fft

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Gaussian Blur with FFT Questions

I have a current implementation of Gaussian Blur using regular convolution. It is efficient enough for small kernels, but once the kernels size gets a little bigger, the performance takes a hit. So, I[详细]

2023-03-28 05:34 分类：问答
Comparing audio recordings

I have 5 recorded wav files. I want to compare the new incoming recordings with these files and determine which one it resembles most.[详细]

2023-03-28 05:14 分类：问答
Given MP3, is it possible to break out different instruments using Fast Fourier transform (FFT)?

I am working on a music visualizer and I\'d like to display a different visual element for each instrument.For example, blue bar representing vocal, red bar representing guitar, yellow bar representin[详细]

2023-03-27 05:54 分类：问答
Fast Fourier Transformation - Rounding Errors

I am transforming an image to a frequency spectrum, convolving it with a kernel, then inverse-transforming it back.[详细]

2023-03-27 03:23 分类：问答
FFT Convolution - How to apply Kernel

I\'m pretty new to Image Processing and found out that the FFT convolution speeds up the convolution with large kernel sizes a lot.[详细]

2023-03-26 17:50 分类：问答
Template Matching using FFT

Can anyone please explain how to perform template matching using FFT. The template is smaller than the original image.[详细]

2023-03-26 10:37 分类：问答
Intel FFT performance

What processor will perform better, i5-2500K or i7-960, regarding certain FFT operations per second, for example: complex FFT in-place on 16k buffer length?[详细]

2023-03-24 13:42 分类：问答
Channel vocoder using FFT - what to do about DC Component and Nyquist frequency?

I am trying to implement a channel vocoder using the iOS Accelerate vDSP FFT algorithms. I am having trouble figuring out how to treat the DC component and Nyquist frequency.[详细]

2023-03-22 17:26 分类：问答
MATLAB How to implement a Ram-Lak filter (Ramp filter) in the frequency domain?

I have an assignment to implement a Ram-Lak filter, but nearly no information given on it (except look at fft, ifft, fftshift, ifftshift).[详细]

2023-03-21 01:26 分类：问答
Understanding FFT output

I need some help understanding the output of the DFT/FFT computation. I\'m an experienced software engineer and need to interpret some smartphone accelerometer readings, such as finding the principal[详细]

2023-03-20 23:58 分类：问答