Reconstructing a Serial Pulse Train from Parallel Data Recorded on Magnetic Tape
AuthorHadady, R. E.
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AbstractOn-board data stores in deep-space probes, spacecraft, satellites, and aircraft, frequently require the extensive bit storage capability of a magnetic tape recorder. For compatibility with other systems, it is necessary in some cases to be able to reproduce the data in serial form at a synchronous rate. To take maximum advantage of the storage capability of magnetic tape, however, it is desirable in many instances to record the data in a parallel format; i.e., the technique used in magnetic tape recorders used with ground based computers. Reconstructing a serial pulse train with a synchronous bit rate from parallel data recorded on magnetic tape involves some problems which are peculiar to magnetic tape recording equipment. Variations in tape speed (flutter), dynamic skew (wobble) of tape as it passes over the record and playback heads and static skew of the data on the tape resulting from head gap scatter and mean gap azmuth alignment results in nonsynchronous data being generated during playback. To provide synchronous data output, it is therefore necessary to provide a buffer between the output of the magnetic tape recorder and the system accepting the data. Recorder characteristics are examined with respect to their effect on the degree of non-synchronism. Furthermore, the size and complexity of buffers necessary to provide synchronous output data is considered.
SponsorsInternational Foundation for Telemetering