Patent ID: 7978572

Claim:
A device for reproducing digital signals reproducing a data from a medium recording a modulated data having a correcting block configured by attaching an error correcting code to a user data, the device comprising: a demodulating circuit for performing a demodulating process to a data read from the medium; a memory for storing a data demodulated in the demodulating circuit; a correcting circuit for performing an error correcting process to a data read from the memory; an output circuit for outputting an error-corrected data from the memory to an external point; a memory controlling circuit for controlling a read and a write of a data transferred between the memory and the demodulating circuit, the correcting circuit, and the output circuit; a comparing circuit for comparing a first parameter updated each time a process for one correcting block is done in the demodulating circuit with a second parameter updated each time a process for one correcting block is done in the correcting circuit; and a clock controlling circuit for switching a frequency of a clock supplied to the demodulating circuit, the correcting circuit, the output circuit, and the memory controlling circuit depending on a comparison result in the comparing circuit.