Abstract: A recording information reproducing apparatus which can reduce a residual phase error in a read signal caused due to an influence by a time base fluctuation. A read signal read out from a recording medium is sampled at a timing according to a clock signal, thereby obtaining a read sampling value sequence. An oscillation signal whose phase is synchronized with the read sampling value sequence is formed as a clock signal. A sampling value sequence which is obtained at a time point when the phase in the read sampling value sequence is deviated by an amount corresponding to a phase error occurring in the read sampling value sequence is obtained as a corrected read sampling value sequence. By performing a decoding process to the correction read sampling value sequence, information data is obtained.

Abstract: A reproducing and recording apparatus, a decoding apparatus, a recording apparatus, a reproducing and recording method, a decoding method and a recording method are provided in which a computation for changing acoustic characteristics of compressed digital data is effected on a scale factor of each divided band in the compressed digital data including spectrum data band-divided into a plurality of bands on a frequency axis and the scale factor of every divided band.

Abstract: The present invention has an object to stably reproduce wobble signals of all disks of CD-R/RW, DVD-R/RW and DVD-RAM by one wobble signal reproducing circuit. In the wobble signal reproducing circuit, an AGC (AUTOMATIC GAIN CONTROL) circuit for equating a push-pull circuit output of a wide range and an RF amplitude of an optical detector output of two systems obtained by push-pull, and an AGC (AUTOMATIC GAIN CONTROL) circuit for making a wobble amplitude uniform are provided with a function to hold a gain or to change over a response time constant, and at the time of reproduction of the DVD-R/RW, a land pre-pit region is detected by the push-pull output to hold AGC (AUTOMATIC GAIN CONTROL) or change over a response time constant. Besides, in an address information recording region (PID region) at the time of reproduction of the DVD-RAM, the AGC (AUTOMATIC GAIN CONTROL) is held or the response time constant is changed over.