| 摘要 |
An optical disk drive capable of error-free reading of any such optical disks as CDs, CD-Rs and CD-RWs in the face of a possible offset in the asymmetry of the RF data signal from the transducer. Included is a comparator for providing a binary data signal comparing the RF data signal with a reference voltage fed back from the comparator output via a low-pass filter. For optimization of the reference voltage for most error-free reading, an optimization circuit is provided which supplies a series of corrective values to be added to the reference voltage. Having an input connected to an error detector/corrector circuit on the output side of the comparator, the optimization circuit compares the error rates at all the corrective values added to the reference voltage and determines the optimum corrective value at which the error rate is at a minimum.
|
