Patent ID: 6891689

Claim:
An apparatus for reading recorded data, from a recording medium having an address part for recording an address and a data part for recording data in that the data part has a higher recording density than the address part, said apparatus comprising: a first clock signal generating part generating a first clock signal; a second clock signal generating part generating a second clock signal faster than the first clock signal; a third clock signal generating part generating a third clock signal; a fourth clock signal generating part generating a fourth clock signal faster than the third clock signal; a sampling part sampling a read signal from recorded data of a recording medium by synchronizing with the first clock signal when the recorded data is the address recorded in the address part and by synchronizing with the third clock signal when the recorded data is the data in the data part; a first storing part consecutively storing a sample value obtained by said sampling part; and a data detecting part retrieving the sample value from said first storing part by synchronizing the second clock signal when the sample value is sampled from the address recorded in the address part and by synchronizing the fourth clock signal when the sample value is sampled from the data recorded in the data part, and detecting data by processing the sample value in accordance with a predetermined algorithm, so that the recorded data is read based on the data detected by said data detecting part.