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Method and apparatus directed to processing trick play video data to compensate for intentionally omitted data
| Details |
Inventors: Lane, Frank A.; Boyce, Jill M.; Fuhrer, Jack S.; Henderson, John G. N.; Plotnick, Michael A.;
Assignee: Hitachi America, Ltd. (Tarrytown, NY)
Primary Examiner: Psitos; Aristotelis
Assistant Examiner: Cullen; Larry
Attorney, Agent or Firm: Michaelson & Wallace, Straub, Esq.; Michael P.
Digital video tape recorder apparatus that generates commands to instruct a television receiver to perform special processing, e.g., processing designed to enhance image quality, on video data received from the digital video tape recorder during trick play operation is disclosed. The commands from the video tape recorder inform the television receiver that the video tape recorder is operating in trick play mode and that video processing not performed on normal play video data output by the video tape recorder during normal play operation should be performed on the trick play video data which is output during trick play operation. The video data output during trick play operation is a subset of the normal play video data. The video processing commands output during trick play operation instruct a receiver to perform video processing intended to compensate for normal play data intentionally omitted by the video tape recorder from the trick play video data because of, e.g., data limitations resulting from the limited amount of data that can be accurately read from a tape during trick play operation. Method of generating the video processing commands which are output to a receiver during trick play video tape recorder operation are also disclosed. |
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DETAILED DESCRIPTION The present invention provides a digital video recorder compatible receiver.
In a representative embodiment, the receiver comprises a digital video tape recorder ("VTR") port and a video decoder including an error concealment circuit.
The video decoder receives video data which it decodes and outputs to a display device such as a cathode ray tube or liquid crystal display device.
The digital VTR port is adapted for coupling the receiver to a VTR command and data output of a video tape recorder.
The digital VTR port receives from the VTR video data and VTR commands.
The VTR commands may indicate, e.
g.
, that the VTR is operating in trick play mode or that particular trick play error concealment operations are to be performed.
The video data can comprise, for example, digital video/audio data packets.
The VTR commands can be received by the receiver via a separate command line coupled to the digital VTR port or as part of the video/audio data packet stream.
Alternatively, the error concealment circuit may detect that the VTR is operating in trick play mode by monitoring the received video data and, e.
g.
, detecting that data for fewer inter-coded frames are being received than would be the case during normal VTR playback operation.
The video decoder including the error concealment circuit is coupled to the digital VTR port.
On receiving a VTR command that indicates that the VTR is operating in trick play mode or upon determining from the received data that the VTR is operating in trick play mode, the error concealment circuit disables normal play error concealment performed on the video data and enables trick play error concealment.
While there may be a number of error concealment operations that are the same for both normal play error concealment and trick play error concealment, trick play error concealment includes additional error concealment operations which are not performed during normal playback operation.
Thus, trick play error concealment includes error concealment operations which are specifically directed to the concealment of errors resulting from trick play VTR operation such as fast forward or reverse playback operation
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Television 
