Patent ID: 8000197

Claim:
A recording condition adjusting device, comprising: a shaping section for receiving a first digital signal generated from an analog signal representing first information reproduced from an information recording medium and shaping a waveform of the first digital signal to generate a second digital signal; a maximum likelihood decoding section for performing maximum likelihood decoding on the second digital signal to generate a binary signal having maximum likelihood; a calculation section for calculating a first index representing likelihood of a first state transition sequence determined as having maximum likelihood by the maximum likelihood decoding section and a second index representing likelihood of a second state transition sequence determined as having second maximum likelihood by the maximum likelihood decoding section, and calculating a third index obtained based on a difference between the first index and the second index; and an adjusting section for adjusting a power of a recording signal for recording second information on the information recording medium based on a degree of deviation of the third index, wherein: the adjusting section adjusts an edge position of the recording signal based on an average value of the third index; where the degree of deviation is equal to or smaller than a predetermined value and an absolute value of the average value is larger than a predetermined value, the adjusting section adjusts the edge position with priority over the power of the recording signal so as to make the absolute value of the average value equal to or smaller than a predetermined value; and where the absolute value of the average value is equal to or smaller than the predetermined value and the degree of deviation is larger than the predetermined value, the adjusting section adjusts the power with priority over the edge position of the recording signal so as to make the degree of deviation equal to or smaller than the predetermined value.