| 摘要 |
<p>PURPOSE:To perform Fourier transformation and inverse Fourier transformation at a high speed by making a function, which is monotone in terms of section, approximate a function to be Fourier-transformed and by performing analytic integration in each section. CONSTITUTION:From function input unit 1, required items such as time function f(t) to be Fourier-analyzed, divided time values t1, t2...tM of this function and angular frequencies W1, W2...WN for obtaining Fourier integral values are input. Then, time values t1... and angular frequencies W1... are input to and retained in data holding unit 3 and time function f(t) and divided time values t1... are applied to function approximation unit 2 to find function values f1...fM at respective times, which are held in data holding unit 3. Next, the data held in data holding unit 3 are sent to integral calculation unit 4, which performs arithmetic on the basis of expressions I and II for a Fourier analysis and the result is sent to function output unit 5 and displayed.</p> |
