Patent ID: 6914737
Filing Date: 2005-07-05
Classification: G11B,H03M

Abstract:
1. An apparatus for recording and regenerating data, said apparatus comprising: a recording part converting a first data to be regenerated into a second data in accordance with a predetermined operation and recording the second data; a first decoding part calculating a branch metric and a pass metric as a first calculation result for a sample data by sampling a regenerative signal from the second data and decoding the second data based on the first calculation result; a first likelihood converting part converting the first calculation result into a first likelihood of the first calculation result, said first likelihood corresponding to the first data; a second decoding part generating a synthesized sample value for the first data by a synthesizing process based on the first likelihood, calculating the branch metric and the pass metric as a second calculation result based on the first likelihood, and decoding the second data based on the second calculation result; and a second likelihood converting part converting the second calculation result into a second likelihood of the second calculation result, said second likelihood corresponding to the second data, wherein said first decoding part calculates the pass metric based on the second likelihood converted by said second likelihood converting part, and one of the first data decoded by the second decoding part and the second data decoded by the first decoding part is output as a regenerated data.