Patent ID: 7224885

Claim:
A data recorder apparatus for recording in a recording medium navigation data, facilitating a trick, playback mode of operation, and information data contained in each data unit of a sequence of data units forming an input data signal, comprising: a buffer memory responsive to said input data signal for storing the information data of a running plurality of said data units and for reading out the stored information data of said running plurality of data units, sequentially, such that the information data of a data unit next-in-line to be recorded are developed at an output of said buffer memory; means responsive to said input data signal for producing a value conforming to a position of a first address pointer of a plurality of address pointers of the navigation data of said next-in-line data unit, when the information data of a data unit associated with said first address pointer position and referred to by said first address pointer value are present concurrently with the information data of said next-in-line data unit in said buffer memory, said conforming value identifying where in said recording medium the data information of said associated data unit are designated to be recorded, the production of a value conforming to a position of a second address pointer of said plurality of address pointers of said next-in-line data unit being avoided, when the data information of a data unit associated with said second address pointer position are not present concurrently with the information data of said next-in-line data unit in said buffer memory; and means for recording the information data and said navigation data of said given next-in-line data unit in said recording medium.