Being the non reliable detection device in order to generate the non reliable decisive signal according to

摘要

(57) Abstract This invention regards the non reliable detection device which forms the non reliable decisive signal according to the input signal. As for this device, the 1st comparator unit which supplies the 1st comparator output signal the input terminal which receives the aforementioned input signal (1) and the aforementioned input signal 1st threshold value of correct polarity (+V _d) with by comparison, in consequence of that (2), when the aforementioned 1st comparator output signal, the aforementioned input signal exceeds 1st threshold value, 1st signal value (the 1) from 2nd signal value (+1) to or the 1st comparator unit which is transited 2nd threshold value of negative polarity (V _d) with comparing (2) and the aforementioned input signal to oppositionThe 2nd comparator unit which supplies the 2nd comparator output signal in consequence of that (4), when the aforementioned 2nd comparator output signal, the input signal exceeds 2nd threshold value, the 3rd signal it is worthy of (the 1) from the 4th signal to be worthy of (+1) to or the 2nd comparator unit which is transited it possesses (4) to opposition. This invention furthermore regards also the reader information from the record carrier. This device possesses the non reliable detection device.