Interpolating gain amplifier for information reproducing apparatus

Abstract

An information reproducing apparatus which includes: pickup section for converting information recorded in a recording medium into an electrical signal; preprocessing section for amplifying a signal output from the pickup section; automatic gain control circuit for receiving a signal output from the preprocessing section as an input signal and for eliminating an amplitude change component other than the information from the input signal; and digital signal reproducing section for reproducing a digital signal corresponding to a signal output from the automatic gain control circuit, the automatic gain control circuit including: amplifier section for amplifying the input signal so as to be output as an output signal, and for receiving a control signal for controlling a gain; and control section for controlling the gain of the amplifier section, the control section including: amplitude detector for detecting an amplitude of the output signal; control signal generator for generating a control signal corresponding to the amplitude of the output signal; memory section for storing the control signal; and interpolation section for detecting an error signal caused by an input signal in an impulse form from the control signal and replacing the error signal with an interpolation signal.

Dependencies are inferred from the claim text.