Interleave mode for helical scan recording
AssigneeThomson Licensing
InventorsRolf Schiffmann, Henrikus Antonius Vaanholt, Rolf Hedtke
Life of this patent
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Abstract
An improved utilization of the storage space on a helical scan recording and/or reproduction apparatus in particular according to the D6 format. In the case of a data transfer rate in which the apparatus recording rate corresponds to an integer multiple of the data transfer rate of data signals to be recorded, the recording is effected in a manner dependent on the ratio of apparatus recording rate to the data transfer rate by a corresponding first portion of the volume of data being written to first data frames (7) and, after corresponding rewinding, by the corresponding second portion of the volume of data subsequently being written to second data frames (8).
Claims14
A method for helical scan recording digital data signals on a magnetic tape medium by means of write/read head groups arranged oppositely on a periphery of a rotating head drum, the method comprising the steps of;
- a) determining a data transfer rate of a first data signal to be recorded;
- b) recording said first data signal sequentially when said data transfer rate of said first data signal substantially corresponds to a recording rate of said apparatus;
- c) recording said first data signal alternatingly with sections of non-useful data signals when said recording rate of said apparatus corresponds to a multiple of said data transfer rate of said first data signal to be recorded;
- and,
- d) overwriting with a second data signal said sections of non-useful data signals when said recording rate of said apparatus corresponds to a multiple of a data transfer rate of said second data signal.
An apparatus for helical scan recording and/or reproduction of digital signals by means of rotary write/read head arrangements comprising:
- a controller for determining recording modes of said apparatus in accordance with a data transfer rate of data coupled for recording;
- where in a first condition, data coupled for recording having data transfer rate in substantial correspondance with an apparatus recording rate, said controller initiates a first recording mode where said data to be recorded is written on a recording medium continuously;
- and,
- where in a second condition said apparatus recording rate corresponds to an integer multiple of a data transfer rate of data coupled for recording, said controller initiates a second recording mode where a first part of said data to be recorded is written in first data frames and a second part of said data to be recorded is recorded in second data frames.
A film editing system receiving and editing digital data scanned from film for helical scan recording and/or reproduction by a recorder, comprising
- a controllable data transfer device;
- and,
- a workstation for controlling said recorder to have at least two recording modes, wherein
- a first recording mode, a data transfer rate of useful data scanned from film for recording corresponds to a recording rate of said recorder, said workstation controls writing of said useful data to a recording medium to occur continuously;
- and,
- in a second recording mode, said recording rate of said recorder corresponds to an integer multiple of a data transfer rate of useful data scanned from film said workstation controls writing of a first part of said useful data to first data frames and subsequently controlls writing of a second portion of said useful data to second data frames.
Dependencies are inferred from the claim text.