Regarding the sound we have to apply the same care as the image whether to resample digitized material or digitalize old material stored in analog formats. Original 35mm optical soundtrack scanning and common problems such as excessive presence of noise, clicks, saturation, unbalanced mixes or out-of-phase will be restored to enhace mono mixes to upmix them in stereo, stereo mixes to upmix them in 5.1 surround with real center, Music & Effects mixes or even Dolby Digital and DTS encoding, surround embedded in broadcast masters in HD / SD tapes using Dolby E system. High-resolution loudness normalization compliant with recommendations by the International Telecommunication Union (ITU-R BS.1770-2) and the European Broadcasting Union (EBU R128) for determining subjective program loudness and true-peak signal level.
Before / after audio mastering example by Cinema Gotika.
Original 35mm optical soundtrack scanned at Cinema Gotika. The restoration and mastering process includes a dynamic range enhacement to improve low and high frequencies.