Editing system for controlling the transfer of selected video information from a video source to a video tape recorder Patent #: 4040098
ApplicationNo. 05/765902 filed on 02/07/1977
US Classes:386/59Counting control pulse
ExaminersPrimary: Shaw, Gareth D.
Assistant: Heckler, Thomas M.
Attorney, Agent or Firm
International ClassesG11B 27/02 (20060101)
G11B 27/022 (20060101)
G11B 27/028 (20060101)
G11B 15/00 (20060101)
G11B 27/34 (20060101)
G11B 27/024 (20060101)
AbstractA computer is provided for use with a video tape editing system. The video tape editing system is of the type which performs tape-to-tape editing by transferring selected video information from a first video tape recorder, designated the "playback" video tape recorder, to a second video tape recorder, designated the "record" video tape recorder; or directly from a video camera to a record video tape recorder. The computer of the invention, when used in conjunction with such a video tape editing system, provides precise end insert timing so that both in-and-out editing can be automatically performed. Precision accuracy in the system is maintained without the use of a time code, this being achieved by means of a unique closed loop circuit which counts control track pulses derived from the conventional video cassette tapes which are normally used in present-day video tape recorders. The computer of the invention enables in-and-out edit points to be previewed as many times as desired by the operator. After each preview, the operator can adjust all the parameters of the edit. The computer includes a digital stop watch feature which provides frame-accurate scene duration timing for either the playback or record video tape recorders in the video editing system. Moreover, scenes can be timed from still frame start to still frame stop, or on the fly, if so desired. The computer also provides for an automatic bi-directional tape search in either the playback or record video tape recorders in the video tape editing system.