Questions tagged [sampling]
In signal processing, sampling is the reduction of a continuous-domain signal to a discrete-domain signal.
1,131
questions
3
votes
2
answers
228
views
How does a quantized signal represent all magnitudes?
I am having trouble with some intuition with quantization, bit-depth, noise floor, dynamic range and signal/noise ratio. Let's say I have two signals, $s_1$ and $s_2$ that are 1hz sine waves, with ...
0
votes
1
answer
41
views
s to z domain transformation
I have $2^{nd}$ order bessel filter transfer function. I want to model this analog bessel filter in FPGA. For this I need its digital or discrete form. I am trying to get digital filter's coefficients ...
- 11
0
votes
1
answer
37
views
CPM Modulation and Demodulation, How to determine the values for normalized bandwidth?
See table related to CPM Modulation which specifies $L$, $h$, $B_{norm}$ and sampling rate $f_s$. $B_{norm}$ and the sampling rate $f_s$ are directly related and I understand that relationship. What I ...
2
votes
1
answer
109
views
Compressed sensing and Logan's Theorem
The authors of the book, Data Driven Science & Engineering Book webpage, also have a Youtube Channel. ne of the videos on compressed has the title "Beating Nyquist with Compressed Sensing.&...
- 594
0
votes
1
answer
67
views
Meaning of the phase of a sample
In a sampled signal RF signal with I,Q parts, if we represent each sample as an amplitude and phase, what does the phase of a sample mean? Does it say something about the RF signal at that point of ...
- 109
1
vote
1
answer
38
views
does extension to reals of an arbitrary signal with a zero tail eventually cross a threshold
Suppose I have a sampled signal $S(x) :=\space [ \space ..., X_{-2}, \space X_{-1}, \space 0, \space 0, \space 0, \space 0, \space ... \space ]$
where $\{X\}_{n}$ is bounded by $\pm1$ when n is a ...
- 111
0
votes
0
answers
21
views
Sinc droop in a simple sampling mixer
This question is about the conceptual interpretation of a track-and-hold mixing operation implemented conceptually below, where an output $y(t)$ tracks an input $x(t)$ for half of a period $T_{LO}$ ...
- 349
0
votes
0
answers
34
views
Frequency sampling
How does nyquist sampling theorem works. For example, given a signal with rang 0.5 to 1.5 Hz, why does the fs is 2 Hz?
- 11
0
votes
3
answers
128
views
DAC - Can we create and use frequencies above Fs/2?
I understand how the ADC and Nyquist works. Anything above Fs/2 can be indistinguishable from frequencies inside Fs/2 so we use an alias filter to remove them before sampling. This can also be an ...
- 109
0
votes
0
answers
48
views
Best Approach To Demodulate AM Signal
I have a way of direct sampling negative polarities and positive polarities using an ADC. I store the values separately. When I use Python to FFT, either polarity samples, the returned results can be ...
2
votes
1
answer
166
views
What is the Expression for Reconstruction After Derivative Sampling?
I've been trying to use Equation (1) in Linden and Abramson to reconstruct a signal using uniformly spaced samples of the signal and its first and second derivatives. The reconstruction seems to work ...
- 23
3
votes
4
answers
222
views
Why is sampling not “idempotent”?
This answer describes succinctly what sampling a continuous signal means in the frequency domain:
$$
\begin{align*}
x(t)\sum_{n=-\infty}^{\infty}\delta(t-nT)
&\leftrightarrow \frac{1}{T}\sum_{k=-\...
- 31
0
votes
1
answer
33
views
Resampling n timeseries datasets with different sampling frequencies
I am currently working on an IoT project that uses datasets from different sensors with differing sample rates fs = (1s, 30s,...). I combine this with API data <...
1
vote
1
answer
72
views
Multirate systems - downsampling
As my teacher explained the process in class, I wanted to write a MATLAB code for learning purposes that downsamples a signal with a downsampling factor of L. Here's the code I wrote and the output ...
- 103
0
votes
0
answers
38
views
Upsampling realtime data for sensor fusion
I am doing a real-time sensor fusion of gps and imu streams using a Kalman filter. Both streams are obtained independently (with geolocation and accl-gyro values) in real time. I am doing this in ...
- 1