| 摘要 |
PURPOSE:To obtain a recording and reproducing device of binary data that has optimum error-correcting function with shortest interleave by obtaining the interleave constitution of shortest interleave length by means of analytic method using a state-transition probability. CONSTITUTION:By using the state transition probability which is an output from a state transition probability calculating circuit with synthetic Gilbert model 1 inputted to itself, a frame error calculating circuit 2 obtains an Erdm at the time when symbol errors are at complete random. By using the same input, a circuit 3 obtains the occurrence-probability of a frame that includes one symbol error (Eint). In an interleaving efficiency calculating circuit 4, the interleave efficiency eta which is the value of Eint/Erdm is calculated. By using the interleave efficiency eta as an input, an optimum interleave length calculating circuit 5 calculates the smallest value of an interleave distance lopt that makes the eta come to be a prescribed value etamax, and outputs this lopt to an address generating circuit 6. As a result, the interleave can be applied with the shortest interleave length to obtain an optimum error correcting capability. Therefore, a recording and reproducing device excellent in cost-performance can be attained.
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