9. Improvements in transfer technologies

Transfer technologies from originals may improve in the future. In particular, there may be improvements in the retrieval of signals from the original carrier. Original analogue carriers may contain secondary information which falls outside the frequency range of the primary information and which may assist in correcting inaccuracies in the original recording. Most current transfer technologies result in an irretrievable loss of this information.

Because of the potential for improvements in primary and secondary information retrieval and the availability of ever increasing digital resolutions, all transfers should be considered preliminary. Hence the original carriers and suitable play-back equipment must be preserved whenever possible. However, although the possibility of a re-transfer in the future must be considered, all transfers must be carried out to the highest standards possible at the time of transfer. They may, in the future, become the last transfer from the originals.

Comment:
A recent improvement in transfer technology is the laser replay of some mechanical carriers which provides contact-less, optical replay. Information about speed fluctuations (wow and flutter) of analogue magnetic tapes may be found in the variations of the reproduced bias frequency. Processes that can use this information to correct the primary information are now available and may become part of future transfer routines.