Questions tagged [delay]
The delay tag has no usage guidance.
143
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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:
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How to determine Transmission Rate for Task Offloading in edge computing?
I am new to communication systems and am working on a model for task offloading on edge computing. One key parameter I'm aiming to determine is the data transmission rate. While I am familiar with ...
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Programming a delay in Matlab
Let $x(t)$ a signal of duration $T$, the sampling frequency is $f_s$.
I know the signal $x(t+\tau)$ orresponds to a signal delayed by a delay $\tau$. In Matlab, the signal $x(t+\tau)$ is given by: $[...
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Fourier transform of a delayed LFM chirp
I know that for a given signal $s(t)$ and a given delay $ \tau $, by the shift theorem:
$$ \mathcal{F}\{s(t-\tau)(f) \} = e^{-j 2 \pi f \tau} \mathcal{F}\{s(t)(f) \} \tag{1} $$
However, when I try to ...
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STFT frequency domain processing destroys window shape, makes synthesis glitchy
I have a signal processing chain which goes:
Every 256 samples, take 512 samples of input buffer
Apply a Hann window to the samples
Copy the windowed samples into the real components of a complex ...
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2
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Correlating signals in real-time when the time-delay is larger than frame-time
What are some possible approaches to address the challenge of correlating two signals when the time delay ($T_d$) from the source to the microphone is greater than the microphone's frame time ($T_f$)? ...
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Finding delay between signals
This should be a simple problem, yet I can seem to figure out what am I doing wrong.
I have a bunch of 1-D signals which I expect to look the same up to: shifting, maybe some scaling, and noise.
I ...
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Understanding Matched Filter, delay
I am trying to build a filter for the detection of signals with the known form in noisy and low-amplitude data.
I used a simple example in Python provided here:
https://www.youtube.com/watch?v=...
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1
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Replicating scipy.signal.lfilter with initial condition using IPP
I am trying to rewrite some Python signal processing code in C++ and am stuck trying to figure out how to replicate behavior of lfilter with initial condition.
The documentation for lfilter says that ...
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1
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Why this second part of the integral given by the gradient of the log-likelihood is zero
I am reading the book "Detection of Signals in Noise" by Robert N McDonough, A D Whalen. In chapter 10, they compute the gradient of the log-likelihood for the time of arrival. See attached ...
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How to estimate the delay in time domain when knowing the phase shift in frequency domain
I am strugling with how to compute the exact value of delay in time-doamin when knowing phase shift in frequency domain.
I have a analog circuit, I sweeped about 30 single tones frequency ranging from ...
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How do we determine the required sampling rate of a closed loop control system?
Consider the controlled dynamical system $\dot{x}_t = f(x_t, u(t-\tau_{sd}))$, where $0<\tau_{sd}$ denotes the time delay caused by sampling. It is intuitively clear that the time delay caused by ...
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Fractional Delay in Matlab Scale Signals
I am trying to write a function which takes an input signal and delays it by a non-integer index. The function is based on the ideal bandlimited fractional delay filter technique, already available in ...
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Real time signal processing in frequency domain
i'm doing realtime signal processing simulation.
it could be simple question.
if i multiply input L sample fft and M block filter in frequency domain and i do ifft
the output come out when index is L+...
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Introducing Feedback to Miller Puckette's Time-Domain Pitch Shifting Algorithm without Discontinuities
I've implemented Miller Puckette's time-domain pitch shifting algorithm (http://msp.ucsd.edu/techniques/v0.11/book-html/node125.html) in PureData's help files in C++ (my code here: https://github.com/...
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Issue Understanding Time Delay of a Digital Filter
I am new to the world of digital filters and am educating myself with the book Introduction to Digital Filters by J.O Smith III,. The author derives the frequency response of a very simplistic filter:
...
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340
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Audio compressor delay/lookahead
I am making a real-time audio compressor/limiter. I am in little doubt about the delay. What is typical delay times for a compressors or limiters delay/lookahead time?
Most other compressors I see don'...
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Audio crackles with delay in series
I am learning to write audio plugins using VST3 sdk.
I have an issue implementing 2 delays in serie, the audio starts crackling.
Here is the processing code:
...
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How do large tap counts effect FIR Filters for block data?
I am using the ARM CMSIS DSP library for a signal processing application. I find good filter performance when using tap counts that are in excess of 10% of the length of my data block. I understand ...
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Generating a 2D delay-Doppler channel matrix
I was wondering if anyone here has any idea on 2D delay-Doppler channel and how to generate the channel matrix?
Even a hint or a resource would be helpful. I just want to understand and visualize the ...
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1
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282
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Estimate the time delay of two signals
I am having 2 sets of data data1 and data2 .I wanted to find the delay between the two datasets.
Assume data1=[1 2 3 4 5 6 7 8 9 10] and data2=[0 0 0 0 1 2 3 4 5 6].From the data I know that, data2 is ...
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Matlab Pade approximation influence on bode plot and step response
I would like to approximate a delay via the pade approximation. I set a normal delay via the exponential term and I set a delay via the pade approximation and I look the difference between the both ...
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From Delay Spread to Coherence Bandwidth?
The phase difference of two sinusoids is given as:
| TX --(r)--->RX <------- (Reflection)|
d: whole path from sender to reflecting object
$ \Delta \theta = 2 \pi \cdot \frac{(2d - r)-r}{c} f + \...
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Question about delayed sampled sinusoid math expression
I have been studying the digital audio processing by using the book <Designing Audio Effect Plugins in C++>.
For analog Sinusoid:
Complex Sinusoid = $e^{jωt}$
Delayed Sinusoid = $e^{jω(t−n)} = e^...
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577
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What is the relationship between group delay and propagation delay for a filter? [duplicate]
I was trying to design a filter for a system and I was able to obtain the group delay plot in matlab using grpdelay. The group delay output is in samples. However, I was not able to relate that data ...
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3
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Delay a signal in time vs in frequency
I have a signal h that I want to delay for a time t.
I know that I could use two possible approaches:
$h_{\text{delay}}[k] = \...
0
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1
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669
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How to solve a time delay from an FIR filter?
I have designed a FIR high-pass filter $\{h_n\}$ with length 257 to filter a signal $\{f_n\}$ with length 512. To convolve signal with filter in time,
I performed an FFT with length 768, padding ...
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Why can the number of zeros be no more than the number of delay elements in a signal flow network?
Let $N$ be the signal graph representation network of the system function (in rationale form) of a discrete-time LTI system. For a network $N$ with
no loops, the impulse response is no longer than ...
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186
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How to use cross-correlation to verify speech data and determine delay
I have been experimenting with cross-correlation function to verify the presence of speech in a recorded file wrt a source file. I tried the following in Matlab:
<...
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GCC-PHAT always peaks at zero when estimating delay offset
My question is that when I used gcc-phat to estimate delay between two audio signals, it always returns zero offset. However normal cross correlation Xcorr gives a good result. I don't know the reason....
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How can I find the delay between two signals? [duplicate]
I am using NARX in Matlab.
Is there any method to find the delay between input and output signals?
My aim is to decrease memory length by finding the delay.
TIA.
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Interpreting the cross correlation results
I am new to this forum. I am just trying to understand how to calculate delay (in terms of samples) between two signals using cross-correlation function. I wrote a small Matlab code in order to ...
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Is this the correct solution for finding the samples of phase delay at a given frequency of an IIR BiQuad filter?
I want to calculate the number of samples of phase delay at a given frequency of an IIR BiQuad Filter. I believe I have solved this, but I would like to confirm I have done it correctly. My work is as ...
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Delays and alignment issues: how to compute the an equalizer delay?
For example, if an equalizer model experiences a delay due to its processing, the equalizer may misinterpret the boundaries between the equalized symbols it outputs and, therefore, return meaningless ...
user47976
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339
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phase difference detection
For application of syncing sampling clock phase to carrier phase of received signal where the received signal is sampled with 10 times the carrier phase and modulated with the PSK shown in the figure (...
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Frequency-specific Delay?
So an equalizer manipulates the gain of certain frequencies by use of a variety of filters, as we all know. But is there a way to manipulate delay in a frequency-specific manner?
A parametric ...
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How to Reduce Phase Lag Caused by Kalman Filter
Background
I have been developing a system using a moving robot with a distance sensor against another robot. I want to control these robots by estimating relative velocity and acceleration derived ...
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Measurement delay versus control delay
For a typical conventional control loop (no delay, measurement transfer function is 1) the closed-loop transfer function is
$$H(s) = \frac{G_{comp}G_{process}}{1+G_{comp}G_{process}}$$
With an ...
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Quantifying the frequency shift of a delay with LP filtered feedback
I am working at a Karplus-Strong sound synthesis technique where an excitation impulse is subjected to a delay with feedback and a one pole LP filter in the feedback line. The process is simply
y[0]=(...
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Is a notch filter for 50 Hz without delay possible?
I am processing an EEG signal (2 kHz sampling frequency) from hardware and the built-in filter doesn't work as intended. FIR gives a delay, and IIR is unstable.
The signal of interest is from 4&...
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What is effect of fractional sample delay effect on FIR Filters?
In the DSP lecture slides we have this slide:
And
So why this part of FIR Type 2 and Type 4 filter impulse response equation bolded in this slide?
Thanks for your attention.
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How is time or sampling rate accounted for in this model?
A basic model of coupled strings (eg. piano) is provided here as:
The principle is that it has two identical string simulations each formed by a delay line and LPF. The outputs of these are summed at ...
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GCC-PHAT for Multiple Sound Sources
Can GCC-PHAT be used to detect multiple time-delays (that is, having multiple acoustic sources simultaneously)? The documentation for the gccphat(sig,refsig) ...
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436
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Compensate delay of non-symmetric (non-linear phase) filter
Lets assume I want to apply a matched filter h which is non-symmetric to my signal x and the output is ...
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What factors affect the propagation delay at wireless communication?
Generally, the signal propagation delay is d/c.
d is a distance between a transmitting antenna and a receiving antenna.
c is light speed.
However in NS-3, there is Random Propagation Delay Model
...
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Maximum cross-correlation coefficient value for time delay estimation
I am using cross-correlation for time delay estimation of two synchronized recordings ($x_1$ and $x_2$) of a fixed sound source from two different locations.
I understand that the delay is associated ...
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Plotting phase delay from first principles giving different result from phasedelay() function. Why?
I have a length 10 Finite Impulse response as shown below, and I am trying to find the phase delay of this FIR.
$$h[n]=\begin{cases}0.1,& 0\le n \lt 10\\
0,&\textrm{otherwise}\end{cases}$$
I ...
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Mathematical expression for a system
I have a system that delays the input with k samples and concatenates the new input with delayed one so that y = [x(n) x(n-k)] so if the input comes with n samples the output should be k+n samples. ...
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Implementing real-time variable fractional delay line in Matlab
I am attempting to implement a fractional delay line in Matlab which operates in real time, uses an object-oriented approach, and whose length can be modulated each time a sample is processed. I have ...
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Delay in Savitzky-Golay filtering
I am applying a Savitzky-Golay filter to a signal, using the scipy function.
I need to calculate the lag of the filtered signal, and how much is it behind the original signal.
Could someone shed ...
