A professional Digital Audio Mastering System using the U-type VTR with 3/4-in tape has been developed. The system is based on a PCM signal processor, an electronic editor, and a preview unit. The electronic editor and concerned techniques are described in this paper. Electronic editing techniques must be applied to the cartridge tapes because splicing them is not practical. The editor we have developed makes highly accurate editing (180µsec) possible without risking the original tape which cannot be attained with analog editing by splicing. Other facilities of this editor are cross-fading which can eliminate noise due to abnormal level changes at the editing point and level control of the signal being recorded. Since the signal data representing editing point are stored in the memory together with vicinity information, the editing point can be searched with the same feeling as in analog editing and rehearsals can be performed by recalling data from the memory device without running the tape. These functions have been made possible with digital filtering and data reduction techniques.
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