Digital recorders that record multiple channels of structural dynamic data in a pulse code modulation (PCM) format on VHS tape, are replacing frequency modulation (FM) recorders. Formerly, engineers digitized analog data from FM tape recorders using an analog to digital (A/D) converter to generate computer files for frequency, time history and statistical analysis. Advantages of digital tape recorders include wide dynamic range, low noise, quick digitization, zero phase delay between channels and no tape recorder artifacts. The recorders quickly store large volumes of dynamic data. Laboratory engineers are investigating efficient techniques to transfer digital data from digital tape recorders to personal computer (PC) files.
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