| Popis: |
This device provides for rapid analysis of short samples of speech and other sounds. It permits direct viewing of the energy‐frequency distribution of the sound at instants of time in a two‐dimensional pattern, and also over intervals of time as a three‐dimensional pattern. Magnetically recorded on a disk at slow speed, and speeded up 200 times on playback, the sample of sound is analyzed rapidly by a broad band high frequency system.The three‐dimensional portrayal (in time, frequency and amplitude) shows the whole sound sample, including an interval of about 12 sec., on one cathode‐ray tube, together with a movable indication of the point in time at which the “instantaneous” or two‐dimensional frequency‐amplitude section, appearing on another tube, is taken. This two‐dimensional pattern displays amplitude on a decibel scale and covers about a 40 db range. The complete pattern is made up of 190 amplitude values for the 100 to 4000 cycle frequency range so that the pattern is formed by 190 vertical lines. ... |
