Boots – shoes – and leggings
Patent
1983-12-16
1987-05-12
Chin, Gary
Boots, shoes, and leggings
364724, 358138, 340347SH, 324 77B, G01R 2316
Patent
active
046654941
ABSTRACT:
An input audio signal is AD converted into digital signals which are processed by a central processing unit (CPU) in which Fast Fourier Transform (FFT) operation and power spectrum calculation are effected. As a result power spectrum data is obtained, and then position determination is effected to determine the position of each bar of a bar graph to be displayed on a display unit screen, according to the power level at different frequencies within the spectrum of the audio signal. Pattern data is then produced in correspondence with the determined position, and output data from the CPU is fed via a video display processor to a video RAM, thereby displaying the spectrum by way of a predetermined pattern of a bar graph on the screen. In order to reduce the number of digital data used in FFT operation the input audio signal may be divided into a plurality of different frequency bands so that different sampling frequencies are used for AD conversion of signals of respective bands. As a result, operating time is reduced. To further reduce the operating time the CPU may be arranged to execute parallel operations in various manners. Furthermore, two or more CPUs may be employed to further increase the operating speed.
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Mesures, vol. 44, No. 3, Mar. 1979, pp. 61-73, Paris, FR; "l'Analyseur de Spectres: Un Outil Indispensable", p. 66, column 1, line 11,-column 2, line 33; FIG. 5.
Journal of Electronic Engineering, vol. 17, No. 164, Aug. 1980, pp. 54-56, Tokyo, JP; K. Shirakawa, "FFT Spectrum Analyzers Making Great Advances".
Inami Mamoru
Otsuki Zenju
Tanaka Yoshiaki
Chin Gary
Victor Company of Japan , Limited
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