Variable length coded data transmission device

Details Variable length coded data transmission device Variable length coded data transmission device

H - Electricity

04

L

H04L 17/02 (2006.01) H03M 7/40 (2006.01) H04N 7/52 (2006.01) H04N 7/56 (2006.01)

Patent

CA 2180189

If a variable length code is caused to have a pseudo fixed length and transmitted in that condition, possible adverse effects due to out-of-synchronization attributable to code errors can be prevented, but it becomes difficult to enjoy this advantage in case an object to be fixed in length includes a block or blocks of variable length codes whose bit length is remarkably long. An object of the present invention is to obviate such a disadvantage as just mentioned. That is, for the transmission of variable length coded data blocks, a threshold arithmetic calculation circuit (9) obtains a threshold from an average of the bit lengths of the variable length coded data blocks for each group of such block., and the judgment circuit (10) makes a judgment as to whether or not those variable length coded data blocks have bit lengths exceeding the threshold of the block group to which such data blocksbelong. Then, a block divider circuit 11 divides the variable length coded data blocks having bit lengths exceeding the threshold into blocks having small bit lengths. Each block thus obtained is fixedly equalized in bit length to an average length level and in that condition.

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