inverse fft造句

• The test consisted of invoking Forward and Inverse FFT . Everything worked.
• Consequently, the 1024-point inverse FFT ( IFFT ) output contains only 200 samples of edge effects ( which are discarded ) and the 824 unaffected samples ( which are kept ).
• :: One use of a FFT ( Fast Fourier Transform ) of data is that one can apply filtering in the frequency domain, such as reducing or boosting certain frequency ranges, then convert back to the original domain via an IFFT ( Inverse FFT ) . talk ) 23 : 30, 24 October 2009 ( UTC)
• In practice, when multiplying a column vector \ mathbf { x } by \ mathbf { G } _ 1, we take the inverse FFT of \ mathbf { x }, set the first N values in the result to zero and then take the FFT . This is meant to remove the effects of the circular convolution.
• In practice, the O ( " N " ) additions can often be performed by absorbing the additions into the convolution : if the convolution is performed by a pair of FFTs, then the sum of " x " " n " is given by the DC ( 0th ) output of the FFT of " a " " q " plus " x " 0, and " x " 0 can be added to all the outputs by adding it to the DC term of the convolution prior to the inverse FFT . Still, this algorithm requires intrinsically more operations than FFTs of nearby composite sizes, and typically takes 3 & ndash; 10 times as long in practice.