2 votes
Accepted

Two synthetic signals with same frequency result in two different spectrogram results

Assuming you're actually synthesizing your signals as Hilmar pointed out in the comments: ...
Jdip's user avatar
  • 6,030
2 votes
Accepted

Sampling a sinusoidal signal smaller than Nyquist rate

As per the suggestion by @Dan Boschen, I am converting my comments into a short answer. For simplicity, ignore units, so the 50 kHz signal frequency becomes 50, the 7 kHz sampling frequency becomes 7 ...
Ed V's user avatar
  • 785
2 votes

What's Nyquist frequency in DFT?

In a sampled system, the Nyquist Frequency is $f_s/2$ where $f_s$ is the sampling rate. Each bin in a N sample DFT is centered on frequency $f=k f_s/N$ with $k$ indexed from $0$ to $N-1$. Thus in an $...
Dan Boschen's user avatar
1 vote
Accepted

How does the sampling rate of a digital filter limit the sampling rate that can be used for replay of filtered signal?

Actually, the filter you designed is not a lowpass filter with cut-off frequency of 300 Hz. You designed a digital lowpass filter of cut-off frequency at $\frac{300}{10000}\cdot2\pi=0.06\pi$ in ...
ZR Han's user avatar
  • 3,228
1 vote

Nyquist plot of $1/[s(s+1)(s+2)(s+3)]$

You missed an extra element in MATLAB while doing this. I think your defined your transfer function as: H = tf(1,[1 6 11 6]); Nyquist(H) which gives you this ...
Jacob's user avatar
  • 121
1 vote
Accepted

How to compute the ifft of a constant value?

The sinc function (extended to infinity) is an ideal lowpass filter. Its FFT, then, ideally, is a string of identical numbers, except the numbers corresponding to frequencies above the cutoff would be ...
user25849's user avatar
1 vote
Accepted

Time-interleaved ADCs, Nyquist zones et al

I'm going to start by adding some notation. The author leaves us with $y^{(k)}_n = x_{4n + k} + \cdots$, which leaves us juggling two indexes. If I'm reading the diagram correctly, the index $m$ is ...
TimWescott's user avatar
  • 12.7k

Only top scored, non community-wiki answers of a minimum length are eligible