Data capture device and method thereof

#This application claims the priority benefit of Taiwan application serial no. 101108147, filed on Mar. 9, 2012. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

#1. Field of the Disclosure

#The invention is directed to a data capture device and a method thereof, and more particularly, to a data capture device for capturing row data in a burst cutting area (BCA) and a method thereof.

#The accompanying drawings constituting a part of this specification are incorporated herein to provide a further understanding of the invention. Here, the drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

#FIG. 1 is a schematic view corresponding to a burst cutting area (BCA) in an optical disk specification.

#FIG. 2 is bit pattern corresponding to synchronization bytes and resynchronization bytes in the optical disk specification.

#FIG. 4 is a schematic diagram showing a data capture device according to one embodiment of the invention. Referring to FIG. 4, a data capture device 400 is provided, which includes a signal processing unit 410, a frequency locked circuit 420 and a match circuit 430. As shown in FIG. 4, the signal processing unit 410 receives a radio frequency (RF) signal corresponding to a burst cutting area (BCA) in an optical disk. That is, when a light beam emitted by an optical pickup head illuminates the BCA, an RF signal generated thereby is transmitted to the signal processing unit 410.

#For operation, the signal processing unit 410 converts the RF signal to a return-to-zero signal RZ. For example, in an exemplary embodiment, the signal processing unit 410 includes a high pass filter (HPF) 411 and a slicer 412. Therein, the HPF 411 filters high frequency noises out of the RF signal. The slicer 412 slices the filtered RF signal into a digital signal of “0” or “1”, i.e. the return-to-zero signal RZ. In other words, the signal processing unit 410 converts the RF signal into a corresponding binary signal.

#The frequency locked circuit 420 estimates a minimum interval length by the return-to-zero signal RZ in a plurality of detecting periods and generates an enable signal den according to the minimum interval length and the return-to-zero signal RZ. Here, the minimum interval length is approximately 1 T as estimated. In other words, the frequency locked circuit 420 uses 1 T as a basis to generate the enable signal den. Therefore, even though the maximum interval length of the return-to-zero signal RZ is larger than 4 T, a correct enable signal den can be generated according to the present embodiment. Further, comparing with the related art, the related art requires a counter with a larger bit number to detect the maximum interval length of the return-to-zero signal RZ. On the contrary, the present embodiment can utilize a counter with a smaller bit number to detect the minimum interval length of the return-to-zero signal RZ so that the hardware space and manufacturing cost of the data capture device 300 are further decreased.