All Questions

-1
votes
1answer
27 views

What does a fractional frequency mean/how to interpret it?

This question has bugged me for a while as it's not addressed in any books I've read. I was wondering how folks from this community interpreted it. Below are my personal notes on the matter (please ...
0
votes
0answers
10 views

Decoding .wav file to bit level data

I have been given the following waveform and asked to read the data and write to a buffer using Java. The .wav file has a sampling rate of 44100 Hz, 2 channel and 16-bit depth. From the waveform, I ...
0
votes
0answers
15 views

Audio signal similarity percentage

My problem is to find a way to classify audio files, and after that I need to test my machine with an audio file whose similarity percentage I need to find. I tried to do it using MFCCs first ...
0
votes
0answers
22 views

What kind of power spectrum implies uncorrelation in time?

I am new in signal processing field, and actually I just need some basic tools for what I am working on. I've learnt that the autocorrelation function is the inverse Fourier transform of the signal's ...
0
votes
1answer
15 views

Hilbert transform of symbolic function in Matlab

I have a signal of the form $f(\omega,x) = g(\omega) e^{i \omega (x +c)},$ for $g: [\omega_1 , \omega_2] \rightarrow C, \, x\in R$ and some constant $c.$ I want to get the function $$ F (\omega,x) = \...
0
votes
0answers
16 views

Why can the energy of local computing be written as $f^2$

I saw this formula in this book: Wireless Information and Power Transfer: Theory and Practice And in the formula $14.8$,it said: $f_{i,n}$ is the CPU frequency for the nth CPU cycle required for ...
1
vote
1answer
11 views

Separability vs. Resolution - Synonymous terms?

In terms of discrete representation of a variable, let's say time measurements in absolute values in [seconds], is there a difference between separability and resolution? When do speak of either ...
3
votes
1answer
23 views

Limiter, compressor, AGC, dynamics processor?

What are the primary differences between the usage or definitions of the terms “AGC”, “compressor”, “limiter”, and dynamics processor? They all seem to be forms of playing with gain knobs.
4
votes
1answer
404 views

Why sampling a periodic signal doesn't yield a periodic discrete signal?

I've been studying Signals and systems lately and I've came across a bullet point in a slide that claims "The uniform sampling of a periodic continuous-time signal may not be periodic!". Can someone ...
0
votes
0answers
24 views

duration for a signal

I am a beginner in the signal processing and I have questions for the duration of a signal. My system has a bandwidth $B$. I have a signal $s(t)$, the duration for this signal is $T$. The signal $s(t)...
3
votes
0answers
19 views

Efficient implementation of 2-d circularly symmetric low-pass filter

How can a two-dimensional ideal circularly symmetric low-pass filter or its approximation be efficiently implemented on data sampled on a square grid? I'm referring to an ideal filter with a spatial ...
0
votes
1answer
12 views

MRI image reconstruction - reduced scan pecentage

I have an MRI kspace from a siemens 1.5 T scanner with reduced scan percentage ( sampled truncation by not acquiring the most peripheral lines in kspace). The kspace plot in matlab look like below. I ...
1
vote
0answers
22 views

DFT equivalent circular convolution weight matrix with a symmetric filter of length 2K+1

$\DeclareMathOperator{\diag}{diag}$In a research paper, I read that: For optimization, the $n\times n$ weight matrix of DFT can be equivalent to circular convolution with a symmetric filter of length ...
1
vote
2answers
43 views

How to deal with the mirrored components of a FFT? And another question

I'm trying to simulate the behavior of my FFT spectrum analyzer, I am using Mathematica, but my questions are more conceptual than technical implementation of code...I hope. If we consider a simple ...
0
votes
0answers
15 views

How to get maxima of rho in hough table

i applyed hough transform in my image and this is the result of hough table, i must get the maxima of rho in two basic angles of theta , the one is around -65 : -60 and the other is round 30:35 How ...
0
votes
0answers
25 views

Negative Exponential Filter SciPy

I'm trying to transform a time series with a recursive filter to model a feedback. I was able to do a simple filter like : ...
0
votes
1answer
47 views

Fixed-point Exponential Moving Average filter with given cutoff frequency

I want to implement in fixed point arithmetic an exponential moving average filter, with a specific cutoff frequency for a given sampling rate. The formula for the filter is $$ y_n = \alpha x_n + (1 -...
1
vote
1answer
230 views

Bilinear Transform (Tustin's Method) applied to the Derivative

I hope that I have not misunderstood something terribly wrong, but the continuous derivative $D=d/dt$ can be considered a transfer function in Laplace space $D(s) = s$, right? So when I try to ...
0
votes
0answers
21 views

Convex Optimisation and Python [on hold]

I was tweaking with CVX Toolbar in MATLAB. While running a simple example (available on CVX Documentation), I keep getting errors. I am writing a MWE below: ...
0
votes
0answers
6 views

Pascal Voc 2012 Annotaions for 6D viewpoint(pose) estimation

Everyone, I am working on 6D pose estimation and I have to predict a rotation matrix (Euler angle) and translation. Now In Pascal Voc annotations are in the form of azimuth, elevation and distance ...
0
votes
0answers
40 views

How can I generate an IF signal of 70MHz, with a bandwidth of 1MHz, on MATLAB?

I am a beginner in MATLAB, and have a fair grip on the theoretical concepts of up conversion, etc. So the problem statement is that, a 70MHz, IF signal, of 1MHz BW is obtained from a satellite, and ...
0
votes
0answers
16 views

PulseAudio cannot read buffers at consistent rate [on hold]

I want to record my microphone and process in real time, eg. show an oscilloscope view of the microphone signal. I've tried 3 ways to get the data out of PulseAudio and they all perform the same. ...
0
votes
1answer
20 views

How to draw the magnitude plot of a variable slope low/high pass shelving filter? (eg. as a function of cascaded shelving filters)

I am interested in making a magnitude graph of a variable slope low/high pass filter. I would like to set slope in dB/oct and a cutoff pitch. The y-axis should be amplitude from 0 to 1, and the x-axis ...
0
votes
2answers
46 views

What Is the Relation Between Deblurring and Deconvolution in Computer Vision and Image Processing?

The deblurring problem can be modelled as follows $$ f = \phi u + \epsilon, \; \epsilon \sim N(0, \sigma) $$ where $\phi$ is a filter (e.g. a low-pass filter) and $\epsilon$ is a Gaussian noise. In ...
1
vote
1answer
60 views

Calculating Data Rate using Bandwidth, Transmission Power, Noise Power Spectrum Density and Channel Gain

I'm a Software Engineering student researching on Load Balancing in IoT and I need to calculate data rate. However, I don't know how to use these values to attain data rate despite searching on the ...
0
votes
0answers
26 views

Audio callback function for Windows in c++

I'm writing a cross platform c++ based audio library for an app I am creating. For the audio component I am not using any platform specific code. I have a test harness that outputs audio using device ...
0
votes
0answers
33 views

Upsampling and downsampling signals as a preprocessing step for a neural network

I have audio data acquired from a 4 channels sensors array. As a preprocessing step for a neural network, I want to beamform and focus on the sound source. For higher resolution in the beamforming ...
2
votes
1answer
66 views

Basic difference between Fourier transform and laplace transform? [duplicate]

I have read few links about difference between Fourier transform and Laplace transform but still not satisfied Please correct me if i am wrong Simply put, the main difference between Fourier ...
0
votes
1answer
31 views

Conversion from continuous to sampled signal?

I am bit confused regarding sampling as i read different types of statements in different texts Forexample i have a continous time signal $x=sin(t)$ defined for $t=0:10$ and i want to sample it with ...
-1
votes
1answer
40 views

What does this spectrogram mean?This is spectrogram of a multitone FM signal

! The spectrogram of FM signal has been generated by using Matlab.Now I want to what does these scratch like lined represent, though I have only two frequency components in my message signal(https://i....
1
vote
1answer
26 views

Extract frequency data from MP3 file

I want to do frequency analysis of audio data, basically trying to figure out what the notes are in a song algorithmically. The standard approach is to decode the MP3 into PCM data and run it through ...
1
vote
1answer
21 views

is there a use for a changing kernel in image convolution

I understand the principle of image convolution. Maybe. I think it is this: You use a small matrix with numbers in it, then take a sample of an image with as many pixels as you have numbers in your ...
1
vote
2answers
58 views

Bilinear transform with pre-warping for systems other than classical filters

I only seem to be able to find online information about applying bilinear transform + pre-warping to filters (like butterworth, etc.) with only one edge frequency that is purposely 'designed' into it. ...
1
vote
0answers
46 views

Real time signal smoothing / high pass filter

I am attempting to effectively high-pass a signal sampled in real time at 10kHz, to remove frequency components <= 1 Hz with minimal distortion (due to phase/group delay) of the signal components >...
1
vote
0answers
23 views

Relation between power spectral density and mean absolute value

The root mean square $$\sigma_{x} = \sqrt{\frac{1}{T}\int_0^T x^2(t) \, \mathrm{d}t}$$ of a finite zero-mean random signal $x(t)$ in the range $0 < t < T$ is related to the signal's power ...
0
votes
0answers
24 views

um between a random vector and a signal

I have a signal $f(t)$ with its duration is $T_f$. To have the discrete signal $f(n)$, I use a sampling frequency $f_s$. Consequently $L_f=T_f*f_s$. I have a random vector $v$ that has the same length ...
0
votes
2answers
106 views

Floating point to fixed point in C

I've been trying to make a digital filter. I've used the following transfer function to get my digital coefficients https://gyazo.com/00195ef119f0b2ff93fa5855715abdc9 Which i've then transfered to ...
0
votes
1answer
26 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 ...
-2
votes
0answers
15 views

correlation and coherence functions definition

Could anyone help me about definition of correlation and coherence function in terms brain signal. I need a plain text definition without mathematical definition.
0
votes
0answers
35 views

Absolute Value z Transform

just a quick question on how to perform z transform and provide the ROC when the sequence is: $$x[n] = 5|n|$$ Thanks!
0
votes
0answers
19 views

Remove human noise in background from audio signal [on hold]

I am new to signal processing. I have a set of audio signals which has background noise of humans talking. Is there a way to remove the human voice and save the new audio signal. Can i get the code if ...
-1
votes
0answers
21 views

Signal to noise ratio in python [on hold]

How do I compute Signal to noise ratio on Python ? After some research in Google, I found a deprecated function signaltonoise on scipy.stats package.
0
votes
0answers
12 views

What is a transmission rate of 802.11a WIFI radio?

I am trying to understand the transmission rate at which a WiFi radio sends its packets to other radios ? Like in DSRC (which is 802.11p system) , DSRC Radio broadcasts its message 10 times a second ...
0
votes
0answers
19 views

The mean value of phase noise as a stochastic process

What is the mean value of phase noise as a stochastic process? Where can I get a theoretical analysis of this topic? PS: PLL produces cos(2*πfct+φ(t)). The phase noise refers to φ(t). The mean value ...
0
votes
1answer
9 views

Defining the observation matrix for a Linear Kalman Filter

So I'm working on some content for an exam tomorrow and have hit a logical snag. The question can be seen below: In particular I am referring to 5)c). The questions asks for a measurement model to ...
0
votes
0answers
34 views

How to quantize an Audio Signal?

I have generate a .wav-File with a sample rate of 44100 and a 1Khz Sinus Signal, I want to generate a PDM-Signal from the wav-File for later Neuronal Network processing. I know want to quantize the ...
1
vote
1answer
24 views

Why entropy value can be used as measure of contrast of an image?

I was looking for value that can measure a contrast of an image. And I found a couple of answers like this one https://stackoverflow.com/questions/13397394/how-to-measure-contrast-in-opencv-visual-c/...
1
vote
0answers
18 views

How exactly does one apply a Hanning Window for a spectral estimate?

PREAMBLE I am a graduate student researching evolutionary ecology. My supervisor and I have been trying to learn how to simulate colored noise, discretely, by the $\frac{1}{f^\alpha}$ power law for $\...
0
votes
0answers
21 views

Notch Filter with given Bandwidth

I have to use Matlab with the iirnotch()-function to design a notch filter. The notch should sit at 520Hz, the Bandwidth should be 100Hz and I have a sampling ...
0
votes
0answers
19 views

Time gating of FFT for audio Measurements or Multi Time Windowing

I am learning more about DSP specifically for audio measurement purposes. I can an app, where I can create a log sine sweep from start frequency to end frequency over a certain length. I can perform ...

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