Phase locked loop for controlling recordable optical disk drive

Abstract

The invention provides a phase locked loop (PLL) for producing oscillation signal, wherein the oscillation signal can sustain stabilized phase difference relative to the reference signal. The phase locked loop includes a first frequency divider, a phase shift detection circuit and a phase-adjusting circuit.

Description

technical field [0001] The present invention relates to a phase locked loop (PLL), in particular to a recordable optical disk drive using the phase locked loop. When recording data to a recordable optical disk, a phase shift detection operation is performed. Background technique [0002] A phase-locked loop is used for frequency control. see figure 1 , figure 1 It is a block diagram of a known phase-locked loop 10 for controlling a recordable optical disc player. The PLL 10 responds to the wobble signal (WOBBLE) and generates a clock signal (CLK). Such as figure 2 As shown, the wobble signal is obtained from a wobble track on a recordable optical disc, and contains address information of the wobble track. The clock signal is used to control the writing path of the recordable optical disc drive, and serves as a reference for the recording clock. For the DVD-R / RW specification, one wobble signal period is equivalent to 186 recording clock signal periods, and for the DVD...

AI Technical Summary

Problems solved by technology

Using a codec means that the CD-ROM requires additional hardware, thus increasing the cost and complexity of the CD-ROM

Another problem with the prior art proposed by Kuroda et al. is that it is impossible to synchronize the data blocks written to the disc after the address information has been detected by the pre-groove until the next pre-groove is detected.

Images