Optical disc signal processing apparatus and optical disc reproduction apparatus

An optical disc signal processing apparatus is provided which comprises a rotation control section for measuring and outputting the number of edges within a predetermined time for a binary signal obtained from an RF signal reproduced from an optical disc on which information is recorded, a detecting section for detecting a missing portion of the RF signal, and a parameter control section for, when a missing portion of the RF signal is not detected, calculating and outputting a rotation control parameter for controlling a rotation of the optical disc based on the number of edges obtained by the rotation control section, and when a missing portion of the RF signal is detected, controlling the rotation control parameter so that proceed stable rotation control based on signal from disk.