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Results tagged with fft
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user 5762
The fast Fourier transform is an efficient algorithm to compute the discrete Fourier transform (DFT) and its inverse.
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determining walsh function components of signal after passing through non linear process
When a sum of sine waves is passed through a non linear process, harmonics and intermodulation distortion products are created, which are visible when applying an FFT to the signal. …
- 187
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3
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how were DTMF frequencies determined exactly and how can I extend them?
I've been playing with DTMF frequencies and the Goertzel algorithm, and would like to know exactly HOW the DTMF frequencies were determined. I understand that they were chosen such that none of the fr …
- 187
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2
answers
408
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how to make fft ignore phase shift when only interested in magnitude
I have a signal that consists of a sine wave, on which I apply a rectangular window and then an FFT. …
- 187
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1
answer
327
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Magnitude of intermodulation distortion products?
Is there any way for the harmonics or intermodulation distortion products to have a magnitude larger than the magnitude of any of the two frequencies, when calculating an FFT? …
- 187
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transmitting data using phase modulation of two sine waves passed through distortion
I plan on using an FFT to determine magnitude and phase changes of the signals. I am hoping to retrieve the symbols from the phase changes I detect using the FFT. …
- 187
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1
answer
1k
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relationship between block size and detected frequencies in goertzel algorithm
I'm trying to use the goertzel algorithm to detect a pair of frequencies in a signal.
The sample rate I'm using is 8000 hz, and the size of the incoming sample buffer is 60 samples.
I have a large …
- 187
0
votes
1
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495
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Change of bin magnitude when phase of signal changes when doing FFT?
I am working on an implementation in which I need to apply an FFT to determine which of 4 frequencies are present in a signal. … I am doing a 64 point FFT on a buffer which only is partly filled (the remainder of the buffer is zero-ed). …
- 187