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The construction, function, displaying method, and example of display of a three-dimensional on-line displaying system for sound spectrogram are shown. In this system, frequency analysis (FFT) is done by a computer, and its results (frequency spectrogram) are displayed on a color picture tube changing the magnitude of frequency component to colors. Following two systems are presented : 1) A system using a large-type computer HITAC-5020 in which the data-input and analysis are carried out by means of "off-line", and the data-output and display of the analyzed results are carried out by means of "on-line". 2) A system using a small-type-computer HITAC-10 in which all steps from input to display are carried out by means of "on-line". It is shown that former system 1) is suitable for displaying the abundant data and latter 2) is suitable for handling the input data required to obtain quick response. Two methods of display are shown. One is the moving-pattern method in which the spectrograms are displayed continuously an electric news-sign-board. The other is a method Combined with the above-mentioned one and the standing-pattern displaying method in which the analyzed results to be given intermittently and slowly are able to display continuously and slowly in the same timing as the analyzed results. The arrangement of color is decided so that each color assigned to each step of intensity is sensed continuously and at equal intervals on the sensory response. In this system, 15 steps of color are used, and red color is selected in order to correspond to the highest step of intensity and blue color to the lowest one. A fragment of the effect of these systems is shown with an example of analysis and display for the sailing sound of tanker.
社団法人日本音響学会の論文
1973-12-01

時間的に変化する周波数スペクトルのオンラインカラー表示

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