| 摘要 |
The present invention relates to an optical recording apparatus that provides improved writing speed. In the processing means (50) an encoded data signal (NRZ) is processed, and a first clock generator (52) generates a two-level clock signal (CLK). Furthermore, a duty cycle modulator (MOD) modulates the clock signal (CLK) in response to the encoded data signal (NRZ) so as to vary the duty cycle of the clock signal (CLK), possibly with a plurality of phases. The resulting single, combined data and clock signal (NRZ_CLK) is transmitted to the optical pick-up unit (OPU; 20) where a second clock generator (24) extracts a retrieved clock signal (CLKr) from the combined signal (NRZ _CLK), and a data demodulator (DEMOD; 23) extracts the encoded data signal (NRZ) using said retrieved clock signal (CLKr). Thereby, a fast and reliable bandwidth is obtained in the communication between the processing means and the optical pick-up (OPU; 20.
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