Questions tagged [ifft]
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324 questions
0 votes
0 answers
24 views
Cross-Synthesis Algorithm Help
If I'm trying to create a cross-synthesis/spectral morphing effect between two signals in real-time using an stft (similar to a plugin like Melda's MMorph or Zynaptic's Morph 3), what would be the ...
- 1
0 votes
1 answer
51 views
Is any information lost when computing an IFFT on a single sided spectrum vs the double sided spectrum?
I've known for a while that it is important to use a double sided spectrum when performing an IFFT in order to ensure the recovered time domain signal is purely real. However I've also seen that using ...
- 35
0 votes
1 answer
162 views
How basic IFFT based distance estimation works?
I need help understanding distance estimation using IQ data So for the input we have IQ data, for 72 channels This is passed to IFFT function, and then from the result peak index is identified. A ...
- 3
0 votes
2 answers
128 views
How to Oversample a QAM-Modulated Signal in the Time Domain by Zero-Padding in Frequency
Let $ s \in \mathbb{C}^{N \times 1}$ be a vector containing QAM-modulated symbols. Apply the inverse Discrete Fourier transform $F_N^H $ (an $ N \times N $ IDFT matrix) to $s$, yielding $ y = F_N^H \, ...
- 433
1 vote
1 answer
102 views
How to implement DST-II/III with FFT
I have a Jupyter notebook where I’ve been figuring out the equivalence of scipy’s DCT and DST variants with the FFT. It’s very confusing, especially for the DSTs, because the indexing is really hard ...
- 287
3 votes
1 answer
295 views
How to convolve two signals of different sample rates and lengths?
I have two spectra (one is an aperiodic signal and the other is a transfer function) and I would like to multiply these in the frequency domain, followed by an IFFT to calculate the expected output ...
- 35
0 votes
2 answers
130 views
Why are two signals with different FFTs producing the same impulse response?
I have two different FFTs, their complex values are visualized here: They share similar structure but they're clearly different values. When I do the inverse FFT on them however, they both have ...
- 11
0 votes
1 answer
88 views
FFT and IFFT with arbitray phase modification in C lang
I acquire an audio signal via an I2S codec through a microphone. I test with a real sinusoid of a 1khz 0.5Vpp generator. I process the signal via an FFT in C language with a ESP32 and once the ...
