Patent ID: 6470142
Filing Date: 2002-10-22
Classification: H04N

Abstract:
A digital data reproducing apparatus for reproducing data blocks from a record medium, the data blocks having at least two data lengths, the data blocks each having a synchronous pattern for detecting synchronization, comprising:synchronous pattern detecting means for detecting a synchronous pattern of the synchronous signal from the reproduced data; first memory means for successively storing the reproduced data as data blocks with a predetermined data length and outputting stored data as data blocks with the predetermined data length in the order of order data blocks, said first memory means having a first data length; first comparing means for determining whether or not both data that is input to said first memory means and data that is output therefrom match the synchronous pattern corresponding to the detected result of said synchronous pattern detecting means; second memory means for inputting the reproduced data that is the same as the reproduced data that is input to said first memory means, storing the reproduced data as data blocks with the predetermined data length, and outputting stored data as data blocks with the predetermined data length in the order of older data blocks, said second memory means having a second data length K, the second data length K being smaller than the first data length L, the second data length K not being any integer times the first data length L; second comparing means for determining whether both data that is input to said second memory means and data that is output therefrom match the synchronous pattern corresponding to the detected result of said synchronous pattern detecting means; and output means for outputting the reproduced data as data blocks with a data length corresponding to said first comparing means or said second comparing means that has detected a match of the synchronous pattern.