Analog System for Analyzing Infrasonic Signals Monitored in Field Experimentation

Large quantities of ultralow-frequency acoustic data, accumulated over long periods of time, can be analyzed by several methods. Preliminary analysis of the analog waveform determines specific areas of primary interest prior to digital-computer analysis. Data of no consequence can be discarded, or their worth graded, to scale their importance for computer processing. This technique also provides a means of expediting initial findings and primary conclusions can be deduced. This study was conducted by the University of California, Los Angeles and entitled “Ionospheric Disturbance Experiment.” The raw tape-recorded data are played back through an electronic system. Some important parts of this system are narrow-bandpass filters and a Missalyzer (sound spectrograph). Some sample results are summarized.