Reproduction signal processing apparatus

摘要

A reproduction signal processing apparatus includes a wave-shaping apparatus (100) including a detection circuit (3,4) for detecting a reproduction signal stored in an optical disk (1) and reproduced by an optical pickup circuit (2), using a prescribed detection time constant to detect at least one of an upper envelope (RSU) and a lower envelope (RSD) of the reproduction signal (RS); an averaging circuit (5) for putting a weight represented by a weighting coefficient to at least one of the upper envelope (RSU) and the lower envelope (RSD) detected by the detection circuit (3,4) to calculate an average value (AVE) obtained using the at least one of the upper envelope (RSU) and the lower envelope (RSD); and a subtraction circuit (7) for subtracting a signal corresponding to the average value (AVE) calculated by the averaging circuit (5) from the reproduction signal to output a wave-shaped signal (SS). The reproduction signal processing apparatus further includes an A/D converter (1300) for performing A/D conversion of the wave-shaped signal output by the subtraction circuit. <IMAGE>