| 摘要 |
Input data is converted into digital data in a A/D converter in synchronization with a regenerated clock, a zero-cross detecting signal of the digital data is detected in a zero-cross detector, a phase shift quantity is detected in a phase detector according to two pieces of digital data obtained before and after the detection of the zero-cross detecting signal, an average of phase shift quantities is calculated as target oscillation frequency data in a frequency calculating unit, the target oscillation frequency data is converted into analog data in a D/A converting unit, and the regenerated clock is generated in a voltage control oscillator according to the analog data and is provided for the A/D converter. Thereafter, the digital data is decoded to regenerated data in a Viterbi decoder in synchronization with the regenerated clock. Accordingly, because the constituent elements between the A/D converter and the D/A converter can be made of digital circuits, the information regenerating apparatus does not receive an adverse influence in which characteristics of analog circuits lack uniformity, and the information regenerating apparatus, which is operated at a uniform characteristic and has a high performance, can be obtained.
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