Patent attributes
A replay signal, obtained on reproducing a recording medium, on which has been recorded a digital signal, is supplied to an input terminal (1), and quantized by an A/D converter (8). The so quantized signal is processed by an integrator (20), formed by a first order IIR filter, so as to be adjusted in gain by an amplifier (21). The quantized replay signal is also processed by a differentiator formed by a combination of a first order FIR filter (22) and a first order IIR filter (23) so as to be then adjusted in gain by an amplifier (24). The resulting signal is then supplied to an adder (25) where it is subtracted from an output signal of the amplifier (21). In this manner, the differentiation/integration equalizer, formed by an analog circuit, is constructed by a digital circuit of a simplified configuration without raising the number of orders of the filters. The replay signal is processed by differentiation/integration such as to satisfy the equalization standard.
