DIGITIZING MICROBAROGRAPH DATA.
GEOTECH ALEXANDRIA VA ALEXANDRIA LABS
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The report describes a technique for converting ESSA analog microbarograph data into a computer compatible, digital format. Data detected by the microbarograph array are recorded on magnetic tape at a central recording site, having been transmitted over telephone lines as frequency-modulated FM signals. The array selected for testing the technique is located at Huancayo, Peru, and is operated by the Instituto Geofisico del Peru. At the central recording site the signals are demodulated and recorded as amplitude-modulated AM signals. In order to analyze the extremely slow speed AM signal on a digital computer, the analog signal must be translated into a digital format for input to the computer. The analog-to-digital conversion ADC of such signals requires the development of a technique and the documentation of that technique is the purpose of this report. Author
- Electrical and Electronic Equipment