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| Method and apparatus for reducing noise in a video signal |
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| Semiconductor delay line driven by an input signal-derived reference signal |
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| Method of recording and reproducing color video signals |
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| Recording apparatus |
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| Recording/reproducing apparatus and information medium transfer method |
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| Image recording/reproducing apparatus |
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Edit decision list for identifying the pull down phase of a video signal
| Details |
Inventors: Phillips, Michael E.; Cornog, Katherine H.;
Assignee: Avid Technology, Inc. (Tewksbury, MA)
Primary Examiner: Nguyen; Huy
Assistant Examiner:
Attorney, Agent or Firm: Gordon; Peter J.
The invention provides an editing system for editing and combining media material into a resulting media composition. The media may be film or video based material, and also may include audio material. The video may adhere to either NTSC or PAL timing. In response to editing instructions, an Edit Decision List (EDL) is produced that specifies the material that makes up the edited composition, and the order of presentation of this material in the output composition. The EDL specifies the input clips that are taken from the source material using source timecode and similarly defines the output order again according to a new time code, the record time code. The editing system produces an extended EDL that facilitates the downstream processing (after the editing has been completed) for post production tasks requiring the need to know accurately where edit points occur. |
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DETAILED DESCRIPTION A conventional edit decision list (EDL) is a series of computer instructions for an edit controller 20 (FIG.
1) which produces an edited video or film program from a combination of source materials.
The EDL is a list of editing instructions, each of which represents one segment of the program.
Each editing instruction indicates the source of that segment (e.
g.
, the name of the video tape or film on which it is recorded) and the portion of the source, indicated by start and stop times, that makes up the segment.
Edit decision lists are commonly generated using a computerized editing system 15 such as shown in FIG.
1A.
Such a system 15 commonly includes a computer 22 with a volatile, typically random-access, memory 24 connected to a central processing unit (CPU) 26 via a bus 28.
Conventional computer systems, as well as those specially designed for video editing, may be used as the system 15 for the purpose of editing.
More conventional computer systems may also include a printer 32 and non-volatile memory or storage 30, such as a hard disk or optical disk.
The computer system 15 may be connected to an edit controller 20 to provide it with an EDL from which an output video program is generated.
The computer system 15 may also include a video display 34.
FIG.
1B shows in schematic form an object of the present invention.
Source material 50 such as film or videotape is edited on an editing system 15 to produce an extended EDL 55 that describes an edited output composition.
Extended EDL 55 is input to a downstream processor 60 in order to perform post editing processing on the downstream processor 60.
The extended EDL 55 permits communication of metadata from the editing system 15 to the downstream processor 60 to provide for more efficient downstream processing.
FIG.
2 shows a conventional EDL 200 as it could appear on a computer display or as printed.
It should be noted that the particular EDL format used is not important for the invention, which is applicable to edit instructions generally
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TV Signal 
