| 摘要 |
A playback data detecting apparatus comprises a transversal filter 11 for performing partial response equalization, a Viterbi decoding circuit 12 for subjecting the output of the transversal filter 11 to Viterbi decoding, a selected code determination circuit 13 for selecting either (the) (delayed) data of the output of the transversal filter 11 or the output of the Viterbi decoding circuit 12 to determine (the an output corresponding equalization function), a reducing code determination circuit 14 for determining (an output code) by subtracting by the output of the Viterbi decoding circuit 12 (from) (the delayed) data of the output of the transversal filter 11, a (clocked) delaying circuit 15 for delaying the output of the selected code determination circuit 13 and the output of the reducing code determination circuit 14, respectively, and a multiplying coefficient calculating circuit 16 which calculates the optimal multiplying coefficients of the transversal filter 11 for minimizing bit errors from the output of the (clocked) delaying circuit 15 and outputs the calculated result to the transversal filter 11. As a result, it is possible to reduce the bit error rate of playback signal recorded in digital disk recorders, disk VTRs etc. to playback and detect optimal data.
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