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0
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0answers
11 views

Noise removal of an audio signal (.wav) using matlab [on hold]

I was given an audio file containing noise. It's required to find the noise frequency components and then remove them. Finally play the noise free audio signal. Here's what I did so far: ...
0
votes
1answer
25 views

Confusion with regards to units in Sinc pulse

I am currently reading a section in the Handbook for MRI Pulse Sequence book where it says that the time-bandwidth product for a SINC pulse is given by: $$ T \Delta f = Z $$ where $T$ is the length ...
0
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0answers
30 views

Practical diversity combining at receivers (Maximal Ratio Combining & Equal Gain Combining)

I am trying to perform practical diversity combining implemented in GNU Radio by using Ettus N210 USRPs, one as a transmitter and two as receivers. To compare Equal Gain Combining (EGC) and Maximal ...
0
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0answers
25 views

How to calculate transmission capacity of a channel with multiple frequencies? [duplicate]

So I have the following question: If a transmission channel uses an analog carrier wave that is modulated by eight amplitudes and sixteen frequencies per bit time, then what is the ...
5
votes
4answers
88 views

Acoustic Scenarios With Negative SNR

For all the practicing engineers out there: Where have you encountered a negative SNR? How negative, in dB, was it or estimated to be? Where would you expect to encounter a negative SNR? Note: ...
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0answers
16 views

Plotting band-pass filtered signal of an audio in MATLAB [closed]

I am new in MATLAB and try to plot some form of an audio file and I have managed to open and plot in time domain and FFT using the following code: Step I: Opening the Wave File ...
0
votes
1answer
53 views

When does the convolution of $2$ signals equals zero?

For example, how can I determine if the convolution of $x(t)$ with $y(t)$ is equal to $0$?
1
vote
0answers
24 views

How do I find amplitude modulation effects in natural signals

It is relatively easy to discover overlaid (additive) signals in natural phenomena using wavelet decomposition, Fourier Transforms, CEEMD, etc, because addition in the time domain is the same as ...
0
votes
1answer
57 views

Plotting Power Spectrum (Matlab)

I want to make a plot of the power spectrum for a .wav sound file, over the frequency range from -2000 to 2000 Hz. Attempt: I used the following code, but the resulting plot is one sided. It doesn't ...
1
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2answers
33 views

Generating very short signals

So I need to program (using Java) some things that include generated sounds. I am struggling to understand how to make it work because I require a rather short signal while still using a sampling rate ...
0
votes
2answers
60 views

Filter Design in Matlab

I want to design a filter to remove all frequency components from a .wav file except those within $\pm 25\,\text{Hz}$ of $523\,\text{Hz}$ as well as its harmonics (up to the Nyquist frequency). ...
0
votes
2answers
33 views

A question about the concept of the time

$\delta[n+1]$ equals to one only $n+1 = 0$ ? If the 1. is true, so what does a signal $x[n+1] $ stand for? Is this signal causal or anticausal? I mean, if 1. is true, $n = -1$, so is this signal ...
0
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0answers
18 views

Plotting Filter Transfer Function (Matlab) [closed]

I want to plot the absolute value and the argument for the following transfer function around $\nu = 400 \ Hz$. The filter has impulse response: $ h(t)=50 u(t) \exp(-10t) \sin(2 \pi 440t).$ (The ...
0
votes
1answer
25 views

Proving conditions for controllability

Let's say I have the following LTI system: $$\dot{x}(t) = \mathbf{A} x(t) + \mathbf{B} u(t)$$ I need to somehow show the following is true or false (proof): This system is controllable if and only ...
3
votes
1answer
32 views

what are the Pros and Cons of ESPRIT and MUSIC algorythms?

On wikipedia there are only 2 lines about ESPRIT: Estimation of signal parameters via rotational invariant techniques (ESPRIT)... MUSIC doesnt have an entry in the music disambiguation page, other ...
0
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2answers
45 views

What is the difference between a'mixer' and a ' multiplier' used in modulation process?

I am not sure if it is valid to conclude that a mixer produces a difference/sum of frequencies at output ,while multiplier produces multiples of frequency at its output. I am keen to know how far I ...
4
votes
1answer
60 views

Random sampling vs uniform sampling

In this paper of Lustig, he speaks about a something which appears unintuitive: sampling at random may exhibit better performance than sampling uniformly. I tried to understand this starting from page ...
0
votes
0answers
22 views

What would be a quick way to set up a resonance experiment using python? [closed]

I have done research on resonance and resonators and, for fun, I would like to build an experiment to test if I can predict the resonant frequencies of a few bottles. The major issue that I'm running ...
0
votes
1answer
18 views

The signal in MRI

I am trying to understand the signal formation in MRI and have a confusion. I understand that in the presence of the external magnetic field $B0$, the protons are precessing at the frequency given by ...
0
votes
2answers
43 views

Power of a speech signal

I have been asked to calculate the power of a speech signal given by the following: $$\ p(x)= \left(\frac a2\right)e^{-a\mid x \mid}$$ I know the formula for the power of a signal to be the ...
0
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0answers
30 views

how to deal with spiky signals?

I have few spiky signals and I'm struggling to deal with them. Here a sample: signal sample As you can see there is base amplitude do not change with the time elapsed. For this reason I believe the ...
0
votes
1answer
23 views

Periodogram frequencies not matching with signals

I am new to signal processing world. I am working on a project where we have to find change points using spectral densities. I am running some simulations where in I created a wave which is a linear ...
0
votes
2answers
44 views

Accessing maximum value from singular value decomposed matrix

I have read few image enhancement papers, where an image is enhanced in transformed domain using either DCT or DWT with SVD. Few of such works can be studied from link_1,link_2, link_3 . In these ...
2
votes
2answers
39 views

detect to rising, stable and falling point in non-smooth rectangular wave

I am working on basic signal processing problems in MATLAB. I have found a signal from the internet (i don't remember the site exactly). The data is organized in column wise. 1st and 2nd column is ...
0
votes
1answer
33 views

Showing a system is always controllable?

I need to show that the following system is always controllable: \begin{align}A &= \begin{bmatrix} -\alpha_1I_{k\times k}& -\alpha_2I_{k\times k}& \cdots &-\alpha_{n-1}I_{k\times ...
0
votes
1answer
40 views

detection of similar segments of two signal

I have two signals, the first is a reference signal from which I selected a segment. I'm trying to find which segment of the other signal is the most similar to this selected segment. I'd be glad ...
0
votes
2answers
33 views

Wavelet filter coefficients from scaling filter coefficients

I am trying to develop a new type of wavelets and I found out a function that following a particular two scale relation. The function at a scale $t$ say $x(t)$ can be related in a finer scale $x(2t)$ ...
0
votes
2answers
40 views

Pre-emphasis filter design

I am using the standard MATLAB filter function to design pre-emphasis filter. However, I am getting the wrong results back! I have the ground truth so I can check ...
3
votes
2answers
153 views

Special case: Band-limited in time domain and band-limited in frequency domain

I know except for some special cases, aliasing is unavoidable. Assume we time-limit a function, $f(t)$, so that it is zero outside an interval say $[0,T]$ to form $y(t)$. Then, in the frequency ...
0
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0answers
40 views

Choosing correct filter parameters for IMU sensor datas

I have a IMU sensor breakoutboard using ITG3701, LSM303D LinkProduct. This involves accelerometer, gyroscope and magnetometer. I have connected the sensors to a Arduino and sending the datas to ...
0
votes
1answer
45 views

What is the absolute phase and the relative phase, of a signal?

I need to know what is the absolute phase and the relative phase, of a signal? and why these phases are important in the signal processing?
1
vote
1answer
33 views

Why Fourier transform and Stockwell-transform retain the absolute phase information of one signal?

Hello friends am studying the topic of signal processing and the Fourier transform and the s-transform and in most books as for example "Time-Frequency Signal Analysis and Processing. 2nd" of Boashash ...
0
votes
1answer
23 views

Autocorrelation of a noisy linear map

I am interested in calculating the autocorrelation function of a linear map with some noise (model given below) but am slightly confused in doing so. At first, I did not realize there were two ...
0
votes
2answers
69 views

Why are the basis functions for DFT so?

When you get a DFT of a signal, you use the basis functions as: $e^{-j2\pi kn/N}$ Why is it so? Why don't we use the conjugate, $e^{j2\pi kn/N}$, or any other function?
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2answers
104 views

DFT of real sinusoids - why sum over -$N/2$ to $N/2-1$ as opposed to $0$ to $N-1$?

I'm going through a Coursera course on signal processing, and we're just introduced to DFTs. We are told that if you have a complex sinusoidal signal $x[n]$ where $n=0,1...\ N-1$, its DFT is given ...
0
votes
1answer
39 views

How many non-zeros samples in convolution

If I have $b[n]$ of length 30 (30 non-zero samples) and $c[n]$ of length 40 (40 non-zero samples). How many non-zero samples will $a[n]=b[n] * c[n]$ have? (Note '$*$' is a convolution). I think ...
0
votes
3answers
38 views

Phase shifting a noisy signal

I have a signal of the form $s(t)=A(t) \sum \cos(\omega_i(t)t +\phi_0) + n(t)$, where $n$ is gaussian noise. I can only read the signal+noise and thus can not separate them. I want to phase shift ...
0
votes
0answers
28 views

Wavelets vs FFT based spectrogram for RF signal identification/analysis

What are the advantages / disadvantages of using a Wavelet based spectrogram vs an FFT based spectrogram (as shown by Baudline, for example) for RF signal analysis / identification ? This paper seems ...
0
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0answers
23 views

Approximation of Step Response from Data with delay

How can I approximate a Step Response curve from a measured data of a single input and a single output using Matlab while the delay between the input and the output is 30 minutes?
0
votes
1answer
28 views

How to measure noise, consonance, dissonance of a sound?

How can I make a graph of the noisiness of some audio durations of 100ms - 10s with 100% being white noise and 0% being a sine wave. I have FFT at the moment, are there other ways to know the ...
2
votes
0answers
35 views

Is GNU Radio a good choice still? [closed]

I'm a newbie at DSP. I am starting a hobbyist project where I plan to monitor 100's of wildlife radio collar frequencies (at my job) and record how many "beeps" per minute are received. My software ...
0
votes
3answers
73 views

Determine whether a signal is increasing or decreasing over time

I have a signal (x-axis: Time, y-axis: Data) which has more than 10000 samples per second. The signal itself represents some physical data (e.g. speed, acceleration, etc.) and has some noise on it. ...
0
votes
0answers
19 views

Help Understanding Time of Flight Phase Sanitization Algorithm

I'm implementing the technique found in this paper: http://front.sjtu.edu.cn/~jinyh/gradCourse/Paper/Wireless/SpotFi%20Decimeter%20Level%20Localization%20Using%20WiFi.pdf to perform localization. ...
1
vote
2answers
67 views

Causal system, order of numerator and denominator [duplicate]

Is it true that if the order of numerator of a system function is larger than its denominator, then we can say that the system is causal? (Without finding R.O.C.) Is there similar thing for ...
0
votes
2answers
52 views

Synthesis DFT Filter Bank

I have a DFT bank analyzer with N channels, but the the bandwidth of the signal occupies only the first 2 channels, therefore I'll reconstruct only these and not entire full bandwidth. I'd like to ...
-1
votes
4answers
95 views

What is the real difference between DSP and AI/data science?

I am very much into DSP, but lately everybody is talking about "Data science" and ...
2
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2answers
93 views

Detecting outliers/noise from sensor data

I am trying to detect outliers/noise as indicated on the diagram below from sensor data. Can anyone advice how to go about it? I can only do this in python, so are there libraries in python that I can ...
0
votes
0answers
35 views

Average Asynchronous Resample Latency

Given a sample frequence of 1 Hz and periodic events. The latency of an event is the time difference to the next sampling point. What is the average latency over infinitely many events? Events are ...
0
votes
0answers
24 views

mixture of a signal with two uncorrelated noise

What happens when we mix a signal (0, 1) with two different uncorrelated gaussian noise? Are the two mixture correlated or uncorrelated? An example will be appreciated.
1
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0answers
58 views

Sampling and zero crossing

I am sampling a sine wave of 50Hz(stepped down from 230V) at the rate of 500KHz. For identifying disturbances in the wave, i was thinking of comparing a cycle of incoming sine values with reference ...