Data regenerating apparatus

A data regenerating apparatus that generates decoded data by performing a decoding process on a readout signal from a storage medium according to an iterative decoding technique corresponding to a turbo coding technique, and regenerates recorded data by performing a predetermined error correction process on said decoded data, said data regenerating apparatus comprising:

• error state detection means for detecting an error state of said decoded data;
• first determination means for determining whether or not the error state of the decoded data detected by said error state detection means is correctable using said predetermined error correction process;
• and,
• decoding control means for stopping said decoding process when it is determined by said first determination means that the error state of said decoded data is correctable using said predetermined error correction process.

A data regenerating apparatus that generates decoded data by performing a decoding process on a readout signal from a storage medium according to an iterative decoding technique corresponding to a turbo coding technique, and regenerates recorded data based on said decoded data, said data regenerating apparatus comprising:

• an iteration number controller configured to control the number of iterations of said decoding process based on a distribution state of likelihood information obtained during said decoding process according to the iterative decoding technique;
• wherein said iteration number controller further comprises:
• a determination unit configured to determine whether or not the distribution state of said likelihood information has higher reliability in a hard decision result of the likelihood information compared to that of a predetermined standard state;
• and,
• a decoding controller configured to stop said decoding process when it is determined by said determination unit that the distribution state of said likelihood information has higher reliability in the hard decision result of the likelihood information compared to that of the predetermined standard state.

A data regenerating apparatus that generates decoded data by performing a decoding process on a readout signal from a storage medium according to an iterative decoding technique corresponding to a turbo coding technique, and regenerates recorded data based on said decoded data, said data regenerating apparatus comprising:

• a quality information detector configured to detect quality information indicating the quality of the readout signal;
• and
• an iteration number controller configured to control the number of iterations of said decoding process based on the quality information detected by said quality information detector;
• wherein:
• said quality information detector further comprises a histogram generating unit configured to generate a histogram of sample values that are produced by sampling the readout signal in a predetermined cycle and are rendered to said decoding process;
• and,
• a quality information computing unit for computing information indicating the distribution state of the sample values represented in the histogram generated by said histogram generating unit as the quality information of the readout signal;
• and,
• said iteration number controller further comprises a first iteration number determination unit configured to determine the number of iterations of said decoding process based on said information indicating the distribution state of the sample values obtained in said quality information computing unit;
• and,
• performs said decoding process for the number of times determined by said first iteration number determination unit.

A data regenerating apparatus that generates decoded data by performing a decoding process on a readout signal from a storage medium according to an iterative decoding technique corresponding to a turbo coding technique, and regenerates recorded data based on said decoded data, said data regenerating apparatus comprising:

• a quality information detector configured to detect quality information indicating the quality of the readout signal;
• an iteration number controller configured to control the number of iterations of said decoding process based on the quality information detected by said quality information detector;
• wherein:
• said quality information detector detects information indicating the amplitude of a noise component included in a readout signal with a predetermined pattern prerecorded on the storage medium as quality information of the readout signal of the recorded data;
• and,
• said iteration number controller comprises a second iteration number determination unit configured to determine the number of iterations of said decoding process based on said information indicating the amplitude of the noise component included in the readout signal of the predetermined pattern obtained in said quality information detector;
• and,
• performs said decoding process for the number of times determined by said second iteration number determination unit.