Abstract: A DSP of the DVD recorder includes a balance value setting portion for determining an appropriate value of a focus balance value ? when information is reproduced from an optical disc so as to record the determined focus balance value ?0 in a balance value storing portion and to set the same in a first amplifier of a focus error signal generating circuit, and a correction executing portion for reading the focus balance value ?0 stored in the balance value storing portion when information is recorded in the optical disc 2 so as to correct the read value to be a focus balance value ?1, which is set in the first amplifier of the focus error signal generating circuit.

Abstract: A DSP of a DVD recorder includes: a gain setting portion determining appropriate values of a first gain ? and a second gain ? when playback of an optical disc is performed, recording the first gain ? and the second gain ? thus determined in a gain storing portion, and setting them in a main differential amplifier and a sub differential amplifier, respectively; and a correction performing portion reading, when recording on the optical disc is performed, the first gain ? and the second gain ? stored in the gain storing portion, correcting at least one of them, and setting them in the main differential amplifier and the sub differential amplifier, respectively.

Abstract: A DSP of the DVD recorder includes a balance value setting portion for determining an appropriate value of a focus balance value ? when information is reproduced from an optical disc so as to record the determined focus balance value ?0 in a balance value storing portion and to set the same in a first amplifier of a focus error signal generating circuit, and a correction executing portion for reading the focus balance value ?0 stored in the balance value storing portion when information is recorded in the optical disc 2 so as to correct the read value to be a focus balance value ?1, which is set in the first amplifier of the focus error signal generating circuit.

Abstract: A DSP of a DVD recorder includes: a gain setting portion determining appropriate values of a first gain ? and a second gain ? when playback of an optical disc is performed, recording the first gain ? and the second gain ? thus determined in a gain storing portion, and setting them in a main differential amplifier and a sub differential amplifier, respectively; and a correction performing portion reading, when recording on the optical disc is performed, the first gain ? and the second gain ? stored in the gain storing portion, correcting at least one of them, and setting them in the main differential amplifier and the sub differential amplifier, respectively.