Recording/reproduction apparatus which adjusts recording power based on a partial response maximum likelihood (PRML) technique
View Patent ↗A recording/reproduction apparatus, comprising a first recording section for recording test information onto a medium using at least one recording power, a reproduction section for reproducing at least one test signal indicating the test information from the medium, and a second recording section for recording information onto the medium using one of the at least one recording power. The reproduction section comprises a decoding section for performing maximum likelihood decoding of the at least one test signal and generating at least one binary signal indicating a result of the maximum likelihood decoding, a calculation section for calculating a reliability of the result of the maximum likelihood decoding based on the at least one test signal and the at least one binary signal, and an adjustment section for adjusting a recording power for recording the information onto the medium to the one recording power based on the reliability.
1. A recording/reproduction apparatus, comprising:
a first recording section for recording at least one piece of test information onto a medium using at least one recording power;
a reproduction section for reproducing at least one test signal indicating the at least one piece of test information from the medium; and
a second recording section for recording information onto the medium using one of the at least one recording power,
wherein the reproduction section comprises:
a decoding section for performing maximum likelihood decoding of the at least one test signal and generating at least one binary signal indicating a result of the maximum likelihood decoding;
a calculation section comprising:
a differential metric detection section for calculating a reliability of the result of the maximum likelihood decoding based on a state transition sequence identified by the at least one binary signal and a result of calculation of a Euclid distance between the at least one test signal and at least one target value used in the maximum likelihood decoding;
a determination section for determining whether or not a recorded state is normal based on the reliability calculated by the differential metric detection section; and
an adjustment section for adjusting a recording power for recording the information onto the medium to the one recording power based on the reliability calculated by the differential metric detection section.
2. A recording/reproduction method, comprising:
recording at least one piece of test information onto a medium using at least one recording power;
reproducing at least one test signal inddicating the at least one piece of test information from the medium; and
recording information onto the medium using one of the at least one recording power,
wherein the reproducing step comprises;
performing maximum likelihood decoding of the at least one test signal and generating at least one binary signal indicating a result of the maximum likelihood decoding;
calculating a reliability of the result of the maximum likelihood decoding based on a state transition sequence identified by the at least one binary signal and a result of calculation of a Euclid distance between the at least one test signal and at least one target value used in the maximum likelihood decoding; and
adjusting a recording power for recording the information onto the medium to the one recording power based on the reliability.