Multimedia Archives: New Digital Filters to Correct Equalization Errors on Digitized Audio Tapes

Figure 2

(a) A comparison between the frequency response of the analog unstable filter (“analogue”), the digitized unstable filter (“bilinear”), and the approximated stable filter (“bilinear approximated”). (b, c) Approximation quantification in further detail, specifically focusing on low and high frequencies, respectively. (a) Overall comparison. (b) Low-frequency approximation. (c) High-frequency approximation.

(a)

(b)

(c)