby each of said plurality of digital component signals are simultaneously recorded on one set of said surfaces and for subsequently simultaneously reproducing said digital component signals from said set of separate surfaces and for aligning the component signals so that they can be combined to reconstruct the information signal, said signal processing means further including means for synchronizing said channel processing means to said information signal during recording and to said separate reference video signal during reproducing, and means for generating a clock signal that is synchronized to said separate reference video signal;

each of said channel processing means including means for independently time base correcting each of said digital component signals during reproducing to thereby align the component signals for combining the same to reconstruct the video information signal, each of said time base correcting means being controlled by said clock signal that is synchronized with said separate reference signal;

said signal processing means including digital-to-analog converting means for combining said digital component signals to reconstruct the analog information signal during reproducing;

said signal processing means including switching means for switching from said one set of transducing means associated with one set of surfaces for recording or reproducing one video field to said second set of transducing means associated with the other set of surfaces for recording or reproducing a second field during a successive revolution of said disc means; and

,

control means for controlling said disc drive means and said signal processing means, said control means including at least one control panel having a plurality of control switches for controlling the selective recording or reproducing by said apparatus.

25. Apparatus as defined in claim 24 including carriage means upon which said transducing means are mounted whereby substantially all of said transducing means are aligned so that all of said transducing means are at the same distance relative to the center of said disc pack means during operation, said carriage means being radially movable relative to said center in response to said control means for positioning said transducing means at different locations on said surfaces to thereby record or reproduce separate fields of video information at various locations thereon.