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A High-Rate Digital Data Recording Application of the Bell and Howell VR-3700B Tape Recorder.
M R Black, K A Ashcroft
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Abstract
A tape recording system was assembled to record scientific data on board a research vessel. Digital data equivalent to a single serial bit stream with a clock rate of 10.6 mHz were multiplexed onto six serial pulse-code-modulation channels of a Bell and Howell VR-3700B high-density digital tape recording system. The Bell and Howell enhanced-non-return-to-zero (ENRZ) code was used with a tape speed of 120 inches per second and a packing density of 16,500 bits per inch. Auxiliary data including compass reading, time, ship's speed, event count, trial number, and analog amplifier gain were recorded on a seventh digital channel of the tape recorder. An interface system between the data source and the tape recorder was developed for handling and formatting both recorded and reproduced data. Facility was provided to allow playback of recorded data at one thirty-second times real time for detailed analysis.