Digital reading device for facsimile apparatus

A digital reading device for facsimile apparatus, comprising an objective for focusing an image of a line of a document formed of a plurality of points on to a series of reading elements which generate a series of analog signals in response to the points read on the line, said points having various spatial frequencies, an A/D converter, and a circuit for amplification and filtering of said analog signals arranged between said reading elements and said converter, wherein said circuit is operable to compensate for response of the objective and of the reading elements at the various spatial frequencies of the said points, and wherein said circuit is a multistage circuit comprising an amplification and filtering stage having such a modulation transfer function as to effect the compensation by emphasizing the analog signals due to the response of said objective and said reading elements at the high spatial frequencies of said points within a predetermined range of frequencies, whereby the fall-off in amplitude of said analog signal at such high spatial frequency is compensated as to supply to said converter output analog signals with an amplitude independent of said spatial frequency.