19 Power spectral density vs. FFT bin magnitude 8 What is a $BT$ (Bandwidth-Time) product with reference to modulation? 7 Applying DFT twice does not actually reverse an array. Instead, the first element stays in place while the rest of the array is reversed. Why? 5 How do I calculate the range of a fixed-point number with $a$ integer bits and $b$ fractional bits? 4 Can we choose a sampling frequency to remove unwanted noise at a specific frequency?

### Reputation (2,877)

 +15 Calculating $E_b/N_0$ from given SNR ratio +10 Convolution theorem for cross-correlation +10 Find power of a sum of sinusoids +10 Why do the DTFT and FFT give me completely different results for magnitude at a specific frequency?

### Questions (4)

 5 Time domain distortion vs Harmonics 2 DFT sinusoid's fundamental frequency, intuitively 0 Time-bandwidth product and uncertainty on harmonics 0 Overlap-windowing vs preserved information

### Tags (72)

 27 fft × 7 15 discrete-signals × 8 21 power-spectral-density × 3 14 signal-analysis × 6 20 fourier-transform × 14 12 proof × 6 20 magnitude × 2 12 bandwidth × 5 16 dft × 13 11 matlab × 7

### Bookmarks (152)

 178 “River” detection in text 134 Why is the Fourier transform so important? 123 What does frequency domain denote in case of images? 95 What is the physical significance of negative frequencies? 92 Why is it a bad idea to filter by zeroing out FFT bins?