instruction stringlengths 31 27k |
|---|
Here I motivate the question by deriving FFT upsampling for $N \rightarrow 2N$ with even $N$.
One might naively try xup = 2*ifft([xf[:N//2], zeros(N), xf[-N//2:]]), but as we'll see, Nyquist requires special treatment, and in fact exact upsampling (recovery) is impossible, but there's an acceptable alternative.
Suppose... |
I have a system which has the following transfer function
$$H(s)=\frac{\beta + s}{s^{2} + 2\alpha s + \beta^{2}}$$
where $\beta = \sqrt{\omega^{2} + \alpha^{2}}$ and $\alpha>0$.
This system, as already discussed in a dsp question is stable. How can I check the other two properties?
EDIT
If a random (wide-sense stationa... |
How is pitch related to frequency.? If there is a pitch for a fundamental frequency, will that pitch be same for harmonics?
|
I'm new to Software Defined Radios and trying to find out if powerful signals are a cause of my own interference, a poor setup, or just a lot of traffic. I'm using a HackRF One with an ANT500 antenna.
I'm trying to listen in on AM Aircraft radios using SDRAngel or SDR++, which are somewhere between 113MHz to 300MHz.
My... |
In $$e^{j\pi/\gamma x}=c$$ if $x$ and $c$ are known, how to find $\gamma$ since if we break to sine and cosine term the problem becomes more complicated. This is a complex value and $j$ indicates complex value.
|
It is approximately 30 years since I last studied signal processing, but have lately encountered a problem for which I am confident the solution is well-known in the signal-processing world. I hope you can help.
I am analysing a signal $q(x)$ in an interval $x \in [a,b]$ which may in some circumstances be little more ... |
What is the proper way to calculate the Es/N0 of demodulated and equalized symbols in simulation for BPSK and QPSK? I have seen various examples that include
calculating the standard deviation of the received symbols,
calculating the square of the absolute value, and
incorporating the energy of the transmitted symbols... |
I am studying filters and I am not able to find a reason why ripples appear in the passband of chebeshev filter. I know it has a high roll off and the ripples are due to high order but In Butterworth and Bessel high order filters we don't have ripples in their passband so where does those ripples come in the pass band ... |
I have a vector $x$ with size $N \times 1$, it's multiplied with a $Z$ matrix $N \times N$, the resulted $N \times 1$ vector is $y = Zx$. I know that each value of $y_i$, where $i = 0, 1, 2, .., N-1$ is as follows:
$y_i = \frac{1}{\sqrt{2}}\left [ x_i \mathrm{cos} \left ( \frac{\pi i}{N} \right ) + x_{N-i} \mathrm{sin}... |
Say I have nRF52840 with 1 MB flash and cortex m4. Assume that I have a vector of $10^5$ int16 samples on which I would like to implement an RFFT. Now, Cimsis-DSP has an implementation for real fft, which for Q1.15 take a maximum input length of 4096. Is there a method to run the full, $10^5$, FFT length?
|
For QAM modulations how to obtain the bitrates with the used channel spacing, i have been searching but mathematically couldn`t find an equation that gives me the exact bitrate
for example how to find the following bitrates for CS 28MHZ: ???
4QAM : 44MBps
16QAM : 87MBps
32QAM : 109Mbps
these bitrates are for standa... |
There are instances when neural networks, after being trained continually on a subset of data, tend to drastically lose their performance. I've attached an image below depicting the same. I am looking for an algorithm to detect this sudden fall in performance.
I'm quite new to this area and therefore don't have any id... |
Question for those familiar with adaptive beamforming: Why is the null formed by an adaptive beamformer much narrower than the beamwidth of the antenna array?
Concrete Example
Suppose we have a simple uniform linear array (ULA). We can combine the array elements to get the beampattern by beamforming. This pattern will ... |
I have an RTL-SDR dongle which is tuned to a carrier frequency in my area which corresponds to a P25 radio channel (506.7375MHz).
Using MATLAB's SDRRTLReceiver function, I sample the signal at 240KHz and collect 1 second worth of signal.
I can see the signal on the spectrum analyzer when the radio channel is active:
A... |
I've been attempting to stabilise an unstable filter (unfortunately, I cannot redesign the filter in a way that it is more stable and that is NOT an option). It is derived from an approximation of actual physical components, which I know very little about, and certain fixed values for those are used to obtain a LaPlace... |
I'm trying to implement speaker diarization (who speaks when) for mono recording audio (1 channel), but now I'm starting to work with multichannel audio (stereo - 2 channels), so I need for data augmentation to use multichannel spatially diffuse noise, I'm new to this.
Do I have to use impulse response, maybe multichan... |
I am coming from a background in deep learning techniques for computer vision like image classification, action recognition from skeletal data, and semantic segmentation. I have read several papers on Optical Flow, but I'm wondering what the nature of the annotation is for optical flow.
Specifically, supposing we have ... |
I'm trying to figure out how to perform N'-band channelizer for SSCA (strip spectral correlation analyzer) via sliding FFT. I understand that I have to take $N$ points of signal in time domain $x(t)$, apply a windowing function and take another $N$ points by shifting the window by $L$ ($L=1$ in my case). Then I apply F... |
Before quantization of filter coefficient, it behaves well, but after quantization the amplitude drops to 0.52186, which is expected to be 1000(fig.1). But according to the amplitude response in filterDesigner(fig.2). The 200Hz wave shouldn't decrease so much after filtering. Could someone tell me why the abnormal atte... |
I followed the two methodology for generating impulse response
Method 1: Used the below link reference where I simply convolve the recorded signal by the time reversed sweep signal to get the impulse response.
(Estimating the Impulse Response of the Room Using Sweep Signal Microphone Recorded Signal (Input & Output of ... |
A standard IoT device might include a sensor, analog to digital convertor, and processing unit. All of those components could be integrated into one system on a chip. What are the alternatives to creating such a system? I may think of an analog circuit approximating the DSP process implemented by the chip, FPGA, etc. M... |
I just read this article on decimation filters. In particular, in section 2.3.3 it is strongly suggested that FIR filters are advantageous, because you only need to calculate every $M$th sample, where $M$ is the decimation factor.
So in the case of the FIR, for each decimated sample you have to perform approximately $M... |
I'm implementing digital Butterworth filter and encounter some numerical problem when filter order is high using direct form, so I wonder how to design the digital Butterworth filter and return its zeros, poles and gain directly, then I can convert zeros and poles to second-order sections. I tried to write a root-findi... |
Currently, I am trying to split a buffered audio signal (buffer size = 1024 samples) into several bands in order to output a bunch of numeric values of their levels (calculated as RMS values). So far, I have the following code:
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#define BUFFE... |
In the materials about image resampling, it always mentions that real-world digital images not bandlimited. However no explanation
is provided.
For example,
Sinc resampling in theory provides the best possible reconstruction for a perfectly bandlimited signal. In practice, the assumptions behind sinc
resampling are no... |
I understand that it is an odd question, and this is arguably not the ideal forum, but I am at a loss.
Some of you may be familiar with DICOM as a consensus or standard format for medical image transmission and storage. It includes a lot of meta-data regarding technical aspects of in this case MRI.
One of the values is... |
I am working on segmenting the platter from hard disks at various angles (my data set comprises ~250 grayscale images and I would need this to work for each of those). I've attempted using the hough transform to detect this (it operates on the edge image) -->MATLAB code and related blog post linked here:
Ellipse detec... |
I have a system model as shown in figure 1. I want to change the model to a new schematic as in figure 2. How to analytically derive the filter $H_2$ if all parameters are known?
I guess that we will face the difficulty of exchange between convolution and multiplication operation whether in time or in frequency domain... |
I think I understand how the DFT can be seen as a bank of bandpass filters. I am trying to understand the IDFT within the same framework. I understand that the IDFT can be seen as summing linear combinations of the complex exponential basis vectors with the coordinates of a signal on that basis but I'd like to understa... |
We usually zero-padding into the moulated data of OFDM before performing IFFT operation to make the design of anti aliasing filters easier ( the cut off can be less sharp) hence save cost. That operation is done by padding zeros at the middle of the data before the IFFT operation.
Can I do the same operation in time do... |
I understand the theory of Distributed Arithmetic and its application in FIR Filter implementation to avoid the excessive power consumption in the multiplication operations
But a question here, when I try to solve it numerically in a paper, it gets a correct answer when I do the following:
let $j=0$ LSB and $j=5$ MSB;
... |
I'm trying to recreate an effect used on photoshop called satin effect, which has an option that control the size of the satin, which I think it's just a special blur applied to the satin pattern
So here's an example of the satin pattern of two shapes (apple and rectangle) (with a size of 0) :
Increasing the size of ... |
I am trying to implement a text dependent speaker verification system. Here each speaker will speak their unique identification number and they will be granted access. I am trying to implement this using MFCC features and Vector Quantization. Till now the system is performing good.
However, the system has become text-i... |
I have some signals in csv taken from an accelerometer. These come from vibration data of gearboxes.
With scipy I can easily get its frequency (in terms of acceleration) by applying the RFFT to the oscillogram (I am also using a Hanning Window)
And by dividing each magnitude point by it corresponding omega (Hz*2Pi) I... |
I have two sequences $s$ and $r$ defined as :
$s = \{s_n\}_{n \in \mathbb{Z}}$ where $s_n(t) = (M_{\beta}^n s)(t) = s(t) e^{int}$ with arbitrary $s \in L^2(\mathbb{R})$ and $\beta > 0$
$r = \{r_n\}_{n \in \mathbb{Z}}$ where $r_n(t) = (M_{\alpha}^n r)(t) = r(t) e^{int}$ with arbitrary $r \in L^2(\mathbb{R})$ and $\alph... |
Is there a recommended filter type for frequency bands near the Nyquist frequency?
I have been trying to design complex passband filter with passband $[0.8 ~~1]$ ( where $1$ corresponds to the normalized Nyquist frequency) and stopband $[-1 ~~0.7]$. Using an equiripple filter of order 30 under Matlab,
f = [-1 -0.9 -0.8... |
I have some general observations but I am asking if anyone can summarize more conclusively:
(1) Filter settles slower if the ratio between signal frequency and filter cutoff frequency is smaller;
(2) Filter settles slower if bandwidth of a band-pass filter is narrower:
(3) Filter settles instantly when applying on an u... |
I have a question related to CSI-RS channel estimation.
Let us assume that the base station has 64 antennas and we decide to use 32 antenna ports for CSI-RS transmission. Also, UE has 4 antennas.
My understanding is that UE can estimate 32 x 4 channel, not 64 x 4 channel, and reports a PMI that maps the number of layer... |
I am trying to find the correlation of audio frequency data resulting from an FFT with itself. It would be interesting to hear what you all think on the following question :
Should one use the complex data from each bin to calculate autocorrelation through a sliding dot product, or should one use the real magnitude of ... |
This paper introduced a fast method for computing the real CWT and achieved $O(N)$ complexity per scale.
However, in the context of this article, I'm not sure what the definition of oblique projection is. This paper (Section II) said that there are two subspaces, i.e. (1) a space $V(\phi_2)$ defined by the integer shif... |
I usually see books/references writing the complexity of such operations as $O(N \times \mathrm{log}_2(N))$; For example, the complexity of FFT/IFFT operation is $O(N \times \mathrm{log}_2(N))$. However, that operations requires approximately $5N \mathrm{log}_2(N)$ real operations (real additions + real multiplications... |
tl;dr I'm looking for something like Scipy's decimate function, but one that takes in a generator, rather than a Numpy array.
I am turning on and off a light using a pseudo-random sequence of 0s and 1s, something like:
instructions = [0, 1, 1, 0, 1, 0, 1, 1, 1…]
Each 0 or 1 corresponds to ideally 50 milliseconds. The ... |
Not sure I'm in the right StackExchange group for this question, but it seems linked enough. Let me know if it's not the case.
I heard about an acoustic and/or signal processing technique that allows small speakers to kind of fake low bass sound waves, and that would allegedly be used by most good quality bluetooth spe... |
I am new to signal processing and I am sure this is a very rudimentary question. However I have done various searches and I cannot find an explanation (possibly because my knowledge is insufficient to even ask the question).
I have a light intensity signal, which is sampled at 2hz. I would like to apply 0.1hz lowpass f... |
I am going to detect alarm sounds (like from a fire detector) in a live stream. (I have asked similar questions here before, I'm now at the stage of actually doing it).
I will not really want to compare that two audio segments are similar (as in How do I implement cross-correlation to prove two audio files are similar?... |
I have a function that's sampled relatively coarsely along one direction, $x$, and much more finely along another, $y$. Sampling grid is regular. I need to interpolate between all these samples, with the following requirements:
Computation of the interpolated function must be $O(1)$ with respect to data resolution (it... |
I have this channel impulse response. $h = [1,\,0.5,\,0.3+0.3j]$
The channel is like this by doing a FFT for h.
I resample (up-sample) my OFDM symbol to have smaller path delays and convolve it with my channel impulse response h. In the receiver side I estimate channel with my pilots and everything is Ok.
when I want ... |
Let's say I'm listening to an AM radio station in the United States at 680 kHz. From my understanding that means there's a carrier wave at 680 kHz and the bandwidth for the station goes from 675 kHz to 685 kHz.
When I move the tuner of my SDR in 1 kHz increments, the AM audio doesn't sound any different until the carri... |
Context and objective
I am trying to estimate the attenuation coefficients ($\alpha_u$ and $\alpha_v$) of two waves ($\overrightarrow{u}$ and $\overrightarrow{v}$). These waves propagate on a linear antenna of $N$ sensors, noted hereafter $\overrightarrow{s}_{i=1, ..., N}$, equally spaced at a distance $\Delta_x$. For ... |
The kernel of a sharpening filter of size 3x3 may look like
$$
\frac{1}{4}\begin{bmatrix}
0 & 1 - \alpha & 0\\
1 - \alpha & 4\alpha& 1 - \alpha\\
0 & 1 - \alpha & 0
\end{bmatrix}
$$
where $\alpha > 1$
What is a natural extension for size $(2n + 1)\times(2n + 1)$?
The sum of all elements should be equal to 1, and the m... |
I have an FPGA that's streaming in samples from a high speed ADC. The FPGA clock rate cannot run at the sample rate, so the samples are streamed in parallel (4 samples per clock cycle).
I'd like to design a polyphase decimation filter to split the input spectrum into 4 downsampled subbands, with an effective rate of fs... |
Following on from my previous question, kindly answered by @peter-k, I have a related one...
I have, in a small interval $a \leq x \leq b$, a function $q(x) := q(x;\rho,\gamma)$ whose exact form is unknown. However, a Taylor expansion around a point $x=\rho_0$ shows that, to the first order, we have
$$
q(x;\rho_0,\gam... |
I am working with some time series data with a shape of 8064. The data is actually the popular EEG data called DEAP. It basically is a 3D array of size (40, 40, 8064) and here is the link to the official dataset website: https://www.eecs.qmul.ac.uk/mmv/datasets/deap/
I applied Welch in order to get the PSD (Power Spect... |
Based on the numbers, can anyone tell me what Sensitivity means in VCO block.
This is what I found so far, but do not understand it.
Sensitivity
units are radians/sec/(input unit)
|
Can we perform signal processing and image processing using default pyhton IDLE(that is downloaded from pyhton website) for scenarios where we may also need plotting etc? or is it necesssary to install some other advanced IDE like anaconda or pycharm etc?
|
Let $X_i$ ($i=1,\ldots,N$) be random variables describing an unknown constant signal $S$ and a noise $n_i$.
$$X_i = \mu_i S + n_i$$
In this question what does "$\mu$" stand for? Also, can I say that $X$'s distribution is Normal with expectation of "$\mu S$" and SD of "$\sigma$"?
Full page below:
|
I would like to create a discriminator of an FSK signal in order to demodulate it.
I only have the real part of the signal and it is centered in zero frequency (baseband)
My main problem is that I am not able to make the arctan of this signal because it is real. I am in a symetry issue using cos-1 or sin-1.
Do you have... |
I have a rough understanding of DFT/FFT.
By definition:
$$
X_{k}=\sum_{n=0}^{N-1} x_{n} \cdot e^{-\frac{i 2 \pi}{N} k n}
$$
To me , DFT/FFT works like correlating the signal $x_{n}$ and a signal with known frequency($e^{-\frac{i 2 \pi}{N} k n}$) and finding how similar they are.
Why don't we correlate $x_{n}$ with sig... |
If you have a discrete signal, say
[1,0,0,1]
and you convolve it linearly with itself, you will quickly get a Gaussian distribution.
Why does it not hold for circular convolution?
|
I'm trying to implement an algorithm for Convolutional Blind Source Separation (CBSS) based on the ALS algorithm for common BSS on this paper.
On this paper, the problem is formulated by (noise suppressed):
$$\boldsymbol Y=\boldsymbol{AS}$$
which $\boldsymbol A$ and $\boldsymbol S$ must be estimated. The function to be... |
May I know how to derive the BER formula for chirp spread spectrum BPSK modulation scheme ?
|
I am not a signal processor but need to use Cepstrums in a bigger project I am writing to help identify echoes in seismic signals.
I need to understand why the Real and Complex Cepstrums I create, in Python, have the right hand side of the output being the mirror image of the left hand side. I get a similar result when... |
I worked on some medical image processing research two decades ago and I used ImageJ then. I started to pick up some medical image processing projects again (some registration and segmentation). I checked out Fiji, which seems to be a successor of ImageJ. But the project does not seem to be very active anymore. I wonde... |
I would like to design a complex and causal allpass filter with delay of $\pi/2$, but only for negative frequencies. The positive frequencies should have a delay of 0. Is that possible and how I should go about that?
|
Consider the following discrete-time system:
\begin{equation}
\mathbf{x}(k+1) =
\mathbf{A}_d
\mathbf{x}(k)
+
\mathbf{B}_d
\mathbf{u}(k)
\end{equation}
\begin{equation}
y(k) =
\mathbf{C}_d
\mathbf{x}(k)
+
D_d
\mathbf{u}(k)
+v(k)
\end{equation}
Where $\mathbf{A}_d = \begin{bmatrix}1 & dt\\0 & 1\end{bmatrix}$, $\mathbf{B}... |
I am working with a data which is actually the popular EEG data called DEAP. It basically is a 3D array of size (40, 40, 8064) and here is the link to the official dataset website: https://www.eecs.qmul.ac.uk/mmv/datasets/deap/
I am planning to extract the differential entropy (DE) of it but I am having difficulty impl... |
The difference between convolution and cross-correlation from a signal-analysis point of view
The above question gives very good information from signal processing point of view. But what about images?How we can differentiate between convolution and correlation from image processing point of view ?since in my understa... |
My $H_0$ hypothesis is that the N signals I've collected are just white random noise, i.e.:
$H_0: d(t) = n(t)$
I'm then asked to formulate the $\chi^2$ test for this. But according to the formula
$\chi^2 = \sum (O-E)^2/E$
But doesn't that mean, that the expected value going to be 0 for white noise normal distribution, ... |
I have the following function.
$$ x(k) = \sum_{m} e^{i (U_m k + \beta_m)} $$
$i = \sqrt{-1}$
Here, $U_m$ are samples drawn from a Gaussian random distribution.
$$ U_m \sim \mathcal{N}(\mu, \sigma) $$ and $\beta_i$ are samples drawn from an uniform distribution.
$$ \beta_m \sim \mathcal{U}[-\pi, +\pi] $$.
I want to find... |
Currently, I am learning gradient vector flow. I have one question about the calculation.
After Euler equations, the GVF can be found by solving the following formula:
Then, the paper said: "Equations (8) and (9) can be solved numerically by treating u and v as a function of time." The resulting equations are
I have ... |
I'm trying to design digital Butterworth filter from scratch. First I use butterap to design an analog prototype to get zeros, poles and gain
[za, pa, ka] = buttap(n);
Here I set n = 5 for example and then convert it to transfer function to check its frequency response
[b, a] = zp2tf(za, pa, ka);
freqs(b, a);
From t... |
I saw a piece of code on github which transforms the planetary movement into the Fourier wave function.
These circles are given by the $x$ and $y$ ordinates: $x=\cos (\omega t)$, $y=\sin (\omega t)$, which are periodic. To help us see this question more clearly, we can imagine it as a series of signals with different f... |
Suppose my ULA(Uniform Linear Array) is along x-axis only, then definitely we can estimate elevation angle with this ULA. But if we lift this array from x-axis and place it along y-axis, then which angle can we estimate now with this array? I think in that case, we can estimate azimuth angle instead of elevation angle.... |
When processing audio with DFT, a common strategy is to keep a buffer of many samples (maybe 8192) which is continuously updated, but compute the DFT of this buffer more quickly (say every 1024 samples). The idea being that you can get higher frequency resolution, but still get new data at a rapid rate. However, this h... |
I am new to FMCW radar and I am using a TI module. I have been reading the TI reference material and they keep mentioning the parameter "ADC Sampling Rate". I am confused by what this means in terms of number of ADC samples, chirp length, sampling rate, and other chirp parameters. This picture shows the sensor configur... |
EARFCN 3302 means 2675.20 MHz
EARFCN 3303 means 2675.30 MHz
What about 2675.25 MHz?
Why don't we have values defined for decimals with two places.
|
I have a rectangle in the 3D scene, which I know its width and height. It is placed in the 3D scene like the image below. I can manually select all points on the rectangle by mouse click.
Given the manually selected points, I want to find the location of the four corners of this rectangle. I have some ideas. However, t... |
It seems both names are used for the same algorithm:
least mean square - mainly literature before 1990, for example: Widrow, Bernard, and Samuel D. Stearns. "Adaptive signal processing prentice-hall." Englewood Cliffs, NJ (1985).
least mean squares - newer papers / popular posts, for example: wikipedia
What is the corr... |
I'm experimenting with the Hilbert transform in Python and just now understanding how potentially severe the edge effects are. Here is the code I'm using:
import numpy as np
import scipy.signal
import matplotlib.pyplot as plt
option = 1
if option == 1:
x = np.sin(np.arange(100))
elif option == 2:
x = np.sin... |
I'm trying to analyze and extract some frequency domain features for a simple machine learning model from EEG signals.
I partitioned my data to 30s epochs and used np.fft to get the frequency and the (power/amplitude?) and for each frequency I categorized it to bands of Alpha/Beta/Delta/Theta. Finally for each epoch I ... |
I used python to convert the time-domain signal below into a frequency spectrum so that I can analyze the harmonics. To do this I used Python libraries, specifically numpy and called fft to get the spectrum. I now want to validate my results. I have x, y coordinates in Excel and the plot below. To validate, I know that... |
Is there a mathematical model which provides relationship between the Signal to Noise Ratio in radar measurements and velocity/range of targets. i.e.
How SNR varies with the speed of targets?
How SNR varies with speed of the radar?
How SNR varies range of target?
Is the SNR very low when the target and the radar, bot... |
Now I have a signal $f(k)$ with $k=0,1,\ldots, N-1$, and $f(k)=0$ if $k<0$ or $k>N-1$, that is, the signal satisfies the zero boundary condition. Then by convolving this signal with a symmetric FIR filter $b^3(k)$, I have
$$
f_0(k) = (f*b^3)(k),
$$
in which $b^3(k)$ equals to $1/6$, $4/6$, $1/6$, for $k=-1$, $0$, $1$, ... |
Say I have an 8-bit ADC and I oversample at such a rate as to obtain 2 additional bits. So, before I apply the low-pass filter, I need to append two extra bits to the 8-bit signal of the ADC. Do I append 00 or 10? Does it make any difference?
|
Quasi-colocation is a concept stated in 5G NR specifications. But I'm not quite sure about what it actually means. Is one of its meanings that the propagation channel of the physical channel has the same correlation in frequency domain or time domain with that of some reference signal? How to prove this mathematically?... |
MATLAB's bilinear performs the following steps for a system in zero-pole-gain form
If fp is present, it prewarps:
fp = 2*pi*fp;
fs = fp/tan(fp/fs/2)
otherwise, fs = 2*fs.
It strips any zeros at $±∞$ using
z = z(finite(z));
It transforms the zeros, poles, and gain using
pd = (1+p/fs)./(1-p/fs); % Do bilinear ... |
I use usrp x300 SDR.
I'm confused about Bandwidth and sample_rate. How do I calculate
them? is sample_rate = Bandwidth?
|
I have some experience in Signal processing and a lot more in solving numerically the electromagnetic field integral equations using Matlab and C++.
Now I am curious about the Sonar (e.g., underwater) and wanted to give a solid introduction to this field and write some Matlab/C++ code to understand the concepts.
Any re... |
does anyone understand how to use the pocketfft by martin reinecke?
Link: https://gitlab.mpcdf.mpg.de/mtr/pocketfft
Basically it's just this snipped of code:
rfft_forward(rfft_plan plan, double c[], double fct);
I understood,
that the plan needs to be created to the "internal" planning of the algorithm,
the array c[]... |
I'm creating a comb filter bank as part of a project I'm working on, and I need a way to visualize its magnitude response. The project already has FFT-based analyzers that can generate this response, but I'm looking for ways to increase efficiency. I've had great success using the transfer functions of comb filters as ... |
I am using a Radar Sensor. So applying Signal Processing on the Radar Sensor Data. PrevSample and PastSample are Radar IQ samples for a present and previous Sweep detecting tiny movement. In the source code I have some doubts that . Here I am adding the portion of Python Code . Can anyone please explain the following ... |
Given that the pitch harmonics of speech, are higher frequency features than the spectral envelope (of the pitch harmonics), I had an idea that computing the DCT of a spectrogram and discarding the higher frequency coefficients may achieve the result of retaining features of the envelope while discarding features of th... |
The following excerpt is taken from the textbook "Digital Processing of Synthetic Aperture Radar" by Ian G. Cumming
The Principle of Stationary Phase (POSP) can be briefly explained as follows. The phase of the signal is "stationary" at some time, ts, when the derivative of the phase is zero. In this case, the station... |
The following figures are data from sampling the DC bus of an inverter for a BLDC/PMSM drive running a speed-loop with FOC.
The upper subplots are FFT's of the signal and the lower subplots are of the signal.
The signal is measured in two system states: one where the inverter is inactive, and one where the motor drive ... |
I'm trying to solve an exercise where I need to derive the MLE of the phase parameter.
I'm given the below signal with white noise $w[n] \sim \mathcal{N}(0, \sigma^2) $, amplitude $A$, angular frequency $\omega \notin \{0, \pi\}$, $N$ measurements and unknown phase $\phi$.
$$
x[n]=A \cos (\omega n+\phi)+w[n], \; \; n= ... |
I'm trying to replicate a method in a paper where the relative RMS level "was fixed to be +6dB more intense" than another sound. Unfortunately, the Python library I'm doing this processing in uses dbFS, and setting a gain of 6 barely makes a difference to the percieved loudness. Is there a method to switch between rela... |
I'm not too experienced in signal processing, so I apologise in advance if I get some of the basics wrong.
I have some data (human behaviour) collected over multiple months. The data is sampled non-uniformly, with intervals between individual datapoints ranging between milliseconds to hours. Also, there is no data avai... |
I have a series of intensity images generated by varying different scatterer geometries. An example of variation observed by varying the aspect ratio of these geometries is shown below in the three images. The intensity values currently are normalized.
My aim is to quantitatively link the image features to the aspect r... |
In my company, we are using a GNURadio script with a PlutoSDR to receive packets coming from a transmitter located very far away. The receive power is really weak, our antenna is receiving something that is below -140 dBm.
We tried to replace the PlutoSDR with a USRP N310 because it has better performances.
We found ou... |
I was reading about Finite Impulse Response (FIR) and I read that it can remove the bias (offset) from signals, but I didn't understand how this can be achieved. Can you please help me to understand the idea behind this?
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.