Recorded information evaluation method and device and information recording medium therefor

摘要

From an optical disc on which physical address information is recorded in the form of phase modulation of a groove wobble, a wobble signal is optically obtained which is affected by the groove wobble. The wobble signal is phase detected by a phase detector and then fed into a low-pass filter. In a jitter calculator the value of sigma/T is calculated from the standard deviation sigma of a jitter distribution obtained from the output of the low-pass filter and the period T of a symbol clock for the phase modulation to evaluate the recorded physical address information.