Patent ID: 6111829
Filing Date: 2000-08-29
Classification: G11B

Abstract:
A track traverse signal detecting apparatus comprising:a pickup for reading data recorded on an optical medium and outputting a radio frequency signal;a radio frequency signal processing unit for receiving said radio frequency signal from said pickup, amplifying said radio frequency signal and detecting a RF envelope signal from the amplified radio frequency signal;a tracking error signal generating unit for generating a track error signal;a first track traverse signal generating unit for generating a first track traverse signal based on said tracking error signal;a second track traverse signal generating unit for generating a second track traverse signal based on a range which the RF envelope signal varies and a reference level;a control unit for monitoring said second track traverse signal using said first track traverse signal and outputting a control signal; anda reference level generating unit for generating the reference level, used in generating the second track traverse signal, based on said control signal, wherein said control unit reads a duty ratio of said second track traverse signal and outputs the control signal to said reference level generating unit so as to cause the duty ratio of said second track traverse signal to tend toward approximately 50:50.