Patent ID: 6882612
Filing Date: 2005-04-19
Classification: G11B

Abstract:
1. A BCA (Burst Cutting Area) evaluation device for evaluating a recording condition of a BCA on a rewritable DVD, comprising: signal receiving unit operable to receiving a signal read from the rewritable DVD; threshold generating unit operable to generating different threshold values; pulse signal generating unit operable to generating pulse signals which are each a result of comparing the read signal with a different one of the threshold values; pulse counting unit operable to counting a number of pulses of each pulse signal, and outputting counted numbers; and evaluating unit operable to evaluating the record condition of the BCA, based on a correspondence between the threshold values and the numbers, wherein the evaluating unit evaluates the recording condition of the ECA, by judging whether IBSmin, IBMmax, IBS, and IBRmax that are determined based on the correspondence between the threshold values and the numbers satisfy the following two inequalities: wherein IBSmin is the lowest voltage of an RF signal which is not a BCA signal, IBMmax is the highest voltage of the RF signal, IBS is the mean average of the RF signal which is not the BCA signal, and IBRmax is the highest voltage of the RF signal which is not the BCA signal.