Apparatus for driving a record carrier

摘要

An apparatus for driving a record carrier according to the invention comprises a transducer for generating a read signal in response to patterns recorded at the record carrier and displacement means for displacing the transducer and the record carrier with respect to each other. Out of the read signal an auxiliary signal having a relatively low frequency content is generated. The apparatus comprises binary signal generating means for generating a binary signal out of the auxiliary signal including first hold means for generating a first hold signal, second hold means for generating a second hold signal, signal combination means for generating a slicing signal out of the first hold signal and the second hold signal, and comparing means for comparing the auxiliary signal with the slicing signal and outputting a binary output signal. The first hold means are adapted for temporarily maintaining the first hold signal at a value substantially corresponding to a top value of the auxiliary signal. The first hold means are further adapted for temporarily maintaining the value of the first hold signal at a value substantially corresponding to a bottom value of the auxiliary signal augmented by an addition value. The second hold means are adapted for temporarily maintaining the second hold signal substantially at a value corresponding to a bottom value of the auxiliary signal. The second hold means are further adapted for temporarily maintaining the value of the second hold signal at a value corresponding to a top value of the auxiliary signal diminished by a subtraction value.