Device and method for reproducing digital signal and device...

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel

Reexamination Certificate

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C369S047280, C369S053340, C369S059190

Reexamination Certificate

active

07978572

ABSTRACT:
A technique capable of realizing a power saving in a device for reproducing/recording digital signals by properly controlling a frequency of a clock. The device for reproducing/recording digital signals (device for reproducing an optical disk) includes: a difference comparing circuit for comparing a first parameter (demodulating block counter) updated each time a process for one correcting block is done in a demodulating circuit with a second parameter (error correcting block counter) updated each time a process of one correcting block is done in an error correcting circuit; and a circuit (clock controlling circuit etc.) for switching a frequency of a master clock (MCLK) depending on a comparison result of the difference comparing circuit. Thereby, the frequency of the clock can be switched both of when the demodulation for one correcting block is ended and when the correcting process for one correcting block is ended by using the switched master clock.

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Pan, Jyh-Shin et al., “Fully Integrated CMOS SoC for 56/18/16 CD/DVD-dual/RAM Applications with On-Chip 4-LVDS Channel WSG and 1.5Gb/s SATA PHY,” ISSC 2006 Digest of Technical Papers, pp. 266-267, 653.

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