Questions tagged [zoh]
the zero-order hold (ZOH) is a linear time-invariant (LTI) model of the piecewise constant output of a digital-to-analog converter (DAC).
15
questions
0
votes
1
answer
29
views
What is damping ratio and natural frequency of z-domain with real negative pole and undifine region
As ilustrated in controlsystemsacademy shown relation between z-domain and s-damain poles by this image.
with contour for natural frequency and damping ratio given by these equations.
However there ...
- 101
4
votes
1
answer
74
views
How does function c2d in MATLAB manage fractional delay?
the function c2d allows to convert a continuous laplace transfer function to a discrete z-transform transfer function. The base method is the Zero Order Holder. In example:
...
0
votes
1
answer
294
views
Resampling a Zero Order Hold signal
I have a sine signal whose frequency is $f$ sampled and then reproduced by a DAC as a zero order hold signal with sampling period $T_1$. The DAC signal is then reacquired with a sampling period $T_2 = ...
- 23
1
vote
0
answers
322
views
First order hold from zero order hold filter
I'm stuck in this question for more than 4 hours. (h is the sampling period)
I simplified the block diagram but it just seems impossible to get the FOH transfer function from the reduced block ...
- 11
0
votes
1
answer
391
views
Determine impulse resonse of First Order Hold (FOH)
Question, how can I determine the impulse response function of a first order hold? On Wikipedia it is simply stated as:
$$ h_{\mathrm{FOH}}(t)\,= \frac{1}{h} \mathrm{tri} \left(\frac{t}{h} \right) =...
- 135
0
votes
1
answer
305
views
ZOH DAC amplitude formula testing
We have an expression shown in red bellow for non ideal DAC ZOH,which links the sampling frequency to the amplitude loss of the input signal.
I took $f_b=1kHz$ and $f_{noise}=4kHz$
$f_{in}=f_b+f_{...
- 171
0
votes
2
answers
119
views
ZOH non ideal sampling loss formula
Hello i am trying to calculate the amplitude loss of non ideal sampling.
My signals amplitude is 10 at 70 frequency.
When we sample it at Fs=400 we have al 0.511 loss as shown in plot bellow.
How can ...
- 171
0
votes
2
answers
373
views
Up-sampling using ZOH
The basic idea of up-sampling is to add $M-1$ zeros after each sample.
I need to make upsampling(factor of 3) of the function $rcosdesign(\beta, M, T)$ using the ZOH filter in Matlab.
$\beta=0.25$,
$M=...
- 3
2
votes
0
answers
767
views
Derivation of ZOH Discretization
I'm trying to understand the derivation of the zero order hold discretization method, and I have a couple of questions about some of the steps.
I think I understand the first part, this is just the ...
- 191
0
votes
1
answer
701
views
Not sure how to perform ZOH upsampling
Sorry if the question looks pretty naive. My goal is to up-sample a given signal x[n] by a factor of M using the zero order hold interpolation function.
The basic idea of up-sampling is to add M-1 ...
- 101
1
vote
2
answers
157
views
Ideal sampling using sinc funcion
Let $ x(t) $ be a bandwidth limited signal such as $ \forall |\omega|>\frac{\pi}{T} : X^F(\omega)=0 $ while $ X^F(\omega)$ is the signal's Fourier Transform.
Let us denote $y[n]=\int_{-\infty}^{\...
- 113
0
votes
1
answer
9k
views
Construction signal using zero-order-hold
I have a signal $x(t) = \sin(2\pi t)$ with $t \in [0,1]$. The signal $x_s(t)$ is the sampled signal with a sampling period of $T_s = 0.05$. Now I want to compute the reconstructed $x_r(t)$ signal ...
- 135
1
vote
1
answer
383
views
Zero Order Hold with polyphase resampler
I'm trying to design a FIR filter(direct form) the coefficient of which will be used to design a polyphase resampler that does Zero-Order Hold resampling. If the direct form impulse response is ...
- 418
0
votes
2
answers
910
views
Zero-order interpolation problem
Let $x_c(t)=\cos(\omega_0t)$. This signal is sampled with $\omega_s$, which is greater than the Nyquist rate. It is then interpolated with a zero-order interpolator. The signal obtained is $y_c(t)$. ...
- 4,980
0
votes
3
answers
478
views
Does the hold part in sample and hold turns the signal from discrete to continuous?
I am trying to link sample and hold to discrete and continuous time domain.
Could someone please confirm:
When sampling but not holding for "an extended" period of time, you have discrete samples.
...
- 125