Patent ID: 8165459

Claim:
A reproducing apparatus to reproduce reproduction data at a speed different from a speed at a time of recording of the reproduction data, the recording apparatus comprising: a storage section to store the reproduction data; a primary reproducing plan producing section to produce a primary reproducing plan ranging from present time to future, according to the reproduction speed different from the speed at the time of recording the reproduction data; and a secondary reproducing plan producing section to modify to the primary reproducing plan by solving an optimization problem based on the primary reproducing plan produced by the primary reproducing plan producing section, so as to produce a secondary reproducing plan ranging from the present time to the future; wherein the reproduction data stored in the storage section includes at least sound data, the apparatus further comprising: a judgment section to judge whether the difference between the primary reproducing plan produced by the primary reproducing plan producing section and the secondary reproducing plan produced by the secondary reproducing plan producing section is within a previously set range or not; and a sound volume adjusting section to reduce a sound volume of a sound based on the reproduction data output from the output apparatus to a previously set sound volume when the judgment section judges that the difference between the primary reproducing plan produced by the primary reproducing plan producing section and the secondary reproducing plan produced by the secondary reproducing plan producing section is not within the previously set range, or when the secondary reproducing plan producing section has not produced the secondary reproducing plan satisfying the constraint condition.