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

Figure 1

Plots of the frequency response of NAB and CCIR pre- and postemphasis curves, respectively (a, b) and the filers for compensating the incorrect juxtapositions: NAB-CCIR (c) and CCIR-NAB (d). (a) NAB equalization. (b) CCIR equalization. (c) Filter for the NAB-CCIR correction. (d) Filter for the CCIR-NAB correction.

(a)

(b)

(c)

(d)