05887115 is referenced by 13 patents and cites 82 patents.

Methods and apparatus for converting digital signals having a variable data rate to fixed data rate signals suitable for recording on a tape by a digital video tape recorder are disclosed. The methods include buffering of the received variable rate data, measuring the data rate of the received data for a fixed period of time and processing the buffered data to converted it into a fixed rate data stream. This processes is repeated for each of the fixed periods of time. Methods for increasing the recording time of a digital video tape recorder ("VTR") and for supporting multiple normal play modes of digital VTR operation, e.g., recording modes for recording SDTV and HDTV are also disclosed. To generate fixed data rate signals from variable data rate signals one or more of data padding and/or data reduction techniques are used. The same data reduction techniques used to generate the fixed rate data stream are used, in accordance with various embodiment of the invention, to reduce the amount of data required to represent a video frame.

Title
Method and apparatus for implementing a video tape recorder for recording digital video signals having either a fixed or variable data transmission rate
Application Number
184716
Publication Number
5887115
Application Date
November 16, 1994
Publication Date
March 23, 1999
Inventor
Joseph E Augenbruan
Princeton
NJ, US
Frank Anton Lane
Medford Lakes
NJ, US
Jill MacDonald Boyce
Manalapan
NJ, US
Agent
Peter L Michaelson & Wallace Michaelson
Michael P Straub
Assignee
Hitachi America
NY, US
IPC
H04N 5/917
H04N 5/91
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